Add Fast-Rise difficulty protection
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SHA256:739BZv8LvIDY2tR7lXLy/IQ6MaGTQtYcG9GNvCjmpVM
4 changed files with 245 additions and 1 deletions
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@ -351,4 +351,182 @@ BOOST_AUTO_TEST_CASE(ASERT_reference_vector_run06_test)
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BOOST_AUTO_TEST_CASE(FastRise_activation_and_trigger_test)
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{
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auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
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auto consensus = chainParams->GetConsensus();
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consensus.asertActivationHeight = 6500;
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consensus.fastRiseActivationHeight = 7000;
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std::vector<CBlockIndex> blocks(7001);
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arith_uint256 baseTarget = UintToArith256(consensus.powLimit);
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baseTarget >>= 8;
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const unsigned int baseBits = baseTarget.GetCompact();
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const int64_t startTime = 1800000000;
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// Build an otherwise perfectly spaced chain.
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for (int i = 0; i <= 7000; ++i) {
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blocks[i].pprev = i ? &blocks[i - 1] : nullptr;
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blocks[i].nHeight = i;
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blocks[i].nTime = startTime + i * consensus.nPowTargetSpacing;
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blocks[i].nBits = baseBits;
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}
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// Two fast intervals out of the last four must NOT trigger Fast-Rise.
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blocks[6995].nTime = startTime + 6995 * consensus.nPowTargetSpacing;
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blocks[6996].nTime = blocks[6995].nTime + 60;
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blocks[6997].nTime = blocks[6996].nTime + 60;
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blocks[6998].nTime = blocks[6997].nTime + 600;
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blocks[6999].nTime = blocks[6998].nTime + 600;
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auto baselineConsensus = consensus;
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baselineConsensus.fastRiseActivationHeight = 1000000;
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const unsigned int twoFastBaseline =
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GetNextWorkRequired(&blocks[6999], nullptr, baselineConsensus);
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const unsigned int twoFastResult =
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GetNextWorkRequired(&blocks[6999], nullptr, consensus);
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BOOST_CHECK_EQUAL(twoFastResult, twoFastBaseline);
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// Three fast intervals out of the last four MUST trigger Fast-Rise.
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blocks[6998].nTime = blocks[6997].nTime + 60;
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blocks[6999].nTime = blocks[6998].nTime + 600;
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const unsigned int threeFastBaseline =
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GetNextWorkRequired(&blocks[6999], nullptr, baselineConsensus);
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const unsigned int threeFastResult =
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GetNextWorkRequired(&blocks[6999], nullptr, consensus);
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arith_uint256 expectedFastTarget;
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expectedFastTarget.SetCompact(blocks[6999].nBits);
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expectedFastTarget >>= 1;
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BOOST_CHECK_NE(threeFastResult, threeFastBaseline);
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BOOST_CHECK_EQUAL(threeFastResult, expectedFastTarget.GetCompact());
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// The same pattern before activation must still behave exactly like ASERT.
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consensus.fastRiseActivationHeight = 7001;
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const unsigned int preActivationResult =
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GetNextWorkRequired(&blocks[6999], nullptr, consensus);
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BOOST_CHECK_EQUAL(preActivationResult, threeFastBaseline);
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}
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BOOST_AUTO_TEST_CASE(FastRise_returns_to_ASERT_test)
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{
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auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
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auto consensus = chainParams->GetConsensus();
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consensus.asertActivationHeight = 6500;
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consensus.fastRiseActivationHeight = 7000;
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std::vector<CBlockIndex> blocks(7002);
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arith_uint256 baseTarget = UintToArith256(consensus.powLimit);
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baseTarget >>= 8;
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const unsigned int baseBits = baseTarget.GetCompact();
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const int64_t startTime = 1800000000;
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for (int i = 0; i <= 7001; ++i) {
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blocks[i].pprev = i ? &blocks[i - 1] : nullptr;
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blocks[i].nHeight = i;
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blocks[i].nTime = startTime + i * consensus.nPowTargetSpacing;
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blocks[i].nBits = baseBits;
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}
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// Create a 3-of-4 fast pattern before block 7000.
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blocks[6995].nTime = startTime + 6995 * consensus.nPowTargetSpacing;
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blocks[6996].nTime = blocks[6995].nTime + 60;
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blocks[6997].nTime = blocks[6996].nTime + 60;
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blocks[6998].nTime = blocks[6997].nTime + 60;
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blocks[6999].nTime = blocks[6998].nTime + 600;
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const unsigned int triggeredBits =
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GetNextWorkRequired(&blocks[6999], nullptr, consensus);
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arith_uint256 triggeredTarget;
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triggeredTarget.SetCompact(triggeredBits);
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arith_uint256 expectedTriggeredTarget;
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expectedTriggeredTarget.SetCompact(blocks[6999].nBits);
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expectedTriggeredTarget >>= 1;
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BOOST_CHECK_EQUAL(triggeredTarget.GetCompact(), expectedTriggeredTarget.GetCompact());
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// Simulate block 7000 being mined at the Fast-Rise target.
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blocks[7000].nBits = triggeredBits;
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blocks[7000].nTime = blocks[6999].nTime + 600;
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// The last four intervals are now 60, 60, 600, 600:
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// only two are fast, so Fast-Rise must stop immediately.
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auto baselineConsensus = consensus;
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baselineConsensus.fastRiseActivationHeight = 1000000;
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const unsigned int expectedASERT =
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GetNextWorkRequired(&blocks[7000], nullptr, baselineConsensus);
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const unsigned int actual =
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GetNextWorkRequired(&blocks[7000], nullptr, consensus);
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BOOST_CHECK_EQUAL(actual, expectedASERT);
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}
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BOOST_AUTO_TEST_CASE(FastRise_zero_and_negative_intervals_test)
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{
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auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
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auto consensus = chainParams->GetConsensus();
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consensus.asertActivationHeight = 6500;
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consensus.fastRiseActivationHeight = 7000;
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std::vector<CBlockIndex> blocks(7001);
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arith_uint256 baseTarget = UintToArith256(consensus.powLimit);
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baseTarget >>= 8;
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const unsigned int baseBits = baseTarget.GetCompact();
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const int64_t startTime = 1800000000;
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for (int i = 0; i <= 7000; ++i) {
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blocks[i].pprev = i ? &blocks[i - 1] : nullptr;
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blocks[i].nHeight = i;
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blocks[i].nTime = startTime + i * consensus.nPowTargetSpacing;
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blocks[i].nBits = baseBits;
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}
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// Last four raw intervals:
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// 60, 0, -30, 600
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// Zero and negative intervals must count as fast.
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blocks[6995].nTime = startTime + 6995 * consensus.nPowTargetSpacing;
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blocks[6996].nTime = blocks[6995].nTime + 60;
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blocks[6997].nTime = blocks[6996].nTime;
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blocks[6998].nTime = blocks[6997].nTime - 30;
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blocks[6999].nTime = blocks[6998].nTime + 600;
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auto baselineConsensus = consensus;
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baselineConsensus.fastRiseActivationHeight = 1000000;
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const unsigned int baseline =
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GetNextWorkRequired(&blocks[6999], nullptr, baselineConsensus);
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const unsigned int actual =
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GetNextWorkRequired(&blocks[6999], nullptr, consensus);
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arith_uint256 expectedFastTarget;
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expectedFastTarget.SetCompact(blocks[6999].nBits);
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expectedFastTarget >>= 1;
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BOOST_CHECK_NE(actual, baseline);
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BOOST_CHECK_EQUAL(actual, expectedFastTarget.GetCompact());
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}
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BOOST_AUTO_TEST_SUITE_END()
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