Change Details

As per title. Depends on D1189

This implements support for different fork id values as per https://github.com/bitcoincashorg/spec/blob/master/replay-protected-sighash.md . Depends on D1189

As per titleThis implements support for different fork id values as per https://github.com/bitcoincashorg/spec/blob/master/replay-protected-sighash.md . Depends on D1189