Brainwallet - JavaScript Client-Side Bitcoin Address Generator

BTM on Brainwallet - JavaScript Client-Side Bitcoin Address Generator

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Brainwallet - JavaScript Client-Side Bitcoin Address Generator

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Brainwallet - JavaScript Client-Side Bitcoin Address Generator

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Generating a Bitcoin Address with JavaScript

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Generating a Bitcoin Address with JavaScript

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Generating a Bitcoin Address with JavaScript

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Bitcoin Newcomers FAQ - Please read!

Welcome to the /Bitcoin Sticky FAQ

You've probably been hearing a lot about Bitcoin recently and are wondering what's the big deal? Most of your questions should be answered by the resources below but if you have additional questions feel free to ask them in the comments.
It all started with the release of the release of Satoshi Nakamoto's whitepaper however that will probably go over the head of most readers so we recommend the following videos for a good starting point for understanding how bitcoin works and a little about its long term potential:
Some other great resources include Lopp.net, the Princeton crypto series and James D'Angelo's Bitcoin 101 Blackboard series.
Some excellent writing on Bitcoin's value proposition and future can be found at the Satoshi Nakamoto Institute.
Some Bitcoin statistics can be found here and here. Developer resources can be found here. Peer-reviewed research papers can be found here.
Potential upcoming protocol improvements and scaling resources here and here.
The number of times Bitcoin was declared dead by the media can be found here (LOL!)

Key properties of Bitcoin

Where can I buy bitcoins?

Bitcoin.org and BuyBitcoinWorldwide.com are helpful sites for beginners. You can buy or sell any amount of bitcoin (even just a few dollars worth) and there are several easy methods to purchase bitcoin with cash, credit card or bank transfer. Some of the more popular resources are below, also check out the bitcoinity exchange resources for a larger list of options for purchases.
Here is a listing of local ATMs. If you would like your paycheck automatically converted to bitcoin use Bitwage.
Note: Bitcoins are valued at whatever market price people are willing to pay for them in balancing act of supply vs demand. Unlike traditional markets, bitcoin markets operate 24 hours per day, 365 days per year. Preev is a useful site that that shows how much various denominations of bitcoin are worth in different currencies. Alternatively you can just Google "1 bitcoin in (your local currency)".

Securing your bitcoins

With bitcoin you can "Be your own bank" and personally secure your bitcoins OR you can use third party companies aka "Bitcoin banks" which will hold the bitcoins for you.
Note: For increased security, use Two Factor Authentication (2FA) everywhere it is offered, including email!
2FA requires a second confirmation code to access your account making it much harder for thieves to gain access. Google Authenticator and Authy are the two most popular 2FA services, download links are below. Make sure you create backups of your 2FA codes.
Google Auth Authy OTP Auth
Android Android N/A
iOS iOS iOS

Watch out for scams

As mentioned above, Bitcoin is decentralized, which by definition means there is no official website or Twitter handle or spokesperson or CEO. However, all money attracts thieves. This combination unfortunately results in scammers running official sounding names or pretending to be an authority on YouTube or social media. Many scammers throughout the years have claimed to be the inventor of Bitcoin. Websites like bitcoin(dot)com and the btc subreddit are active scams. Almost all altcoins (shitcoins) are marketed heavily with big promises but are really just designed to separate you from your bitcoin. So be careful: any resource, including all linked in this document, may in the future turn evil. Don't trust, verify. Also as they say in our community "Not your keys, not your coins".

Where can I spend bitcoins?

Check out spendabit or bitcoin directory for millions of merchant options. Also you can spend bitcoin anywhere visa is accepted with bitcoin debit cards such as the CashApp card. Some other useful site are listed below.
Store Product
Gyft Gift cards for hundreds of retailers including Amazon, Target, Walmart, Starbucks, Whole Foods, CVS, Lowes, Home Depot, iTunes, Best Buy, Sears, Kohls, eBay, GameStop, etc.
Spendabit, Overstock and The Bitcoin Directory Retail shopping with millions of results
ShakePay Generate one time use Visa cards in seconds
NewEgg and Dell For all your electronics needs
Bitwa.la, Coinbills, Piixpay, Bitbill.eu, Bylls, Coins.ph, Bitrefill, LivingRoomofSatoshi, Coinsfer, and more Bill payment
Menufy, Takeaway and Thuisbezorgd NL Takeout delivered to your door
Expedia, Cheapair, Destinia, Abitsky, SkyTours, the Travel category on Gyft and 9flats For when you need to get away
Cryptostorm, Mullvad, and PIA VPN services
Namecheap, Porkbun Domain name registration
Stampnik Discounted USPS Priority, Express, First-Class mail postage
Coinmap and AirBitz are helpful to find local businesses accepting bitcoins. A good resource for UK residents is at wheretospendbitcoins.co.uk.
There are also lots of charities which accept bitcoin donations.

Merchant Resources

There are several benefits to accepting bitcoin as a payment option if you are a merchant;
If you are interested in accepting bitcoin as a payment method, there are several options available;

Can I mine bitcoin?

Mining bitcoins can be a fun learning experience, but be aware that you will most likely operate at a loss. Newcomers are often advised to stay away from mining unless they are only interested in it as a hobby similar to folding at home. If you want to learn more about mining you can read more here. Still have mining questions? The crew at /BitcoinMining would be happy to help you out.
If you want to contribute to the bitcoin network by hosting the blockchain and propagating transactions you can run a full node using this setup guide. If you would prefer to keep it simple there are several good options. You can view the global node distribution here.

Earning bitcoins

Just like any other form of money, you can also earn bitcoins by being paid to do a job.
Site Description
WorkingForBitcoins, Bitwage, Cryptogrind, Coinality, Bitgigs, /Jobs4Bitcoins, BitforTip, Rein Project Freelancing
Lolli Earn bitcoin when you shop online!
OpenBazaar, Purse.io, Bitify, /Bitmarket, 21 Market Marketplaces
/GirlsGoneBitcoin NSFW Adult services
A-ads, Coinzilla.io Advertising
You can also earn bitcoins by participating as a market maker on JoinMarket by allowing users to perform CoinJoin transactions with your bitcoins for a small fee (requires you to already have some bitcoins.

Bitcoin-Related Projects

The following is a short list of ongoing projects that might be worth taking a look at if you are interested in current development in the bitcoin space.
Project Description
Lightning Network Second layer scaling
Blockstream, Rootstock and Drivechain Sidechains
Hivemind and Augur Prediction markets
Tierion and Factom Records & Titles on the blockchain
BitMarkets, DropZone, Beaver and Open Bazaar Decentralized markets
JoinMarket and Wasabi Wallet CoinJoin implementation
Coinffeine and Bisq Decentralized bitcoin exchanges
Keybase Identity & Reputation management
Abra Global P2P money transmitter network
Bitcore Open source Bitcoin javascript library

Bitcoin Units

One Bitcoin is quite large (hundreds of £/$/€) so people often deal in smaller units. The most common subunits are listed below:
Unit Symbol Value Info
bitcoin BTC 1 bitcoin one bitcoin is equal to 100 million satoshis
millibitcoin mBTC 1,000 per bitcoin used as default unit in recent Electrum wallet releases
bit bit 1,000,000 per bitcoin colloquial "slang" term for microbitcoin (μBTC)
satoshi sat 100,000,000 per bitcoin smallest unit in bitcoin, named after the inventor
For example, assuming an arbitrary exchange rate of $10000 for one Bitcoin, a $10 meal would equal:
For more information check out the Bitcoin units wiki.
Still have questions? Feel free to ask in the comments below or stick around for our weekly Mentor Monday thread. If you decide to post a question in /Bitcoin, please use the search bar to see if it has been answered before, and remember to follow the community rules outlined on the sidebar to receive a better response. The mods are busy helping manage our community so please do not message them unless you notice problems with the functionality of the subreddit.
Note: This is a community created FAQ. If you notice anything missing from the FAQ or that requires clarification you can edit it here and it will be included in the next revision pending approval.
Welcome to the Bitcoin community and the new decentralized economy!
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What I currently use for privacy (after almost 2 years of long investing into it)

First of all, my threat model: I'm just an average person that wants to AVOID the maximum I can to be monitored and tracked by the government and big corps, a lot of people out there REALLY hate me and I've gone through lots of harassment and other stuff, I also plan to take my activism and love for freedom more seriously and to do stuff that could potentially lead me to very high danger or even put my life on the line. That being said, my main focus is on something that is privacy-friendly but also something with decent security (no point having a lot of privacy if a script kiddie can just break into it an boom, everything is gone) anonymity is also desirable but I'm pretty aware that true 100% anonymity is simply not possible and to achieve the maximum you can of it currently you'd have to give up A LOT of stuff in which I don't think I really could. So basically, everything that I said + I don't want to give up some hobbies of mine (as playing games etc)
Here's what I use/have done so far, most of it is based on privacytools.io list and research I've done.
Mobile:
Google Pixel 3a XL running GrapheneOS
Apps: Stock apps (Vanadium, Gallery, Clock, Contacts etc) + F-DROID, NewPipe, OsmAnd+, Joplin, Tutanota, K-9 Mail, Aegis Authenticator, KeePassDX, Syncthing, Signal, Librera PRO, Vinyl, Open Camera and Wireguard.
I also use BlahDNS as my private DNS.
Other smartphone stuff/habits: I use a Supershieldz Anti Spy Tempered Glass Screen Protector on my phone and I also have a Faraday Sleeve from Silent Pocket which my phone is on most of the times (I don't have smartphone addiction and would likely advice you to break free from smartphone addiction if you have it). I NEVER use bluetooth (thank god Pixel 3a have a headphone jack so yeah, no bluetooth earphones here) and always keep my Wi-Fi off if I'm not using it.
Computer:
I have a desktop that I built (specs: Asus B450M Gaming, AMD Ryzen 3 3300X, Radeon RX 580 8GB, 16GB DDR4 2666Mhz, 3TB HDD, 480GB SSD) that is dualbooted with QubesOS and Arch Linux.
Qubes is my main OS that I use as daily driver and for my tasks, I use Arch for gaming.
I've installed linux-hardened and its headers packages on my Arch + further kernel hardening using systctl and boot parameters, AppArmor as my MAC system and bubblewrap for sandboxing programs. I also spoof my MAC address and have restricted root access, I've also protected my GRUB with password (and use encrypted boot) and have enabled Microcode updates and have NTP and IPV6 disabled.
Also on Arch, I use iptables as a firewall denying all incoming traffic, and since it's my gaming PC, I don't game on the OS, instead, I use a KVM/QEMU Windows VM for gaming (search "How I Built The "Poor-Shamed" Computer" video to see what I'm talking about) I also use full disk encryption.
Software/Providers:
E-Mails: I use ProtonMail (Plus Account paid with bitcoin) and Tutanota (free account as they don't accept crypto payment yet, come on Tutanota, I've been waiting for it for 2 years already) since I have plus account on ProtonMail it allows me to use ProtonMail Bridge and use it on Claws Mail (desktop) and K-9 Mail (mobile) as for Tutanota I use both desktop and mobile app.
Some other e-mails habits of mine: I use e-mail aliases (ProtonMail plus account provides you with 5) and each alias is used for different tasks (as one for shopping, one for banking, one for accounts etc) and none of my e-mails have my real name on it or something that could be used to identify me. I also highly avoid using stuff that require e-mail/e-mail verification for usage (e-mail is such a pain in the ass tbh) I also make use of Spamgourmet for stuff like temporary e-mail (best service I found for this doing my research, dunno if it's really the best tho, heard that AnonAddy does kinda the same stuff but dunno, recommendations are welcomed)
Browsers/Search Engine: As mentioned, I use Vanadium (Graphene's stock browser) on mobile as it is the recommended browser by Graphene and the one with the best security for Android, for desktop I use a Hardened Firefox (pretty aware of Firefox's security not being that good, but it's the best browser for PC for me as Ungoogled Chromium is still not there in A LOT of things + inherent problems of Chrome as not being able to disable WebRTC unless you use an extension etc) with ghacks-user.js and uBlock Origin (hard mode), uMatrix (globally blocking first party scripts), HTTPS Everywhere (EASE Mode), Decentraleyes (set the recommended rules for both uBlock Origin and uMatrix) and Temporary Containers as addons. I also use Tor Browser (Safest Mode) on a Whonix VM on Qubes sometimes. DuckDuckGo is my to-go search engine and I use DNS over HTTPS on Firefox (BlahDNS as my provider once again)
browsing habits: I avoid JavaScript the maximum I can, if it's really needed, I just allow the scripts temporarely on uBlock Origin/uMatrix and after I'm done I just disable it. I also generally go with old.reddit.com instead of reddit.com (as JavaScript is not required to browse the old client), nitter.net for checking twitter stuff (although I rarely have something peaking my interest on Twitter) and I use invidious.snopyta.org as youtube front-end (I do however use YouTube sometimes if a video I wanna see can't be played on invidious or if I wanna watch a livestream) and html.duckduckgo.com instead of duckduckgo.com other than avoiding JavaScript most of my browsing habits are just common sense at this point I'd say, I also use privatebin (snopyta's instance) instead of pastebin. I also have multiple firefox profiles for different tasks (personal usage, shopping, banking etc)
VPN: I use Mullvad (guess you can mention it here since it's PTIO's recommended) paid with bitcoin and honestly best service available tbh. I use Mullvad's multihop implementation on Wireguard which I manually set myself as I had the time and patience to learn how.
password manager: KeePassXC on desktop and KeePassDX on my smartphone, my password database for my desktop is stored on a USB flash driver I encrypted with VeraCrypt.
some other software on desktop: LibreOffice (as a Microsoft Office substitute), GIMP (Photshop substitute), Vim (I use it for multiple purposes, mainly coding IDE and as a text editor), VLC (media player), Bisq (bitcoin exchange), Wasabi (bitcoin wallet), OBS (screen recording), Syncthing (file sync), qBitTorrent (torrent client) and Element (federated real-time communication software). I sadly couldn't find a good open-source substitute to Sony Vegas (tested many, but none was in the same level of Vegas imo, KDENLive is okay tho) so I just use it on a VM if I need it (Windows VM solely for the purpose of video editing, not the same one I use for gaming)
Other:
router: I have an Asus RT-AC68U with OpenWRT as its firmware. I also set a VPN on it.
cryptocurrency hardware wallet: I store all of my cryptocurrency (Bitcoin and Monero) on a Ledger Nano S, about 97% of my money is on crypto so a hardware wallet is a must for me.
I have lots of USB flash drivers that I use for Live ISOs and for encrypted backups. I also have a USB Data Blocker from PortaPow that I generally use if I need to charge my cellphone in public or in a hotel while on a trip (rare occasion tbh).
I have a Logitech C920e as webcam and a Blue Yeti microphone in which I never let them plugged, I only plug them if it's necessary and after I'm done I just unplug them.
I also have a Nintendo Switch Lite as a gaming console that I most of the times just use offline, I just connect to the internet if needed for a software update and then just turn the Wi-Fi off from it.
Other Habits/Things I've done:
payments: I simply AVOID using credit card, I try to always pay on cash (I live in a third-world country so thank god most of people here still depend on cash only) physically and online I try my best to either by using cryptocurrency or using gift cards/cash by mail if crypto isn't available. I usually buy crypto on Bisq as I just don't trust any KYC exchange (and neither should you) and since there aren't many people here in my area to do face to face bitcoin trade (and I'm skeptical of face to face tbh), I use the Wasabi Wallet (desktop) to coinjoin bitcoin before buying anything as this allows a bit more of privacy, I also coinjoin on Wasabi before sending my bitcoins to my hardware wallet. I also don't have a high consumerism drive so I'm not constantly wanting to buy everything that I see (which helps a lot on this criteria)
social media/accounts: as noted, aside from Signal and Element (which I don't even use that often) I just don't REALLY use any social media (tried Mastodon for a while but I was honestly felt it kinda desert there and most of its userbase from what I've seen were some people I'd just... rather don't hang with tbh) and, althoug not something necessary is something that I really advise people to as social media is literally a poison to your mind.
I also don't own any streaming service like Netflix/Amazon Prime/Spotify etc, I basically pirate series/movies/songs and that's it.
I've also deleted ALL my old accounts from social media (like Twitter etc) and old e-mails. ALL of my important and main accounts have 2FA enabled and are protected by a strong password (I use KeePass to generate a 35 character lenght password with numbers, capital letters, special symbols etc, each account uses a unique password) I also NEVER use my real name on any account and NEVER post any pictures of myself (I rarely take pictures of stuff if anything)
iot/smart devices: aside from my smartphone, I don't have any IOT/smart device as I honestly see no need for them (and most of them are WAY too expensive on third-world countries)
files: I constatly backup all of my files (each two weeks) on encrypted flash drivers, I also use BleachBit for temporary data cleaning and data/file shredding. I also use Syncthing as a substitute to stuff like Google Drive.
Future plans:
learn to self-host and self-host an e-mail/NextCloud (and maybe even a VPN)
find something like BurneHushed but FOSS (if you know any please let me know)
So, how is it? anything that I should do that I'm probably not doing?
submitted by StunningDistrust to privacytoolsIO [link] [comments]

