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Merge pull request #229 from petertodd/bip65-spv-clients

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BIP65 spv clients
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Luke-Jr 2015-10-27 20:53:26 +00:00
commit e770b1cd33
1 changed files with 12 additions and 2 deletions
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@ -277,8 +277,8 @@ We reuse the double-threshold IsSuperMajority() switchover mechanism used in
BIP 66 with the same thresholds, but for nVersion = 4. The new rules are BIP 66 with the same thresholds, but for nVersion = 4. The new rules are
in effect for every block (at height H) with nVersion = 4 and at least in effect for every block (at height H) with nVersion = 4 and at least
750 out of 1000 blocks preceding it (with heights H-1000..H-1) also 750 out of 1000 blocks preceding it (with heights H-1000..H-1) also
have nVersion = 4. Furthermore, when 950 out of the 1000 blocks have nVersion >= 4. Furthermore, when 950 out of the 1000 blocks
preceding a block do have nVersion = 4, nVersion = 3 blocks become preceding a block do have nVersion >= 4, nVersion < 4 blocks become
invalid, and all further blocks enforce the new rules. invalid, and all further blocks enforce the new rules.
It should be noted that BIP9 involves permanently setting a high-order bit to It should be noted that BIP9 involves permanently setting a high-order bit to
@ -286,6 +286,16 @@ It should be noted that BIP9 involves permanently setting a high-order bit to
no bits in nVersion are permanently lost. no bits in nVersion are permanently lost.
===SPV Clients===
While SPV clients are (currently) unable to validate blocks in general,
trusting miners to do validation for them, they are able to validate block
headers and thus can validate a subset of the deployment rules. SPV clients
should reject nVersion < 4 blocks if 950 out of 1000 preceding blocks have
nVersion >= 4 to prevent false confirmations from the remaining 5% of
non-upgraded miners when the 95% threshold has been reached.
==Credits== ==Credits==
Thanks goes to Gregory Maxwell for suggesting that the argument be compared Thanks goes to Gregory Maxwell for suggesting that the argument be compared