title: Blockchain! Blockchain! Blockchain! - Build Your Own Blockchains in Go from Zero (Scratch)

Alchemy - How-To Mine Digital Schilling? How-To Turn Digital Bits Into $$$ or €€€?

Transactions (Hyper) Ledger Book

From	To	Amount
Grossklockner (†)	Sepp	3798
Grossvenediger (†)	Franz	3666
Dachstein (†)	Sissi	2995
Wildspitze (†)	Maria	3768

Sissi	Eva	20
Sepp	Maria	17
Franz	Sissi	3
Sepp	Ferdl	100

Franz	Max	17
Maria	Adam	4

(†): Miner Transaction - New Schilling on the Market!

(Source: bitshilling/bitshilling)

Blockchain! Blockchain! Blockchain! Decentralize Payments. Decentralize Transactions. Decentralize Blockchains.

What's Blockchain?

Distributed Database?
Hyper Ledger Book?
Consensus with Proof-of-Work or Proof-of-Stake?
Digital Fingerprints? Cryptographic Hashes?
Lottery? Central Bank?
Byzantine-Generals Solution?

Yes. Yes. Yes. Blockchain! Blockchain! Blockchain!

(Source: openblockchains/whatsblockchain)

The Proof of the Pudding is ... The Bitcoin (BTC) Blockchain(s)

A Success Story on the Blockchain.

May 22, 2010 - World's 1st Bitcoin Payment

A developer bought two pizzas using 10 000 Bitcoin (BTC) - a then-little-known digital (crypto)currency. Estimated worth about $40.

Triva Q: How much is one Bitcoin worth today? Q: How much are 10 000 Bitcoin worth today?

$20 Million Dollar Pizza Day - Celebrating the Birth of Bitcoin Alchemy - $$$

(Source: coinmarketcap.com/currencies/bitcoin)

Let's Build Your Own Blockchain in Go (From Zero / Scratch)

Crypto God? Go Ninja / Rockstar?

Yes, you can.

Code, Code, Code - A Blockchain in Go in 20 Lines! A Blockchain is a Data Structure

What's Blockchain?

It's a list (chain) of blocks linked and secured by digital fingerprints (also known as crypto hashes).

package main

import "..."

type Block struct {
  Timestamp int64       // seconds since (unix) epoch (1970-01-01)
  Data      string
  PrevHash  string
  Hash      string  
}


func calcHash( data string ) string {
  hashed := sha256.Sum256( []byte(data) )
  return binToStr( hashed[:] )   // note: [:] converts [32]byte to []byte
}


func NewBlock(data string, prevHash string) Block {
  timestamp := time.Now().Unix()
  hash      := calcHash( intToStr(timestamp) + prevHash + data )

  return Block { timestamp, data, prevHash, hash }
}

(Source: openblockchains/awesome-blockchains/blockchain.go)

Yes, that's it.

Code, Code, Code - A Blockchain in Go in 20 Lines! A Blockchain is a Data Structure (Cont.)

Let's get started - build a blockchain a block at a time!

func main() {

  b0 := NewBlock( "Hello, Cryptos!", "0000000000000000000000000000000000000000000000000000000000000000" )
  b1 := NewBlock( "Hello, Cryptos! - Hello, Cryptos!", b0.Hash )

  blockchain := []Block {b0, b1}
}

Code, Code, Code - A Blockchain in Go in 20 Lines! A Blockchain is a Data Structure (Cont.)

Wait, so a blockchain is just a linked list?

No. A linked list is only required to have a reference to the previous element, a block must have an identifier depending on the previous block's identifier, meaning that you cannot replace a block without recomputing every single block that comes after. In this example that happens as the previous digest is input in the calcHash method.

