[Bitcoin-development] Question regarding transactions with NLOCKTIME > 0

s7r s7r at sky-ip.org
Sun Jun 21 12:32:29 UTC 2015


Hi,

Well, depends on your model and what you want to achieve. That would
depend on each wallet, I couldn't confirm nor deny that this is or isn't
true. You have to check with your wallet how it handles transactions
with nLockTime. Maybe you are the one who generates the nLockTime
transaction,  but that needs to be broadcasted by the payee (your
recipient) when the locktime expires?

One way I would use nLockTime is to have the tx generated, and keep it
somewhere not related to my wallet(s) until the nLockTime expires, then
I can broadcast it to the network by /sendrawtransaction and have it
mined and included into a block.


On 6/21/2015 3:11 PM, Braun Brelin wrote:
> So, basically it sounds as though the wallet generating the transaction
> is what is responsible for holding on to the transaction and then
> only releasing it to the network when the NLOCKTIME value is less than
> or equal to the current time.  Does that sound right?  
> 
> Braun
> 
> 
> On Sun, Jun 21, 2015 at 10:45 AM, s7r <s7r at sky-ip.org
> <mailto:s7r at sky-ip.org>> wrote:
> 
>     Hi
> 
>     I don't think that a transaction with nLockTime>0 will be accepted by
>     nodes / relayed in the Bitcoin network, until its time expires (e.g.
>     nLockTime==now). This means it obviously cannot be stored in a block,
>     before its locktime expires. nLockTime is designed in a way that you,
>     need to keep it offline (not broadcast it to the network because it
>     won't be accepted or relayed by nodes) until the locktime expires, then
>     you can broadcast it and it will be mined and included in a block, like
>     a normal tx.
> 
>     This is exactly why Peter Todd and others are working on
>     CHECKLOCKTIMEVERIFY and RELATIVE CHECKLOCKTIMEVERIFY - this is an
>     enhancement to basic nLockTime which tends to offer to users the
>     guarantee that if you have a transaction with nLockTime, the signer
>     holding the private keys used to sign it cannot sign another one, with
>     nLockTime 0 and broadcast it before the locktime for your tx expires.
> 
>     Cheers!
> 
>     On 6/21/2015 10:10 AM, Braun Brelin wrote:
>     > Hi all,
>     >
>     > When a transaction with N_LOCKTIME>0 is created, does that transaction
>     > get stored in a block on the blockchain or is it stored in the mempool
>     > until the actual time (or block number) exceeds the current value?  If
>     > it is stored on the blockchain, how does that affect the concept of
>     > pruning that is supposed to be going in to version 0.11?  I.e. if I
>     > create a transaction that doesn't take effect for 10 years, and that
>     > transaction is stored in a block, does that block stay on the active
>     > list for that period of time?
>     >
>     > Thanks,
>     >
>     > Braun Brelin
>     >
>     >
>     >
>     >
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