Questions tagged [locktime]
Defines the block number or timestamp until this transaction is locked, or 0 if the transaction is always locked.
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What are the correct "threshold" values of the nSequence in order to activate relative time lock and only absolute time lock?
Based on BIP68, relative lock time is activated if the most significant bit in nSequence value is not set. In other words, if the 32th (1<<31) bit is not set. So for the nSequence values less-...
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What was the first original purpose of the nLocktime? Was it only the time bound to nSequence?
Pieter Wuille gave an amazing answer related to the connection between nSequence and nLocktime in the early days of Bitcoin.
However, based on his answer it looks like the nLocktime was NOT really ...
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What is the logic (if there is) behind linking the nSequence and nLockTime?
The nSequence transaction field was originally intended for a replacement logic, but since it was never well thought out, it was never implemented. However, it has been implemented since the beginning ...
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What is the relation between nLockTime and nSequence?
Here Antoine said the following:
This introduced absolute timelock capability through the nLockTime transaction field, which is disabled if all the transactions inputs have an nSequence that is ...
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What are all the meanings of the nSequence field?
I know the original purpose of the nSequence field was to hold the transaction in the mempool with the transaction being replaced when the larger value comes and so on up to 0xFFFFFFFF when the ...
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How does CLTV prevent spender from spending the output? [duplicate]
I have difficulty understanding how does CheckLockTimeVerify works. The BIP-65 which proposed CTLV says:
This BIP describes a new opcode (OP_CHECKLOCKTIMEVERIFY) for the
Bitcoin scripting system that ...
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Is there locktime but in the other way around? (valid until block x) [duplicate]
Locktime defines the earliest block number that the transaction can be added to the blockchain. Is there any way to define the latest block number that a transaction can be mined? For example, ...
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What will happen if I try to broadcast a transaction before the established locktime block height passed?
If someone send me BTC with locktime and I accidentally try to broadcast transaction before the established block height passed, what will happen?
Am I still be able to broadcast it after the ...
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Why is the locktime set at transaction level while the sequence is set at input level?
Giacomo Zucco pointed out the oddity of there being one timelock field per transaction, but one sequence per input.
Even for the original use of determining the order of replacement, it would seem ...
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Can a signed raw transaction's locktime be changed?
If I create a signed raw transaction with a locktime in the future, and give this raw transaction to somebody else, can they edit the locktime so that they recieve the bitcoin immediately?
For example,...
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Unable to use UNIX timestamp for locktime on testnet
I am trying to create a timelock transaction, but I am unable to use a UNIX timestamp on testnet. However, if I use a block height the transaction works.
When I use a block height that is in the ...
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Should an offline address generated from private key send funds to wallet?
I'm trying to use the python package python-bitcoinlib to send a timelock transaction on testnet. The github has two examples to create an address, and then use that address to send the bitcoin to ...
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Why would a transaction have a locktime of 1987!
I don't understand the locktime in transaction 97DC62BAB016D8EE5C828C76318FE01E9A70992F150838960122DFA9BF8089BC
Hexadecimal Data
Meaning
82BF3B20
LockTime 1987-02-20 02:29
The locktime is ...
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How to create a valid time locked descriptor?
I am attempting to bitcoin-cli getdescriptorinfo "wpkh([00000000/84h/1h/0h/2]tpubDECM3jqdpSiGU2mKmo6xXxxXwFcmz6fX9EHMV3zbTY236jYYK9tM57cRFWaHqNjLbqAy52P6wkyo9wCAnr4P7Q1hGGFnrW98LPLajXEZPez/35:...
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nLocktime for Bitcoin Core
I was reading this while doing some research: https://github.com/achow101/wallet-fingerprinting/blob/main/fingerprints.md and had some questions:
What is the default nLocktime for a transaction in ...
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Time delayed transactions as a solution for the inheritance problem?
Is it possible to construct a transaction which is delayed in time, more specifically blocks?
The idea being that you have a device which has a signed transaction, which sends all of your Bitcoin to ...
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Question about Bitcoin's Median Time Past
I was currently reading the book Mastering Bitcoin written by Andreas and was pretty confused about the concept called Median Time Past. Hopefully I can get some of your advice.
