Differential D16729 Diff 49592 src/policy/block/rtt.cpp

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src/policy/block/rtt.cpp

	// Copyright (c) 2024 The Bitcoin developers			// Copyright (c) 2024 The Bitcoin developers
	// Distributed under the MIT software license, see the accompanying			// Distributed under the MIT software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.			// file COPYING or http://www.opensource.org/licenses/mit-license.php.

	#include <policy/block/rtt.h>			#include <policy/block/rtt.h>

	#include <arith_uint256.h>			#include <arith_uint256.h>
	#include <blockindex.h>			#include <blockindex.h>
				#include <common/args.h>
	#include <consensus/params.h>			#include <consensus/params.h>
				#include <logging.h>
	#include <pow/pow.h>			#include <pow/pow.h>
				#include <timedata.h>

				#include <tinyformat.h>

	#include <algorithm>			#include <algorithm>
	#include <cmath>			#include <cmath>

				bool RTTPolicy::operator()(BlockPolicyValidationState &state) {
				if (!gArgs.GetBoolArg("-enablertt", DEFAULT_ENABLE_RTT)) {
				return true;
				}

				if (!m_blockIndex.pprev) {
				return true;
				}

				auto rttWork = GetNextRTTWorkRequired(m_blockIndex.pprev,
				m_blockIndex.GetHeaderReceivedTime(),
				m_consensusParams);
				if (!rttWork.has_value()) {
				return true;
				}

				const int64_t diffTime = m_blockIndex.GetHeaderReceivedTime() -
				m_blockIndex.pprev->GetHeaderReceivedTime();

				if (!CheckProofOfWork(m_blockIndex.GetBlockHash(), *rttWork,
				m_consensusParams)) {
				return state.Invalid(
				BlockPolicyValidationResult::POLICY_VIOLATION, "policy-bad-rtt",
				strprintf(
				"Block %s at height %d violates the real time target %08x (%s "
				"> %s, time diff %ds)\n",
				m_blockIndex.GetBlockHash().ToString(), m_blockIndex.nHeight,
				*rttWork, m_blockIndex.GetBlockHash().ToString(),
				arith_uint256().SetCompact(*rttWork).ToString(), diffTime));
				}

				return true;
				}

	/**			/**
	* target(t) = target(prev_block) * RTT_CONSTANT_FACTOR * t^(RTT_K - 1)			* target(t) = target(prev_block) * RTT_CONSTANT_FACTOR * t^(RTT_K - 1)
	* Where t is the time since the previous block timestamp and RTT_K is an			* Where t is the time since the previous block timestamp and RTT_K is an
	* arbitrary integer >= 1.			* arbitrary integer >= 1.
	* The factor is computed as:			* The factor is computed as:
	* RTT_K * gamma(1 + 1/RTT_K)^RTT_K / (T^(RTT_K-1))			* RTT_K * gamma(1 + 1/RTT_K)^RTT_K / (T^(RTT_K-1))
	* Where T is the target time between blocks, aka 600s.			* Where T is the target time between blocks, aka 600s.
	*			*
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