Design Scroll wire protocol

[frisitano]

Overview

We need to define a P2P gossip protocol that allows the rollup-node to follow the unsafe scroll rollup chain tip. This should cover both gossip topics and request-response support. Insights from the Optimism p2p protocol can be found here.

[frisitano]

The following is an initial proposal for the scroll wire protocol. We will keep it simple and minimalist in the first instance and can extend as we require additional functionality.

Topic Naming

Topics will be named using the following standard

scroll/chain_id/topic_version/name

Gossip Topic

We will have a single topic which is used to gossip blocks:
scroll/chain_id/<topic_version>/blocks

In scroll we use V1 blocks and they will be encoded as:

Block {
signature: secp256k1 sequencer signature,
payload: SSZ-encoded execution payload
}

[Thegaram]

Initial test implementation was added in 6c8c70c.