Bitcoin Dev Archive / 2016 BIP144: use of 1<<3 service bit 1 message, 29 Apr 2016. Started by Johnson Lau. Johnson Lau The peer-to-peer protocolSegregated witnessBIP 144 Permalink | Original thread on gnusha.org Johnson Lau 29 Apr 2016, 07:25 UTC permalink original Please note that the BIP144 has just been revised to match the implementation in #7910. We will use the 1<<3 service bit (NODE_WITNESS) to signal the readiness for segwit. https://github.com/bitcoin/bips/commit/dde47fc973b015c6cc91a0ed28fb3aca57add5e6 <https://github.com/bitcoin/bips/commit/dde47fc973b015c6cc91a0ed28fb3aca57add5e6>