Module wire 

Bitcoin P2P wire format serialization

Implements Bitcoin P2P protocol message framing: Format: [magic:4][command:12][length:4][checksum:4][payload:var]

• Magic bytes: Network identifier (mainnet, testnet, etc.)
• Command: 12-byte ASCII string (null-padded)
• Length: Payload length in bytes (little-endian u32)
• Checksum: First 4 bytes of double SHA256 of payload
• Payload: Message-specific data

Constants

MAX_MESSAGE_PAYLOAD

Maximum message payload size (32 MB)

MESSAGE_HEADER_SIZE

Bitcoin P2P message header size (magic + command + length + checksum)

Functions

calculate_checksum

Calculate checksum for message payload (first 4 bytes of double SHA256)

deserialize_addr

deserialize_addrv2

Deserialize AddrV2Message from Bitcoin wire format (BIP155)

deserialize_block

deserialize_blocktxn

deserialize_cmpctblock

deserialize_feefilter

deserialize_getblocks

deserialize_getblocktxn

deserialize_getdata

Deserialize GetDataMessage from Bitcoin wire format

deserialize_getheaders

Deserialize GetHeadersMessage from Bitcoin wire format

deserialize_headers

Deserialize HeadersMessage from Bitcoin wire format

deserialize_inv

Deserialize InvMessage from Bitcoin wire format

deserialize_message

Deserialize Bitcoin P2P wire format to network message

deserialize_notfound

Deserialize NotFoundMessage from Bitcoin wire format.

deserialize_ping

Deserialize PingMessage from Bitcoin wire format

deserialize_pong

Deserialize PongMessage from Bitcoin wire format

deserialize_reject

deserialize_sendcmpct

deserialize_tx

deserialize_version

Deserialize VersionMessage from Bitcoin wire format

serialize_addr

Serialize AddrMessage to Bitcoin wire format (legacy addr) Format: CompactSize(count) + [timestamp(4) + services(8) + addr(16) + port(2)]*

serialize_addrv2

Serialize AddrV2Message to Bitcoin wire format (BIP155) Format: CompactSize(count) + [time(4) + services(8) + address_type(1) + address(var) + port(2)]*

serialize_block

serialize_blocktxn

BIP152: blocktxn - block_hash(32) + count(varint) + transactions

serialize_cmpctblock

BIP152: cmpctblock - header(80) + nonce(8) + shortids(varint+6*count) + prefilled(varint+each: diff_index+tx)

serialize_feefilter

Serialize FeeFilterMessage per BIP133: 8-byte feerate (LE)

serialize_getblocks

Serialize GetBlocksMessage - same structure as GetHeaders (version + locator + hash_stop)

serialize_getblocktxn

BIP152: getblocktxn - block_hash(32) + indexes(varint count + diff-encoded varints)

serialize_getdata

Serialize GetDataMessage to Bitcoin wire format Format: identical to Inv - count (varint) + count * (type u32 LE + hash 32 bytes)

serialize_getheaders

Serialize GetHeadersMessage to Bitcoin wire format Format: version (4 bytes LE) + hash_count (varint) + hashes (32 bytes each) + hash_stop (32 bytes)

serialize_headers

Serialize HeadersMessage to Bitcoin wire format Format: count (varint) + headers (each: 80 bytes header + varint tx_count which is always 0)

serialize_inv

Serialize InvMessage to Bitcoin wire format Format: count (varint) + count * (type u32 LE + hash 32 bytes)

serialize_message

Serialize a network message to Bitcoin P2P wire format

serialize_notfound

Serialize NotFoundMessage to Bitcoin wire format. Format: identical to Inv/GetData - count (varint) + count * (type u32 LE + hash 32 bytes)

serialize_ping

Serialize PingMessage to Bitcoin wire format (8-byte nonce)

serialize_pong

Serialize PongMessage to Bitcoin wire format (8-byte nonce)

serialize_reject

Serialize RejectMessage per BIP61: message(12) + ccode(1) + reason(var) + data(32 optional)

serialize_sendcmpct

BIP152: sendcmpct - 1 byte prefer_cmpct + 8 bytes version (LE)

serialize_tx

serialize_version

Serialize VersionMessage to Bitcoin wire format Format per Bitcoin protocol specification: