// Rust Bitcoin Library // Written in 2014 by // Andrew Poelstra // // 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 . // //! 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 prelude::*; use core::default::Default; use hashes::hex::{self, HexIterator}; use hashes::sha256d; use blockdata::opcodes; use blockdata::script; use blockdata::transaction::{OutPoint, Transaction, TxOut, TxIn}; use blockdata::block::{Block, BlockHeader}; use blockdata::witness::Witness; use network::constants::Network; use 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, 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, } } } } #[cfg(test)] mod test { use core::default::Default; use hashes::hex::FromHex; use network::constants::Network; use consensus::encode::serialize; use blockdata::constants::{genesis_block, bitcoin_genesis_tx}; use blockdata::constants::{MAX_SEQUENCE, COIN_VALUE}; #[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()); } }