Will print something like:

fmt.Println( b0 )
// {1522687834 Hello, Cryptos!
//    0000000000000000000000000000000000000000000000000000000000000000
//    d85da0f449ff9ddc2c5ba638b23b9524381811227eb463b8c9e0be40dc1b1a8a}
fmt.Println( len( b0.Hash ))
// => 64
fmt.Println( len( b0.PrevHash ))
// => 64

fmt.Println( b1 )
// {1522687834 Hello, Cryptos! - Hello, Cryptos!
//     d85da0f449ff9ddc2c5ba638b23b9524381811227eb463b8c9e0be40dc1b1a8a
//     e48ba730165d88e15435483fc3a60714be526096a0c9a71ad10623340e33c7e3}
fmt.Println( len( b1.Hash ))
// => 64
fmt.Println( len( b1.PrevHash ))
// => 64

fmt.Println( blockchain )
// => [{1522687834 Hello, Cryptos!
//           0000000000000000000000000000000000000000000000000000000000000000
//           d85da0f449ff9ddc2c5ba638b23b9524381811227eb463b8c9e0be40dc1b1a8a}
//     {1522687834 Hello, Cryptos! - Hello, Cryptos!
//           d85da0f449ff9ddc2c5ba638b23b9524381811227eb463b8c9e0be40dc1b1a8a
//           e48ba730165d88e15435483fc3a60714be526096a0c9a71ad10623340e33c7e3}]

What about Proof-of-Work? What about Consensus?

Making (Hash) Mining a Lottery - Find the Lucky Number

hash := calcHash( intToStr(timestamp) + prevHash + data )

The computer (node) in the blockchain network that computes the next block with a valid hash wins the lottery.

For adding a block to the chain you get a reward! You get 25 12.5 Bitcoin! (†)

Bitcoin adds a block every ten minutes.

(†) The reward gets halfed about every two years. In Sep'17 you'll get 12.5 Bitcoin.

What about Proof-of-Work? What about Consensus? (Cont.)

Random SHA256 hash #1: c396de4c03ddb5275661982adc75ce5fc5905d2a2457d1266c74436c1f3c50f1

Random SHA256 hash #2: 493131e09c069645c82795c96e4715cea0f5558be514b5096d853a5b9899154a

Triva Q: What's SHA256?

(A) Still Hacking Anyway
(B) Secure Hash Algorithm
(C) Sweet Home Austria
(D) Super High Aperture

What about Proof-of-Work? What about Consensus? (Cont.)

A: SHA256 == Secure Hash Algorithms 256 Bits

Trivia: Designed by the National Security Agency (NSA) of the United States of America (USA).

Secure == Random e.g. Change one Letter and the Hash will Change Completely

Making (Hash) Mining a Lottery - Find the Lucky Number

Find a hash that starts with ten leading zeros e.g.

0000000000069645c82795c96e4715cea0f5558be514b5096d853a5b9899154a

Hard to compute! Easy to check / validate.

What about Proof-of-Work? What about Consensus? (Cont.)

Making (Hash) Mining a Lottery - Find the Lucky Number (Nonce)

Nonce == Number used once

func calcHash( data string ) string {
  hashed := sha256.Sum256( []byte(data) )
  return binToStr( hashed[:] )   // note: [:] converts [32]byte to []byte
}

func computeHashWithProofOfWork( data string ) (int64,string) {
  nonce := int64( 0 )
  for {
    hash := calcHash( intToStr(nonce) + data )
    if strings.HasPrefix( hash, "0000" ) {
        return nonce,hash    // bingo! proof of work if hash starts with leading zeros (0000)
    } else {
        nonce += 1           // keep trying (and trying and trying)
    }
  }
}

(Source: awesome-blockchains/blockchain_with_proof_of_work.go)

What about Proof-of-Work? What about Consensus? (Cont.)

