Bitcoin Dev Archive Topics

Timelocks

nLockTime was in the first release; CHECKLOCKTIMEVERIFY (BIP 65) and the relative locks of BIPs 68, 112 and 113 came out of these threads in 2014 and 2015. They are what make payment channels and vaults possible.

85 threads and 848 messages, 16 Apr 2013 to 21 Aug 2026.

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BIPs

Bitcoin Optech

The threads, in order

Listed by the date of each thread's first message.

2013 3 threads

16 Apr 2013
Anti DoS for tx replacement Mike Hearn
26 messages
21 Jun 2013
CTxIn::nSequence Marko Otbalkana
3 messages
20 Dec 2013
Censorship-resistance via timelock crypto for embedded consensus systems Peter Todd
1 message

2014 8 threads

26 Apr 2014
Eliminating double-spends with two-party self-escrow for high value transactions Peter Todd
5 messages
4 Jun 2014
Timelock: time-release encryption incentivised by Bitcoins Peter Todd
1 message
6 Jun 2014
Wallet nLockTime best practices Jeff Garzik
2 messages
25 Jun 2014
Wallet nLockTime best practices Jeff Garzik
1 message
1 Aug 2014
deterministic transaction expiration Kaz Wesley
34 messages
1 Oct 2014
CHECKLOCKTIMEVERIFY - Prevent a txout from being spent until an expiration time Peter Todd
46 messages
27 Nov 2014
BIP 65 and OP_CHECKLOCKTIMEVERIFY inquiry... Richard Moore
5 messages
15 Dec 2014
Recent EvalScript() changes mean CHECKLOCKTIMEVERIFY can't be merged Peter Todd
12 messages

2015 29 threads

9 Jan 2015
Bi-directional micropayment channels with CHECKLOCKTIMEVERIFY Nathan Cook
9 messages
1 Feb 2015
var_int ambiguous serialization consequences Tamas Blummer
4 messages
4 May 2015
CLTV opcode allocation; long-term plans? Peter Todd
11 messages
7 May 2015
Assurance contracts to fund the network with OP_CHECKLOCKTIMEVERIFY Tier Nolan
9 messages
11 May 2015
Reducing the block rate instead of increasing the maximum block size Sergio Lerner
10 messages
27 May 2015
Consensus-enforced transaction replacement via sequence numbers Mark F
22 messages
2 Jun 2015
Consensus-enforced transaction replacement signalled via sequence numbers Mark F
11 messages
21 Jun 2015
Question regarding transactions with NLOCKTIME > 0 Braun Brelin
5 messages
25 Jun 2015
BIP65 / CHECKLOCKTIMEVERIFY deployment Peter Todd
5 messages
2 Jul 2015
BIP 68 Questions Rusty Russell
2 messages
5 Jul 2015
BIP 68 (Relative Locktime) bug Tom Harding
7 messages
12 Jul 2015
Bitcoin Core 0.11.0 released Wladimir J. van der Laan
4 messages
13 Aug 2015
CHECKSEQUENCEVERIFY - An opcode for relative locktime Btc Drak
34 messages
13 Aug 2015
CHECKSEQUENCEVERIFY - An opcode for relative locktime (Btc Drak) Nicolas Dorier
2 messages
18 Aug 2015
BIP: Using Median time-past as endpoint for locktime calculations Thomas Kerin
6 messages
19 Aug 2015
CLTV/CSV/etc. deployment considerations due to XT/Not-BitcoinXT miners Peter Todd
19 messages
23 Aug 2015
Encouraging mining of the first few big blocks with OP_CSV and BIP68 Johnson Lau
2 messages
17 Sep 2015
Fill-or-kill transaction Johnson Lau
14 messages
27 Sep 2015
Let's deploy BIP65 CHECKLOCKTIMEVERIFY! Peter Todd
101 messages
29 Sep 2015
Are 'soft forks' misnamed? [was: Let's deploy BIP65 CHECKLOCKTIMEVERIFY!] Greg Maxwell
1 message
1 Oct 2015
Pedantic note on the use of "eventual consistency" to describe Bitcoin [Was: Let's deploy BIP65 CHECKLOCKTIMEVERIFY!] Greg Maxwell
1 message
3 Oct 2015
CHECKSEQUENCEVERIFY - We need more usecases to motivate the change Peter Todd
21 messages
7 Oct 2015
extension-blocks/sidechains & fractional/coin-cap/demurrage (Re: Let's deploy BIP65 CHECKLOCKTIMEVERIFY!) Adam Back
2 messages
7 Oct 2015
soft-fork security (Re: Let's deploy BIP65 CHECKLOCKTIMEVERIFY!) Adam Back
1 message
13 Nov 2015
Contradiction in BIP65 text? xor
6 messages
17 Nov 2015
Opt-in Full Replace-By-Fee (Full-RBF) Peter Todd
3 messages
21 Nov 2015
BIP68: Relative lock-time through consensus-enforced sequence numbers (update) Btc Drak
1 message
24 Nov 2015
BIP68: Second-level granularity doesn't make sense Peter Todd
3 messages
24 Nov 2015
Alternative name for CHECKSEQUENCEVERIFY (BIP112) Btc Drak
14 messages

