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authorGregory Maxwell <greg@xiph.org>2016-10-22 05:33:25 +0000
committerGregory Maxwell <greg@xiph.org>2016-11-02 01:47:02 +0000
commitfd46136dfaf68a7046cf7b8693824d73ac6b1caf (patch)
tree033a84a28fd516325144cb0cd9b31545f81fddf8 /src/chainparams.cpp
parent3d69ecb4edeb80003a1a41442e320898a30dbd9c (diff)
IBD check uses minimumchain work instead of checkpoints.
This introduces a 'minimum chain work' chainparam which is intended to be the known amount of work in the chain for the network at the time of software release. If you don't have this much work, you're not yet caught up. This is used instead of the count of blocks test from checkpoints. This criteria is trivial to keep updated as there is no element of subjectivity, trust, or position dependence to it. It is also a more reliable metric of sync status than a block count.
Diffstat (limited to 'src/chainparams.cpp')
-rw-r--r--src/chainparams.cpp10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 5850016ae2..a57ab632e4 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -96,6 +96,9 @@ public:
consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1479168000; // November 15th, 2016.
consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1510704000; // November 15th, 2017.
+ // The best chain should have at least this much work.
+ consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000002cb971dd56d1c583c20f90");
+
/**
* The message start string is designed to be unlikely to occur in normal data.
* The characters are rarely used upper ASCII, not valid as UTF-8, and produce
@@ -191,6 +194,9 @@ public:
consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1462060800; // May 1st 2016
consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1493596800; // May 1st 2017
+ // The best chain should have at least this much work.
+ consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000198b4def2baa9338d6");
+
pchMessageStart[0] = 0x0b;
pchMessageStart[1] = 0x11;
pchMessageStart[2] = 0x09;
@@ -224,6 +230,7 @@ public:
fRequireStandard = false;
fMineBlocksOnDemand = false;
+
checkpointData = (CCheckpointData) {
boost::assign::map_list_of
( 546, uint256S("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70")),
@@ -265,6 +272,9 @@ public:
consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 0;
consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 999999999999ULL;
+ // The best chain should have at least this much work.
+ consensus.nMinimumChainWork = uint256S("0x00");
+
pchMessageStart[0] = 0xfa;
pchMessageStart[1] = 0xbf;
pchMessageStart[2] = 0xb5;