BlindTransaction() and VerifyAmounts() need detailed error return codes

[philippem]

The functions BlindTransaction() and VerifyAmounts() each have several failure paths, but only use -1 and false to indicate to the caller that an operation failed. This makes it difficult to report helpful error messages to the user.

The error paths could return an enum indicating the reason for failure, and the callers could then surface error strings to the user.

BlindTransaction(): https://github.com/ElementsProject/elements/blob/master/src/blind.cpp#L286
VerifyAmounts(): https://github.com/ElementsProject/elements/blob/master/src/confidential_validation.cpp#L134

[brandon-bb]

Is there any work currently being done on this? if not, please assign.

[delta1]

Hey @CrypticBantu - sorry for the confusion! Will hack on this as soon as possible, apologies for the inconvenience.