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// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <boost/assign/list_of.hpp> // for 'map_list_of()'
#include <boost/foreach.hpp>
#include "checkpoints.h"
#include "main.h"
#include "uint256.h"
namespace Checkpoints
{
typedef std::map<int, uint256> MapCheckpoints;
// How many times we expect transactions after the last checkpoint to
// be slower. This number is a compromise, as it can't be accurate for
// every system. When reindexing from a fast disk with a slow CPU, it
// can be up to 20, while when downloading from a slow network with a
// fast multicore CPU, it won't be much higher than 1.
static const double fSigcheckVerificationFactor = 5.0;
struct CCheckpointData {
const MapCheckpoints *mapCheckpoints;
int64 nTimeLastCheckpoint;
int64 nTransactionsLastCheckpoint;
double fTransactionsPerDay;
};
// What makes a good checkpoint block?
// + Is surrounded by blocks with reasonable timestamps
// (no blocks before with a timestamp after, none after with
// timestamp before)
// + Contains no strange transactions
static MapCheckpoints mapCheckpoints =
boost::assign::map_list_of
( 11111, uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d"))
( 33333, uint256("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6"))
( 74000, uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20"))
(105000, uint256("0x00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97"))
(134444, uint256("0x00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe"))
(168000, uint256("0x000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763"))
(193000, uint256("0x000000000000059f452a5f7340de6682a977387c17010ff6e6c3bd83ca8b1317"))
(210000, uint256("0x000000000000048b95347e83192f69cf0366076336c639f9b7228e9ba171342e"))
(216116, uint256("0x00000000000001b4f4b433e81ee46494af945cf96014816a4e2370f11b23df4e"))
(225430, uint256("0x00000000000001c108384350f74090433e7fcf79a606b8e797f065b130575932"))
;
static const CCheckpointData data = {
&mapCheckpoints,
1363044259, // * UNIX timestamp of last checkpoint block
14264869, // * total number of transactions between genesis and last checkpoint
// (the tx=... number in the SetBestChain debug.log lines)
60000.0 // * estimated number of transactions per day after checkpoint
};
static MapCheckpoints mapCheckpointsTestnet =
boost::assign::map_list_of
( 546, uint256("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70"))
;
static const CCheckpointData dataTestnet = {
&mapCheckpointsTestnet,
1338180505,
16341,
300
};
const CCheckpointData &Checkpoints() {
if (fTestNet)
return dataTestnet;
else
return data;
}
bool CheckBlock(int nHeight, const uint256& hash)
{
if (!GetBoolArg("-checkpoints", true))
return true;
const MapCheckpoints& checkpoints = *Checkpoints().mapCheckpoints;
MapCheckpoints::const_iterator i = checkpoints.find(nHeight);
if (i == checkpoints.end()) return true;
return hash == i->second;
}
// Guess how far we are in the verification process at the given block index
double GuessVerificationProgress(CBlockIndex *pindex) {
if (pindex==NULL)
return 0.0;
int64 nNow = time(NULL);
double fWorkBefore = 0.0; // Amount of work done before pindex
double fWorkAfter = 0.0; // Amount of work left after pindex (estimated)
// Work is defined as: 1.0 per transaction before the last checkoint, and
// fSigcheckVerificationFactor per transaction after.
const CCheckpointData &data = Checkpoints();
if (pindex->nChainTx <= data.nTransactionsLastCheckpoint) {
double nCheapBefore = pindex->nChainTx;
double nCheapAfter = data.nTransactionsLastCheckpoint - pindex->nChainTx;
double nExpensiveAfter = (nNow - data.nTimeLastCheckpoint)/86400.0*data.fTransactionsPerDay;
fWorkBefore = nCheapBefore;
fWorkAfter = nCheapAfter + nExpensiveAfter*fSigcheckVerificationFactor;
} else {
double nCheapBefore = data.nTransactionsLastCheckpoint;
double nExpensiveBefore = pindex->nChainTx - data.nTransactionsLastCheckpoint;
double nExpensiveAfter = (nNow - pindex->nTime)/86400.0*data.fTransactionsPerDay;
fWorkBefore = nCheapBefore + nExpensiveBefore*fSigcheckVerificationFactor;
fWorkAfter = nExpensiveAfter*fSigcheckVerificationFactor;
}
return fWorkBefore / (fWorkBefore + fWorkAfter);
}
int GetTotalBlocksEstimate()
{
if (!GetBoolArg("-checkpoints", true))
return 0;
const MapCheckpoints& checkpoints = *Checkpoints().mapCheckpoints;
return checkpoints.rbegin()->first;
}
CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
{
if (!GetBoolArg("-checkpoints", true))
return NULL;
const MapCheckpoints& checkpoints = *Checkpoints().mapCheckpoints;
BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, checkpoints)
{
const uint256& hash = i.second;
std::map<uint256, CBlockIndex*>::const_iterator t = mapBlockIndex.find(hash);
if (t != mapBlockIndex.end())
return t->second;
}
return NULL;
}
}
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