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Update specs/altair/p2p-interface.md 

Co-authored-by: Diederik Loerakker <proto@protolambda.com>
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Alex Stokes 2021-06-08 12:06:02 -07:00 committed by GitHub
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@ -74,7 +74,7 @@ New topics are added in Altair to support the sync committees and the beacon blo
The specification around the creation, validation, and dissemination of messages has not changed from the Phase 0 document.
The derivation of the `message-id` has changed starting with Altair to incorporate the message topic along with the message data.
The derivation of the `message-id` has changed starting with Altair to incorporate the message `topic` along with the message `data`. These are fields of the `Message` Protobuf, and interpreted as empty byte strings if missing.
The `message-id` MUST be the following 20 byte value computed from the message:
* If `message.data` has a valid snappy decompression, set `message-id` to the first 20 bytes of the `SHA256` hash of
the concatenation of `MESSAGE_DOMAIN_VALID_SNAPPY` with the snappy decompressed message data and the topic name,