2016 4 threads

22 Jan 2016
nSequence multiple uses Andrew C
3 messages
18 Mar 2016
New Soft Fork Deployment: CSV (BIP's 68, 112, 113) Alex Morcos
1 message
3 Aug 2016
BIP clearing house addresses Matthew Roberts
16 messages
21 Sep 2016
Requesting BIP assignment; Flexible Transactions. Tadge Dryja
8 messages

2017 5 threads

12 Jan 2017
Transaction Replacement by Fee Amir Taaki
4 messages
11 Apr 2017
Proposed CSV configuration file format for bip-genvbvoting Sancho Panza
1 message
15 May 2017
Rolling UTXO set hashes Pieter Wuille
10 messages
8 Jul 2017
Standard address format for timelocked funds ZmnSCPxj
3 messages
5 Nov 2017
Generalised Replay Protection for Future Hard Forks Mats Jerratsch
12 messages

2018 1 thread

20 Feb 2018
Multi CSV Transaction Praveen Baratam
3 messages

2019 4 threads

13 Mar 2019
More thoughts on NOINPUT safety Anthony Towns
19 messages
16 Aug 2019
Burying CSV and segwit soft fork activations John Newbery
3 messages
6 Sep 2019
Reconciling the off-chain and on-chain models with eltoo Christian Decker
7 messages
19 Sep 2019
Timelocks and Lightning on MimbleWimble ZmnSCPxj
8 messages

2020 4 threads

31 Jan 2020
Onchain fee insurance mechanism ZmnSCPxj
3 messages
21 Feb 2020
LN & Coinjoin, a Great Tx Format Wedding Antoine Riard
8 messages
25 Mar 2020
Statechain implementations Tom Trevethan
25 messages
11 Aug 2020
Detailed protocol design for routed multi-transaction CoinSwap Chris Belcher
24 messages

2021 4 threads

10 Jun 2021
BIP proposal: Anti-fee-sniping protection with nSequence in taproot transactions to improve privacy for off-chain protocols Chris Belcher
4 messages
8 Jul 2021
Eltoo / Anyprevout & Baked in Sequences Jeremy Rubin
6 messages
4 Sep 2021
Note on Sequence Lock Upgrades Defect Jeremy Rubin
7 messages
13 Oct 2021
Year 2038 problem and year 2106 chain halting vjudeu
15 messages

2022 6 threads

3 Mar 2022
Recurring bitcoin/LN payments using DLCs Chris Stewart
8 messages
4 Mar 2022
Annex Purpose Discussion: OP_ANNEX, Turing Completeness, and other considerations Jeremy Rubin
9 messages
10 May 2022
OP_TX: generalized covenants reduced to OP_CHECKTEMPLATEVERIFY Rusty Russell
5 messages
4 Sep 2022
Multipayment Channels - A scalability solution for Layer 1 Ali Sherief
2 messages
12 Oct 2022
Wallet Fingerprinting with nLocktime and nVersion alicexbt
1 message
7 Nov 2022
Removing BIP-125 Rule #5 Pinning with the Always-Replaceable Invariant Peter Todd
7 messages

2023 3 threads

13 Feb 2023
BIP for OP_VAULT James O'Beirne
23 messages
20 Oct 2023
Examining ScriptPubkeys in Bitcoin Script Rusty Russell
8 messages
14 Dec 2023
Scaling Lightning Safely With Feerate-Dependent Timelocks jlspc
13 messages

2024 5 threads

24 Jan 2024
CheckTemplateVerify Does Not Scale Due to UTXO's Required For Fee Payment Peter Todd
14 messages
13 Mar 2024
OP_Expire mempool behavior Peter Todd
4 messages
19 Aug 2024
BIP 8.5: Flag day activation based on nlocktime signaling /dev /fd0
7 messages
24 Sep 2024
Shielded CSV: Private and Efficient Client-Side Validation Jonas Nick
4 messages
28 Dec 2024
Mandatory Inclusion of Old Transactions in Blocks developer
7 messages

2025 6 threads

5 Feb 2025
Update on the Great Consensus Cleanup Revival Antoine Poinsot
15 messages
27 Apr 2025
The Tragic Tale of BIP30 Ruben Somsen
13 messages
27 Sep 2025
A Bitcoin Scripting Proposal BIP Quartet Rusty Russell
10 messages
11 Dec 2025
Feedback on a simple 2-path vault design (2-of-2 + CLTV recovery) and use of pruned nodes for UTXO retrieval victor perez
5 messages
28 Dec 2025
BIP idea: Timelock-Recovery storage format Oren
6 messages
30 Dec 2025
Addressing remaining points on BIP 54 Antoine Poinsot
15 messages

2026 3 threads

20 May 2026
One Time Signatures as an Advantage? Jason Resch
7 messages
11 Jun 2026
Removal of BIP 125 RBF signalling in wallet transactions rkrux
6 messages
18 Aug 2026
Anti-Fee-Sniping with LockTime nervana21
3 messages