Best option for generating a wallet on debian?

I'm keeping the private key offline and really just using to dump ETH from coinbase and hold for years. I started out printing a paper wallet, but over in /bitcoin, they really don't like paper wallets or address reuse. So now I've got an Electrum wallet for bitcoin that generates addresses and I guess I'm supposed to dump my coinbase coins to a new one each time I buy, and it's kind of a convoluted mess that I'm still working out.
It looks like most of my options for Ethereum, though are javascript-based paper wallets. It also seems like the Ethereum community isn't nearly as worried about address reuse, and change addresses don't really exist within Ethereum?
Is it reasonable to just generate a MEW wallet on an airgapped machine and send my coinbase Ethereum to the same address every time if I'm planning on holding it for years?
Edit: Looks like MyCrypto will actually be the way to go.
submitted by PrettyLadiesAreGreat to ethereum [link] [comments]

Why i’m bullish on Zilliqa (long read)

Edit: TL;DR added in the comments
 
Hey all, I've been researching coins since 2017 and have gone through 100s of them in the last 3 years. I got introduced to blockchain via Bitcoin of course, analyzed Ethereum thereafter and from that moment I have a keen interest in smart contact platforms. I’m passionate about Ethereum but I find Zilliqa to have a better risk-reward ratio. Especially because Zilliqa has found an elegant balance between being secure, decentralized and scalable in my opinion.
 
Below I post my analysis of why from all the coins I went through I’m most bullish on Zilliqa (yes I went through Tezos, EOS, NEO, VeChain, Harmony, Algorand, Cardano etc.). Note that this is not investment advice and although it's a thorough analysis there is obviously some bias involved. Looking forward to what you all think!
 
Fun fact: the name Zilliqa is a play on ‘silica’ silicon dioxide which means “Silicon for the high-throughput consensus computer.”
 
This post is divided into (i) Technology, (ii) Business & Partnerships, and (iii) Marketing & Community. I’ve tried to make the technology part readable for a broad audience. If you’ve ever tried understanding the inner workings of Bitcoin and Ethereum you should be able to grasp most parts. Otherwise, just skim through and once you are zoning out head to the next part.
 
Technology and some more:
 
Introduction
 
The technology is one of the main reasons why I’m so bullish on Zilliqa. First thing you see on their website is: “Zilliqa is a high-performance, high-security blockchain platform for enterprises and next-generation applications.” These are some bold statements.
 
Before we deep dive into the technology let’s take a step back in time first as they have quite the history. The initial research paper from which Zilliqa originated dates back to August 2016: Elastico: A Secure Sharding Protocol For Open Blockchains where Loi Luu (Kyber Network) is one of the co-authors. Other ideas that led to the development of what Zilliqa has become today are: Bitcoin-NG, collective signing CoSi, ByzCoin and Omniledger.
 
The technical white paper was made public in August 2017 and since then they have achieved everything stated in the white paper and also created their own open source intermediate level smart contract language called Scilla (functional programming language similar to OCaml) too.
 
Mainnet is live since the end of January 2019 with daily transaction rates growing continuously. About a week ago mainnet reached 5 million transactions, 500.000+ addresses in total along with 2400 nodes keeping the network decentralized and secure. Circulating supply is nearing 11 billion and currently only mining rewards are left. The maximum supply is 21 billion with annual inflation being 7.13% currently and will only decrease with time.
 
Zilliqa realized early on that the usage of public cryptocurrencies and smart contracts were increasing but decentralized, secure, and scalable alternatives were lacking in the crypto space. They proposed to apply sharding onto a public smart contract blockchain where the transaction rate increases almost linear with the increase in the amount of nodes. More nodes = higher transaction throughput and increased decentralization. Sharding comes in many forms and Zilliqa uses network-, transaction- and computational sharding. Network sharding opens up the possibility of using transaction- and computational sharding on top. Zilliqa does not use state sharding for now. We’ll come back to this later.
 
Before we continue dissecting how Zilliqa achieves such from a technological standpoint it’s good to keep in mind that a blockchain being decentralised and secure and scalable is still one of the main hurdles in allowing widespread usage of decentralised networks. In my opinion this needs to be solved first before blockchains can get to the point where they can create and add large scale value. So I invite you to read the next section to grasp the underlying fundamentals. Because after all these premises need to be true otherwise there isn’t a fundamental case to be bullish on Zilliqa, right?
 
Down the rabbit hole
 
How have they achieved this? Let’s define the basics first: key players on Zilliqa are the users and the miners. A user is anybody who uses the blockchain to transfer funds or run smart contracts. Miners are the (shard) nodes in the network who run the consensus protocol and get rewarded for their service in Zillings (ZIL). The mining network is divided into several smaller networks called shards, which is also referred to as ‘network sharding’. Miners subsequently are randomly assigned to a shard by another set of miners called DS (Directory Service) nodes. The regular shards process transactions and the outputs of these shards are eventually combined by the DS shard as they reach consensus on the final state. More on how these DS shards reach consensus (via pBFT) will be explained later on.
 
The Zilliqa network produces two types of blocks: DS blocks and Tx blocks. One DS Block consists of 100 Tx Blocks. And as previously mentioned there are two types of nodes concerned with reaching consensus: shard nodes and DS nodes. Becoming a shard node or DS node is being defined by the result of a PoW cycle (Ethash) at the beginning of the DS Block. All candidate mining nodes compete with each other and run the PoW (Proof-of-Work) cycle for 60 seconds and the submissions achieving the highest difficulty will be allowed on the network. And to put it in perspective: the average difficulty for one DS node is ~ 2 Th/s equaling 2.000.000 Mh/s or 55 thousand+ GeForce GTX 1070 / 8 GB GPUs at 35.4 Mh/s. Each DS Block 10 new DS nodes are allowed. And a shard node needs to provide around 8.53 GH/s currently (around 240 GTX 1070s). Dual mining ETH/ETC and ZIL is possible and can be done via mining software such as Phoenix and Claymore. There are pools and if you have large amounts of hashing power (Ethash) available you could mine solo.
 
The PoW cycle of 60 seconds is a peak performance and acts as an entry ticket to the network. The entry ticket is called a sybil resistance mechanism and makes it incredibly hard for adversaries to spawn lots of identities and manipulate the network with these identities. And after every 100 Tx Blocks which corresponds to roughly 1,5 hour this PoW process repeats. In between these 1,5 hour, no PoW needs to be done meaning Zilliqa’s energy consumption to keep the network secure is low. For more detailed information on how mining works click here.
Okay, hats off to you. You have made it this far. Before we go any deeper down the rabbit hole we first must understand why Zilliqa goes through all of the above technicalities and understand a bit more what a blockchain on a more fundamental level is. Because the core of Zilliqa’s consensus protocol relies on the usage of pBFT (practical Byzantine Fault Tolerance) we need to know more about state machines and their function. Navigate to Viewblock, a Zilliqa block explorer, and just come back to this article. We will use this site to navigate through a few concepts.
 
We have established that Zilliqa is a public and distributed blockchain. Meaning that everyone with an internet connection can send ZILs, trigger smart contracts, etc. and there is no central authority who fully controls the network. Zilliqa and other public and distributed blockchains (like Bitcoin and Ethereum) can also be defined as state machines.
 
Taking the liberty of paraphrasing examples and definitions given by Samuel Brooks’ medium article, he describes the definition of a blockchain (like Zilliqa) as: “A peer-to-peer, append-only datastore that uses consensus to synchronize cryptographically-secure data”.
 
Next, he states that: "blockchains are fundamentally systems for managing valid state transitions”. For some more context, I recommend reading the whole medium article to get a better grasp of the definitions and understanding of state machines. Nevertheless, let’s try to simplify and compile it into a single paragraph. Take traffic lights as an example: all its states (red, amber, and green) are predefined, all possible outcomes are known and it doesn’t matter if you encounter the traffic light today or tomorrow. It will still behave the same. Managing the states of a traffic light can be done by triggering a sensor on the road or pushing a button resulting in one traffic lights’ state going from green to red (via amber) and another light from red to green.
 
