BITS F452 Blockchain Technology

Programming_Assignment_1

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Dexter’s Blockchain

Team

• Abhilash Gahankari - 2020H1030113H
• Aashita Dutta - 2020H1030130H
• Satish Phale - 2020H1030155H

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Functions

• Dexter has information regarding all the available blocks - add_block()
• None of Dexter's friends should be able to edit the added transactions - compute_hash(), mine() (Immutable and secured)
• Timestamp of each transaction is readily available - CreateBlock, AddNewTransaction
• Dexter should have all the information regarding the completed transactions - mine(), ProofOfWork(), ValidProof()

Details

• A Block has an index, timestamp, list of transactions, HashValue of previous block, nonce
• Add new transactions to block with new_transaction
• Add genesis block to chain and hash it and create chain
• add_blcok will add the new block with information to the pending_transactions.(unconfirmed pool)
• Moving transactions from unconfirmed pool to confirmed pool after mining performing proof of work and after consensus from other miners, the block is added to confirmed transactions.

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Working

*** To start the server***:

python blockchain.py

Following API's are available:

(one can use the postman or curl to hit these api).

• curl 127.0.0.1:5000/chain - to see chain (GET)
• curl 127.0.0.1:5000/pending_transactions - to see unconfirmed transactions (GET)
• curl 127.0.0.1:5000/mine - to compute transactions (GET)

• curl -X POST -H "Content-Type: application/json" -d '{  
    "author": "test1",
    "content": "test2"}' "http://localhost:5000/new_transaction" 
  

  to add new transaction/block (POST)

To create the new block, a json object with author and content have to be passed.(example for curl is given above. In the postman, POST request with body as above will also work.)

sequence

1. To see empty chain, check 127.0.0.1:5000/chain
2. To add new block/transaction, use POST method http://localhost:5000/new_transaction
3. To see unconfirmed transactions, use curl 127.0.0.1:5000/pending_transactions
4. To move unconfirmed transactions to confirmed chain, use curl 127.0.0.1:5000/mine
5. To see the new chain, use 127.0.0.1:5000/chain