realizing you dont even need to bother doing varint if you expect a sha256 cidv1, it's always going to be 36 bytes
https://porcini.us-east.host.bsky.network/xrpc/com.atproto.sync.getBlob?did=did:plc:ia76kvnndjutgedggx2ibrem&cid=bafkreicjabriiwzsxuexwuiov7eezc77biwffsjj6i7gwlfkf5ssqg7p3e