With public blockchains like Zilliqa, this isn’t so straightforward and simple. It started with block #1 almost 1,5 years ago and every 45 seconds or so a new block linked to the previous block is being added. Resulting in a chain of blocks with transactions in it that everyone can verify from block #1 to the current #647.000+ block. The state is ever changing and the states it can find itself in are infinite. And while the traffic light might work together in tandem with various other traffic lights, it’s rather insignificant comparing it to a public blockchain. Because Zilliqa consists of 2400 nodes who need to work together to achieve consensus on what the latest valid state is while some of these nodes may have latency or broadcast issues, drop offline or are deliberately trying to attack the network, etc.
 
Now go back to the Viewblock page take a look at the amount of transaction, addresses, block and DS height and then hit refresh. Obviously as expected you see new incremented values on one or all parameters. And how did the Zilliqa blockchain manage to transition from a previous valid state to the latest valid state? By using pBFT to reach consensus on the latest valid state.
 
After having obtained the entry ticket, miners execute pBFT to reach consensus on the ever-changing state of the blockchain. pBFT requires a series of network communication between nodes, and as such there is no GPU involved (but CPU). Resulting in the total energy consumed to keep the blockchain secure, decentralized and scalable being low.
 
pBFT stands for practical Byzantine Fault Tolerance and is an optimization on the Byzantine Fault Tolerant algorithm. To quote Blockonomi: “In the context of distributed systems, Byzantine Fault Tolerance is the ability of a distributed computer network to function as desired and correctly reach a sufficient consensus despite malicious components (nodes) of the system failing or propagating incorrect information to other peers.” Zilliqa is such a distributed computer network and depends on the honesty of the nodes (shard and DS) to reach consensus and to continuously update the state with the latest block. If pBFT is a new term for you I can highly recommend the Blockonomi article.
 
The idea of pBFT was introduced in 1999 - one of the authors even won a Turing award for it - and it is well researched and applied in various blockchains and distributed systems nowadays. If you want more advanced information than the Blockonomi link provides click here. And if you’re in between Blockonomi and the University of Singapore read the Zilliqa Design Story Part 2 dating from October 2017.
Quoting from the Zilliqa tech whitepaper: “pBFT relies upon a correct leader (which is randomly selected) to begin each phase and proceed when the sufficient majority exists. In case the leader is byzantine it can stall the entire consensus protocol. To address this challenge, pBFT offers a view change protocol to replace the byzantine leader with another one.”
 
pBFT can tolerate ⅓ of the nodes being dishonest (offline counts as Byzantine = dishonest) and the consensus protocol will function without stalling or hiccups. Once there are more than ⅓ of dishonest nodes but no more than ⅔ the network will be stalled and a view change will be triggered to elect a new DS leader. Only when more than ⅔ of the nodes are dishonest (66%) double-spend attacks become possible.
 
If the network stalls no transactions can be processed and one has to wait until a new honest leader has been elected. When the mainnet was just launched and in its early phases, view changes happened regularly. As of today the last stalling of the network - and view change being triggered - was at the end of October 2019.
 
Another benefit of using pBFT for consensus besides low energy is the immediate finality it provides. Once your transaction is included in a block and the block is added to the chain it’s done. Lastly, take a look at this article where three types of finality are being defined: probabilistic, absolute and economic finality. Zilliqa falls under the absolute finality (just like Tendermint for example). Although lengthy already we skipped through some of the inner workings from Zilliqa’s consensus: read the Zilliqa Design Story Part 3 and you will be close to having a complete picture on it. Enough about PoW, sybil resistance mechanism, pBFT, etc. Another thing we haven’t looked at yet is the amount of decentralization.
 
Decentralisation
 
Currently, there are four shards, each one of them consisting of 600 nodes. 1 shard with 600 so-called DS nodes (Directory Service - they need to achieve a higher difficulty than shard nodes) and 1800 shard nodes of which 250 are shard guards (centralized nodes controlled by the team). The amount of shard guards has been steadily declining from 1200 in January 2019 to 250 as of May 2020. On the Viewblock statistics, you can see that many of the nodes are being located in the US but those are only the (CPU parts of the) shard nodes who perform pBFT. There is no data from where the PoW sources are coming. And when the Zilliqa blockchain starts reaching its transaction capacity limit, a network upgrade needs to be executed to lift the current cap of maximum 2400 nodes to allow more nodes and formation of more shards which will allow to network to keep on scaling according to demand.
Besides shard nodes there are also seed nodes. The main role of seed nodes is to serve as direct access points (for end-users and clients) to the core Zilliqa network that validates transactions. Seed nodes consolidate transaction requests and forward these to the lookup nodes (another type of nodes) for distribution to the shards in the network. Seed nodes also maintain the entire transaction history and the global state of the blockchain which is needed to provide services such as block explorers. Seed nodes in the Zilliqa network are comparable to Infura on Ethereum.
 
The seed nodes were first only operated by Zilliqa themselves, exchanges and Viewblock. Operators of seed nodes like exchanges had no incentive to open them for the greater public. They were centralised at first. Decentralisation at the seed nodes level has been steadily rolled out since March 2020 ( Zilliqa Improvement Proposal 3 ). Currently the amount of seed nodes is being increased, they are public-facing and at the same time PoS is applied to incentivize seed node operators and make it possible for ZIL holders to stake and earn passive yields. Important distinction: seed nodes are not involved with consensus! That is still PoW as entry ticket and pBFT for the actual consensus.
 
5% of the block rewards are being assigned to seed nodes (from the beginning in 2019) and those are being used to pay out ZIL stakers. The 5% block rewards with an annual yield of 10.03% translate to roughly 610 MM ZILs in total that can be staked. Exchanges use the custodial variant of staking and wallets like Moonlet will use the non-custodial version (starting in Q3 2020). Staking is being done by sending ZILs to a smart contract created by Zilliqa and audited by Quantstamp.
 
With a high amount of DS; shard nodes and seed nodes becoming more decentralized too, Zilliqa qualifies for the label of decentralized in my opinion.
 
Smart contracts
 
Let me start by saying I’m not a developer and my programming skills are quite limited. So I‘m taking the ELI5 route (maybe 12) but if you are familiar with Javascript, Solidity or specifically OCaml please head straight to Scilla - read the docs to get a good initial grasp of how Zilliqa’s smart contract language Scilla works and if you ask yourself “why another programming language?” check this article. And if you want to play around with some sample contracts in an IDE click here. The faucet can be found here. And more information on architecture, dapp development and API can be found on the Developer Portal.
If you are more into listening and watching: check this recent webinar explaining Zilliqa and Scilla. Link is time-stamped so you’ll start right away with a platform introduction, roadmap 2020 and afterwards a proper Scilla introduction.
 
Generalized: programming languages can be divided into being ‘object-oriented’ or ‘functional’. Here is an ELI5 given by software development academy: * “all programs have two basic components, data – what the program knows – and behavior – what the program can do with that data. So object-oriented programming states that combining data and related behaviors in one place, is called “object”, which makes it easier to understand how a particular program works. On the other hand, functional programming argues that data and behavior are different things and should be separated to ensure their clarity.” *
 
Scilla is on the functional side and shares similarities with OCaml: OCaml is a general-purpose programming language with an emphasis on expressiveness and safety. It has an advanced type system that helps catch your mistakes without getting in your way. It's used in environments where a single mistake can cost millions and speed matters, is supported by an active community, and has a rich set of libraries and development tools. For all its power, OCaml is also pretty simple, which is one reason it's often used as a teaching language.
 
Scilla is blockchain agnostic, can be implemented onto other blockchains as well, is recognized by academics and won a so-called Distinguished Artifact Award award at the end of last year.
 
One of the reasons why the Zilliqa team decided to create their own programming language focused on preventing smart contract vulnerabilities is that adding logic on a blockchain, programming, means that you cannot afford to make mistakes. Otherwise, it could cost you. It’s all great and fun blockchains being immutable but updating your code because you found a bug isn’t the same as with a regular web application for example. And with smart contracts, it inherently involves cryptocurrencies in some form thus value.
 
Another difference with programming languages on a blockchain is gas. Every transaction you do on a smart contract platform like Zilliqa or Ethereum costs gas. With gas you basically pay for computational costs. Sending a ZIL from address A to address B costs 0.001 ZIL currently. Smart contracts are more complex, often involve various functions and require more gas (if gas is a new concept click here ).
 
So with Scilla, similar to Solidity, you need to make sure that “every function in your smart contract will run as expected without hitting gas limits. An improper resource analysis may lead to situations where funds may get stuck simply because a part of the smart contract code cannot be executed due to gas limits. Such constraints are not present in traditional software systems”. Scilla design story part 1
 
Some examples of smart contract issues you’d want to avoid are: leaking funds, ‘unexpected changes to critical state variables’ (example: someone other than you setting his or her address as the owner of the smart contract after creation) or simply killing a contract.
 
Scilla also allows for formal verification. Wikipedia to the rescue: In the context of hardware and software systems, formal verification is the act of proving or disproving the correctness of intended algorithms underlying a system with respect to a certain formal specification or property, using formal methods of mathematics.
 
Formal verification can be helpful in proving the correctness of systems such as: cryptographic protocols, combinational circuits, digital circuits with internal memory, and software expressed as source code.
 
Scilla is being developed hand-in-hand with formalization of its semantics and its embedding into the Coq proof assistant — a state-of-the art tool for mechanized proofs about properties of programs.”
 
Simply put, with Scilla and accompanying tooling developers can be mathematically sure and proof that the smart contract they’ve written does what he or she intends it to do.
 
Smart contract on a sharded environment and state sharding
 
There is one more topic I’d like to touch on: smart contract execution in a sharded environment (and what is the effect of state sharding). This is a complex topic. I’m not able to explain it any easier than what is posted here. But I will try to compress the post into something easy to digest.
 
Earlier on we have established that Zilliqa can process transactions in parallel due to network sharding. This is where the linear scalability comes from. We can define simple transactions: a transaction from address A to B (Category 1), a transaction where a user interacts with one smart contract (Category 2) and the most complex ones where triggering a transaction results in multiple smart contracts being involved (Category 3). The shards are able to process transactions on their own without interference of the other shards. With Category 1 transactions that is doable, with Category 2 transactions sometimes if that address is in the same shard as the smart contract but with Category 3 you definitely need communication between the shards. Solving that requires to make a set of communication rules the protocol needs to follow in order to process all transactions in a generalised fashion.
 
And this is where the downsides of state sharding comes in currently. All shards in Zilliqa have access to the complete state. Yes the state size (0.1 GB at the moment) grows and all of the nodes need to store it but it also means that they don’t need to shop around for information available on other shards. Requiring more communication and adding more complexity. Computer science knowledge and/or developer knowledge required links if you want to dig further: Scilla - language grammar Scilla - Foundations for Verifiable Decentralised Computations on a Blockchain Gas Accounting NUS x Zilliqa: Smart contract language workshop
 
Easier to follow links on programming Scilla https://learnscilla.com/home Ivan on Tech
 
Roadmap / Zilliqa 2.0
 
There is no strict defined roadmap but here are topics being worked on. And via the Zilliqa website there is also more information on the projects they are working on.
 
Business & Partnerships
 
It’s not only technology in which Zilliqa seems to be excelling as their ecosystem has been expanding and starting to grow rapidly. The project is on a mission to provide OpenFinance (OpFi) to the world and Singapore is the right place to be due to its progressive regulations and futuristic thinking. Singapore has taken a proactive approach towards cryptocurrencies by introducing the Payment Services Act 2019 (PS Act). Among other things, the PS Act will regulate intermediaries dealing with certain cryptocurrencies, with a particular focus on consumer protection and anti-money laundering. It will also provide a stable regulatory licensing and operating framework for cryptocurrency entities, effectively covering all crypto businesses and exchanges based in Singapore. According to PWC 82% of the surveyed executives in Singapore reported blockchain initiatives underway and 13% of them have already brought the initiatives live to the market. There is also an increasing list of organizations that are starting to provide digital payment services. Moreover, Singaporean blockchain developers Building Cities Beyond has recently created an innovation $15 million grant to encourage development on its ecosystem. This all suggests that Singapore tries to position itself as (one of) the leading blockchain hubs in the world.
 
Zilliqa seems to already take advantage of this and recently helped launch Hg Exchange on their platform, together with financial institutions PhillipCapital, PrimePartners and Fundnel. Hg Exchange, which is now approved by the Monetary Authority of Singapore (MAS), uses smart contracts to represent digital assets. Through Hg Exchange financial institutions worldwide can use Zilliqa's safe-by-design smart contracts to enable the trading of private equities. For example, think of companies such as Grab, Airbnb, SpaceX that are not available for public trading right now. Hg Exchange will allow investors to buy shares of private companies & unicorns and capture their value before an IPO. Anquan, the main company behind Zilliqa, has also recently announced that they became a partner and shareholder in TEN31 Bank, which is a fully regulated bank allowing for tokenization of assets and is aiming to bridge the gap between conventional banking and the blockchain world. If STOs, the tokenization of assets, and equity trading will continue to increase, then Zilliqa’s public blockchain would be the ideal candidate due to its strategic positioning, partnerships, regulatory compliance and the technology that is being built on top of it.
 
