#NewsTrade The Bitcoin code is open source and available on GitHub. Below, I show you simplified snippets of the actual Bitcoin Core code (in C++), focused on key aspects of the algorithm:

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1. Generation of a block hash (double SHA-256)

In Bitcoin, each block is identified by a double SHA-256 hash (that is, SHA-256 is applied twice). This snippet represents that process:

#include

uint256 Hash(const std::vector& data) {

unsigned char hash1[SHA256_DIGEST_LENGTH];

SHA256(data.data(), data.size(), hash1);

unsigned char hash2[SHA256_DIGEST_LENGTH];

SHA256(hash1, SHA256_DIGEST_LENGTH, hash2);

return uint256(hash2); // final block hash

}

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2. Mining process: proof of work

This snippet represents a mining loop: it tests different nonce values until a valid hash is found with a certain number of leading zeros.

while (true) {

block.nNonce++;

uint256 hash = block.GetHash(); // applies double SHA-256 internally

if (hash < target) { // target is the current difficulty

// Valid block found!

break;

}

}

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3. Validation of a transaction

This checks if a transaction is valid (very simplified summary):

bool CheckTransaction(const CTransaction& tx) {

if (tx.vin.empty() || tx.vout.empty()) return false; // required inputs and outputs

// check that output values are not negative

for (const auto& out : tx.vout) {

if (out.nValue < 0) return false;

}

return true;

}

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