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Update with BIP assignments
Update deployment methodology
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<pre>
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<pre>
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BIP: XX
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BIP: 113
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Title: Median time-past as endpoint for lock-time calculations
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Title: Median time-past as endpoint for lock-time calculations
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Author: Thomas Kerin <me@thomaskerin.io>
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Author: Thomas Kerin <me@thomaskerin.io>
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Mark Friedenbach <mark@friedenbach.org>
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Mark Friedenbach <mark@friedenbach.org>
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@ -35,7 +35,7 @@ miners to claim more transaction fees by lying about the timestamps of
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their block.
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their block.
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This proposal seeks to ensure reliable behaviour in locktime calculations as
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This proposal seeks to ensure reliable behaviour in locktime calculations as
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required by BIP65, BIP68, and BIPXX (OP_CHECKSEQUENCEVERIFY).
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required by BIP65 (CHECKLOCKTIMEVERIFY), BIP68, and BIP112 (CHECKSEQUENCEVERIFY).
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==Specification==
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==Specification==
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@ -72,16 +72,33 @@ https://github.com/maaku/bitcoin/tree/medianpasttimelock
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==Deployment==
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==Deployment==
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We reuse the double-threshold switchover mechanism from BIPs 34 and 66, with the
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We reuse the double-threshold switchover mechanism from BIPs 34 and
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same thresholds, but for block.nVersion = 4. The new rules are in effect for
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66, with the same thresholds, but for nVersion = 8. The new rules are
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every block (at height H) with nVersion = 4 and at least 750 out of 1000 blocks
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in effect for every block (at height H) with nVersion = 8 and at least
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preceding it (with heights H-1000...H-1) also have nVersion = 4. Furthermore,
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750 out of 1000 blocks preceding it (with heights H-1000..H-1) also
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when 950 out of the 1000 blocks preceding a block do have nVersion = 4,
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have nVersion = 8. Furthermore, when 950 out of the 1000 blocks
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nVersion = 3 blocks become invalid, and all further blocks enforce the new rules.
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preceding a block do have nVersion = 8, nVersion = 3 blocks become
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invalid, and all further blocks enforce the new rules.
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When assessing the block version as mask of ~0x20000007 must be applied
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to work around the complications caused by
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[http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-August/010396.html BIP101's premature use]
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of the [https://gist.github.com/sipa/bf69659f43e763540550 undecided version bits proposal].
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By applying ~0x20000007 with nVersion = 8, the thresholds should be tested
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comparing block nVersion >= 4 as this will save a bit for future use.
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It is recommended that this soft-fork deployment trigger include other related
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It is recommended that this soft-fork deployment trigger include other related
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proposals for improving Bitcoin's lock-time capabilities, such as BIP 65, BIP68
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proposals for improving Bitcoin's lock-time capabilities, including:
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and CHECKSEQUENCEVERIFY.
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[https://github.com/bitcoin/bips/blob/master/bip-0065.mediawiki BIP 65]:
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CHECKLOCKTIMEVERIFY,
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[https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki BIP 68]:
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Consensus-enforced transaction replacement signalled via sequence numbers,
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and [https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki BIP 112]:
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CHECKSEQUENCEVERIFY.
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==Acknowledgements==
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==Acknowledgements==
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@ -89,6 +106,9 @@ and CHECKSEQUENCEVERIFY.
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Mark Friedenbach for designing and authoring the reference
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Mark Friedenbach for designing and authoring the reference
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implementation of this BIP.
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implementation of this BIP.
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Thanks go to Gregory Maxwell who came up with the original idea,
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in #bitcoin-wizards on 2013-07-16.
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Thomas Kerin authored this BIP document.
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Thomas Kerin authored this BIP document.
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@ -105,7 +125,11 @@ concerns with existing protocols.
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[https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki BIP68: Consensus-enforced transaction replacement signaled via sequence numbers]
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[https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki BIP68: Consensus-enforced transaction replacement signaled via sequence numbers]
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[https://github.com/bitcoin/bips/blob/master/bip-00.mediawiki BIPXX: CHECKSEQUENCEVERIFY]
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[https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki BIP112: CHECKSEQUENCEVERIFY]
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[http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-August/010396.html Softfork deployment considerations]
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[https://gist.github.com/sipa/bf69659f43e763540550 Version bits]
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==Copyright==
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==Copyright==
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