What is also very encouraging is their focus on banking the un(der)banked. They are launching a stablecoin basket starting with XSGD. As many of you know, stablecoins are currently mostly used for trading. However, Zilliqa is actively trying to broaden the use case of stablecoins. I recommend everybody to read this text that Amrit Kumar wrote (one of the co-founders). These stablecoins will be integrated in the traditional markets and bridge the gap between the crypto world and the traditional world. This could potentially revolutionize and legitimise the crypto space if retailers and companies will for example start to use stablecoins for payments or remittances, instead of it solely being used for trading.
 
Zilliqa also released their DeFi strategic roadmap (dating November 2019) which seems to be aligning well with their OpFi strategy. A non-custodial DEX is coming to Zilliqa made by Switcheo which allows cross-chain trading (atomic swaps) between ETH, EOS and ZIL based tokens. They also signed a Memorandum of Understanding for a (soon to be announced) USD stablecoin. And as Zilliqa is all about regulations and being compliant, I’m speculating on it to be a regulated USD stablecoin. Furthermore, XSGD is already created and visible on block explorer and XIDR (Indonesian Stablecoin) is also coming soon via StraitsX. Here also an overview of the Tech Stack for Financial Applications from September 2019. Further quoting Amrit Kumar on this:
 
There are two basic building blocks in DeFi/OpFi though: 1) stablecoins as you need a non-volatile currency to get access to this market and 2) a dex to be able to trade all these financial assets. The rest are built on top of these blocks.
 
So far, together with our partners and community, we have worked on developing these building blocks with XSGD as a stablecoin. We are working on bringing a USD-backed stablecoin as well. We will soon have a decentralised exchange developed by Switcheo. And with HGX going live, we are also venturing into the tokenization space. More to come in the future.”
 
Additionally, they also have this ZILHive initiative that injects capital into projects. There have been already 6 waves of various teams working on infrastructure, innovation and research, and they are not from ASEAN or Singapore only but global: see Grantees breakdown by country. Over 60 project teams from over 20 countries have contributed to Zilliqa's ecosystem. This includes individuals and teams developing wallets, explorers, developer toolkits, smart contract testing frameworks, dapps, etc. As some of you may know, Unstoppable Domains (UD) blew up when they launched on Zilliqa. UD aims to replace cryptocurrency addresses with a human-readable name and allows for uncensorable websites. Zilliqa will probably be the only one able to handle all these transactions onchain due to ability to scale and its resulting low fees which is why the UD team launched this on Zilliqa in the first place. Furthermore, Zilliqa also has a strong emphasis on security, compliance, and privacy, which is why they partnered with companies like Elliptic, ChainSecurity (part of PwC Switzerland), and Incognito. Their sister company Aqilliz (Zilliqa spelled backwards) focuses on revolutionizing the digital advertising space and is doing interesting things like using Zilliqa to track outdoor digital ads with companies like Foodpanda.
 
Zilliqa is listed on nearly all major exchanges, having several different fiat-gateways and recently have been added to Binance’s margin trading and futures trading with really good volume. They also have a very impressive team with good credentials and experience. They don't just have “tech people”. They have a mix of tech people, business people, marketeers, scientists, and more. Naturally, it's good to have a mix of people with different skill sets if you work in the crypto space.
 
Marketing & Community
 
Zilliqa has a very strong community. If you just follow their Twitter their engagement is much higher for a coin that has approximately 80k followers. They also have been ‘coin of the day’ by LunarCrush many times. LunarCrush tracks real-time cryptocurrency value and social data. According to their data, it seems Zilliqa has a more fundamental and deeper understanding of marketing and community engagement than almost all other coins. While almost all coins have been a bit frozen in the last months, Zilliqa seems to be on its own bull run. It was somewhere in the 100s a few months ago and is currently ranked #46 on CoinGecko. Their official Telegram also has over 20k people and is very active, and their community channel which is over 7k now is more active and larger than many other official channels. Their local communities also seem to be growing.
 
Moreover, their community started ‘Zillacracy’ together with the Zilliqa core team ( see www.zillacracy.com ). It’s a community-run initiative where people from all over the world are now helping with marketing and development on Zilliqa. Since its launch in February 2020 they have been doing a lot and will also run their own non-custodial seed node for staking. This seed node will also allow them to start generating revenue for them to become a self sustaining entity that could potentially scale up to become a decentralized company working in parallel with the Zilliqa core team. Comparing it to all the other smart contract platforms (e.g. Cardano, EOS, Tezos etc.) they don't seem to have started a similar initiative (correct me if I’m wrong though). This suggests in my opinion that these other smart contract platforms do not fully understand how to utilize the ‘power of the community’. This is something you cannot ‘buy with money’ and gives many projects in the space a disadvantage.
 
Zilliqa also released two social products called SocialPay and Zeeves. SocialPay allows users to earn ZILs while tweeting with a specific hashtag. They have recently used it in partnership with the Singapore Red Cross for a marketing campaign after their initial pilot program. It seems like a very valuable social product with a good use case. I can see a lot of traditional companies entering the space through this product, which they seem to suggest will happen. Tokenizing hashtags with smart contracts to get network effect is a very smart and innovative idea.
 
Regarding Zeeves, this is a tipping bot for Telegram. They already have 1000s of signups and they plan to keep upgrading it for more and more people to use it (e.g. they recently have added a quiz features). They also use it during AMAs to reward people in real-time. It’s a very smart approach to grow their communities and get familiar with ZIL. I can see this becoming very big on Telegram. This tool suggests, again, that the Zilliqa team has a deeper understanding of what the crypto space and community needs and is good at finding the right innovative tools to grow and scale.
 
To be honest, I haven’t covered everything (i’m also reaching the character limited haha). So many updates happening lately that it's hard to keep up, such as the International Monetary Fund mentioning Zilliqa in their report, custodial and non-custodial Staking, Binance Margin, Futures, Widget, entering the Indian market, and more. The Head of Marketing Colin Miles has also released this as an overview of what is coming next. And last but not least, Vitalik Buterin has been mentioning Zilliqa lately acknowledging Zilliqa and mentioning that both projects have a lot of room to grow. There is much more info of course and a good part of it has been served to you on a silver platter. I invite you to continue researching by yourself :-) And if you have any comments or questions please post here!
submitted by haveyouheardaboutit to CryptoCurrency [link] [comments]

Single-address website-generated "Paper wallets" are bad and dangerous, and should not be used

Single-address website-generated submitted by belcher_ to Bitcoin [link] [comments]

BitcoinBCH.com accidentally publishes on-chain proof that they fake BCHs adoption metrics. Post to r/btc gets deleted and OP is now permanently banned.

Everybody who has posted this on btc has been banned according to modlog. Total of 9 users so far. Don't post this on btc or you will get banned. If you get banned comment on this thread or PM me.

May 2020:

According to btc modlogs, mc-78 has been banned because he questioned the April report with this comment.

According to btc modlogs, BCH4TW has been banned because he questioned the April report with this comment.

March 2020:

According to btc modlogs, bch4god has been banned because he questioned the February report with this comment.

According to btc modlogs, ISeeGregPeople has been banned because he linked to this thread in his comment.

February 2020:

According to btc modlogs, whene-is-satoshi has been banned because he linked to this thread in his comment.

January 2020:

According to btc modlogs, cryptokittykiller's post has been removed for linking to this thread.

According to btc modlogs, bashcalf has now been banned for linking to this thread.

According to btc modlogs, EnterLayer2 has now been banned for this post pointing out that this thread has reached 1000 upvotes.

This article was posted by bitcoinsatellite on btc here. Once it reached frontpage it got deleted and OP was banned from btc and bitcoincash as a result.

Disclaimer: I am not and have never been affiliated with any of the mentioned parties in a private or professional matter.
Presumably in an attempt to smear a local competitor, Hayden Otto inadvertently publishes irrefutable on-chain proof that he excluded non-BCH retail revenue to shape the "BCH #1 in Australia" narrative.
  • Scroll down to "Proof of exclusion" if you are tired of the drama recap.
  • Scroll down to "TLDR" if you want a summary.

Recap

In September 2019, BitcoinBCH.com started publishing so called monthly "reports" about crypto retail payments in Australia. They claimed that ~90% of Australia's crypto retail revenue is processed via their own HULA system and that ~92% of all crypto retail revenue happens in BCH.
They are aggregating two data sources to come up with this claim.
One is TravelByBit (TBB) who publishes their PoS transactions (BTC, LN, ETH, BNB, DASH, BCH) live on a ticker.
The other source is HULA, a newly introduced POS system (BCH only) and direct competitor to TBB run by BitcoinBCH.com - the same company who created the report. Despite being on-chain their transactions are private, not published and not verifiable by third parties outside BitcoinBCH.com
Two things stood out in the "reports", noted by multiple users (including vocal BCH proponents):
  • The non-BCH parts must have tx excluded and the report neglects to mention it (the total in their TBB analysis does not match what is reported on the TBB website.)
  • The BCH part has outliers included (e.g. BCH city conference in September with 35x the daily average)
The TBB website loads the historic tx data in the browser but hides transactions older than 7 days from being displayed, i.e. you can access more than 7 days worth of data if you understand JavaScript and can read the source code (source).

Hayden Otto's reaction

In direct response to me publishing these findings on btc, Hayden Otto - an employee at BitcoinBCH.com and the author of the report who also happens to be a moderator of /BitcoinCash - banned me immediately from said sub (source).
In subsequent discussion (which repeated for every monthly "report" which was flawed in the same ways as described above), Hayden responded using the same tactics:
"No data was removed"
"The guy is straight out lying. There is guaranteed no missing tx as the data was collected directly from the source." (source)
"Only data I considered non-retail was removed"
"I also had these data points and went through them to remove non-retail transactions, on both TravelbyBit and HULA." (source)
He admits to have removed non-BCH tx by "Game Ranger" because he considers them non-retail (source). He also implies they might be involved in money laundering and that TBB might fail their AML obligations in processing Game Ranger's transactions (source).
The report does not mention any data being excluded at all and he still fails to explain why several businesses that are clearly retail (e.g. restaurants, cafes, markets) had tx excluded (source).
"You are too late to prove I altered the data"
"[...] I recorded [the data] manually from https://travelbybit.com/stats/ over the month of September. The website only shows transactions from the last 7 days and then they disappear. No way for anyone to access stats beyond that." (source)
Fortunately you can, if you can read the website's source code. But you need to know a bit of JavaScript to verify it yourself, so not an ideal method to easily prove the claim of data exclusion to the public. But it laters turns out Hayden himself has found an easier way to achieve the same.
"The report can't be wrong because it has been audited."
In response to criticism about the flawed methodology in generating the September report, BitcoinBCH.com hired an accountant from a regional Bitcoin BCH startup to "audit" the October report. This is remarkable, because not only did their reported TBB totals still not match those from the TBB site - their result was mathematically impossible. How so? No subset of TBB transaction in that month sums up to the total they reported. So even if they excluded retail transactions at will, they still must have messed up the sum (source). Why didn't their auditor notice their mistake? She said she "conducted a review based on the TravelByBit data provided to her", i.e. the data acquisition and selection process was explicitly excluded from the audit (source).
"You are a 'pathetic liar', a 'desperate toll', an 'astroturf account' and 'a total dumb ass' and are 'pulling numbers out of your ass!'"
Since he has already banned me from the sub he moderates, he started to resort to ad hominems (source, source, source, source).

