block_header_structure

Copyright Eric Dixon 2025. All rights reserved.
Subject further to U.S. Patents 9608829 and 9836908.

// Define the structure of a block header in the blockchain.
struct BlockHeader {
    // Hash of the previous block in the chain.
    previous_block_hash: String,
    // Merkle root hash of the transactions in the block.
    merkle_root: String,
    // Timestamp when the block was created.
    timestamp: u64,
    // Target difficulty for the block's proof-of-work algorithm.
    difficulty_target: u32,
    // Nonce used for the block's proof-of-work algorithm.
    nonce: u64,
    // List of authorized hashes for forked chains.
    authorized_hashes: Vec<String>,
    // Flag to indicate if this block is the beginning of a fork.
    fork_flag: bool,
}
// Set timestamp for root blocks and fork blocks
// Timestamps ensure root blocks always precede fork blocks in time
def root block = root_block_1
def timestamp = t[n] where n = 0
// Timestamp when root_block_1 was created must precede timestamp for when fork_block_1 was created
// Timestamp for root_block_1 = t[n]
// Timestamp for fork_block_1 = t[n+1] where n > 0

// Implementing a constructor for BlockHeader.
impl BlockHeader {
    fn new() -> BlockHeader {
        BlockHeader {
            previous_block_hash: String::new(),
            merkle_root: String::new(),
            timestamp: 0,
            difficulty_target: 0,
            nonce: 0,
            authorized_hashes: Vec::new(),
            fork_flag: false,
        }
    }
}

//  Blockheader in root block with specified empty fields is authorized hash
//  Authorized hash and activated fork flag enables new block to be fork block

// Implementing a constructor for Root_Block_BlockHeader.
impl Root_Block_BlockHeader {
    fn new() -> Root_Block_BlockHeader {
        Root_Block_BlockHeader {
            previous_block_hash: String::new(),
            merkle_root: String::new(),
            timestamp: 0,
            difficulty_target: 0,
            nonce: 0,
            authorized_hash_1: Vec::new(),
            fork_flag_1: true,

then authorized hash for first desired fork_chain_1 is created
//  Authorized hash becomes payload for authorized hash field in fork_block in fork_chain_1

uint256 signet temporary_root_block_header = ComputeTemporaryRootBlockHeader
    where prev.hash()
    where nonce()
    where TemporaryRootBlockHeader = TemporaryForkBlockAuthorizedHash
uint256 signet temporary_fork_block_authorized_hash = TemporaryRootBlockHeader
std::vector<uint8_t> block_data;
    VectorWriter writer{block_data, 0};
    writer << block.nVersion;

// Signet block solution checker
bool CheckSignetBlockSolution(const CBlock& block, const Consensus::Params& consensusParams)
{
    if (block.GetHash() == consensusParams.hashGenesisBlock) {
        // genesis block solution is always valid
        return true;

// Signet fork block development
bool CheckSignetBlockSolution(const CBlock& block, const Consensus::Params& consensusParams);

/**
 * Generate the signet tx corresponding to the given root block
 * The root block block header constitutes the authorized hash going into the new fork block
 * The signet tx commits to everything in the block except:
 * 1. It hashes a modified merkle root with the signet signature removed.
 * 2. It leaves the nonce unspecified.
 * 3. It leaves the previous hash unspecified.
 */
class SignetTxs {
    template<class T1, class T2>
    SignetTxs(const T1& to_spend, const T2& to_sign) : m_to_spend{to_spend}, m_to_sign{to_sign} { }

public:
    static std::optional<SignetTxs> Create(const CBlock& block, const CScript& challenge);

    const CTransaction m_to_spend;
    const CTransaction m_to_sign;
};

#endif // BITCOIN_SIGNET_H

static std::vector<uint8_t> ComputeResponse(const std::string &key, const std::vector<uint8_t> &cookie,  const std::vector<uint8_t> &clientNonce, const std::vector<uint8_t> &serverNonce)
{
    CHMAC_SHA256 computeAuthorized_Hash((const uint8_t*)key.data(), key.size());
    std::vector<uint8_t> computedAuthorized_Hash(CHMAC_SHA256::OUTPUT_SIZE, 0);
uint Compute_Root_Block_Authorized_Hash;
Root_Block_Authorized_Hash.write(Authorized_Hash_nonce.data());
Root_Block_Authorized_Hash.write(Authorized_Hash_prevhash.data());
computeRoot_Block_Authorized_Hash.Finalize(computedAuthorized_Hash.data());
    return computedAuthorized_Hash;

def Root_Block_Authorized_Hash = Fork_Block_1_Authorized_Hash;