Eight Recent BIPs
Eight recent BIPs in bitcoin/bips covering soft-fork drafts, new opcodes, post-quantum migration, and dust disposal.
8
RECENT BIPS
5
SOFT-FORK DRAFTS
3
NEW OPCODES
THE SHAPE OF THE MONTH
Three thematic clusters: a "Great Script Restoration" pair from Rusty Russell + Julian Moik (BIPs 440 / 441), a tapscript-opcodes family aimed at second-layer protocols (BIPs 442 / 446 / 448), and a set of operational BIPs covering quantum migration (361), Silent-Payment PSBTs (376), and dust UTXO disposal (451).
FOOTPRINT
Five of eight are consensus / soft-fork drafts. Two restore script ops emergency-disabled in 2010. One sunsets legacy ECDSA / Schnorr signatures.
Soft-Fork Drafts & New Opcodes
Great Script Restoration — Rusty Russell & Julian Moik
WHAT IT IS
Satoshi disabled a batch of script opcodes (string-handling, multiplication/division, bitwise) in 2010 after a serious bug. They've been dead since. The Great Script Restoration is a two-BIP plan to bring them back behind a runtime "fuel budget" (BIP-440) so no script can run away with the network. Lightning, Ark, vaults, and BitVM would get a richer toolkit.
440
Varops Budget for Script Runtime Constraint
A "fuel budget" for any future script work — every opcode counts against a per-transaction limit, so nothing can use too much CPU. Required scaffolding for BIP-441.
441
Restoration of disabled Script (Tapleaf 0xc2)
Brings back the 2010-disabled opcodes, including
OP_CAT, OP_SUBSTR, OP_MUL/DIV/MOD, shifts, and bitwise ops. Lives on a new tapleaf version (0xc2) so old scripts are unaffected. Safe under BIP-440's budget. Requires BIP-440.New Tapscript Opcodes
442
OP_PAIRCOMMIT
Pop two stack elements, push the tagged-hash commitment. Limited vector commitment for richer contracts; LNhance candidate. Replaces
OP_SUCCESS205 on tapleaf 0xc0. Authors: moonsettler, Brandon Black.446
OP_TEMPLATEHASH
Modern CTV-style commitment to the spending transaction — a UTXO can lock its spend to a specific future tx shape, so participants don't have to pre-sign every possible spending path up front. Removes pre-signed-tx interactivity in Lightning HTLCs, makes Ark VTXOs non-interactive, optimises DLCs. Authors: Sanders, Poinsot, Roose.
448
Taproot-native (Re)bindable Transactions
Bundles BIP-446
OP_TEMPLATEHASH + BIP-348 OP_CHECKSIGFROMSTACK + BIP-349 OP_INTERNALKEY into one deployment unit. Aimed at LN-Symmetry, Ark, and other second-layer protocols.Quantum, Privacy & UTXO Hygiene
Post-Quantum Migration
361
Post Quantum Migration and Legacy Signature Sunset
Lopp et al's calendar-based PQ migration: Phase A bans sends to legacy types; Phase B restricts ECDSA / Schnorr spends by requiring a quantum-safe rescue path, with exact rescue mechanics still TBD. Covered in depth alongside the other five quantum proposals on this month's Quantum Update page — see the migration-proposals slide.
→ quantum page
Silent Payments Tooling
376
Spending Silent Payment outputs with PSBTs
New per-input PSBTv2 fields for the BIP-352 silent-payment tweak. Lets multi-party / hardware-signing workflows handle SP output spends. Requires BIPs 352, 370, 371. Author: nymius.
UTXO Hygiene
451
Dust UTXO Disposal Protocol
Standardised way to spend dust UTXOs to
OP_RETURN with the entire value going to fees. Dust outputs are uneconomic to spend normally (fees exceed value) yet bloat every full node's UTXO set forever; sending to a provably-unspendable OP_RETURN lets the chain recognise destruction without growing the set. Mitigates the privacy-vs-UTXO-bloat tradeoff, with caveats around public-key exposure and same-address non-dust funds. Includes signature conventions for third-party batching. Landed May 6.MERGED THIS WEEK
BIP-451 landed on May 6. The dust-attack threat model traces back to the start of 2026's data-carrier debate. BIP-451 gives victims a disposal path; BIP-110 limits what can be put on-chain in the first place.
Soft-Fork Pipeline
DRAFT CONSENSUS BIPs MOVED THIS YEAR
• BIP-54 — consensus cleanup
• BIP-110 — data-spam limit
• BIP-119 — CTV
• BIP-348 — CSFS
• BIP-349 — OP_INTERNALKEY
• BIP-440/441 — varops + 0xc2 restore
• BIP-442 — PAIRCOMMIT
• BIP-446/448 — TEMPLATEHASH bundle
• BIP-361 — PQ sunset
• BIP-110 — data-spam limit
• BIP-119 — CTV
• BIP-348 — CSFS
• BIP-349 — OP_INTERNALKEY
• BIP-440/441 — varops + 0xc2 restore
• BIP-442 — PAIRCOMMIT
• BIP-446/448 — TEMPLATEHASH bundle
• BIP-361 — PQ sunset