Making (Hash) Mining a Lottery - Find the Lucky Number (Nonce)

Nonce == Number used once

type Block struct {
  Timestamp  int64       // seconds since (unix) epoch (1970-01-01)
  Data       string
  PrevHash   string
  Hash       string
  Nonce      int64       // number used once - lucky (mining) lottery number
}

func NewBlock( data string, prevHash string ) Block {
  timestamp   := time.Now().Unix()
  nonce, hash := computeHashWithProofOfWork( intToStr(timestamp) + prevHash + data )

  return Block { timestamp, data, prevHash, hash, nonce }
}

What about Proof-of-Work? What about Consensus? (Cont.)

Let's rerun the sample with the proof of work machinery added. Now the sample will print something like:

b0 := NewBlock( "Hello, Cryptos!", "0000000000000000000000000000000000000000000000000000000000000000" )
b1 := NewBlock( "Hello, Cryptos! - Hello, Cryptos!", b0.Hash )

fmt.Println( b0 )
// {1522691756 Hello, Cryptos!
//    0000000000000000000000000000000000000000000000000000000000000000
//    00009f597a8e28fc42a450c0ed2eff1b6507f76f6a7d1e112686700ce37e3676
//    42278}
fmt.Println( len( b0.Hash ))
// => 64
fmt.Println( len( b0.PrevHash ))
// => 64

fmt.Println( b1 )
// {1522691756 Hello, Cryptos! - Hello, Cryptos!
//     00009f597a8e28fc42a450c0ed2eff1b6507f76f6a7d1e112686700ce37e3676
//     00009ef5ea432f840c3fb23dbedb5cce4c72e2951a140c1289dda1fedbcd6e99
//     105106}

See the difference? All hashes now start with leading zeros (0000) and the nonces (e.g. 42278 or 105106) are the random "lucky numbers" that makes it happen. That's the magic behind the proof of work.

What's Your Hash Rate?

for factor := 1; factor++; factor <= 7  {
   difficulty := strings.Repeat( "0", factor )
   fmt.Printf( "\nDifficulty: %s (%d bits)\n", difficulty, len(difficulty)*4 )

   fmt.Println( "Starting search..." )
   t1 := time.Now()
   nonce, _ := computeHashWithProofOfWork( "Hello, Cryptos!", difficulty )
   t2 := time.Now()

   delta := t2.Sub( t1 )
   fmt.Printf( "Elapsed Time: %s, Hashes Calculated: %d\n", delta, nonce )

   if delta.Seconds() > 0.001 {
     hashrate := float64(nonce)/delta.Seconds()
     fmt.Printf( "Hash Rate: %d hashes per second\n", int64(hashrate))
   }
}

(Source: awesome-sha256/hashrate.go)

What's Your Hash Rate? (Cont.)

Prints:

Difficulty: 0 (4 bits)
Starting search...
Elapsed Time: 0s, Hashes Calculated: 56

Difficulty: 00 (8 bits)
Starting search...
Elapsed Time: 1.0001ms, Hashes Calculated: 143
Hash Rate: 142985 hashes per second

Difficulty: 000 (12 bits)
Starting search...
Elapsed Time: 5.0002ms, Hashes Calculated: 3834
Hash Rate: 766769 hashes per second

Difficulty: 0000 (16 bits)
Starting search...
Elapsed Time: 33.0019ms, Hashes Calculated: 26762
Hash Rate: 810923 hashes per second

Difficulty: 00000 (20 bits)
Starting search...
Elapsed Time: 137.0078ms, Hashes Calculated: 118592
Hash Rate: 865585 hashes per second

Difficulty: 000000 (24 bits)
Starting search...
Elapsed Time: 26.5378148s, Hashes Calculated: 21554046
Hash Rate: 812201 hashes per second

Triva Quiz: What's the Bitcoin Hash Rate?

A: About 25 million trillions of hashes per second (in April 2018)

Estimated number of tera hashes per second (trillions of hashes per second) the Bitcoin network is performing.