Proof of exclusion

I published raw data as extracted from the TBB site after each report for comparison. Hayden responded that I made those numbers up and that I was pulling numbers out of my ass.
Since he was under the impression that
"The website only shows transactions from the last 7 days and then they disappear. No way for anyone to access stats beyond that." (source)
he felt confident to claim that I would be
unable to provide a source for the [missing] data and/or prove that that data was not already included in the report. (source)
Luckily for us Hayden Otto seems to dislike his competitor TravelByBit so much that he attempted to reframe Bitcoin's RBF feature as a vulnerability specific to TBB PoS system (source).
While doublespending a merchant using the TBB PoS he wanted to prove that the merchant successfully registered the purchase as complete and thus exposed that the PoS sales history of TBB's merchants are available to the public (source), in his own words:
"You can literally access it from a public URL in the Web browser. There is no login or anything required, just type in the name of the merchant." (source)
As of yet it is unclear if this is intentional by TBB or if Hayden Ottos followed the rules of responsible disclosure before publishing this kind of data leak.
As it happens, those sale histories do not only include the merchant and time of purchases, they even include the address the funds were sent to (in case of on-chain payments).
This gives us an easy method to prove that the purchases from the TBB website missing in the reports belong to a specific retail business and actually happened - something that is impossible to prove for the alleged HULA txs.
In order to make it easier for you to verify it yourself, we'll focus on a single day in the dataset, September 17th, 2019 as an example:
  • Hayden Otto's report claims 20 tx and $713.00 in total for that day (source)
  • The TBB website listed 40 tx and a total of $1032.90 (daily summary)
  • Pick a merchant, e.g. "The Stand Desserts"
  • Use Hayden's "trick" to access that merchants public sale history at https://www.livingroomofsatoshi.com/merchanthistory/thestanddesserts, sort by date to find the 17th Sep 2019 and look for a transaction at 20:58 for $28. This proves that a purchase of said amount is associated with this specific retail business.
  • Paste the associated crypto on-chain address 17MrHiRcKzCyuKPtvtn7iZhAZxydX8raU9 in a blockchain explorer of your choice, e.g like this. This proves that a transfer of funds has actually happened.
I let software aggregate the TBB statistics with the public sale histories and you'll find at the bottom of this post a table with the on-chain addresses conveniently linked to blockchain explorers for our example date.
The total of all 40 tx is $1032.90 instead of the $713.00 reported by Hayden. 17 tx of those have a corresponding on-chain address and thus have undeniable proof of $758.10. Of the remaining 23, 22 are on Lightning and one had no merchant history available.
This is just for a single day, here is a comparison for the whole month.
Description Total
TBB Total $10,502
TBB wo. Game Ranger $5,407
TBB according to Hayden $3,737

What now?

The usual shills will respond in a predictive manner: The data must be fake even though its proof is on-chain, I would need to provide more data but HULA can be trusted without any proof, if you include outliers BCH comes out ahead, yada, yada.
But this is not important. I am not here to convince them and this post doesn't aim to.
The tx numbers we are talking about are less than 0.005% of Bitcoin's global volume. If you can increase adoption in your area by 100% by just buying 2 coffees more per day you get a rough idea about how irrelevant the numbers are in comparison.
What is relevant though and what this post aims to highlight is that BitcoinBCH.com and the media outlets around news.bitcoin.com flooding you with the BCH #1 narrative are playing dirty. They feel justified because they feel that Bitcoin/Core/Blockstream is playing dirty as well. I am not here to judge that but you as a reader of this sub should be aware that this is happening and that you are the target.
When BitcoinBCH.com excludes $1,000 Bitcoin tx because of high value but includes $15,000 BCH tx because they are made by "professionals", you should be sceptical.
When BitcoinBCH.com excludes game developers, travel businesses or craftsmen accepting Bitcoin because they don't have a physical store but include a lawyer practice accepting BCH, you should be sceptical.
When BitcoinBCH.com excludes restaurants, bars and supermarkets accepting Bitcoin and when pressed reiterate that they excluded non-retail businesses without ever explaning why a restaurant shouldn't be considered reatil, you should be sceptical.
When BitcoinBCH.com claims the reports have been audited but omit that the data acquisition was not part of the audit, you should be sceptical.
I expect that BitcoinBCH.com will stop removing transactions from TBB for their reports now that it has been shown that their exclusion can be provably uncovered. I also expect that HULA's BCH numbers will rise accordingly to maintain a similar difference.
Hayden Otto assumed that nobody could cross-check the TBB data. He was wrong. Nobody will be able to disprove his claims when HULA's BCH numbers rise as he continues to refuse their release. You should treat his claims accordingly.
As usual, do your own research and draw your own conclusion. Sorry for the long read.

TLDR

  • BitcoinBCH.com claimed no transactions were removed from the TBB dataset in their BCH #1 reports and that is impossible to prove the opposite.
  • Hayden Otto's reveals in a double spend attempt that a TBB merchant's sale history can be accessed publicly including the merchant's on-chain addresses.
  • (For example,) this table shows 40 tx listed on the TBB site on Sep 17th, including their on-chain addresses where applicable. The BitcoinBCH.com report lists only 20 tx for the same day.
  • (Most days and every months so far has had BTC transactions excluded.)
  • (For September, TBB lists $10,502 yet the report only claims $3,737.
No. Date Merchant Asset Address Amount Total
1 17 Sep 19 09:28 LTD Espresso Lightning Unable to find merchant history. 4.50 4.50
2 17 Sep 19 09:40 LTD Espresso Binance Coin Unable to find merchant history. 4.50 9.00
3 17 Sep 19 13:22 Josh's IGA Murray Bridge West Ether 0x40fd53aa...b6de43c531 4.60 13.60
4 17 Sep 19 13:23 Nom Nom Korean Eatery Lightning lnbc107727...zkcqvvgklf 16.00 29.60
5 17 Sep 19 13:24 Nom Nom Korean Eatery Lightning lnbc100994...mkspwddgqw 15.00 44.60
6 17 Sep 19 14:02 Nom Nom Korean Eatery Binance Coin bnb1w5mwu9...552thl4ru5 30.00 74.60
7 17 Sep 19 15:19 Dollars and Sense (Fortitude Valley) Lightning lnbc134780...93cpanyxfg 2.00 76.60
8 17 Sep 19 15:34 Steph's Cafe Binance Coin bnb124hcjy...ss3pz9y3r8 57.50 134.10
9 17 Sep 19 19:37 The Stand Desserts Binance Coin bnb13f58s9...qqc7fxln7s 18.00 152.10
10 17 Sep 19 19:59 The Stand Desserts Lightning lnbc575880...48cpl0z06q 8.50 160.60
11 17 Sep 19 20:00 The Stand Desserts Lightning lnbc575770...t8spzjflym 8.50 169.10
12 17 Sep 19 20:13 The Stand Desserts Lightning lnbc202980...lgqp5ha8f4 3.00 172.10
13 17 Sep 19 20:21 The Stand Desserts Lightning lnbc577010...decq7r4p05 8.50 180.60
14 17 Sep 19 20:24 Fat Dumpling Lightning lnbc217145...9dsqpjjr6g 32.10 212.70
15 17 Sep 19 20:31 The Stand Desserts Lightning lnbc574530...wvcpp3pcen 8.50 221.20
16 17 Sep 19 20:33 The Stand Desserts Lightning lnbc540660...rpqpzgk8z0 8.00 229.20
17 17 Sep 19 20:37 The Stand Desserts Lightning lnbc128468...r8cqq50p5c 19.00 248.20
18 17 Sep 19 20:39 The Stand Desserts Lightning lnbc135220...cngp2zq6q4 2.00 250.20
19 17 Sep 19 20:45 The Stand Desserts Lightning lnbc574570...atcqg738p8 8.50 258.70
20 17 Sep 19 20:51 Fat Dumpling Lightning lnbc414190...8hcpg79h9a 61.20 319.90
21 17 Sep 19 20:53 The Stand Desserts Lightning lnbc135350...krqqp3cz8z 2.00 321.90
22 17 Sep 19 20:58 The Stand Desserts Bitcoin 17MrHiRcKz...ZxydX8raU9 28.00 349.90
23 17 Sep 19 21:02 The Stand Desserts Bitcoin 1Hwy8hCBff...iEh5fBsCWK 10.00 359.90
24 17 Sep 19 21:03 The Stand Desserts Lightning lnbc743810...dvqqnuunjq 11.00 370.90
25 17 Sep 19 21:04 The Stand Desserts Lightning lnbc114952...2vqpclm87p 17.00 387.90
26 17 Sep 19 21:10 The Stand Desserts Lightning lnbc169160...lpqqqt574c 2.50 390.40
27 17 Sep 19 21:11 The Stand Desserts Lightning lnbc575150...40qq9yuqmy 8.50 398.90
28 17 Sep 19 21:13 The Stand Desserts Lightning lnbc947370...qjcp3unr33 14.00 412.90
29 17 Sep 19 21:15 The Stand Desserts Binance Coin bnb1tc2vva...xppes5t7d0 16.00 428.90
30 17 Sep 19 21:16 Giardinetto Binance Coin bnb1auyep2...w64p6a6dlk 350.00 778.90
31 17 Sep 19 21:25 The Stand Desserts BCH 3H2iJaKNXH...5sxPk3t2tV 7.00 785.90
32 17 Sep 19 21:39 The Stand Desserts Binance Coin bnb17r7x3e...avaxwumc58 8.00 793.90
33 17 Sep 19 21:47 The Stand Desserts BCH 32kuPYT1tc...uFQwgsA5ku 18.00 811.90
34 17 Sep 19 21:52 The Stand Desserts BCH 3ELPvxtCSy...4QzvfVJsNZ 36.00 847.90
35 17 Sep 19 21:56 The Stand Desserts Lightning lnbc677740...acsp04sjeg 10.00 857.90
36 17 Sep 19 22:04 The Stand Desserts BCH 38b4wHg9cg...9L2WXC2BSK 54.00 911.90
37 17 Sep 19 22:16 The Stand Desserts Binance Coin bnb14lylhs...x6wz7kjzp5 18.00 929.90
38 17 Sep 19 22:21 The Stand Desserts BCH 3L8SK3Hr7u...F3htdSPxfL 90.00 1019.90
39 17 Sep 19 22:30 The Stand Desserts Binance Coin bnb19w6tle...774uknv57t 5.00 1024.90
40 17 Sep 19 22:48 The Stand Desserts BCH 3Qag8c4UYg...9EYuWzGjhs 8.00 1032.90
submitted by YeOldDoc to CryptoCurrency [link] [comments]

Adding Monero support to a P2P game, need some advice

Hello everyone,
I'm currently in the process of adding Monero support to a peer-to-peer game I've been working on and would like to ask this community for some advice.
The application has a few hard requirements that must be met:
  1. The Monero integration must be done using JavaScript (primarily for Node but browser's okay too).
  2. The application must be able to create addresses and accompanying private keys internally (no CLI or external API). Preferably, these should be derived addresses using a master or main one (like HD wallets in Bitcoin).
  3. The application must be able to generate raw transactions internally -- no CLI or or external API. For this part let's assume that the input UTXOs are going to be available somehow (from a database, for example).
  4. The application must be able to sign raw transactions internally -- no CLI or or external API.
When I say "no CLI", I mean no RPC wallet or daemon; no external API calls either.
Essentially, I should be able to do the above offline, using JavaScript only, and then just post the signed transactions later (this part can be done via CLI or API). These are core requirements for the project otherwise I'd just use RPC or a service and save myself a lot of work.
So my question is: is there a documented JavaScript library that supports all of the above functionality?
I found a project called mymonero-core-js which appears to do what I'd need, but there doesn't seem to be any accompanying documentation (the included unit tests don't offer much information). Does this documentation exist?
There's also an offline wallet generator but it's also undocumented and kinda unwieldy (one huge file).
The game (my project), already supports Bitcoin and Bitcoin Cash using these constraints, and I've done fairly extensive work with Ethereum, smart contracts, and crypto in general (not just cryptocurrencies, I mean), so I shouldn't need much hand-holding.
Thanks muchly in advance!
P.S. It's not my intention to advertise my project so I haven't posted a link but I'll be happy to share if anyone asks.
submitted by monican_agent to Monero [link] [comments]