From my understanding, ...
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Are attempts to spend from a timelocked UTXO rejected?
Background
I was reading a bit about Bitcoin time locked transactions within the context of the Lightning Network. One thing that was never explained is what happens when one tries to prematurely ...
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Coinbase transaction UTXOs are prohibited until 100 confirmed? By what?
I notice that many coinbase transactions(like in block 720,815) with locktime=0x00000000 and sequence=0xFFFFFFFF, which means UTXO could be spent immediately.
There seems to be no limit to coinbase's ...
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UNIX END TIME January 19, 2038 - Will it affect Timelock nLOCKTIME smart contracts past that date?
So UNIX END TIME is January 19, 2038.
What will happen then to the btc TX that looks at Unixtime for nLOCKTIME transactions?
Will any Locktime transaction past that date, say to 2040 be an issue? Or ...
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Why are miners setting the locktime in coinbase transactions?
Some coinbase transactions have locktime values set. One such recent example is:
{
"txid": "5166cb509a5d786db33963a269ea08ff82a1c40d37d4fb828a394b0465cd5efd",
"hash": ...
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P2TR Scriptpath failing (Timelocked contract)
Goal is to archive the following logic:
$alice = A;
$bob = B;
pk($bob) || (pk($alice) && older(10))
I went through The Taproot Workshop and came up with the following code:
from io import ...
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Why are OP_RETURN transactions discouraged? Does using version or locktime make any difference?
Why are OP_RETURN transactions discouraged? Are they paying less fees compared to other transactions?
Will it make any difference if same thing is done using version or locktime when data is either 1 ...
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Is it possible to change `their_to_self_delay` after a channel is open?
Rene said here that a c-lightning node is safe for around 24 hours to be offline (depending on the locktime). This is set with watchtime-blocks in the configuration file of c-ligthning. But this will ...
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Best way to store fund on the lightning network
Suppose that someone want to store 0.1 bitcoin on the lightning network for a period of 1 year to use services such as buying and selling things but doesnt know which one and with who yet.
What would ...
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what if the timelock is in the past?
I just started learning about bitcoin scripting and wonder:
what if the timelock in CLTV is in the past?
what if the timelock in nLocktime is equal to 500.000?
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Should the nodes of a channel have the same Time Lock Delta?
Consider this channel https://1ml.com/channel/612829298476056576 :
Node 1: Caffeine
Time Lock Delta: 10
Node 2: HODLcat.com
Time Lock Delta: 144
How is an HTLC passing through this ...
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non-mandatory-script-verify-flag (Locktime requirement not satisfied) (code 64)
I'm attempting to redeem the following htlc ( the python script below ) via timeout, however the redemption tx errors out upon validation with the error below:
bitcoin.rpc.VerifyRejectedError: {'code'...
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At what block height may locktimed transactions get included?
Transactions with outputs whose sequence is smaller than UINT_MAX are interpreted as locked until the timestamp or block height specified in nLockTime is reached.
Specifically regarding the block ...
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Are both CSV and nLocktime unnecessary in Eltoo?
The Eltoo paper says "Notice that we could use nSequence for this purpose, but due to the interplay with OP_CSV we opted to use nLocktime". Now that Lau showed CSV not to be necessary, does that mean ...
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In Lightning commitment transactions, what do the upper 8 bits of sequence and locktime represent?
In Bolt 3 of the Lightning Network specs, for commitment transactions it states:
locktime: upper 8 bits are 0x20, lower 24 bits are the lower 24 bits of the obscured commitment number.
sequence: ...
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What does the 'n' in nLockTime and nSequence stand for?
I know what nLockTime and nSequence do, but I'm just curious about where the 'n' comes from. Thanks
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nLockTime in Bitcoin Core
Currently, the Bitcoin Wiki states:
A part of the original Bitcoin implementation, nLockTime is a field that specifies the earliest time a transaction may be added to a valid block. A later Bitcoin ...
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Strange LockTime values in Electrum transactions?
Electrum includes a locktime in all transactions by default.
Usually the value is equal to the current block height, eg 592918, however it sometimes drops perhaps 20 or so blocks.
