Activate ASERT difficulty adjustment at block 6500
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a69a236209
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a16bb53457
SSH key fingerprint:
SHA256:739BZv8LvIDY2tR7lXLy/IQ6MaGTQtYcG9GNvCjmpVM
4 changed files with 290 additions and 1 deletions
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@ -141,4 +141,214 @@ BOOST_AUTO_TEST_CASE(ChainParams_SIGNET_sanity)
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sanity_check_chainparams(*m_node.args, CBaseChainParams::SIGNET);
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}
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BOOST_AUTO_TEST_CASE(ASERT_behavior_test)
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{
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const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN);
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const auto consensus = chainParams->GetConsensus();
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std::vector<CBlockIndex> blocks(6501);
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arith_uint256 anchorTargetValue = UintToArith256(consensus.powLimit);
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anchorTargetValue >>= 8;
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const unsigned int anchorBits = anchorTargetValue.GetCompact();
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const int64_t startTime = 1800000000;
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for (int i = 0; i <= 6500; ++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 = anchorBits;
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}
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// Block 6499 is still governed by the legacy DAA.
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const unsigned int preActivationBits =
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GetNextWorkRequired(&blocks[6498], nullptr, consensus);
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BOOST_CHECK_EQUAL(preActivationBits, anchorBits);
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// Block 6500 is the first ASERT block. Ideal 10-minute spacing
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// must preserve the anchor target.
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const unsigned int idealBits =
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GetNextWorkRequired(&blocks[6499], nullptr, consensus);
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BOOST_CHECK_EQUAL(idealBits, anchorBits);
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// Block 6501 after a very fast previous block: target must decrease
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// (difficulty increases).
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blocks[6500].nTime =
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blocks[6499].nTime + consensus.nPowTargetSpacing / 10;
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const unsigned int fastBits =
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GetNextWorkRequired(&blocks[6500], nullptr, consensus);
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arith_uint256 fastTarget;
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fastTarget.SetCompact(fastBits);
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arith_uint256 anchorTarget;
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anchorTarget.SetCompact(anchorBits);
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BOOST_CHECK(fastTarget < anchorTarget);
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// Block 6501 after a slow previous block: target must increase
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// (difficulty decreases).
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blocks[6500].nTime =
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blocks[6499].nTime + consensus.nPowTargetSpacing * 3;
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const unsigned int slowBits =
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GetNextWorkRequired(&blocks[6500], nullptr, consensus);
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arith_uint256 slowTarget;
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slowTarget.SetCompact(slowBits);
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BOOST_CHECK(slowTarget > anchorTarget);
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// Extreme delay must never produce a target above powLimit.
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blocks[6500].nTime =
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blocks[6499].nTime + consensus.asertHalfLife * 16;
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const unsigned int extremeSlowBits =
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GetNextWorkRequired(&blocks[6500], nullptr, consensus);
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BOOST_CHECK_EQUAL(
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extremeSlowBits,
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UintToArith256(consensus.powLimit).GetCompact());
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}
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BOOST_AUTO_TEST_CASE(ASERT_reference_vector_run04_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 = 2;
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consensus.asertHalfLife = 2 * 24 * 60 * 60;
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std::vector<CBlockIndex> blocks(3);
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blocks[0].pprev = nullptr;
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blocks[0].nHeight = 0;
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blocks[0].nTime = 0;
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blocks[0].nBits = 0x01010000;
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blocks[1].pprev = &blocks[0];
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blocks[1].nHeight = 1;
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blocks[1].nTime = 600;
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blocks[1].nBits = 0x01010000;
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// BCHN official ASERT run04 vector:
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// anchor height = 1
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// anchor ancestor time = 0
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// evaluation height = 2
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// evaluation time = 174000
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// expected next target = 0x01020000
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blocks[2].pprev = &blocks[1];
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blocks[2].nHeight = 2;
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blocks[2].nTime = 174000;
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blocks[2].nBits = 0x01010000;
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const unsigned int result =
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GetNextWorkRequired(&blocks[2], nullptr, consensus);
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BOOST_CHECK_EQUAL(result, 0x01020000U);
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}
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BOOST_AUTO_TEST_CASE(ASERT_reference_vector_run05_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 = 2;
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consensus.asertHalfLife = 2 * 24 * 60 * 60;
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std::vector<CBlockIndex> blocks(291);
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blocks[0].pprev = nullptr;
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blocks[0].nHeight = 0;
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blocks[0].nTime = 0;
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blocks[0].nBits = 0x1d00ffff;
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blocks[1].pprev = &blocks[0];
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blocks[1].nHeight = 1;
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blocks[1].nTime = 600;
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blocks[1].nBits = 0x1d00ffff;
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// BCHN official ASERT run05 vector, iteration 1:
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blocks[2].pprev = &blocks[1];
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blocks[2].nHeight = 2;
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blocks[2].nTime = 0;
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blocks[2].nBits = 0x1d00ffff;
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BOOST_CHECK_EQUAL(
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GetNextWorkRequired(&blocks[2], nullptr, consensus),
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0x1d00fec5U);
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// BCHN official ASERT run05 vector, iteration 2:
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// evaluation height = 290, time = 0
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for (int h = 3; h <= 290; ++h) {
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blocks[h].pprev = &blocks[h - 1];
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blocks[h].nHeight = h;
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blocks[h].nTime = 0;
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blocks[h].nBits = 0x1d00ffff;
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}
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BOOST_CHECK_EQUAL(
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GetNextWorkRequired(&blocks[290], nullptr, consensus),
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0x1c7f62c0U);
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}
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BOOST_AUTO_TEST_CASE(ASERT_reference_vector_run06_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 = 2;
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consensus.asertHalfLife = 2 * 24 * 60 * 60;
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std::vector<CBlockIndex> blocks(13);
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blocks[0].pprev = nullptr;
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blocks[0].nHeight = 0;
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blocks[0].nTime = 0;
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blocks[0].nBits = 0x1802aee8;
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blocks[1].pprev = &blocks[0];
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blocks[1].nHeight = 1;
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blocks[1].nTime = 600;
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blocks[1].nBits = 0x1802aee8;
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const int64_t times[] = {
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0, 600,
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1200, 1310, 1327, 1739, 2219, 2604,
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2746, 7099, 7099, 7657, 8626
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};
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const unsigned int expected[] = {
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0,
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0,
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0x1802aee8U,
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0x1802ad91U,
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0x1802abf8U,
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0x1802ab73U,
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0x1802ab20U,
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0x1802aa89U,
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0x1802a94bU,
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0x1802b39cU,
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0x1802b1f2U,
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0x1802b1d4U,
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0x1802b2dbU
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};
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for (int h = 2; h <= 12; ++h) {
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blocks[h].pprev = &blocks[h - 1];
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blocks[h].nHeight = h;
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blocks[h].nTime = times[h];
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blocks[h].nBits = 0x1802aee8;
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BOOST_CHECK_EQUAL(
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GetNextWorkRequired(&blocks[h], nullptr, consensus),
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expected[h]);
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}
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}
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BOOST_AUTO_TEST_SUITE_END()
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