Function read_record 

pub fn read_record(
    proof: &[u8],
    did: &str,
    key: &CommitKey,
    collection: &str,
    rkey: &str,
) -> Result<Option<Value>, ProofError>

The record at collection/rkey in did’s repository, as proof shows it, in its JSON form. None when the proof shows the repository holds nothing there.

key must come from did’s own DID document; see SignedCommit::verify. The record’s $type must be collection.