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@dvf dvf/blockchain.py
Last active Jun 29, 2019

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Step 8: The Mining Endpoint
import hashlib
import json
from time import time
from uuid import uuid4
from flask import Flask, jsonify, request
...
@app.route('/mine', methods=['GET'])
def mine():
# We run the proof of work algorithm to get the next proof...
last_block = blockchain.last_block
last_proof = last_block['proof']
proof = blockchain.proof_of_work(last_proof)
# We must receive a reward for finding the proof.
# The sender is "0" to signify that this node has mined a new coin.
blockchain.new_transaction(
sender="0",
recipient=node_identifier,
amount=1,
)
# Forge the new Block by adding it to the chain
previous_hash = blockchain.hash(last_block)
block = blockchain.new_block(proof, previous_hash)
response = {
'message': "New Block Forged",
'index': block['index'],
'transactions': block['transactions'],
'proof': block['proof'],
'previous_hash': block['previous_hash'],
}
return jsonify(response), 200
@Niedzwiedzw

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commented Jan 13, 2018

What's node_identifier

@d2718nis

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commented Jul 26, 2018

The node_identifier defined a little bit earlier at the Step 6: Setting up Flask. Briefly, it's a unique identifier of the node (aka the miner) which successfully produced a new block: solved the mathematical problem known as proof of work. It will be rewarded with 1 coin of revenue at this example.

You could get more info regarding the mining process here: https://en.bitcoin.it/wiki/Mining#Reward

@william0353

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commented Mar 21, 2019

I got an error: Flask not found

from flask import Flask, jsonify, request
ModuleNotFoundError: No module named 'flask'

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