github.com/josetom/blockchain

Go Chain !

A simple blockchain built with inspiration from geth

Story

Supported

• Genesis
  • Initializes blockchain from genesis.json
  • creates block 0 from genesis.json data
• State
• Transactions
• Hashing
• Blocks
  • Validate blocks
  • Mine blocks
• Http Server
• Node
  • Peers
  • Sync
• Wallets
• LevelDB
  • Stores the blocks against hash
  • Has an index to point block number against hash. Iterator is run on this index

Todo

• Websockets
• GRPC
• Concurrency checks
• Proof of stake
• Incoming longer block
• Persist State
• Misc items
  • Transactions
    • Block txn from zero address
    • Increment txn nonce for signer
  • Wallet
    • Import private key
  • Signer
    • Implement better way to sign the transactions
  • Node
    • Node Version
    • Sync should happen only after the blocks are synced first time
  • Miner
    • Isolate miner from regular nodes
• ...??
• Fix TODO comments

Development

go build ./cmd/go-chain/...
./go-chain --help

Testing

go test -coverprofile=coverage.out ./...
go tool cover -html=coverage.out
go tool cover -func coverage.out | grep total | awk '{print substr($3, 1, length($3)-1)}'

Quick hacks

If you want to view database files

mkdir .database
cd ~/Libaray
ln -s ../../pet-project/blockchain/.database go-chain

Demo

Run console

./go-chain run

Create Wallet

./go-chain wallet new-account
./go-chain wallet print-pk --address="0xdd6b4d532aad2814bf5ea2bcc5e8939294857e6c"

Add Txn

Chain console should be running when transaction commands are called

./go-chain  tx add --from="0xdd6b4d532aad2814bf5ea2bcc5e8939294857e6c" --to="0x054b08ac0c3233efe965a6f24071de1353955e59" --value=50 --data="test"