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P2P Protocol
Alexander Chepurnoy edited this page Jan 21, 2021
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First of all, nodes are doing handshaking by sending each other handshake messages. Handshaking details are provided in dedicated P2P Handshaking doc
Every message in P2P protocol has the following format:
| Length | Field Name | Details |
|---|---|---|
| 4 | Magic bytes | Network-specific magic bytes, see Note 1. |
| 1 | Message code | One byte describing message type |
| 4 | Message body length | Length of handshake body (specified below), as signed 32-bit integer |
| 4 | Handshake body checksum | First four bytes of blake2b(message body) |
| * | Message body | Message body (specified below) |
Notes:
- For the testnet, magic bytes are [2, 0, 0, 1] (in decimal). For mainnet, [1, 0, 2, 4] (in decimal).
- No VLQ and ZigZag encoding is used for message length (for historical reasons), bytes are coming in big-endian order. [TODO: provide descriptions for possible values of message body]