Blockchain Security with Michael Shaulov

Hello everyone - the latest episode of The BitcoinTaxes Podcast is live. In this podcast, we interview experts in the crypto/blockchain/fintech spaces who share their insights and opinions. In this episode, we speak with Michael Shaulov, CEO and Co-Founder of Fireblocks, and we discuss security as it relates to blockchain technology and cryptocurrency; and the unique challenges that exist in the space.
Full disclosure, I work for BitcoinTaxes and also help with the production process of this podcast. I have been posting our latest episodes on this as well as other subreddits, and I have noticed people seem to enjoy/engage with them. However, please let me know if you find an issue posting this here (not trying to spam people). Otherwise, I hope you guys enjoy this episode and gain some valuable knowledge. Feel free to hit me with any further questions so I can relay them to Michael.
BTW, if you want to be on the show (or if you know anyone who might be a good fit), please let me know. We are always looking for exciting topics to discuss in the show and add value to the crypto community.
Find the full episode here!
Episode Page
Audio Only
_______________
Episode highlights & Discussion
A Lengthy History of Cyber Security Experience (00:40) Michael: I started in cyber security about 20 years ago in the Israeli cyber command, basically the corresponding unit to the American NSA. About nine years ago, I started my previous company…doing mobile security for enterprise customers. Basically, protecting their mobile devices from being hacked; malware attacks over WIFI, phishing and so on. We had folks like Intel, Samsung, and Geico as part of our customer base. About three years ago I sort of stepped into the Bitcoin & blockchain space – we actually were investigating a fairly big hack that happened in South Korea. That was sort of the first time that I stepped into this asset class and then realized that there is work to be done here to increase the security. Fireblocks Aims To Solve An Age-Old Cyber Security Issue (03:30) Michael: A lot of trading related activities and setups were being established from hedge funds to exchanges, to proprietary trading groups, to a lot of different brokers, OTCs, lending providers – generally speaking they need a very different infrastructure. You clearly have a lot of both external cybersecurity risks, but also internal cyber security risks inside the institutional environments. Our average transaction size is north of $100,000 – you have zero room to make a mistake because the nature of public blockchains is that there is no recourse. Because there were so many mistakes or hacks…most organizations had a lot of operational constraints in terms of how they were actually sending the transactions: they will do all the tests transfers, they will have multiple people approve and sign those transactions to make sure that there are no errors…you are only able to do those transactions incidents during certain windows during the day…A lot of different constraints, anxiety, and operational deficiency. It’s not a good return on capital. You are still susceptible to the human factor. You actually need to do 100 transactions per day, and you have three, four people in your operations team. At some point they will make an error, right? That’s just a numbers game over there. Basically, what we’ve created is a solution that solves all those issues. First, we provide our customers with a high secure, high SLA storage that is institutional grade. Second, is basically what we call the Fireblocks Network is essentially an authentication network for settlements between counter parties. We currently have integration to about 30 exchanges. We have over 60 market participants on our platform. Overall, 90 organizations that are on our platform, transferring coins between them with a click of a button without actually being susceptible to making a human error or susceptible to any of those hacks. Three Critical Attack Vectors Exploited by Hackers to Steal Digital Assets (Text From Fireblocks WhitePaper; Discussion @ 12:25) Wallet Compromise Access to your wallet is powered by private keys which control your funds stored on the blockchain. This means that as soon as a malicious actor acquires your private key they too have control and can transfer the funds from the wallet. The most common methods for compromising private keys are: • Infecting a server with malware that steals the private key. • Stealing the HSM authentication token and forcing the HSM to sign a withdraw transaction. • An authorized internal employee steals the private key. Deposit Address Spoofing Derived from the public key, deposit addresses are long strings of alphanumeric values that designate the public address of a wallet to which funds are sent. In order for two parties to facilitate a transaction, they need to exchange the deposit address. However, as there is no current end-to-end security protocol for the address exchange, hackers can target the procedure at any number of points along the way. Such methods include: • Spoofing the address while copy and pasting between the web browser and the wallet’s app. • Hijacking javascript(s) on the exchange’s website and spoofing the address at the origin. • Malicious chrome plugins that hijack the web browser (man-in-the-browser). • Malware that hijacks the wallet interface or driver. Credentials and API Keys Currently, each exchange and liquidity provider requires a set of credentials (username and password) in order to gain access. In addition, API-keys can be generated for automated access to the platforms. These credentials are particularly vulnerable to many traditional forms of malware such as keylogging and phishing. API-keys stored in trading software can be harvested if the server or code repository is compromised. Once a hacker obtains elevated credentials or API-keys they could: • Instruct unauthorized withdrawal of funds from an exchange. • Manipulate the market using pre-funded assets on a compromised account.
submitted by IsaN-BitcoinTax to BlockchainNews [link] [comments]

Blockchain Security with Michael Shaulov

Hello everyone - the latest episode of The BitcoinTaxes Podcast is live. In this podcast, we interview experts in the crypto/blockchain/fintech spaces who share their insights and opinions. In this episode, we speak with Michael Shaulov, CEO and Co-Founder of Fireblocks, and we discuss security as it relates to blockchain technology and cryptocurrency; and the unique challenges that exist in the space.
Full disclosure, I work for BitcoinTaxes and also help with the production process of this podcast. I have been posting our latest episodes on this as well as other subreddits, and I have noticed people seem to enjoy/engage with them. However, please let me know if you find an issue posting this here (not trying to spam people). Otherwise, I hope you guys enjoy this episode and gain some valuable knowledge. Feel free to hit me with any further questions so I can relay them to Michael.
BTW, if you want to be on the show (or if you know anyone who might be a good fit), please let me know. We are always looking for exciting topics to discuss in the show and add value to the crypto community.
Find the full episode here!
Episode Page
Audio Only
_______________
Episode highlights & Discussion
A Lengthy History of Cyber Security Experience (00:40) Michael: I started in cyber security about 20 years ago in the Israeli cyber command, basically the corresponding unit to the American NSA. About nine years ago, I started my previous company…doing mobile security for enterprise customers. Basically, protecting their mobile devices from being hacked; malware attacks over WIFI, phishing and so on. We had folks like Intel, Samsung, and Geico as part of our customer base. About three years ago I sort of stepped into the Bitcoin & blockchain space – we actually were investigating a fairly big hack that happened in South Korea. That was sort of the first time that I stepped into this asset class and then realized that there is work to be done here to increase the security. Fireblocks Aims To Solve An Age-Old Cyber Security Issue (03:30) Michael: A lot of trading related activities and setups were being established from hedge funds to exchanges, to proprietary trading groups, to a lot of different brokers, OTCs, lending providers – generally speaking they need a very different infrastructure. You clearly have a lot of both external cybersecurity risks, but also internal cyber security risks inside the institutional environments. Our average transaction size is north of $100,000 – you have zero room to make a mistake because the nature of public blockchains is that there is no recourse. Because there were so many mistakes or hacks…most organizations had a lot of operational constraints in terms of how they were actually sending the transactions: they will do all the tests transfers, they will have multiple people approve and sign those transactions to make sure that there are no errors…you are only able to do those transactions incidents during certain windows during the day…A lot of different constraints, anxiety, and operational deficiency. It’s not a good return on capital. You are still susceptible to the human factor. You actually need to do 100 transactions per day, and you have three, four people in your operations team. At some point they will make an error, right? That’s just a numbers game over there. Basically, what we’ve created is a solution that solves all those issues. First, we provide our customers with a high secure, high SLA storage that is institutional grade. Second, is basically what we call the Fireblocks Network is essentially an authentication network for settlements between counter parties. We currently have integration to about 30 exchanges. We have over 60 market participants on our platform. Overall, 90 organizations that are on our platform, transferring coins between them with a click of a button without actually being susceptible to making a human error or susceptible to any of those hacks. Three Critical Attack Vectors Exploited by Hackers to Steal Digital Assets (Text From Fireblocks WhitePaper; Discussion @ 12:25) Wallet Compromise Access to your wallet is powered by private keys which control your funds stored on the blockchain. This means that as soon as a malicious actor acquires your private key they too have control and can transfer the funds from the wallet. The most common methods for compromising private keys are: • Infecting a server with malware that steals the private key. • Stealing the HSM authentication token and forcing the HSM to sign a withdraw transaction. • An authorized internal employee steals the private key. Deposit Address Spoofing Derived from the public key, deposit addresses are long strings of alphanumeric values that designate the public address of a wallet to which funds are sent. In order for two parties to facilitate a transaction, they need to exchange the deposit address. However, as there is no current end-to-end security protocol for the address exchange, hackers can target the procedure at any number of points along the way. Such methods include: • Spoofing the address while copy and pasting between the web browser and the wallet’s app. • Hijacking javascript(s) on the exchange’s website and spoofing the address at the origin. • Malicious chrome plugins that hijack the web browser (man-in-the-browser). • Malware that hijacks the wallet interface or driver. Credentials and API Keys Currently, each exchange and liquidity provider requires a set of credentials (username and password) in order to gain access. In addition, API-keys can be generated for automated access to the platforms. These credentials are particularly vulnerable to many traditional forms of malware such as keylogging and phishing. API-keys stored in trading software can be harvested if the server or code repository is compromised. Once a hacker obtains elevated credentials or API-keys they could: • Instruct unauthorized withdrawal of funds from an exchange. • Manipulate the market using pre-funded assets on a compromised account.
submitted by IsaN-BitcoinTax to BlockchainStartups [link] [comments]

Why i’m bullish on Zilliqa (long read)

Hey all, I've been researching coins since 2017 and have gone through 100s of them in the last 3 years. I got introduced to blockchain via Bitcoin of course, analysed Ethereum thereafter and from that moment I have a keen interest in smart contact platforms. I’m passionate about Ethereum but I find Zilliqa to have a better risk reward ratio. Especially because Zilliqa has found an elegant balance between being secure, decentralised and scalable in my opinion.
 
Below I post my analysis why from all the coins I went through I’m most bullish on Zilliqa (yes I went through Tezos, EOS, NEO, VeChain, Harmony, Algorand, Cardano etc.). Note that this is not investment advice and although it's a thorough analysis there is obviously some bias involved. Looking forward to what you all think!
 
Fun fact: the name Zilliqa is a play on ‘silica’ silicon dioxide which means “Silicon for the high-throughput consensus computer.”
 
This post is divided into (i) Technology, (ii) Business & Partnerships, and (iii) Marketing & Community. I’ve tried to make the technology part readable for a broad audience. If you’ve ever tried understanding the inner workings of Bitcoin and Ethereum you should be able to grasp most parts. Otherwise just skim through and once you are zoning out head to the next part.
 
Technology and some more:
 
Introduction The technology is one of the main reasons why I’m so bullish on Zilliqa. First thing you see on their website is: “Zilliqa is a high-performance, high-security blockchain platform for enterprises and next-generation applications.” These are some bold statements.
 
Before we deep dive into the technology let’s take a step back in time first as they have quite the history. The initial research paper from which Zilliqa originated dates back to August 2016: Elastico: A Secure Sharding Protocol For Open Blockchains where Loi Luu (Kyber Network) is one of the co-authors. Other ideas that led to the development of what Zilliqa has become today are: Bitcoin-NG, collective signing CoSi, ByzCoin and Omniledger.
 
The technical white paper was made public in August 2017 and since then they have achieved everything stated in the white paper and also created their own open source intermediate level smart contract language called Scilla (functional programming language similar to OCaml) too.
 
Mainnet is live since end of January 2019 with daily transaction rate growing continuously. About a week ago mainnet reached 5 million transactions, 500.000+ addresses in total along with 2400 nodes keeping the network decentralised and secure. Circulating supply is nearing 11 billion and currently only mining rewards are left. Maximum supply is 21 billion with annual inflation being 7.13% currently and will only decrease with time.
 
Zilliqa realised early on that the usage of public cryptocurrencies and smart contracts were increasing but decentralised, secure and scalable alternatives were lacking in the crypto space. They proposed to apply sharding onto a public smart contract blockchain where the transaction rate increases almost linear with the increase in amount of nodes. More nodes = higher transaction throughput and increased decentralisation. Sharding comes in many forms and Zilliqa uses network-, transaction- and computational sharding. Network sharding opens up the possibility of using transaction- and computational sharding on top. Zilliqa does not use state sharding for now. We’ll come back to this later.
 
Before we continue disecting how Zilliqa achieves such from a technological standpoint it’s good to keep in mind that a blockchain being decentralised and secure and scalable is still one of the main hurdles in allowing widespread usage of decentralised networks. In my opinion this needs to be solved first before blockchains can get to the point where they can create and add large scale value. So I invite you to read the next section to grasp the underlying fundamentals. Because after all these premises need to be true otherwise there isn’t a fundamental case to be bullish on Zilliqa, right?
 
Down the rabbit hole
 
How have they achieved this? Let’s define the basics first: key players on Zilliqa are the users and the miners. A user is anybody who uses the blockchain to transfer funds or run smart contracts. Miners are the (shard) nodes in the network who run the consensus protocol and get rewarded for their service in Zillings (ZIL). The mining network is divided into several smaller networks called shards, which is also referred to as ‘network sharding’. Miners subsequently are randomly assigned to a shard by another set of miners called DS (Directory Service) nodes. The regular shards process transactions and the outputs of these shards are eventually combined by the DS shard as they reach consensus on the final state. More on how these DS shards reach consensus (via pBFT) will be explained later on.
 
The Zilliqa network produces two types of blocks: DS blocks and Tx blocks. One DS Block consists of 100 Tx Blocks. And as previously mentioned there are two types of nodes concerned with reaching consensus: shard nodes and DS nodes. Becoming a shard node or DS node is being defined by the result of a PoW cycle (Ethash) at the beginning of the DS Block. All candidate mining nodes compete with each other and run the PoW (Proof-of-Work) cycle for 60 seconds and the submissions achieving the highest difficulty will be allowed on the network. And to put it in perspective: the average difficulty for one DS node is ~ 2 Th/s equaling 2.000.000 Mh/s or 55 thousand+ GeForce GTX 1070 / 8 GB GPUs at 35.4 Mh/s. Each DS Block 10 new DS nodes are allowed. And a shard node needs to provide around 8.53 GH/s currently (around 240 GTX 1070s). Dual mining ETH/ETC and ZIL is possible and can be done via mining software such as Phoenix and Claymore. There are pools and if you have large amounts of hashing power (Ethash) available you could mine solo.
 
The PoW cycle of 60 seconds is a peak performance and acts as an entry ticket to the network. The entry ticket is called a sybil resistance mechanism and makes it incredibly hard for adversaries to spawn lots of identities and manipulate the network with these identities. And after every 100 Tx Blocks which corresponds to roughly 1,5 hour this PoW process repeats. In between these 1,5 hour no PoW needs to be done meaning Zilliqa’s energy consumption to keep the network secure is low. For more detailed information on how mining works click here.
Okay, hats off to you. You have made it this far. Before we go any deeper down the rabbit hole we first must understand why Zilliqa goes through all of the above technicalities and understand a bit more what a blockchain on a more fundamental level is. Because the core of Zilliqa’s consensus protocol relies on the usage of pBFT (practical Byzantine Fault Tolerance) we need to know more about state machines and their function. Navigate to Viewblock, a Zilliqa block explorer, and just come back to this article. We will use this site to navigate through a few concepts.
 
We have established that Zilliqa is a public and distributed blockchain. Meaning that everyone with an internet connection can send ZILs, trigger smart contracts etc. and there is no central authority who fully controls the network. Zilliqa and other public and distributed blockchains (like Bitcoin and Ethereum) can also be defined as state machines.
 
Taking the liberty of paraphrasing examples and definitions given by Samuel Brooks’ medium article, he describes the definition of a blockchain (like Zilliqa) as:
“A peer-to-peer, append-only datastore that uses consensus to synchronise cryptographically-secure data”.
 
Next he states that: >“blockchains are fundamentally systems for managing valid state transitions”.* For some more context, I recommend reading the whole medium article to get a better grasp of the definitions and understanding of state machines. Nevertheless, let’s try to simplify and compile it into a single paragraph. Take traffic lights as an example: all its states (red, amber and green) are predefined, all possible outcomes are known and it doesn’t matter if you encounter the traffic light today or tomorrow. It will still behave the same. Managing the states of a traffic light can be done by triggering a sensor on the road or pushing a button resulting in one traffic lights’ state going from green to red (via amber) and another light from red to green.
 
With public blockchains like Zilliqa this isn’t so straightforward and simple. It started with block #1 almost 1,5 years ago and every 45 seconds or so a new block linked to the previous block is being added. Resulting in a chain of blocks with transactions in it that everyone can verify from block #1 to the current #647.000+ block. The state is ever changing and the states it can find itself in are infinite. And while the traffic light might work together in tandem with various other traffic lights, it’s rather insignificant comparing it to a public blockchain. Because Zilliqa consists of 2400 nodes who need to work together to achieve consensus on what the latest valid state is while some of these nodes may have latency or broadcast issues, drop offline or are deliberately trying to attack the network etc.
 
Now go back to the Viewblock page take a look at the amount of transaction, addresses, block and DS height and then hit refresh. Obviously as expected you see new incremented values on one or all parameters. And how did the Zilliqa blockchain manage to transition from a previous valid state to the latest valid state? By using pBFT to reach consensus on the latest valid state.
 
After having obtained the entry ticket, miners execute pBFT to reach consensus on the ever changing state of the blockchain. pBFT requires a series of network communication between nodes, and as such there is no GPU involved (but CPU). Resulting in the total energy consumed to keep the blockchain secure, decentralised and scalable being low.
 
pBFT stands for practical Byzantine Fault Tolerance and is an optimisation on the Byzantine Fault Tolerant algorithm. To quote Blockonomi: “In the context of distributed systems, Byzantine Fault Tolerance is the ability of a distributed computer network to function as desired and correctly reach a sufficient consensus despite malicious components (nodes) of the system failing or propagating incorrect information to other peers.” Zilliqa is such a distributed computer network and depends on the honesty of the nodes (shard and DS) to reach consensus and to continuously update the state with the latest block. If pBFT is a new term for you I can highly recommend the Blockonomi article.
 
The idea of pBFT was introduced in 1999 - one of the authors even won a Turing award for it - and it is well researched and applied in various blockchains and distributed systems nowadays. If you want more advanced information than the Blockonomi link provides click here. And if you’re in between Blockonomi and University of Singapore read the Zilliqa Design Story Part 2 dating from October 2017.
Quoting from the Zilliqa tech whitepaper: “pBFT relies upon a correct leader (which is randomly selected) to begin each phase and proceed when the sufficient majority exists. In case the leader is byzantine it can stall the entire consensus protocol. To address this challenge, pBFT offers a view change protocol to replace the byzantine leader with another one.”
 
pBFT can tolerate ⅓ of the nodes being dishonest (offline counts as Byzantine = dishonest) and the consensus protocol will function without stalling or hiccups. Once there are more than ⅓ of dishonest nodes but no more than ⅔ the network will be stalled and a view change will be triggered to elect a new DS leader. Only when more than ⅔ of the nodes are dishonest (>66%) double spend attacks become possible.
 
If the network stalls no transactions can be processed and one has to wait until a new honest leader has been elected. When the mainnet was just launched and in its early phases, view changes happened regularly. As of today the last stalling of the network - and view change being triggered - was at the end of October 2019.
 
Another benefit of using pBFT for consensus besides low energy is the immediate finality it provides. Once your transaction is included in a block and the block is added to the chain it’s done. Lastly, take a look at this article where three types of finality are being defined: probabilistic, absolute and economic finality. Zilliqa falls under the absolute finality (just like Tendermint for example). Although lengthy already we skipped through some of the inner workings from Zilliqa’s consensus: read the Zilliqa Design Story Part 3 and you will be close to having a complete picture on it. Enough about PoW, sybil resistance mechanism, pBFT etc. Another thing we haven’t looked at yet is the amount of decentralisation.
 
Decentralisation
 
Currently there are four shards, each one of them consisting of 600 nodes. 1 shard with 600 so called DS nodes (Directory Service - they need to achieve a higher difficulty than shard nodes) and 1800 shard nodes of which 250 are shard guards (centralised nodes controlled by the team). The amount of shard guards has been steadily declining from 1200 in January 2019 to 250 as of May 2020. On the Viewblock statistics you can see that many of the nodes are being located in the US but those are only the (CPU parts of the) shard nodes who perform pBFT. There is no data from where the PoW sources are coming. And when the Zilliqa blockchain starts reaching their transaction capacity limit, a network upgrade needs to be executed to lift the current cap of maximum 2400 nodes to allow more nodes and formation of more shards which will allow to network to keep on scaling according to demand.
Besides shard nodes there are also seed nodes. The main role of seed nodes is to serve as direct access points (for end users and clients) to the core Zilliqa network that validates transactions. Seed nodes consolidate transaction requests and forward these to the lookup nodes (another type of nodes) for distribution to the shards in the network. Seed nodes also maintain the entire transaction history and the global state of the blockchain which is needed to provide services such as block explorers. Seed nodes in the Zilliqa network are comparable to Infura on Ethereum.
 
The seed nodes were first only operated by Zilliqa themselves, exchanges and Viewblock. Operators of seed nodes like exchanges had no incentive to open them for the greater public.They were centralised at first. Decentralisation at the seed nodes level has been steadily rolled out since March 2020 ( Zilliqa Improvement Proposal 3 ). Currently the amount of seed nodes is being increased, they are public facing and at the same time PoS is applied to incentivize seed node operators and make it possible for ZIL holders to stake and earn passive yields. Important distinction: seed nodes are not involved with consensus! That is still PoW as entry ticket and pBFT for the actual consensus.
 
5% of the block rewards are being assigned to seed nodes (from the beginning in 2019) and those are being used to pay out ZIL stakers.The 5% block rewards with an annual yield of 10.03% translates to roughly 610 MM ZILs in total that can be staked. Exchanges use the custodial variant of staking and wallets like Moonlet will use the non custodial version (starting in Q3 2020). Staking is being done by sending ZILs to a smart contract created by Zilliqa and audited by Quantstamp.
 
With a high amount of DS & shard nodes and seed nodes becoming more decentralised too, Zilliqa qualifies for the label of decentralised in my opinion.
 
Smart contracts
 
Let me start by saying I’m not a developer and my programming skills are quite limited. So I‘m taking the ELI5 route (maybe 12) but if you are familiar with Javascript, Solidity or specifically OCaml please head straight to Scilla - read the docs to get a good initial grasp of how Zilliqa’s smart contract language Scilla works and if you ask yourself “why another programming language?” check this article. And if you want to play around with some sample contracts in an IDE click here. Faucet can be found here. And more information on architecture, dapp development and API can be found on the Developer Portal.
If you are more into listening and watching: check this recent webinar explaining Zilliqa and Scilla. Link is time stamped so you’ll start right away with a platform introduction, R&D roadmap 2020 and afterwards a proper Scilla introduction.
 
Generalised: programming languages can be divided into being ‘object oriented’ or ‘functional’. Here is an ELI5 given by software development academy: > “all programmes have two basic components, data – what the programme knows – and behaviour – what the programme can do with that data. So object-oriented programming states that combining data and related behaviours in one place, is called “object”, which makes it easier to understand how a particular program works. On the other hand, functional programming argues that data and behaviour are different things and should be separated to ensure their clarity.”
 
Scilla is on the functional side and shares similarities with OCaml: > OCaml is a general purpose programming language with an emphasis on expressiveness and safety. It has an advanced type system that helps catch your mistakes without getting in your way. It's used in environments where a single mistake can cost millions and speed matters, is supported by an active community, and has a rich set of libraries and development tools. For all its power, OCaml is also pretty simple, which is one reason it's often used as a teaching language.
 
Scilla is blockchain agnostic, can be implemented onto other blockchains as well, is recognised by academics and won a so called Distinguished Artifact Award award at the end of last year.
 
One of the reasons why the Zilliqa team decided to create their own programming language focused on preventing smart contract vulnerabilities safety is that adding logic on a blockchain, programming, means that you cannot afford to make mistakes. Otherwise it could cost you. It’s all great and fun blockchains being immutable but updating your code because you found a bug isn’t the same as with a regular web application for example. And with smart contracts it inherently involves cryptocurrencies in some form thus value.
 
Another difference with programming languages on a blockchain is gas. Every transaction you do on a smart contract platform like Zilliqa for Ethereum costs gas. With gas you basically pay for computational costs. Sending a ZIL from address A to address B costs 0.001 ZIL currently. Smart contracts are more complex, often involve various functions and require more gas (if gas is a new concept click here ).
 
So with Scilla, similar to Solidity, you need to make sure that “every function in your smart contract will run as expected without hitting gas limits. An improper resource analysis may lead to situations where funds may get stuck simply because a part of the smart contract code cannot be executed due to gas limits. Such constraints are not present in traditional software systems”. Scilla design story part 1
 
Some examples of smart contract issues you’d want to avoid are: leaking funds, ‘unexpected changes to critical state variables’ (example: someone other than you setting his or her address as the owner of the smart contract after creation) or simply killing a contract.
 
Scilla also allows for formal verification. Wikipedia to the rescue:
In the context of hardware and software systems, formal verification is the act of proving or disproving the correctness of intended algorithms underlying a system with respect to a certain formal specification or property, using formal methods of mathematics.
 
Formal verification can be helpful in proving the correctness of systems such as: cryptographic protocols, combinational circuits, digital circuits with internal memory, and software expressed as source code.
 
Scilla is being developed hand-in-hand with formalization of its semantics and its embedding into the Coq proof assistant — a state-of-the art tool for mechanized proofs about properties of programs.”
 
Simply put, with Scilla and accompanying tooling developers can be mathematically sure and proof that the smart contract they’ve written does what he or she intends it to do.
 
Smart contract on a sharded environment and state sharding
 
There is one more topic I’d like to touch on: smart contract execution in a sharded environment (and what is the effect of state sharding). This is a complex topic. I’m not able to explain it any easier than what is posted here. But I will try to compress the post into something easy to digest.
 
Earlier on we have established that Zilliqa can process transactions in parallel due to network sharding. This is where the linear scalability comes from. We can define simple transactions: a transaction from address A to B (Category 1), a transaction where a user interacts with one smart contract (Category 2) and the most complex ones where triggering a transaction results in multiple smart contracts being involved (Category 3). The shards are able to process transactions on their own without interference of the other shards. With Category 1 transactions that is doable, with Category 2 transactions sometimes if that address is in the same shard as the smart contract but with Category 3 you definitely need communication between the shards. Solving that requires to make a set of communication rules the protocol needs to follow in order to process all transactions in a generalised fashion.
 
