In Memory Blockchain

It's a single node blockchain demonstration. Without network or p2p connections, also no signature or verification. All blockchain data store in memory. The consensus would be straightforward: just collect transactions and make them blocks.

SPECIFICATION

• It is an account based blockchain.
• Newly observed accounts have 100 units of initial coins.
• The blockchain generates a new block every 10 seconds.
• Block header has the following message
  • Block hash: SHA256 hash of block.
  • Parent hash: Previous block hash.
  • Block height.
  • Transactions: Array of transaction hashes belong to this block.
• Transaction has the following message:
  • Transaction hash: SHA256 hash of transaction.
  • From: from address.
  • To: to address.
  • Value: coins to transaction.
• REST API to input transaction and further interaction
• Dump blockchain log on console.

How to run

1. Install npm packages

npm install

1. Start node

npm start

Node interaction

After node start. Use curl command to interact with.

Transaction

1. Create transaction. A POST requst with from, to and value parameters in request body. Response contains the same input data with additional txhash.

curl --header "Content-Type: application/json" \
  --request POST \
  --data '{"from":"acc1", "to":"acc2","value":3}' \
  http://localhost:3000/transaction

2. Get transaction by txhash. A GET request with hash parameter.

curl -X GET "localhost:3000/transaction/0x4f7d1b75053426c78e6a51a0ebae18f805d61e67be6699df36ed77afeb13e8f6"

Address

1. Get address info. A GET request with address parameter.

curl -X GET localhost:3000/address/acc1

Block

1. Get current blockchain height. A GET request.

curl -X GET localhost:3000/block

2. Get block info by height. A GET request with height parameter.

curl -X GET localhost:3000/block/height/2

3. Get block info by block hash. A GET request with hash parameter.

curl -X GET localhost:3000/block/hash/0xb49437410bd457d6b680b0cb8f609163f00429200e614e12a6e0d9b6dbbb1f0c