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Remove BIP68's dependence on this BIP. Remove deployment details.

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Alex Morcos 2016-02-29 15:59:43 -05:00
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@ -34,8 +34,9 @@ value to monotonically advance, thereby removing the capability for
miners to claim more transaction fees by lying about the timestamps of miners to claim more transaction fees by lying about the timestamps of
their block. their block.
This proposal seeks to ensure reliable behaviour in locktime calculations as This proposal seeks to ensure reliable behaviour in locktime calculations
required by BIP65 (CHECKLOCKTIMEVERIFY), BIP68 (sequence numbers), and BIP112 (CHECKSEQUENCEVERIFY). as required by BIP65 (CHECKLOCKTIMEVERIFY) and matching the behavior of
BIP68 (sequence numbers) and BIP112 (CHECKSEQUENCEVERIFY).
==Specification== ==Specification==
@ -58,11 +59,10 @@ block time for the purpose of checking lock-time constraints:
return pbegin[(pend - pbegin)/2]; return pbegin[(pend - pbegin)/2];
} }
Lock-time constraints are checked by the consensus method IsFinalTx(), Lock-time constraints are checked by the consensus method IsFinalTx().
or LockTime() under BIP68. These methods take the block time as one This method takes the block time as one parameter. This BIP proposes
parameter. This BIP proposes that after activation calls to that after activation calls to IsFinalTx() within consensus code use
IsFinalTx() or LockTime() within consensus code use the return value the return value of `GetMedianTimePast(pindexPrev)` instead.
of `GetMedianTimePast(pindexPrev)` instead.
A reference implementation of this proposal is provided by the A reference implementation of this proposal is provided by the
following pull request: following pull request:
@ -72,33 +72,10 @@ https://github.com/bitcoin/bitcoin/pull/6566
==Deployment== ==Deployment==
We reuse the double-threshold switchover mechanism from BIPs 34 and This BIP is to be deployed by either version-bits BIP9 or by isSuperMajority().
66, with the same thresholds, but for nVersion = 8. The new rules are Exact details TBD.
in effect for every block (at height H) with nVersion = 8 and at least
750 out of 1000 blocks preceding it (with heights H-1000..H-1) also
have nVersion = 8. Furthermore, when 950 out of the 1000 blocks
preceding a block do have nVersion = 8, nVersion = 3 blocks become
invalid, and all further blocks enforce the new rules.
When assessing the block version as mask of ~0x20000007 must be applied It is recommended to deploy BIP68 and BIP112 at the same time as this BIP.
to work around the complications caused by
[http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-August/010396.html BIP101's premature use]
of the [https://gist.github.com/sipa/bf69659f43e763540550 undecided version bits proposal].
By applying ~0x20000007 with nVersion = 8, the thresholds should be tested
comparing block nVersion >= 4 as this will save a bit for future use.
It is recommended that this soft-fork deployment trigger include other related
proposals for improving Bitcoin's lock-time capabilities, including:
[https://github.com/bitcoin/bips/blob/master/bip-0065.mediawiki BIP 65]:
CHECKLOCKTIMEVERIFY,
[https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki BIP 68]:
Consensus-enforced transaction replacement signalled via sequence numbers,
and [https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki BIP 112]:
CHECKSEQUENCEVERIFY.
==Acknowledgements== ==Acknowledgements==