120 lines
5.6 KiB
Rust
120 lines
5.6 KiB
Rust
// Written in 2014 by Andrew Poelstra <apoelstra@wpsoftware.net>
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// SPDX-License-Identifier: CC0-1.0
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//! Bitcoin consensus parameters.
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//!
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//! This module provides a predefined set of parameters for different Bitcoin
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//! chains (such as mainnet, testnet).
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//!
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use crate::network::constants::Network;
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use crate::pow::Work;
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/// Parameters that influence chain consensus.
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#[non_exhaustive]
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#[derive(Debug, Clone)]
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pub struct Params {
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/// Network for which parameters are valid.
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pub network: Network,
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/// Time when BIP16 becomes active.
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pub bip16_time: u32,
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/// Block height at which BIP34 becomes active.
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pub bip34_height: u32,
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/// Block height at which BIP65 becomes active.
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pub bip65_height: u32,
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/// Block height at which BIP66 becomes active.
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pub bip66_height: u32,
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/// Minimum blocks including miner confirmation of the total of 2016 blocks in a retargeting period,
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/// (nPowTargetTimespan / nPowTargetSpacing) which is also used for BIP9 deployments.
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/// Examples: 1916 for 95%, 1512 for testchains.
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pub rule_change_activation_threshold: u32,
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/// Number of blocks with the same set of rules.
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pub miner_confirmation_window: u32,
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/// Proof of work limit value. It contains the lowest possible difficulty.
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///
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/// Note that this value differs from Bitcoin Core's powLimit field in that this value is
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/// attainable, but Bitcoin Core's is not. Specifically, because targets in Bitcoin are always
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/// rounded to the nearest float expressible in "compact form", not all targets are attainable.
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/// Still, this should not affect consensus as the only place where the non-compact form of
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/// this is used in Bitcoin Core's consensus algorithm is in comparison and there are no
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/// compact-expressible values between Bitcoin Core's and the limit expressed here.
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pub pow_limit: Work,
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/// Expected amount of time to mine one block.
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pub pow_target_spacing: u64,
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/// Difficulty recalculation interval.
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pub pow_target_timespan: u64,
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/// Determines whether minimal difficulty may be used for blocks or not.
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pub allow_min_difficulty_blocks: bool,
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/// Determines whether retargeting is disabled for this network or not.
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pub no_pow_retargeting: bool,
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}
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impl Params {
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/// Creates parameters set for the given network.
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pub fn new(network: Network) -> Self {
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match network {
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Network::Bitcoin => Params {
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network: Network::Bitcoin,
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bip16_time: 1333238400, // Apr 1 2012
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bip34_height: 227931, // 000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8
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bip65_height: 388381, // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
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bip66_height: 363725, // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
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rule_change_activation_threshold: 1916, // 95%
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miner_confirmation_window: 2016,
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pow_limit: Work::MAINNET_MIN,
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pow_target_spacing: 10 * 60, // 10 minutes.
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pow_target_timespan: 14 * 24 * 60 * 60, // 2 weeks.
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allow_min_difficulty_blocks: false,
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no_pow_retargeting: false,
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},
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Network::Testnet => Params {
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network: Network::Testnet,
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bip16_time: 1333238400, // Apr 1 2012
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bip34_height: 21111, // 0000000023b3a96d3484e5abb3755c413e7d41500f8e2a5c3f0dd01299cd8ef8
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bip65_height: 581885, // 00000000007f6655f22f98e72ed80d8b06dc761d5da09df0fa1dc4be4f861eb6
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bip66_height: 330776, // 000000002104c8c45e99a8853285a3b592602a3ccde2b832481da85e9e4ba182
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rule_change_activation_threshold: 1512, // 75%
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miner_confirmation_window: 2016,
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pow_limit: Work::TESTNET_MIN,
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pow_target_spacing: 10 * 60, // 10 minutes.
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pow_target_timespan: 14 * 24 * 60 * 60, // 2 weeks.
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allow_min_difficulty_blocks: true,
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no_pow_retargeting: false,
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},
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Network::Signet => Params {
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network: Network::Signet,
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bip16_time: 1333238400, // Apr 1 2012
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bip34_height: 1,
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bip65_height: 1,
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bip66_height: 1,
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rule_change_activation_threshold: 1916, // 95%
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miner_confirmation_window: 2016,
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pow_limit: Work::SIGNET_MIN,
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pow_target_spacing: 10 * 60, // 10 minutes.
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pow_target_timespan: 14 * 24 * 60 * 60, // 2 weeks.
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allow_min_difficulty_blocks: false,
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no_pow_retargeting: false,
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},
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Network::Regtest => Params {
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network: Network::Regtest,
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bip16_time: 1333238400, // Apr 1 2012
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bip34_height: 100000000, // not activated on regtest
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bip65_height: 1351,
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bip66_height: 1251, // used only in rpc tests
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rule_change_activation_threshold: 108, // 75%
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miner_confirmation_window: 144,
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pow_limit: Work::REGTEST_MIN,
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pow_target_spacing: 10 * 60, // 10 minutes.
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pow_target_timespan: 14 * 24 * 60 * 60, // 2 weeks.
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allow_min_difficulty_blocks: true,
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no_pow_retargeting: true,
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},
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}
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}
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/// Calculates the number of blocks between difficulty adjustments.
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pub fn difficulty_adjustment_interval(&self) -> u64 {
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self.pow_target_timespan / self.pow_target_spacing
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}
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}
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