(Source: blockchain.info)

The World's Worst Database - Bitcoin Blockchain Mining

Uses approximately the same amount of electricity as could power an average American household for a day per transaction
Supports 3 transactions / second across a global network with millions of CPUs/purpose-built ASICs
Takes over 10 minutes to "commit" a transaction
Doesn't acknowledge accepted writes: requires you read your writes, but at any given time you may be on a blockchain fork, meaning your write might not actually make it into the "winning" fork of the blockchain (and no, just making it into the mempool doesn't count). In other words: "blockchain technology" cannot by definition tell you if a given write is ever accepted/committed except by reading it out of the blockchain itself (and even then)
Can only be used as a transaction ledger denominated in a single currency, or to store/timestamp a maximum of 80 bytes per transaction

(Source: Tony Arcieri - On the dangers of a blockchain monoculture)

Tulip Mania Quiz - Win 100 Schilling on the Blockchain!

Q: Tulip Mania Bubble in Holland - What Year?

(A) 1561
(B) 1637
(C) 1753
(D) 1817

Q: What's the Name of the Most Expensive Tulip?

(A) Admiral van Eijck
(B) Admiral of Admirals
(C) Semper Augustus
(C) Semper Cesarus

Tulips on the Blockchain! Adding Transactions

Learn by Example from the Real World (Anno 1637) - Buy! Sell! Hold! Enjoy the Beauty of Admiral of Admirals, Semper Augustus and More.

Transactions (Hyper) Ledger Book

From	To	What	Qty
Dutchgrown (†)	Vincent	Tulip Bloemendaal Sunset	10
Keukenhof (†)	Anne	Tulip Semper Augustus	7

Flowers (†)	Ruben	Tulip Admiral van Eijck	5
Vicent	Anne	Tulip Bloemendaal Sunset	3
Anne	Julia	Tulip Semper Augustus	1
Julia	Luuk	Tulip Semper Augustus	1

Bloom & Blossom (†)	Daisy	Tulip Admiral of Admirals	8
Vincent	Max	Tulip Bloemendaal Sunset	2
Anne	Martijn	Tulip Semper Augustus	2
Ruben	Julia	Tulip Admiral van Eijck	2

Teleflora (†)	Max	Tulip Red Impression	11
Anne	Naomi	Tulip Bloemendaal Sunset	1
Daisy	Vincent	Tulip Admiral of Admirals	3
Julia	Mina	Tulip Admiral van Eijck	1

Max	Isabel	Tulip Red Impression	2

(†): Grower Transaction - New Tulips on the Market!

(Source: openblockchains/tulips)

Tulips on the Blockchain! Adding Transactions (Cont.)

Quotes - Blockchains are the next Internets / Tulips

People who compare digital tokens to tulips are essentially saying digital tokens are a bubble backed by nothing but pure hype and speculation.

What they fail to understand is that tulips come from dirt, not a blockchain.

And as we all know, blockchain is possibly the best technological innovation since the internet. It will have a tremendous impact on global business and society in general. -- TulipToken

Tulips on the Blockchain! Adding Transactions (Cont.)

  to be done

Tulips on the Blockchain! Adding Transactions (Cont.)

resulting in:

   to be done

What's Blockchain Lite - Go Edition? (Upcoming)

blockchain-lite library (github: openblockchains/blockchain.lite.go - build your own blockchain with crypto hashes - revolutionize the world with blockchains, blockchains, blockchains one block at a time

Usage

Let's get started. Build your own blockchain one block at a time.

import(
   blk "github.com/openblockchains/blockchain.lite.go"
)

b0 := blk.NewBlock( "Hello, Cryptos!", "0000000000000000000000000000000000000000000000000000000000000000" )
b1 := blk.NewBlock( "Hello, Cryptos! - Hello, Cryptos!", b0.Hash )

blockchain := []Block {b0, b1}

fmt.Println( blockchain )

Case Study - Dutch Gulden on the Blockchain!

(Source: coinmarketcap.com/currencies/gulden)

Schilling! Schilling! on the Blockchain! Rock-Solid Alpine Dollar from Austria

Who's in? Invest now!

