/
constants.rs
323 lines (291 loc) · 13 KB
/
constants.rs
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// Rust Bitcoin Library
// Written in 2014 by
// Andrew Poelstra <apoelstra@wpsoftware.net>
//
// To the extent possible under law, the author(s) have dedicated all
// copyright and related and neighboring rights to this software to
// the public domain worldwide. This software is distributed without
// any warranty.
//
// You should have received a copy of the CC0 Public Domain Dedication
// along with this software.
// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
//
//! Blockdata constants.
//!
//! This module provides various constants relating to the blockchain and
//! consensus code. In particular, it defines the genesis block and its
//! single transaction.
//!
use crate::prelude::*;
use core::default::Default;
use crate::hashes::hex::{self, HexIterator};
use crate::hashes::sha256d;
use crate::blockdata::opcodes;
use crate::blockdata::script;
use crate::blockdata::transaction::{OutPoint, Transaction, TxOut, TxIn};
use crate::blockdata::block::{Block, BlockHeader};
use crate::blockdata::witness::Witness;
use crate::network::constants::Network;
use crate::util::uint::Uint256;
/// The maximum allowable sequence number
pub const MAX_SEQUENCE: u32 = 0xFFFFFFFF;
/// How many satoshis are in "one bitcoin"
pub const COIN_VALUE: u64 = 100_000_000;
/// How many seconds between blocks we expect on average
pub const TARGET_BLOCK_SPACING: u32 = 600;
/// How many blocks between diffchanges
pub const DIFFCHANGE_INTERVAL: u32 = 2016;
/// How much time on average should occur between diffchanges
pub const DIFFCHANGE_TIMESPAN: u32 = 14 * 24 * 3600;
/// The maximum allowed weight for a block, see BIP 141 (network rule)
pub const MAX_BLOCK_WEIGHT: u32 = 4_000_000;
/// The minimum transaction weight for a valid serialized transaction
pub const MIN_TRANSACTION_WEIGHT: u32 = 4 * 60;
/// The factor that non-witness serialization data is multiplied by during weight calculation
pub const WITNESS_SCALE_FACTOR: usize = 4;
/// The maximum allowed number of signature check operations in a block
pub const MAX_BLOCK_SIGOPS_COST: i64 = 80_000;
/// Mainnet (bitcoin) pubkey address prefix.
pub const PUBKEY_ADDRESS_PREFIX_MAIN: u8 = 0; // 0x00
/// Mainnet (bitcoin) script address prefix.
pub const SCRIPT_ADDRESS_PREFIX_MAIN: u8 = 5; // 0x05
/// Test (tesnet, signet, regtest) pubkey address prefix.
pub const PUBKEY_ADDRESS_PREFIX_TEST: u8 = 111; // 0x6f
/// Test (tesnet, signet, regtest) script address prefix.
pub const SCRIPT_ADDRESS_PREFIX_TEST: u8 = 196; // 0xc4
/// The maximum allowed script size.
pub const MAX_SCRIPT_ELEMENT_SIZE: usize = 520;
/// How may blocks between halvings.
pub const SUBSIDY_HALVING_INTERVAL: u32 = 210_000;
/// In Bitcoind this is insanely described as ~((u256)0 >> 32)
pub fn max_target(_: Network) -> Uint256 {
Uint256::from_u64(0xFFFF).unwrap() << 208
}
/// The maximum value allowed in an output (useful for sanity checking,
/// since keeping everything below this value should prevent overflows
/// if you are doing anything remotely sane with monetary values).
