Daniel's blockchain demo implemenation using rust
refer to https://hackernoon.com/learn-blockchains-by-building-one-117428612f46
cargo run
display chain
http GET http://localhost:8000/chain
http POST http://localhost:8000/transactions/new sender=a recipient=b amount:=3.0
http GET http://localhost:8000/mine
create a new transaction
http GET http://localhost:8000/mine
mine a new block and add all pending transactions
http GET http://localhost:8000/mine