Crypto #Schilling on the #Blockchain in 197 Days 7 Hours 30 Minutes!

Join the Rock-Solid Alpine Dollar Movement!

Learn more @ bitshilling/bitshilling

What's Next? Beyond Currencies / Money

Crypto Collectibles - Non Fungible Tokens (NFTs) - Unique Bits & Bytes on the Blockchain

Fun, Fun, Fun - Blockchain Gambling Casinos
- Kitties, Puppies, Dragons, Lambos, ...
Assets, Deeds, Titles ,...
- Land, Houses, Apartments, ...
- Tickets, ...

CryptoKitties (Yes, Cute Little Cartoon Cats) on the Blockchain!

Collectible. Breedable. Adorable.

Collect and breed digital cats. Start meow. Buy! Sell! Hodl!

Fabulous Persian Spock Gerbil Gold Cottoncandy - Extremely rare gen 5 swift virgin | 2.9 ETH

Rarity: 0.00264% Gen 5 JAGUAR FABULOUS GOLD DALI!! VIRGIN!

Rarity: 0.0015% Princess Bubblegum is now for sale! Gen 12 | Brisk | Virgin | Chartreux | Bubblegum | Otaku | Emeraldgreen | Saycheese | Mauveover | Spock - Starts ETH 20/Ends ETH 10

Gold ducat, Gen 5, Virgin, Swift. Very cheap

Cheap Gen 1 cute kittie with rare genes! Only 0.125 ETH

UNIQUE Virgin Peach Googly Gold Mauveover gen:2 cooldown:1 0.87992% RARE

SUPER CHEAP: Gerbil, Ragdoll, Scarlet, Chestnut, Cotton Candy!!! 0.02 ETH (~$14)

I'm giving away a Gen 1 FAST Gold for free...

-- CrypoKittiesMarket

Learn more @ cryptokitties.co

CryptoKittes & CryptoCollectibles - Buy! Sell! Hodl!

Awesome CryptoKitties @ CryptoCopycats
Awesome CryptoCollectibles (& Assets) @ CryptoCopycats

Awesome Blockchains @ Open Blockchains

A collection about awesome blockchains - open distributed public databases w/ crypto hashes incl. git ;-). Blockchains are the new tulips. Distributed is the new centralized.

More @ openblockchains/awesome-blockchains

Articles - Build / Code Your Own Blockchains from Scratch (Zero) in Go

Build / Code Your Own Blockchains in Go Series by Ivan Kuznetsov

Part 1: Basic Prototype
Part 2: Proof-of-Work
Part 3: Persistence and CLI
Part 4: Transactions 1
Part 5: Addresses
Part 6: Transactions 2
Part 7: Network

Build / Code Your Own Blockchain in Go Series by Coral Health

Part 1: Code your own blockchain in less than 200 lines of Go!
Part 2: Blockchain networking
Code your own blockchain mining algorithm!
Learn how to store data through the blockchain using IPFS
Code your own proof of stake algorithm!

and others.

Austrian Blockchain Token Whitepapers - Free Easy Money - Scam Alert

Thanks for your money! Thanks for holding the bag!

More @ austriacodes/blockchain-whitepapers

Austrian Blockchain Token Case Study - Hero (PLAY) by Byte Heroes

Token: Ethereum #20

by Byte Heroes, Praterstraße 1/3 Space 32, 1020 Vienna, Austria

More @ austriacodes/blockchain-whitepapers

Austrian Blockchain Token Case Study - Crowd (CRWD) by Conda Austria

by Conda, Donau-City-Straße 6, 1220 Vienna, Austria

Buyer beware! If it sounds too good to be true, - surprise, surprise - it is. The Future is Bright! Free Easy Money Bullshit (BS) Example - Early Investors are making 50 000% returns on ICOs by Coin and Crypto.

