Update deployment for BIP65 #227

pull btcdrak wants to merge 1 commits into bitcoin:master from btcdrak:bip65deploy changing 1 files +9 −3

btcdrak commented at 12:13 PM on October 23, 2015: contributor

BIP65 is being deployed by IsSuperMajority. Updating this BIP to reflect this fact.
Update deployment for BIP65 3ab04a6562
petertodd commented at 4:27 PM on October 23, 2015: contributor

ACK

Thanks for doing this for me!
in bip-0065.mediawiki:None in 3ab04a6562
```
 280 | +66, with the same thresholds, but for nVersion = 4. The new rules are
 281 | +in effect for every block (at height H) with nVersion = 4 and at least
 282 | +750 out of 1000 blocks preceding it (with heights H-1000..H-1) also
 283 | +have nVersion = 4. Furthermore, when 950 out of the 1000 blocks
 284 | +preceding a block do have nVersion = 4, nVersion = 3 blocks become
 285 | +invalid, and all further blocks enforce the new rules.
```
luke-jr commented at 4:31 PM on October 23, 2015:

What? I thought the plan was to have nVersion=3 blocks remain valid after this softfork? Otherwise we lose another bit forever...
petertodd commented at 4:42 PM on October 23, 2015:

We don't lose another bit.

The existing IsSuperMajority() mechanism can't do that safely, as it'd mean the soft-fork could be reversed after the fact. The nVersion bits mechanism needs to record state to do this safely.
luke-jr commented at 4:47 PM on October 23, 2015:

For others who might read this...

I was elaborately updated on the rationale on IRC: Essentially the plan is for versionbits to unburn all the lower bits at once by burning a higher one. While it might be nice not to even temporarily burn this one here, the code/testing overhead isn't worth it.
luke-jr referenced this in commit 914702e39c on Oct 23, 2015
luke-jr merged this on Oct 23, 2015
luke-jr closed this on Oct 23, 2015
btcdrak deleted the branch on Oct 23, 2015
luke-jr referenced this in commit 876b93151f on Jan 20, 2018
luke-jr referenced this in commit 700b5e7a5d on Jan 20, 2018
gmaxwell cross-referenced this on Apr 18, 2021 from issue BIP341: speedy trial activation parameters by ajtowns

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#1104 BIP341: speedy trial activation parameters