ICRC-103: a standard for listing outstanding allowances in ledgers

[bogwar]

The icrc2_allowance method can be used to get the allowance between specific pairs of accounts on the ledger. However, retrieving all allowances associated with a principal is challenging because it requires knowledge of the various subaccounts and spender information linked to that principal. Additionally, while calls to the icrc2_approve and icrc2_transfer_from methods are recorded in the ledger, determining which allowances are currently in effect would require traversing the entire ledger. This standard addresses these challenges by introducing an endpoint that allows querying all outstanding allowances related to a specific account, thus facilitating comprehensive and efficient allowance management.

ICRC-103 specifies a way to list outstanding allowances.