This is a simple, proof-of-concept canister that returns the input addresses of a given Bitcoin transaction, making use of HTTPS outcalls.
It exposes the following endpoint:
type tx_id = text;
type bitcoin_address = text;
"get_inputs": (tx_id) -> (vec bitcoin_address);Caution
This is merely a proof of concept. The code is not ready for use in production. In particular, the canister depends on the availability of the Btcscan.org HTTP API, i.e., there is a single point of failure. Moreover, the error handling is insufficient for use in production systems.