Protocol Specifications

Bitcoin Improvement Proposals (BIPs) implemented in BLVM. Consensus-critical behavior lives in blvm-consensus with tests, review, and BLVM Specification Lock proofs. See Formal Verification.

Consensus-Critical BIPs

Script Opcodes:

• BIP65 (CLTV, opcode 0xb1): Locktime validation (blvm-consensus/src/script/)
• BIP112 (CSV, opcode 0xb2): Relative locktime via sequence numbers (blvm-consensus/src/script/)
• BIP68: Relative locktime sequence encoding (used by BIP112)

Time Validation:

• BIP113: Median time-past for CLTV timestamp validation (blvm-consensus/src/block/mod.rs)

Transaction Features:

• BIP125 (RBF): Replace-by-fee with all 5 requirements (blvm-consensus/src/mempool.rs) with tests
• BIP141/143 (SegWit): Witness validation, weight calculation, P2WPKH/P2WSH (blvm-consensus/src/segwit.rs)
• BIP340/341/342 (Taproot): P2TR validation framework (blvm-consensus/src/taproot.rs)

Network Protocol BIPs

• BIP152: Compact block relay - short transaction IDs, block reconstruction (see Compact Blocks)
• BIP157/158: Client-side block filtering - GCS filter construction, integrated with network layer, works over all transports (see BIP157/158)
• BIP155 addrv2: Varint-length peer addresses (addrv2) on P2P wire (serialization in blvm-protocol wire—deserialize_addrv2 / serialize_addrv2; node handling in blvm-node protocol_adapter.rs, wire_dispatch.rs)
• BIP331: Package relay - efficient transaction relay (see Package Relay)

Application-Level BIPs

• BIP21: Bitcoin URI scheme (blvm-node/src/bip21.rs)
• BIP32/39/44: HD wallets, mnemonic phrases, standard derivation paths (blvm-node/src/wallet/)
• BIP70: Payment protocol (full reimplementation, blvm-node/src/network/bip70_handler.rs)
• BIP174: PSBT format for hardware wallet support (blvm-node/src/psbt.rs)
• BIP350/351: Bech32m for Taproot (P2TR), Bech32 for SegWit (blvm-node/src/bech32m.rs)

Experimental Features

Available in experimental build variant: UTXO commitments, BIP119 CTV (CheckTemplateVerify), Dandelion++ privacy relay, Stratum V2 mining protocol.