blvm-protocol 0.1.29

//! Genesis Blocks
//!
//! Provides actual Bitcoin genesis blocks for mainnet, testnet, and regtest networks.

use blvm_consensus::types::*;

/// Create Bitcoin mainnet genesis block
pub fn mainnet_genesis() -> Block {
    // Bitcoin mainnet genesis block
    // Hash: 0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
    // Merkle root must be in Bitcoin internal byte order (reversed from display)
    Block {
        header: BlockHeader {
            version: 1,
            prev_block_hash: [0u8; 32], // All zeros for genesis
            merkle_root: [
                0x3b, 0xa3, 0xed, 0xfd, 0x7a, 0x7b, 0x12, 0xb2, 0x7a, 0xc7, 0x2c, 0x3e, 0x67, 0x76,
                0x8f, 0x61, 0x7f, 0xc8, 0x1b, 0xc3, 0x88, 0x8a, 0x51, 0x32, 0x3a, 0x9f, 0xb8, 0xaa,
                0x4b, 0x1e, 0x5e, 0x4a,
            ],
            timestamp: 1231006505, // Jan 3, 2009
            bits: 0x1d00ffff,
            nonce: 2083236893,
        },
        transactions: vec![Transaction {
            version: 1,
            inputs: crate::tx_inputs![TransactionInput {
                prevout: OutPoint {
                    hash: [0u8; 32],
                    index: 0xffffffff,
                },
                script_sig: vec![
                    0x04, 0xff, 0xff, 0x00, 0x1d, 0x01, 0x04, 0x45, 0x54, 0x68, 0x65, 0x20, 0x54,
                    0x69, 0x6d, 0x65, 0x73, 0x20, 0x30, 0x33, 0x2f, 0x4a, 0x61, 0x6e, 0x2f, 0x32,
                    0x30, 0x30, 0x39, 0x20, 0x43, 0x68, 0x61, 0x6e, 0x63, 0x65, 0x6c, 0x6c, 0x6f,
                    0x72, 0x20, 0x6f, 0x6e, 0x20, 0x62, 0x72, 0x69, 0x6e, 0x6b, 0x20, 0x6f, 0x66,
                    0x20, 0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64, 0x20, 0x62, 0x61, 0x69, 0x6c, 0x6f,
                    0x75, 0x74, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x62, 0x61, 0x6e, 0x6b, 0x73,
                ], // "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks"
                sequence: 0xffffffff,
            }],
            outputs: crate::tx_outputs![TransactionOutput {
                value: 50_0000_0000, // 50 BTC in satoshis
                script_pubkey: vec![
                    0x41, 0x04, 0x67, 0x8a, 0xfd, 0xb0, 0xfe, 0x55, 0x48, 0x27, 0x19, 0x67, 0xf1,
                    0xa6, 0x71, 0x30, 0xb7, 0x10, 0x5c, 0xd6, 0xa8, 0x28, 0xe0, 0x39, 0x09, 0xa6,
                    0x79, 0x62, 0xe0, 0xea, 0x1f, 0x61, 0xde, 0xb6, 0x49, 0xf6, 0xbc, 0x3f, 0x4c,
                    0xef, 0x38, 0xc4, 0xf3, 0x55, 0x04, 0xe5, 0x1e, 0xc1, 0x12, 0xde, 0x5c, 0x38,
                    0x4d, 0xf7, 0xba, 0x0b, 0x8d, 0x57, 0x8a, 0x4c, 0x70, 0x2b, 0x6b, 0xf1, 0x1d,
                    0x5f, 0xac,
                ],
            }],
            lock_time: 0,
        }]
        .into_boxed_slice(),
    }
}

