Function ssb_validate::message::validate_ooo_message_hash_chain

pub fn validate_ooo_message_hash_chain<T: AsRef<[u8]>, U: AsRef<[u8]>>(
    message_bytes: T, 
    previous_msg_bytes: Option<U>
) -> Result<()>

Check that an out-of-order message is valid.

It expects the messages to be the JSON encoded message of shape: {key: "", value: {...}}

This checks that:

• the author has not changed
• the actual hash matches the hash claimed in key
• the message contains the correct fields

This does not check:

• the signature. See ssb-verify-signatures which lets you to batch verification of signatures.
• the sequence increments by 1 compared to previous
• the actual hash of the previous message matches the hash claimed in previous

previous_msg_bytes will be None only when message_bytes is the first message by that author.