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Protocol Specifications

Bitcoin Improvement Proposals (BIPs) implemented in BLVM. Consensus-critical BIPs are formally verified. See Formal Verification for verification details.

Consensus-Critical BIPs

Script Opcodes:

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

Time Validation:

  • BIP113: Median time-past for CLTV timestamp validation (blvm-consensus/src/block.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)
  • 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 (deprecated, legacy compatibility only, blvm-node/src/bip70.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.