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+<pre>
+  BIP: 149
+  Layer: Consensus (soft fork)
+  Title: Segregated Witness (second deployment)
+  Author: Shaolin Fry <shaolinfry@protonmail.ch>
+  Comments-Summary: No comments yet.
+  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0149
+  Status: Withdrawn
+  Type: Standards Track
+  Created: 2017-04-14
+  License: BSD-3-Clause
+           CC0-1.0
+</pre>
+
+==Abstract==
+
+This document specifies a user activated soft fork for [[bip-0141.mediawiki|BIP141]], [[bip-0143.mediawiki|BIP143]] and [[bip-0147.mediawiki|BIP147]] using versionbits with guaranteed lock-in.
+
+==Motivation==
+
+Miners have been reluctant to signal the BIP9 segwit deployment despite a large portion of the Bitcoin ecosystem who want the soft fork activated. This BIP specifies a user activated soft fork (UASF) that deploys segwit again using versionbits with guaranteed lock-in on timeout if the BIP is not already locked-in or activated by the timeout. This ensures users have sufficient time to prepare and no longer require a miner supermajority, while still allowing for an earlier miner activated soft fork (MASF).
+
+==Reference implementation==
+
+The reference implementation will refuse to run on Bitcoin mainnet before 7 November 2017, and can only be run on testnet and regtest until then.
+
+https://github.com/bitcoin/bitcoin/compare/master...shaolinfry:uasegwit-flagday
+
+==Specification==
+
+This deployment will set service bit (1<<5) as NODE_UAWITNESS.
+
+==Deployment==
+
+This BIP should only be deployed if BIP9-segwit fails to lock-in or activate before timeout on 15 November 2017. This BIP cannot be deployed before 15 November 2017.
+
+This BIP will be deployed by BIP8 with the name "segwit" and using bit 1.
+
+For Bitcoin mainnet, the BIP8 starttime will be midnight 16 November 2017 UTC (Epoch timestamp 1510790400) and BIP8 timeout will be 4 July 2018 UTC (Epoch timestamp 1530662400).
+
+For Bitcoin testnet, segwit is already activated so no deployment is specified.
+
+==Backwards Compatibility==
+
+This deployment reuses the GBT deployment name "segwit" to maintain compatibility with existing mining software.
+
+This deployment is incompatible with the BIP9-segwit deployment and should not be run concurrently with it.
+
+==Rationale==
+
+The '''starttime''' of this BIP is after the BIP9-segwit timeout to remove compatibility issues with old nodes.
+
+==References==
+
+[https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2017-April/014234.html Mailing list discussion]
+
+[[bip-0008.mediawiki|BIP8]]
+
+[[bip-0009.mediawiki|BIP9]]
+
+[[bip-0141.mediawiki|BIP141]]
+
+[[bip-0143.mediawiki|BIP143]]
+
+[[bip-0147.mediawiki|BIP147]]
+
+==Copyright==
+
+This document is dual licensed as BSD 3-clause, and Creative Commons CC0 1.0 Universal.