What is going on ...
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How to make a transaction with locktime on testnet?
I tried to make transaction with nLocktime on bitcoin testnet. I am not able to broadcast it.
Can someone please help me to make a basic transaction with 1 input and 1 output, so that I can broadcast ...
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What is transaction "finality"?
bitcoind IsFinalTx() as seen here checks the properties of a transaction in this order:
Is nLockTime exactly 0? That's final. return.
If it's not 0, is it below the current block height / time? If so,...
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How can I make transaction output time locked?
Is it possible to submit some coins to some address and make them spendable after some period of time?
Like I want submit 1btc to address 1Kc24m... and make that output to be spendable after january ...
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The nlocktime parameter in createrawtransaction seems not work using Bitcoin Core Wallet GUI
If I add the CLocktime (e.g 20) at the end it always gives:
Error: Error parsing JSON:{"12CxqQHzhFxCm2TkGkKHdFFPyUerFXcSte":0.008,"1DBDDvpcHv66LD7sWz1mCitPALW1qfrga7":0.012},
If I delete the ...
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Where is a tx located before finalized with the sequence number or locktime?
My understand, for a tx, before it finalized with the locktime, it can not go into mempool. But, which specified location is the tx to stay for waiting the locktime come. Similiar, for before the ...
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How does one lock their own Bitcoins for X amount of blocks and prove that you locked it?
Is there a method of locking Bitcoins for X amount of blocks and also being able to prove its locked? How would one do this and with what wallet? Mobile wallet possible?
Reason why is I'd imagine one ...
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Create a transaction spendable in a specific block height
I am new in Bitcoin and I try to create an address in Bitcoind and send a transaction that the amount will be spendable in a specific height of the blockchain.
Here is what I have done:
privateKey = ...
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Why CHECKLOCKTIMEVERIFY and CHECKSEQUENCEVERIFY opcodes have to be succeeded with DROP Opcode?
Opcodes that end in VERIFY generally do not leave anything on the stack. What's so different and the reasoning when designing these opcodes that CHECKLOCKTIMEVERIFY and CHECKSEQUENCEVERIFY opcodes ...
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How to spend a multisignature, CLTV time-locked UTXO?
I am using this locking script with libbitcoin explorer to create a bitcoin testnet transaction:
bx script-to-address -v 196 "[efa716] checklocktimeverify drop 2 [...
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Reference an UTXO of a transaction that has not been yet mined
How to reference an UTXO that has not been yet mined? I want to prepare a transaction and, before spreading it, use its UTXO as input for another relative timelocked transaction. Then, spread the ...
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How does nSequence/Check Sequence Verify work?
How does relative timelock work? I mean, I know the theoretical description, but how to use nSequence concretely ? Can you do me a practical example with 2 sample transactions one of which locked with ...
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Is the bit encoding format for the graphic in BIP 68 implicitly little-endian?
CLTV (OP_CHECKLOCKTIMEVERIFY - absolute locktime) and CSV (OP_CHECKSEQUENCEVERIFY - relative locktime) utilize BIP 68. Is the locktime for those two operations implicitly encoded in little-endian ...
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Is it posible to create a transaction output that can either be reddemed by privK of Addr A or by privK of Addr B AFTER certain blockheight?
I am thinking about how to secure your Bitcoin savings.
One idea I had was to create sort of a "backup" address B for an address A which stores the bitcoins. So what I want to achieve is that you ...
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BIP 113 - monotonic guarantee
BIP 113 mentions:
Existing consensus rules guarantee this value to monotonically advance, thereby removing the capability for miners to claim more transaction fees by lying about the timestamps of ...
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CHECKSEQUENCEVERIFY After x time of last transaction
Is there a way where i can have a multi-sig address which will allow one of the signers to use only their single key after a set amount of time after each transaction/update on the address?
I want ...
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Locktime requirement not satisfied when locktime set to 1 in p2sh
I've created the following script on testnet:
OP_IF
2 <pubkey1> <pubkey2> <pubkey3> 3
OP_CHECKMULTISIG
OP_ELSE
1 OP_CHECKSEQUENCEVERIFY
OP_DROP
<pubkey1&...
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