why not SIGHASH_BUNDLESTART/SIGHASH_INBUNDLE?
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2018-April/015862.html
why not SIGHASH_BUNDLESTART/SIGHASH_INBUNDLE?
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2018-April/015862.html