BIP-32 derivations and master fingerprint; ECDSA and Schnorr signatures on Secp256k1 #49
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…al support for points and arithmetics in the app-sdk
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This adds support for ECALLs, and SDK abstractions, for BIP32 derivations, ECDSA signatures and Schnorr signatures on the Secp256k1 curve.
The ECALL interface is a bit too BOLOS-specific, but the exposed sdk abstractions are cleaner; therefore, future refactorings without too many breaking changes should be feasible.