/// Create Bitcoin testnet genesis block
pub fn testnet_genesis() -> Block {
    // Bitcoin testnet genesis block
    // Hash: 0x000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943
    // Same coinbase as mainnet → same merkle root (internal byte order)
    Block {
        header: BlockHeader {
            version: 1,
            prev_block_hash: [0u8; 32],
            merkle_root: [
                0x3b, 0xa3, 0xed, 0xfd, 0x7a, 0x7b, 0x12, 0xb2, 0x7a, 0xc7, 0x2c, 0x3e, 0x67, 0x76,
                0x8f, 0x61, 0x7f, 0xc8, 0x1b, 0xc3, 0x88, 0x8a, 0x51, 0x32, 0x3a, 0x9f, 0xb8, 0xaa,
                0x4b, 0x1e, 0x5e, 0x4a,
            ],
            timestamp: 1296688602, // Testnet genesis timestamp
            bits: 0x1d00ffff,
            nonce: 414098458,
        },
        transactions: vec![Transaction {
            version: 1,
            inputs: crate::tx_inputs![TransactionInput {
                prevout: OutPoint {
                    hash: [0u8; 32],
                    index: 0xffffffff,
                },
                script_sig: vec![
                    0x04, 0xff, 0xff, 0x00, 0x1d, 0x01, 0x04, 0x45, 0x54, 0x68, 0x65, 0x20, 0x54,
                    0x69, 0x6d, 0x65, 0x73, 0x20, 0x30, 0x33, 0x2f, 0x4a, 0x61, 0x6e, 0x2f, 0x32,
                    0x30, 0x30, 0x39, 0x20, 0x43, 0x68, 0x61, 0x6e, 0x63, 0x65, 0x6c, 0x6c, 0x6f,
                    0x72, 0x20, 0x6f, 0x6e, 0x20, 0x62, 0x72, 0x69, 0x6e, 0x6b, 0x20, 0x6f, 0x66,
                    0x20, 0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64, 0x20, 0x62, 0x61, 0x69, 0x6c, 0x6f,
                    0x75, 0x74, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x62, 0x61, 0x6e, 0x6b, 0x73,
                ],
                sequence: 0xffffffff,
            }],
            outputs: crate::tx_outputs![TransactionOutput {
                value: 50_0000_0000,
                script_pubkey: vec![
                    0x41, 0x04, 0x67, 0x8a, 0xfd, 0xb0, 0xfe, 0x55, 0x48, 0x27, 0x19, 0x67, 0xf1,
                    0xa6, 0x71, 0x30, 0xb7, 0x10, 0x5c, 0xd6, 0xa8, 0x28, 0xe0, 0x39, 0x09, 0xa6,
                    0x79, 0x62, 0xe0, 0xea, 0x1f, 0x61, 0xde, 0xb6, 0x49, 0xf6, 0xbc, 0x3f, 0x4c,
                    0xef, 0x38, 0xc4, 0xf3, 0x55, 0x04, 0xe5, 0x1e, 0xc1, 0x12, 0xde, 0x5c, 0x38,
                    0x4d, 0xf7, 0xba, 0x0b, 0x8d, 0x57, 0x8a, 0x4c, 0x70, 0x2b, 0x6b, 0xf1, 0x1d,
                    0x5f, 0xac,
                ],
            }],
            lock_time: 0,
        }]
        .into_boxed_slice(),
    }
}