pub fn max_money(_: Network) -> u64 {
21_000_000 * COIN_VALUE
}
/// Constructs and returns the coinbase (and only) transaction of the Bitcoin genesis block
fn bitcoin_genesis_tx() -> Transaction {
// Base
let mut ret = Transaction {
version: 1,
lock_time: 0,
input: vec![],
output: vec![],
};
// Inputs
let in_script = script::Builder::new().push_scriptint(486604799)
.push_scriptint(4)
.push_slice(b"The Times 03/Jan/2009 Chancellor on brink of second bailout for banks")
.into_script();
ret.input.push(TxIn {
previous_output: OutPoint::null(),
script_sig: in_script,
sequence: MAX_SEQUENCE,
witness: Witness::default(),
});
// Outputs
let script_bytes: Result<Vec<u8>, hex::Error> =
HexIterator::new("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f").unwrap()
.collect();
let out_script = script::Builder::new()
.push_slice(script_bytes.unwrap().as_slice())
.push_opcode(opcodes::all::OP_CHECKSIG)
.into_script();
ret.output.push(TxOut {
value: 50 * COIN_VALUE,
script_pubkey: out_script
});
// end
ret
}
/// Constructs and returns the genesis block
pub fn genesis_block(network: Network) -> Block {
let txdata = vec![bitcoin_genesis_tx()];
let hash: sha256d::Hash = txdata[0].txid().into();
let merkle_root = hash.into();
match network {
Network::Bitcoin => {
Block {
header: BlockHeader {
version: 1,
prev_blockhash: Default::default(),
merkle_root,
time: 1231006505,
bits: 0x1d00ffff,
nonce: 2083236893
},
txdata,
}
}
Network::Testnet => {
Block {
header: BlockHeader {
version: 1,
prev_blockhash: Default::default(),
merkle_root,
time: 1296688602,
bits: 0x1d00ffff,
nonce: 414098458
},
txdata,
}
}
Network::Signet => {
Block {
header: BlockHeader {
version: 1,
prev_blockhash: Default::default(),
merkle_root,
time: 1598918400,
bits: 0x1e0377ae,
nonce: 52613770
},
txdata,
}
}
Network::Regtest => {
Block {
header: BlockHeader {
version: 1,
prev_blockhash: Default::default(),
merkle_root,
time: 1296688602,
bits: 0x207fffff,
nonce: 2
},
txdata,
}
}
}
}
// Mainnet value can be verified at https://github.com/lightning/bolts/blob/master/00-introduction.md
const GENESIS_BLOCK_HASH_BITCOIN: [u8; 32] = [111, 226, 140, 10, 182, 241, 179, 114, 193, 166, 162, 70, 174, 99, 247, 79, 147, 30, 131, 101, 225, 90, 8, 156, 104, 214, 25, 0, 0, 0, 0, 0];
const GENESIS_BLOCK_HASH_TESTNET: [u8; 32] = [67, 73, 127, 215, 248, 38, 149, 113, 8, 244, 163, 15, 217, 206, 195, 174, 186, 121, 151, 32, 132, 233, 14, 173, 1, 234, 51, 9, 0, 0, 0, 0];
const GENESIS_BLOCK_HASH_SIGNET: [u8; 32] = [246, 30, 238, 59, 99, 163, 128, 164, 119, 160, 99, 175, 50, 178, 187, 201, 124, 159, 249, 240, 31, 44, 66, 37, 233, 115, 152, 129, 8, 0, 0, 0];
const GENESIS_BLOCK_HASH_REGTEST: [u8; 32] = [6, 34, 110, 70, 17, 26, 11, 89, 202, 175, 18, 96, 67, 235, 91, 191, 40, 195, 79, 58, 94, 51, 42, 31, 199, 178, 183, 60, 241, 136, 145, 15];
/// The uniquely identifying hash of the target blockchain.
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct ChainHash([u8; 32]);
impl_array_newtype!(ChainHash, u8, 32);
impl_bytes_newtype!(ChainHash, 32);
impl ChainHash {
/// Returns the hash of the `network` genesis block for use as a chain hash.
///
/// See [BOLT 0](https://github.com/lightning/bolts/blob/ffeece3dab1c52efdb9b53ae476539320fa44938/00-introduction.md#chain_hash)
/// for specification.
