This repository is based on the article Learn Blockchains by Building One. I basically used golang to reimplement the contents of the article.

You can create a multi-node blockchain using the code and can understand

• how transactions are added to the block
• how blocks are added to the chain
• how nodes communicate with each other to resolve conflict and reach consensus

To run multiple nodes:

go run main.go :8080
go run main.go :8081

List of APIs:

$ curl localhost:8080/chain
$ curl localhost:8080/mine
$ curl localhost:8080/transactions/new -d \
'{"sender":"exampleSender", "recipient": "exampleRecipient", "amount":1}'
$ curl localhost:8080/nodes/register -d \
'{"Nodes": "localhost:8081"}'
$ curl localhost:8080/nodes/resolve

Run multiple nodes

$ go run main.go :8080
$ go run main.go :8081

Register the node

$ curl localhost:8080/nodes/register -d \
'{"Nodes": "localhost:8081"}'

Mine on the second node

$ curl localhost:8081/mine

The second chain should be longer than the first chain now. Resolve the conflict.

$ curl localhost:8080/nodes/resolve