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Reduce checkpoints' effect on consensus.

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Instead of only checking height to decide whether to disable script checks,
actually check whether a block is an ancestor of a checkpoint, up to which
headers have been validated. This means that we don't have to prevent
accepting a side branch anymore - it will be safe, just less fast to
do.

We still need to prevent being fed a multitude of low-difficulty headers
filling up our memory. The mechanism for that is unchanged for now: once
a checkpoint is reached with headers, no headers chain branching off before
that point are allowed anymore.
This commit is contained in:
Pieter Wuille
2015-03-19 05:34:06 -07:00
parent 23254131a3
commit dce8360e44
6 changed files with 15 additions and 38 deletions
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2
src/init.cpp
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@@ -347,7 +347,7 @@ std::string HelpMessage(HelpMessageMode mode)
strUsage += HelpMessageGroup(_("Debugging/Testing options:"));
if (GetBoolArg("-help-debug", false))
{
strUsage += HelpMessageOpt("-checkpoints", strprintf(_("Only accept block chain matching built-in checkpoints (default: %u)"), 1));
strUsage += HelpMessageOpt("-checkpoints", strprintf(_("Disable expensive verification for known chain history (default: %u)"), 1));
strUsage += HelpMessageOpt("-dblogsize=<n>", strprintf(_("Flush database activity from memory pool to disk log every <n> megabytes (default: %u)"), 100));
strUsage += HelpMessageOpt("-disablesafemode", strprintf(_("Disable safemode, override a real safe mode event (default: %u)"), 0));
strUsage += HelpMessageOpt("-testsafemode", strprintf(_("Force safe mode (default: %u)"), 0));