hashrpc

Hashrpc is a very simple stream protocol for hash based messages.

There are only three message types.

• get block
• send block
• control

All messages, including control messages, are hash addressed.

All hash addresses are CIDs.

Protocol

Single byte Uint8 for each message type:

• get block 1
• send block 2
• control 3

This specification does not define what a control message is or how it is used, that's up to the application. Nor does this specification define any size limitation on blocks, a "block" could be an entire CAR file reqested by its CID (once we have a spec for CAR CIDs).

All message types are bi-directional, any node can send any message type at any time.

get block

[ 1, length, CID ]

send block

[ 2, CIDLength, blockLength, CID, block ]

control

[ 3, CIDLength, blockLength, CID, block ]