Upgrade to btcec v2
This major version doesn't reflect any new features or changes. It exists because a dependency, github.com/btcsuite/btcd
introduced a breaking change, splitting github.com/btcsuite/btcd/btcec
out into a separate go module.
If you are using github.com/btcsuite/btcd
0.22 or lower in your codebase, you should use tezosprotocol/v2.
If you are using github.com/btcsuite/btcd
0.23 or higher in your codebase, you should use tezosprotocol/v3.
If you are not using github.com/btcsuite/btcd at all, just go with v3.