Early investment is paying off big time

The average return on the S&P is 10%. Over the last year bitcoin has seen unprecedented returns of 1000%. But savvy cryptocurrency investors are investing in initial coin offerings (ICOs) and making return on investments (ROIs) as high as 50 000%. Stop and think about that for a moment. That means for a $100 investment in early 2017 you could have netted $50 000. Not too shabby for a year of trading.

[..]

The majority of startups fail, even well funded ones, so be prepared to lose [all] what you invest [gamble], even if the landscape is optimistic. [To the moon! Thanks for your money and hodling the bag!]

More @ austriacodes/blockchain-whitepapers

Austrian Blockchain Token Case Study - Pandos (PAN) by Bitpanda

by Pantos, Burggasse 116/3+3A, 1070 Vienna, Austria

Future-Proof!? For ALL Blockchains!? -- Q: Just wondering - Can you predict the future? How many blockchains are out there now (and in the future)?

More @ austriacodes/blockchain-whitepapers

Q: What's a Token Sale Scam?

A: If you buy these digital tokens (on the blockchain) giving free money as a donation / gift to a company to revolutionize the world one block at a time than everything is ok.

If you buy these digital token (on the blockchain) trying to get rich (quick) by selling them at a higher price to a greater fool than - surprise, surprise - you're getting scammed.

Let's quote the fineprint from the "Legal FAQ" from the most serious / reputable token sale, that is, Pantos by Bitpanda:

Pantos - in whatever form – do NOT represent a claim on or against Bitpanda. Bitpanda may decide NOT to exchange Pantos - in whatever form - at ANY time at their sole discretion. [Thanks for the free money and holding the bag!]

-- Source: Pantos Legal FAQ

The point is ... you own binary bits (on the blockchain) and the value is ... excactly zero. You say? Wait, but the token value is not (yet) excactly zero. HODL! HODL! How much richer are you today?

Ask yourself why should the company work hard, hard, hard to make you rich, rich, rich when - surprise, surprise - the company already collected all the free money from greater fools and - surprise, surprise - you have zero legal claim to anything. Welcome to the world of business! Buyer beware!

More @ austriacodes/blockchain-whitepapers

Bonus: Blockchain Books

Attack of the 50 Foot Blockchain: Bitcoin, Blockchain, Ethereum & Smart Contracts by David Gerard, London, 2017 -- What is a bitcoin? ++ The Bitcoin ideology ++ The incredible promises of Bitcoin! ++ Early Bitcoin: the rise to the first bubble ++ How Bitcoin mining centralised ++ Who is Satoshi Nakamoto? ++ Spending bitcoins in 2017 ++ Trading bitcoins in 2017: the second crypto bubble ++ Altcoins ++ Smart contracts, stupid humans ++ Business bafflegab, but on the Blockchain ++ Case study: Why you can’t put the music industry on a blockchain

Mastering Bitcoin - Programming the Open Blockchain 2nd Edition, by Andreas M. Antonopoulos, 2017 - FREE (Online Source Version) -- What Is Bitcoin? ++ How Bitcoin Works ++ Bitcoin Core: The Reference Implementation ++ Keys, Addresses ++ Wallets ++ Transactions ++ Advanced Transactions and Scripting ++ The Bitcoin Network ++ The Blockchain ++ Mining and Consensus ++ Bitcoin Security ++ Blockchain Applications

Blockchain for Dummies, IBM Limited Edition by Manav Gupta, 2017 - FREE (Digital Download w/ Email) -- Grasping Blockchain Fundamentals ++ Taking a Look at How Blockchain Works ++ Propelling Business with Blockchains ++ Blockchain in Action: Use Cases ++ Hyperledger, a Linux Foundation Project ++ Ten Steps to Your First Blockchain application

The Truth Machine: The Blockchain and the Future of Everything by Paul Vigna and Michael J. Casey, New York, 2018 -- A SocietyBuilding Tool ++ The God Protocol ++ Governing the Digital Economy ++ Enabling the Fourth Industrial Revolution ++ The Old Guards New Makeover ++ A SelfSovereign Identity ++ A New Constitution for the Digital Age

Bonus: Git, Git, Git - The Stupid Content Tracker with Crypto Hashes

Everything is local. Distributed is the new centralized.

