derive receipt of payment from note and sign by enclave #130
Description
Unlike on L1, there is no tx hash we can keep for accounting and later confirm payment
If sending money, there should be a receipt, signed by the enclave signer which can be verified as the remote attested validateer at a specific time on L1.
It may be beneficial to use a ZK-friendly signature in order to derive a proof-of-innocence client-side