# 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 ]
```


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

hashrpc

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

mikeal

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hashrpc

hashrpc

Protocol

get block

send block

control

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