And this is where the downsides of state sharding comes in currently. All shards in Zilliqa have access to the complete state. Yes the state size (0.1 GB at the moment) grows and all of the nodes need to store it but it also means that they don’t need to shop around for information available on other shards. Requiring more communication and adding more complexity. Computer science knowledge and/or developer knowledge required links if you want to dig further: Scilla - language grammar Scilla - Foundations for Verifiable Decentralised Computations on a Blockchain Gas Accounting NUS x Zilliqa: Smart contract language workshop
 
Easier to follow links on programming Scilla https://learnscilla.com/home Ivan on Tech
 
Roadmap / Zilliqa 2.0
 
There is no strict defined roadmap but here are topics being worked on. And via the Zilliqa website there is also more information on the projects they are working on.
 
Business & Partnerships  
It’s not only technology in which Zilliqa seems to be excelling as their ecosystem has been expanding and starting to grow rapidly. The project is on a mission to provide OpenFinance (OpFi) to the world and Singapore is the right place to be due to its progressive regulations and futuristic thinking. Singapore has taken a proactive approach towards cryptocurrencies by introducing the Payment Services Act 2019 (PS Act). Among other things, the PS Act will regulate intermediaries dealing with certain cryptocurrencies, with a particular focus on consumer protection and anti-money laundering. It will also provide a stable regulatory licensing and operating framework for cryptocurrency entities, effectively covering all crypto businesses and exchanges based in Singapore. According to PWC 82% of the surveyed executives in Singapore reported blockchain initiatives underway and 13% of them have already brought the initiatives live to the market. There is also an increasing list of organisations that are starting to provide digital payment services. Moreover, Singaporean blockchain developers Building Cities Beyond has recently created an innovation $15 million grant to encourage development on its ecosystem. This all suggest that Singapore tries to position itself as (one of) the leading blockchain hubs in the world.
 
Zilliqa seems to already taking advantage of this and recently helped launch Hg Exchange on their platform, together with financial institutions PhillipCapital, PrimePartners and Fundnel. Hg Exchange, which is now approved by the Monetary Authority of Singapore (MAS), uses smart contracts to represent digital assets. Through Hg Exchange financial institutions worldwide can use Zilliqa's safe-by-design smart contracts to enable the trading of private equities. For example, think of companies such as Grab, AirBnB, SpaceX that are not available for public trading right now. Hg Exchange will allow investors to buy shares of private companies & unicorns and capture their value before an IPO. Anquan, the main company behind Zilliqa, has also recently announced that they became a partner and shareholder in TEN31 Bank, which is a fully regulated bank allowing for tokenization of assets and is aiming to bridge the gap between conventional banking and the blockchain world. If STOs, the tokenization of assets, and equity trading will continue to increase, then Zilliqa’s public blockchain would be the ideal candidate due to its strategic positioning, partnerships, regulatory compliance and the technology that is being built on top of it.
 
What is also very encouraging is their focus on banking the un(der)banked. They are launching a stablecoin basket starting with XSGD. As many of you know, stablecoins are currently mostly used for trading. However, Zilliqa is actively trying to broaden the use case of stablecoins. I recommend everybody to read this text that Amrit Kumar wrote (one of the co-founders). These stablecoins will be integrated in the traditional markets and bridge the gap between the crypto world and the traditional world. This could potentially revolutionize and legitimise the crypto space if retailers and companies will for example start to use stablecoins for payments or remittances, instead of it solely being used for trading.
 
Zilliqa also released their DeFi strategic roadmap (dating November 2019) which seems to be aligning well with their OpFi strategy. A non-custodial DEX is coming to Zilliqa made by Switcheo which allows cross-chain trading (atomic swaps) between ETH, EOS and ZIL based tokens. They also signed a Memorandum of Understanding for a (soon to be announced) USD stablecoin. And as Zilliqa is all about regulations and being compliant, I’m speculating on it to be a regulated USD stablecoin. Furthermore, XSGD is already created and visible on block explorer and XIDR (Indonesian Stablecoin) is also coming soon via StraitsX. Here also an overview of the Tech Stack for Financial Applications from September 2019. Further quoting Amrit Kumar on this:
 
There are two basic building blocks in DeFi/OpFi though: 1) stablecoins as you need a non-volatile currency to get access to this market and 2) a dex to be able to trade all these financial assets. The rest are build on top of these blocks.
 
So far, together with our partners and community, we have worked on developing these building blocks with XSGD as a stablecoin. We are working on bringing a USD-backed stablecoin as well. We will soon have a decentralised exchange developed by Switcheo. And with HGX going live, we are also venturing into the tokenization space. More to come in the future.”*
 
Additionally, they also have this ZILHive initiative that injects capital into projects. There have been already 6 waves of various teams working on infrastructure, innovation and research, and they are not from ASEAN or Singapore only but global: see Grantees breakdown by country. Over 60 project teams from over 20 countries have contributed to Zilliqa's ecosystem. This includes individuals and teams developing wallets, explorers, developer toolkits, smart contract testing frameworks, dapps, etc. As some of you may know, Unstoppable Domains (UD) blew up when they launched on Zilliqa. UD aims to replace cryptocurrency addresses with a human readable name and allows for uncensorable websites. Zilliqa will probably be the only one able to handle all these transactions onchain due to ability to scale and its resulting low fees which is why the UD team launched this on Zilliqa in the first place. Furthermore, Zilliqa also has a strong emphasis on security, compliance, and privacy, which is why they partnered with companies like Elliptic, ChainSecurity (part of PwC Switzerland), and Incognito. Their sister company Aqilliz (Zilliqa spelled backwards) focuses on revolutionizing the digital advertising space and is doing interesting things like using Zilliqa to track outdoor digital ads with companies like Foodpanda.
 
Zilliqa is listed on nearly all major exchanges, having several different fiat-gateways and recently have been added to Binance’s margin trading and futures trading with really good volume. They also have a very impressive team with good credentials and experience. They dont just have “tech people”. They have a mix of tech people, business people, marketeers, scientists, and more. Naturally, it's good to have a mix of people with different skill sets if you work in the crypto space.
 
Marketing & Community
 
Zilliqa has a very strong community. If you just follow their Twitter their engagement is much higher for a coin that has approximately 80k followers. They also have been ‘coin of the day’ by LunarCrush many times. LunarCrush tracks real-time cryptocurrency value and social data. According to their data it seems Zilliqa has a more fundamental and deeper understanding of marketing and community engagement than almost all other coins. While almost all coins have been a bit frozen in the last months, Zilliqa seems to be on its own bull run. It was somewhere in the 100s a few months ago and is currently ranked #46 on CoinGecko. Their official Telegram also has over 20k people and is very active, and their community channel which is over 7k now is more active and larger than many other official channels. Their local communities) also seem to be growing.
 
Moreover, their community started ‘Zillacracy’ together with the Zilliqa core team ( see www.zillacracy.com ). It’s a community run initiative where people from all over the world are now helping with marketing and development on Zilliqa. Since its launch in February 2020 they have been doing a lot and will also run their own non custodial seed node for staking. This seed node will also allow them to start generating revenue for them to become a self sustaining entity that could potentially scale up to become a decentralized company working in parallel with the Zilliqa core team. Comparing it to all the other smart contract platforms (e.g. Cardano, EOS, Tezos etc.) they don't seem to have started a similar initiatives (correct me if I’m wrong though). This suggest in my opinion that these other smart contract platforms do not fully understand how to utilize the ‘power of the community’. This is something you cannot ‘buy with money’ and gives many projects in the space a disadvantage.
 
Zilliqa also released two social products called SocialPay and Zeeves. SocialPay allows users to earn ZILs while tweeting with a specific hashtag. They have recently used it in partnership with the Singapore Red Cross for a marketing campaign after their initial pilot program. It seems like a very valuable social product with a good use case. I can see a lot of traditional companies entering the space through this product, which they seem to suggest will happen. Tokenizing hashtags with smart contracts to get network effect is a very smart and innovative idea.
 
Regarding Zeeves, this is a tipping bot for Telegram. They already have 1000s of signups and they plan to keep upgrading it for more and more people to use it (e.g. they recently have added a quiz features). They also use it during AMAs to reward people in real time. It’s a very smart approach to grow their communities and get familiar with ZIL. I can see this becoming very big on Telegram. This tool suggests, again, that the Zilliqa team has a deeper understanding what the crypto space and community needs and is good at finding the right innovative tools to grow and scale.
 
To be honest, I haven’t covered everything (i’m also reaching the character limited haha). So many updates happening lately that it's hard to keep up, such as the International Monetary Fund mentioning Zilliqa in their report, custodial and non-custodial Staking, Binance Margin, Futures & Widget, entering the Indian market, and more. The Head of Marketing Colin Miles has also released this as an overview of what is coming next. And last but not least, Vitalik Buterin has been mentioning Zilliqa lately acknowledging Zilliqa and mentioning that both projects have a lot of room to grow. There is much more info of course and a good part of it has been served to you on a silver platter. I invite you to continue researching by yourself :-) And if you have any comments or questions please post here!
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Ethereum Programming with solidity: A Complete Developer ‘s Guide

Ethereum Programming with solidity: A Complete Developer ‘s Guide
https://preview.redd.it/quh957s3k0851.jpg?width=2400&format=pjpg&auto=webp&s=87165ae7489eac21d9981c91ef462e73ab5be415
Have you ever heard about Ethereum with solidity programming? There is no doubt that the demand for Certified Solidity Developer is increasing day by day. ethereum solidity certification online course provides the practical process of deploying and building an application based on decentralized technology using Ethereum and solidity.
Ethereum programming with solidity is a programming course that is designed to upgrade your journey from theory to practical implementation. Here in this blog, we will discuss Ethereum with solidity programming.
What is Ethereum?
Ethereum is a type of cryptocurrency like bitcoin. Ethereum blockchain was designed to help programmers to develop applications that can transfer money from one party or another. Ethereum is a full-fledged platform for generating smart contracts. EVM i.e. Ethereum virtual machine make the production of decentralized applications much easier. Ethereum virtual machine permits Ethereum components to execute and reserve information in exchange for payment.
A Certified Ethereum Expert has a detailed understanding of how smart contracts are developed on the Ethereum blockchain platform.
What is Solidity?
Solidity is a programming language for coding smart contracts that was introduced in 2014. Solidity is one of the main Ethereum programming languages. Solidity language is basically designed to hence EVM. The syntax of the solidity programming language is similar to javascript. Solidity coding can be used to produce machine language programs that can be implemented on the Ethereum virtual machine. The solidity compiler breaks down the high-level of code into simple instructions. Solidity platform also supports the inheritance concept in object-oriented language. With solidity language, you can even develop applications that can imitate a crowd finding, a loan, a lottery and much more.
Ethereum Programming With Solidity
Ethereum Solidity is a high level and contracts oriented language. Solidity language is used for executing smart contract technology on several blockchain platforms. Solidity basically implements and develop the code in the EVM i.e. Ethereum virtual machine. In Ethereum, smart contracts are programmed in solidity language. ethereum blockchain certification course is unique, vigorous and consistently developing with advanced iterations of blockchain technology. Let’s take a look at the guide for Ethereum coding with solidity language.
· Smart Contracts
A simple smart contract in the sense of solidity language is a group of programs (i.e. functions) and data (i.e. state) that occupies a particular address on the Ethereum platform.
· Ethereum Virtual Machine
EVM or Ethereum virtual machine is the runtime domain for smart contracts in Ethereum blockchain. The operating program of the Ethereum virtual machine has no authority over the processes, networks and file systems. The three areas of Ethereum virtual machine where it can research information are such as memory, storage and stack.
· Storage — Each account has an area for information which is known as storage, which is constant between transactions and function calls. Storage is also known as a key value store for Ethereum virtual machine. A simple contract can neither write nor read to any other storage except its own.
· Memory — Memory is the second data area, of which contracts derives an instance for message call. Memory can be addressed at a byte level.
· Stack — All the computations are calculated on an area of data which is known as a stack. The Ethereum virtual machine is not a register machine. The maximum size of the stack is 1024 elements. The maximum word limit is 256 bits.
· Transactions
A transaction is a kind of message that is dispatched from one account to another. The transaction might be empty or the same. A message can include binary information. If the target contains code then the code is implemented and input data is provided as a payload.
· Message Calls
Contracts can send Ether to other accounts or can call each other through message calls. Message calls have a target, a source, Ether, Return data, gas and data payload. Message calls are like transactions. The maximum calls are restricted to a depth of 1024.
Final thoughts
In certified blockchain Expert ethereum, you will learn how to develop a decentralized application using Ethereum blockchain. If you wish to work with smart contracts and Ethereum then you should learn solidity language.
If you want to explore more about Ethereum programming with solidity, then you can check out Blockchain Council.
submitted by Blockchain_org to BlockchainStartups [link] [comments]

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