pub fn using_genesis_block(network: Network) -> Self {
match network {
Network::Bitcoin => ChainHash(GENESIS_BLOCK_HASH_BITCOIN),
Network::Testnet => ChainHash(GENESIS_BLOCK_HASH_TESTNET),
Network::Signet => ChainHash(GENESIS_BLOCK_HASH_SIGNET),
Network::Regtest => ChainHash(GENESIS_BLOCK_HASH_REGTEST),
}
}
}
#[cfg(test)]
mod test {
use core::default::Default;
use super::*;
use crate::hashes::hex::FromHex;
use crate::network::constants::Network;
use crate::consensus::encode::serialize;
#[test]
fn bitcoin_genesis_first_transaction() {
let gen = bitcoin_genesis_tx();
assert_eq!(gen.version, 1);
assert_eq!(gen.input.len(), 1);
assert_eq!(gen.input[0].previous_output.txid, Default::default());
assert_eq!(gen.input[0].previous_output.vout, 0xFFFFFFFF);
assert_eq!(serialize(&gen.input[0].script_sig),
Vec::from_hex("4d04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73").unwrap());
assert_eq!(gen.input[0].sequence, MAX_SEQUENCE);
assert_eq!(gen.output.len(), 1);
assert_eq!(serialize(&gen.output[0].script_pubkey),
Vec::from_hex("434104678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5fac").unwrap());
assert_eq!(gen.output[0].value, 50 * COIN_VALUE);
assert_eq!(gen.lock_time, 0);
assert_eq!(format!("{:x}", gen.wtxid()),
"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b".to_string());
}
#[test]
fn bitcoin_genesis_full_block() {
let gen = genesis_block(Network::Bitcoin);
assert_eq!(gen.header.version, 1);
assert_eq!(gen.header.prev_blockhash, Default::default());
assert_eq!(format!("{:x}", gen.header.merkle_root),
"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b".to_string());
assert_eq!(gen.header.time, 1231006505);
assert_eq!(gen.header.bits, 0x1d00ffff);
assert_eq!(gen.header.nonce, 2083236893);
assert_eq!(format!("{:x}", gen.header.block_hash()),
"000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f".to_string());
}
#[test]
fn testnet_genesis_full_block() {
let gen = genesis_block(Network::Testnet);
assert_eq!(gen.header.version, 1);
assert_eq!(gen.header.prev_blockhash, Default::default());
assert_eq!(format!("{:x}", gen.header.merkle_root),
"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b".to_string());
assert_eq!(gen.header.time, 1296688602);
assert_eq!(gen.header.bits, 0x1d00ffff);
assert_eq!(gen.header.nonce, 414098458);
assert_eq!(format!("{:x}", gen.header.block_hash()),
"000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943".to_string());
}
#[test]
fn signet_genesis_full_block() {
let gen = genesis_block(Network::Signet);
assert_eq!(gen.header.version, 1);
assert_eq!(gen.header.prev_blockhash, Default::default());
assert_eq!(format!("{:x}", gen.header.merkle_root),
"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b".to_string());
assert_eq!(gen.header.time, 1598918400);
assert_eq!(gen.header.bits, 0x1e0377ae);
assert_eq!(gen.header.nonce, 52613770);
assert_eq!(format!("{:x}", gen.header.block_hash()),
"00000008819873e925422c1ff0f99f7cc9bbb232af63a077a480a3633bee1ef6".to_string());
}
// The *_chain_hash tests are sanity/regression tests, they verify that the const byte array
// representing the genesis block is the same as that created by hashing the genesis block.
fn chain_hash_and_genesis_block(network: Network) {
use hashes::{sha256, Hash};
// The genesis block hash is a double-sha256 and it is displayed backwards.
let genesis_hash = genesis_block(network).block_hash();
// We abuse the sha256 hash here so we get a LowerHex impl that does not print the hex backwards.
let hash = sha256::Hash::from_slice(&genesis_hash.into_inner()).unwrap();
let want = format!("{:02x}", hash);
let chain_hash = ChainHash::using_genesis_block(network);
let got = format!("{:02x}", chain_hash);
// Compare strings because the spec specifically states how the chain hash must encode to hex.
assert_eq!(got, want);
}
macro_rules! chain_hash_genesis_block {
($($test_name:ident, $network:expr);* $(;)*) => {
$(
#[test]
fn $test_name() {
chain_hash_and_genesis_block($network);
}
)*
}
}
chain_hash_genesis_block! {
mainnet_chain_hash_genesis_block, Network::Bitcoin;
testnet_chain_hash_genesis_block, Network::Testnet;
signet_chain_hash_genesis_block, Network::Signet;
regtest_chain_hash_genesis_block, Network::Regtest;
}
// Test vector taken from: https://github.com/lightning/bolts/blob/master/00-introduction.md
#[test]
fn mainnet_chain_hash_test_vector() {
let got = format!("{:x}", ChainHash::using_genesis_block(Network::Bitcoin));
let want = "6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000";
assert_eq!(got, want);
}
}