README1.md

golang-blockchain

Building a blockchain in Go from scratch walkthrough part 1

1. go mod init github.com/monkrus/golang-blockchain.git

2. Create a Block struct (Hash, Data, PrevHash)

3. Write a method to create a hash based on the previous hash.

4. We join the 2-dimensional array into one

5. Create an actual hash on info

6. Take created hash and push it into the hash field of the block NOTE! [:] is a slice referencing to the whole array)

7. NOTE! SHA256 is really simple comparing to the real way to calculate a hash in the blockchain

8. Write a function to create an actual block

9. Create a blockchain type

10. Write a method to add block to the chain

• create a previous block
• create a new block
• append new block

10. Write a function to create a genesis block

11. Write a function to initialize blockchain

• create an array of blocks using genesis block

12. Put functions into the main function

• intialization, adding blocks etc.

13. Run a for loop to see the blockchain

14. RUN go run main.go

Building a blockchain in Go from scratch walkthrough part 2

1. Clean up:

• create blockchain folder with block.go inside of it
• rename package main into package blockchain
• make blocks field public by replacing it with Blocks
• add github.com/monkrus/golang-blockchain to import in main.go
• please note main.go will now have less lines of code

2. Create proof.go

3. Set up difficulty

4. Create ProofOfWork struct

5. Create function NewProof

• create a target
• NOTE! One of our hashes has 256 bytes
• NOTE! left shift is the same as multiplication by 2
• << is used for "times two" and >> is for "divided by two"

6. Create a ToHex utility function

7. Modify CreateBlock function

8. Delete DeriveHash function

9. Create Validate method

10. Add POW to main.go