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Define Erb filetype for historical blobs and data columns #13

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10 changes: 10 additions & 0 deletions types/0x0101.md
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# CompressedBlobSidecar

```
type: [0x01, 0x01]
data: ssz(List[snappyFramed(BlobSidecar), MAX_BLOBS_PER_BLOCK | MAX_BLOBS_PER_BLOCK_ELECTRA])
```

`CompressedBlobSidecar`s contains `BlobSidecar` objects encoded using SSZ then compressed using the snappy [framing format](https://github.com/google/snappy/blob/master/framing_format.txt). The SSZ datatype of `data` is `List[List[byte, 262144], MAX_BLOBS_PER_BLOCK | MAX_BLOBS_PER_BLOCK_ELECTRA]`. The maximum length of the inner `List` is `2**18`, which accommodates a maximally sized `BlobSidecar` with some overhead in case of inefficient snappy encoding. The maximum length of the outer list is fork-dependent, and should be determined dynamically based on the `slot` of the first `BlobSidecar`.

The encoding of each list element matches the `response_chunk` encoding for `BlobSidecarsByRoot` and `BlobSidecarsByRange` requests from the p2p specification.
2 changes: 2 additions & 0 deletions types/README.md
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Expand Up @@ -5,6 +5,8 @@ This is a sorted list by type number
|---|---|---|---|
| [0x0000](0x0000.md) | Empty | None | |
| [0x0100](0x0100.md) | CompressedSignedBeaconBlock | [Era](../formats/era.md) | |
| [0x0101](0x0101.md) | CompressedBlobSidecar | TODO: Erb | |
| [0x0102](0x0102.md) | CompressedDataColumnSidecar | TODO: Erb | |
| [0x0200](0x0200.md) | CompressedBeaconState | [Era](../formats/era.md) | |
| [0x0300](0x0300.md) | CompressedHeader | [Era1](../formats/era1.md), [E2SS](../formats/e2ss.md) | |
| [0x0301](0x0301.md) | CompressedHeaderWithProof | [E2HS](../formats/e2hs.md) | |
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