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@BarneyChambers BarneyChambers released this 23 Feb 22:16
· 18 commits to master since this release
v0.3.0-testnet
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Consensus: BIP360 P2MR (Pay-to-Merkle-Root) Output Type

Implement SegWit version 2 P2MR outputs as specified in BIP360. P2MR provides a quantum-resistant script tree output type by removing the Taproot key path spend, which exposes a public key vulnerable to quantum key recovery via Shor's algorithm.

P2MR commits directly to the script tree Merkle root (no internal key, no tweak), enabling Dilithium post-quantum signature opcodes to provide real protection inside the script tree.

Consensus changes

  • Add SigVersion::P2MR_TAPSCRIPT and SCRIPT_VERIFY_P2MR flag
  • Add VerifyP2MRCommitment (Merkle root verification without tweak)
  • Add witversion==2 branch in VerifyWitnessProgram
  • No key path (reject witness stack with fewer than 2 elements)
  • Control block format 1+32*m bytes (no internal key)
  • Parity bit enforcement (must be 1 per BIP360)
  • Validation weight for Dilithium signature checks
  • Route P2MR_TAPSCRIPT through EvalChecksigTapscript, SignatureHashSchnorr, CheckSchnorrSignature, and ExecuteWitnessScript
  • Re-enable Dilithium opcodes in P2MR tapscript context (blocked in P2TR)
  • Block OP_CHECKMULTISIG in P2MR (inherited from BIP342 tapscript rules)

Address and type system

  • Add WitnessV2P2MR destination type and TxoutType::WITNESS_V2_P2MR
  • Add bc1z address encoding/decoding (SegWit v2, bech32m)
  • Add P2MRBuilder for constructing P2MR outputs from script trees
  • Add P2MRSpendData for script path spending

Policy and activation

  • Add P2MR witness standardness checks
  • Activate SCRIPT_VERIFY_P2MR on all networks

Tests

  • Add feature_p2mr.py with coverage for output format, script-path spend/mine flow, no-key-path enforcement, all 5 Dilithium opcodes (P2MR vs P2TR), error paths, OP_CHECKMULTISIG blocking, multi-leaf trees, invalid proofs, control block size/parity validation, address encoding, and multi-input transactions
  • Add p2mr_construct() and P2MRInfo in Python test framework

Additional Changes

1) Block time + retarget cadence updates

  • Reduced target block spacing from 10 minutes to 1 minute across BTQ networks.
  • Updated activation window math to match 1-minute blocks:
    • nMinerConfirmationWindow: 20160 (14 days at 1-minute spacing)
    • nRuleChangeActivationThreshold: 18144 (90%) / 15120 (75% testnet)
  • Fixed a hardcoded 10-minute assumption in Qt prune UI estimation (intro.cpp) so backup-day estimates align with BTQ’s 1-minute chain.

2) Reward and emission schedule corrections

  • Updated block subsidy from 50 BTQ to 5 BTQ (GetBlockSubsidy).
  • Updated halving interval from 210,000 to 2,100,000 blocks for main/test/signet (and corresponding regtest scaling), keeping a Bitcoin-like ~4-year halving cadence under 1-minute blocks.
  • Net effect: maintains long-term emission target alignment while supporting higher block frequency.

3) Weight, block policy, and sigop/security fixes

  • Restored witness discount behavior with BTQ parameters:
    • WITNESS_SCALE_FACTOR = 16
    • MAX_BLOCK_WEIGHT = 8,000,000
    • default miner soft cap DEFAULT_BLOCK_MAX_WEIGHT = 7,600,000
  • Fixed transaction input weight accounting to include serialized witness stack size in GetTransactionInputWeight().
  • Added Dilithium tapscript/sigop hardening (security: fix Dilithium sigop counting and tapscript vulnerabilities), including interpreter and script error path updates plus functional tests.

4) Genesis remine and chain parameter refresh

  • Re-mined genesis parameters (timestamp text, nonce/hash assertions, merkle roots, and chainTxData timestamps) for BTQ networks during Feb 2026 updates.
  • Current mainnet genesis assertions are updated to:
    • hashGenesisBlock = 0x0000ca45ea08433961609b50cd0c3f76d14589f8f61973ebbc344c3a160f7cdd
    • hashMerkleRoot = 0xec88310bd306cf5f9554cc257db16b81147e4bd0efda75f11b38467a5d918db1

5) Peer node and seed endpoint updates

  • Mainnet seed list normalized back to DNS seed form:
    • seed1.btq.com
  • Testnet seed endpoints updated/renamed to:
    • testnet-seed1.bitcoinquantum.com
    • testnet-seed2.bitcoinquantum.com
  • Intermediate temporary raw-IP seed entry was introduced then removed in later commits; latest master reflects DNS seed-based configuration.

6) Wallet/Dilithium performance and reliability improvements

  • Removed extensive debug logging in Dilithium key generation/RPC/wallet load paths.
  • Added IsMine result caching in wallet logic (m_ismine_cache) with invalidation on keypool/SPKM updates to reduce repeated ownership checks and improve wallet load/runtime responsiveness.
  • Build/linkage cleanup for Dilithium key classes:
    • moved CDilithiumPubKey implementation into a dedicated dilithium_pubkey.cpp
    • adjusted Makefile source groupings
  • Fixed test build wiring for Dilithium RPC tests under wallet-enabled builds.

7) Test coverage alignment

  • Updated functional, unit, and fuzz tests to reflect the 5 BTQ subsidy and revised chain economics.
  • Extended script/consensus test coverage for Dilithium + P2MR policy and validation behavior.
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