Add SWIP: Fork Digest and BzzAddress Encoding #84
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Introduce a fork digest mechanism that enables nodes to identify compatible peers during network upgrades via the handshake and Hive peer gossip. Key features: - 4-byte fork digest derived from genesis hash and fork version - Handshake integration for connection-time compatibility checks - Hive protocol integration for fork-aware peer gossip filtering - Updated BzzAddress signature scheme (v1) removing redundant prefix - Two-release migration path for backwards compatibility
Extend the fork digest SWIP to also clean up underlay encoding: - Change `bytes underlay` to `repeated bytes underlays` in protobuf - Remove custom 0x99 prefix and varint length encoding - Signature v1 uses simple concatenation of multiaddr bytes - Add rationale for why no additional framing is needed - Add test cases for signature verification and underlay encoding This separates wire encoding (protobuf) from signature construction (application logic) and simplifies implementations.
mfw78
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Summary
This SWIP introduces a fork digest mechanism for network upgrade coordination and cleans up the BzzAddress underlay encoding by replacing custom serialization with idiomatic protobuf.
Key Features
Fork Digest
BzzAddress Encoding
repeated bytes underlaysreplacesbytes underlaywith custom encoding0x99magic prefix or varint length encodingSignature Scheme (v1)
"bee-handshake-"prefix (EIP-191 already provides domain separation)Migration Path
Feedback Requested
The exact composition of the genesis hash requires further discussion. Candidates for inclusion:
network_id(required)genesis_timestamp