63 lines
2.6 KiB
Rust
63 lines
2.6 KiB
Rust
// Rust Bitcoin Library
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// Written in 2014 by
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// Andrew Poelstra <apoelstra@wpsoftware.net>
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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//! Bitcoin policy.
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//!
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//! This module exposes some constants and functions used in the reference
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//! implementation and which, as a consequence, define some network rules.
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//!
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//! # *Warning*
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//! While the constants present in this module are very unlikely to change, they do not define
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//! Bitcoin. As such they must not be relied upon as if they were consensus rules.
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//!
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//! These values were taken from bitcoind v0.21.1 (194b9b8792d9b0798fdb570b79fa51f1d1f5ebaf).
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//!
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use super::blockdata::constants::{MAX_BLOCK_SIGOPS_COST, WITNESS_SCALE_FACTOR};
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use core::cmp;
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/// Maximum weight of a transaction for it to be relayed by most nodes on the network
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pub const MAX_STANDARD_TX_WEIGHT: u32 = 400_000;
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/// Minimum non-witness size for a standard transaction (1 segwit input + 1 P2WPKH output = 82 bytes)
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pub const MIN_STANDARD_TX_NONWITNESS_SIZE: u32 = 82;
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/// Maximum number of sigops in a standard tx.
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pub const MAX_STANDARD_TX_SIGOPS_COST: u32 = MAX_BLOCK_SIGOPS_COST as u32 / 5;
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/// The minimum incremental *feerate* (despite the name), in sats per virtual kilobyte for RBF.
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pub const DEFAULT_INCREMENTAL_RELAY_FEE: u32 = 1_000;
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/// The number of bytes equivalent per signature operation. Affects transaction relay through the
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/// virtual size computation.
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pub const DEFAULT_BYTES_PER_SIGOP: u32 = 20;
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/// The minimum feerate, in sats per kilo-virtualbyte, for defining dust. An output is considered
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/// dust if spending it under this feerate would cost more in fee.
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pub const DUST_RELAY_TX_FEE: u32 = 3_000;
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/// Minimum feerate, in sats per virtual kilobyte, for a transaction to be relayed by most nodes on
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/// the network.
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pub const DEFAULT_MIN_RELAY_TX_FEE: u32 = 1_000;
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/// Default number of hours for an unconfirmed transaction to expire in most of the network nodes'
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/// mempools.
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pub const DEFAULT_MEMPOOL_EXPIRY: u32 = 336;
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/// The virtual transaction size, as computed by default by bitcoind node.
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pub fn get_virtual_tx_size(weight: i64, n_sigops: i64) -> i64 {
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(cmp::max(weight, n_sigops * DEFAULT_BYTES_PER_SIGOP as i64) + WITNESS_SCALE_FACTOR as i64 - 1)
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/ WITNESS_SCALE_FACTOR as i64
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}
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