/// Create Bitcoin regtest genesis block
pub fn regtest_genesis() -> Block {
    // Bitcoin regtest genesis block
    // Hash: 0x0f9188f13cb7b2c28f4514ac48c96e0d99c5cb2f5e33a1748f0baf3323f6e5c0
    // Same coinbase as mainnet → same merkle root (internal byte order)
    Block {
        header: BlockHeader {
            version: 1,
            prev_block_hash: [0u8; 32],
            merkle_root: [
                0x3b, 0xa3, 0xed, 0xfd, 0x7a, 0x7b, 0x12, 0xb2, 0x7a, 0xc7, 0x2c, 0x3e, 0x67, 0x76,
                0x8f, 0x61, 0x7f, 0xc8, 0x1b, 0xc3, 0x88, 0x8a, 0x51, 0x32, 0x3a, 0x9f, 0xb8, 0xaa,
                0x4b, 0x1e, 0x5e, 0x4a,
            ],
            timestamp: 1296688602, // Same as testnet for regtest
            bits: 0x207fffff,      // Easier difficulty
            nonce: 2,
        },
        transactions: vec![Transaction {
            version: 1,
            inputs: crate::tx_inputs![TransactionInput {
                prevout: OutPoint {
                    hash: [0u8; 32],
                    index: 0xffffffff,
                },
                script_sig: vec![
                    0x04, 0xff, 0xff, 0x00, 0x1d, 0x01, 0x04, 0x45, 0x54, 0x68, 0x65, 0x20, 0x54,
                    0x69, 0x6d, 0x65, 0x73, 0x20, 0x30, 0x33, 0x2f, 0x4a, 0x61, 0x6e, 0x2f, 0x32,
                    0x30, 0x30, 0x39, 0x20, 0x43, 0x68, 0x61, 0x6e, 0x63, 0x65, 0x6c, 0x6c, 0x6f,
                    0x72, 0x20, 0x6f, 0x6e, 0x20, 0x62, 0x72, 0x69, 0x6e, 0x6b, 0x20, 0x6f, 0x66,
                    0x20, 0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64, 0x20, 0x62, 0x61, 0x69, 0x6c, 0x6f,
                    0x75, 0x74, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x62, 0x61, 0x6e, 0x6b, 0x73,
                ],
                sequence: 0xffffffff,
            }],
            outputs: crate::tx_outputs![TransactionOutput {
                value: 50_0000_0000,
                script_pubkey: vec![
                    0x41, 0x04, 0x67, 0x8a, 0xfd, 0xb0, 0xfe, 0x55, 0x48, 0x27, 0x19, 0x67, 0xf1,
                    0xa6, 0x71, 0x30, 0xb7, 0x10, 0x5c, 0xd6, 0xa8, 0x28, 0xe0, 0x39, 0x09, 0xa6,
                    0x79, 0x62, 0xe0, 0xea, 0x1f, 0x61, 0xde, 0xb6, 0x49, 0xf6, 0xbc, 0x3f, 0x4c,
                    0xef, 0x38, 0xc4, 0xf3, 0x55, 0x04, 0xe5, 0x1e, 0xc1, 0x12, 0xde, 0x5c, 0x38,
                    0x4d, 0xf7, 0xba, 0x0b, 0x8d, 0x57, 0x8a, 0x4c, 0x70, 0x2b, 0x6b, 0xf1, 0x1d,
                    0x5f, 0xac,
                ],
            }],
            lock_time: 0,
        }]
        .into_boxed_slice(),
    }
}

/// Create Bitcoin testnet4 genesis block (BIP94).
///
/// Hash: `00000000da84f2bafbbc53dee25a72ae507ff4914b867c565be350b0da8bf043`
pub fn testnet4_genesis() -> Block {
    let msg = b"03/May/2024 000000000000000000001ebd58c244970b3aa9d783bb001011fbe8ea8e98e00e";
    let mut script_sig = vec![
        0x04,
        0xff,
        0xff,
        0x00,
        0x1d,
        0x01,
        0x04,
        0x4c,
        msg.len() as u8,
    ];
    script_sig.extend_from_slice(msg);
    let mut script_pubkey = vec![0x21];
    script_pubkey.extend_from_slice(&[0u8; 33]);
    script_pubkey.push(0xac);
    let coinbase = Transaction {
        version: 1,
        inputs: crate::tx_inputs![TransactionInput {
            prevout: OutPoint {
                hash: [0u8; 32],
                index: 0xffffffff,
            },
            script_sig,
            sequence: 0xffffffff,
        }],
        outputs: crate::tx_outputs![TransactionOutput {
            value: 50_0000_0000,
            script_pubkey,
        }],
        lock_time: 0,
    };
    let merkle_root =
        blvm_consensus::mining::calculate_merkle_root(std::slice::from_ref(&coinbase))
            .expect("testnet4 genesis merkle root");
    Block {
        header: BlockHeader {
            version: 1,
            prev_block_hash: [0u8; 32],
            merkle_root,
            timestamp: 1_714_777_860,
            bits: 0x1d00ffff,
            nonce: 393_743_547,
        },
        transactions: vec![coinbase].into_boxed_slice(),
    }
}