Yep, that's the joke. Nobody has been able to explain to me how the "blockchain" buzzword is significantly different to "git repo". -- Yaakov

But if you said "let's build a currency where all transactions are stored in a git repo" you wouldn't be taken seriously for even 24 hrs. -- Yaakov

Soon explaining git like "a git repo is like a blockchain with commits instead of blocks". -- Nicolás Berger

"A local branch is like a state channel. It can be pushed and merged into the master blockchain at any moment." -- Nicolás Berger

The #Blockchain has changed the world. Here I make the argument that the #Blockchain is just like #git. -- Jackson Kelley

git merge [-m REF] [-g BLOB] --push Merge and push all signed commits to the blockchain. -- Git Commands

Files

blockchain_go.md

Latest commit

History

blockchain_go.md

File metadata and controls

Alchemy - How-To Mine Digital Schilling? How-To Turn Digital Bits Into $$$ or €€€?

Blockchain! Blockchain! Blockchain! Decentralize Payments. Decentralize Transactions. Decentralize Blockchains.

The Proof of the Pudding is ... The Bitcoin (BTC) Blockchain(s)

$20 Million Dollar Pizza Day - Celebrating the Birth of Bitcoin Alchemy - $$$

Let's Build Your Own Blockchain in Go (From Zero / Scratch)

Code, Code, Code - A Blockchain in Go in 20 Lines! A Blockchain is a Data Structure

Code, Code, Code - A Blockchain in Go in 20 Lines! A Blockchain is a Data Structure (Cont.)

Code, Code, Code - A Blockchain in Go in 20 Lines! A Blockchain is a Data Structure (Cont.)

What about Proof-of-Work? What about Consensus?

What about Proof-of-Work? What about Consensus? (Cont.)

What about Proof-of-Work? What about Consensus? (Cont.)

What about Proof-of-Work? What about Consensus? (Cont.)

What about Proof-of-Work? What about Consensus? (Cont.)

What about Proof-of-Work? What about Consensus? (Cont.)

What's Your Hash Rate?

What's Your Hash Rate? (Cont.)

Triva Quiz: What's the Bitcoin Hash Rate?

The World's Worst Database - Bitcoin Blockchain Mining

Tulip Mania Quiz - Win 100 Schilling on the Blockchain!

Tulips on the Blockchain! Adding Transactions

Tulips on the Blockchain! Adding Transactions (Cont.)

Tulips on the Blockchain! Adding Transactions (Cont.)

Tulips on the Blockchain! Adding Transactions (Cont.)

What's Blockchain Lite - Go Edition? (Upcoming)

Case Study - Dutch Gulden on the Blockchain!

Schilling! Schilling! on the Blockchain! Rock-Solid Alpine Dollar from Austria

What's Next? Beyond Currencies / Money

CryptoKitties (Yes, Cute Little Cartoon Cats) on the Blockchain!

CryptoKittes & CryptoCollectibles - Buy! Sell! Hodl!

Awesome Blockchains @ Open Blockchains

Articles - Build / Code Your Own Blockchains from Scratch (Zero) in Go

Austrian Blockchain Token Whitepapers - Free Easy Money - Scam Alert

Austrian Blockchain Token Case Study - Hero (PLAY) by Byte Heroes

Austrian Blockchain Token Case Study - Crowd (CRWD) by Conda Austria

Austrian Blockchain Token Case Study - Pandos (PAN) by Bitpanda

Q: What's a Token Sale Scam?

Bonus: Blockchain Books

Bonus: Git, Git, Git - The Stupid Content Tracker with Crypto Hashes