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clarify hex-encoded bytes string representation for fork digest in gossip topic 

Co-Authored-By: Diederik Loerakker <proto@protolambda.com>
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Danny Ryan 2020-03-10 15:04:44 -06:00 committed by GitHub
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specs/phase0/p2p-interface.md
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@ -221,7 +221,7 @@ The following gossipsub [parameters](https://github.com/libp2p/specs/tree/master
Topics are plain UTF-8 strings and are encoded on the wire as determined by protobuf (gossipsub messages are enveloped in protobuf messages). Topic strings have form: `/eth2/ForkDigest/Name/Encoding`. This defines both the type of data being sent on the topic and how the data field of the message is encoded. Topics are plain UTF-8 strings and are encoded on the wire as determined by protobuf (gossipsub messages are enveloped in protobuf messages). Topic strings have form: `/eth2/ForkDigest/Name/Encoding`. This defines both the type of data being sent on the topic and how the data field of the message is encoded.
- `ForkDigest` - the hex-encoded bytes of `ForkDigest(compute_fork_data_root(current_fork_version, genesis_validators_root)[:4])` where - `ForkDigest` - the lowercase hex-encoded (no "0x" prefix) bytes of `ForkDigest(compute_fork_data_root(current_fork_version, genesis_validators_root)[:4])` where
- `current_fork_version` is the fork version of the epoch of the message to be sent on the topic - `current_fork_version` is the fork version of the epoch of the message to be sent on the topic
- `genesis_validators_root` is the static `Root` found in `state.genesis_validators_root` - `genesis_validators_root` is the static `Root` found in `state.genesis_validators_root`
- `Name` - see table below - `Name` - see table below