/// Create Bitcoin signet genesis block (default public signet, BIP325)
pub fn signet_genesis() -> Block {
    // Hash: 0x00000008819873e925422c1ff0f99f7cc9bbb232af63a077a480a3633bee1ef6
    Block {
        header: BlockHeader {
            version: 1,
            prev_block_hash: [0u8; 32],
            merkle_root: [
                0x3b, 0xa3, 0xed, 0xfd, 0x7a, 0x7b, 0x12, 0xb2, 0x7a, 0xc7, 0x2c, 0x3e, 0x67, 0x76,
                0x8f, 0x61, 0x7f, 0xc8, 0x1b, 0xc3, 0x88, 0x8a, 0x51, 0x32, 0x3a, 0x9f, 0xb8, 0xaa,
                0x4b, 0x1e, 0x5e, 0x4a,
            ],
            timestamp: 1_598_918_400,
            bits: 0x1e0377ae,
            nonce: 52_613_770,
        },
        transactions: vec![Transaction {
            version: 1,
            inputs: crate::tx_inputs![TransactionInput {
                prevout: OutPoint {
                    hash: [0u8; 32],
                    index: 0xffffffff,
                },
                script_sig: vec![
                    0x04, 0xff, 0xff, 0x00, 0x1d, 0x01, 0x04, 0x45, 0x54, 0x68, 0x65, 0x20, 0x54,
                    0x69, 0x6d, 0x65, 0x73, 0x20, 0x30, 0x33, 0x2f, 0x4a, 0x61, 0x6e, 0x2f, 0x32,
                    0x30, 0x30, 0x39, 0x20, 0x43, 0x68, 0x61, 0x6e, 0x63, 0x65, 0x6c, 0x6c, 0x6f,
                    0x72, 0x20, 0x6f, 0x6e, 0x20, 0x62, 0x72, 0x69, 0x6e, 0x6b, 0x20, 0x6f, 0x66,
                    0x20, 0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64, 0x20, 0x62, 0x61, 0x69, 0x6c, 0x6f,
                    0x75, 0x74, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x62, 0x61, 0x6e, 0x6b, 0x73,
                ],
                sequence: 0xffffffff,
            }],
            outputs: crate::tx_outputs![TransactionOutput {
                value: 50_0000_0000,
                script_pubkey: vec![
                    0x41, 0x04, 0x67, 0x8a, 0xfd, 0xb0, 0xfe, 0x55, 0x48, 0x27, 0x19, 0x67, 0xf1,
                    0xa6, 0x71, 0x30, 0xb7, 0x10, 0x5c, 0xd6, 0xa8, 0x28, 0xe0, 0x39, 0x09, 0xa6,
                    0x79, 0x62, 0xe0, 0xea, 0x1f, 0x61, 0xde, 0xb6, 0x49, 0xf6, 0xbc, 0x3f, 0x4c,
                    0xef, 0x38, 0xc4, 0xf3, 0x55, 0x04, 0xe5, 0x1e, 0xc1, 0x12, 0xde, 0x5c, 0x38,
                    0x4d, 0xf7, 0xba, 0x0b, 0x8d, 0x57, 0x8a, 0x4c, 0x70, 0x2b, 0x6b, 0xf1, 0x1d,
                    0x5f, 0xac,
                ],
            }],
            lock_time: 0,
        }]
        .into_boxed_slice(),
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn testnet4_genesis_matches_core() {
        let block = testnet4_genesis();
        let hash = blvm_consensus::block::block_header_hash(&block.header);
        let mut display = hash;
        display.reverse();
        assert_eq!(
            hex_encode(&display),
            "00000000da84f2bafbbc53dee25a72ae507ff4914b867c565be350b0da8bf043"
        );
        let mut merkle = block.header.merkle_root;
        merkle.reverse();
        assert_eq!(
            hex_encode(&merkle),
            "7aa0a7ae1e223414cb807e40cd57e667b718e42aaf9306db9102fe28912b7b4e"
        );
    }

    fn hex_encode(bytes: &[u8]) -> String {
        const HEX: &[u8; 16] = b"0123456789abcdef";
        let mut out = String::with_capacity(bytes.len() * 2);
        for b in bytes {
            out.push(HEX[(b >> 4) as usize] as char);
            out.push(HEX[(b & 0xf) as usize] as char);
        }
        out
    }
}