* [bitcoindev] TRUC and P2A for CTV fee management
@ 2024-12-18 0:25 'stutxo' via Bitcoin Development Mailing List
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From: 'stutxo' via Bitcoin Development Mailing List @ 2024-12-18 0:25 UTC (permalink / raw)
To: Bitcoin Development Mailing List
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Hi everyone,
I am trying to learn more about op_ctv (or its true name, op_securethebag).
One thing I keep hearing is that estimating fees are potentially an issue
when spending CTV transactions.
jamesob mentioned fees in his simple_ctv_valut
<https://github.com/jamesob/simple-ctv-vault>
*Because coins may remain vaulted for long periods of time, the unvault
process is sensitive to changes in the fee market. Because use of OP_CTV
requires precommiting to a tree of all possible specific outputs and the
number of inputs, we cannot use RBF to dynamically adjust feerate of
unvaulting transactions.*
and rustyrussell on nostr also mentioned fees being a problem
<https://primal.net/e/note1ulw6tr8hrqz092wy02fcyshn3fgt309kc5w95mhl7j0shj7c9zxsu8a2mw>
*Optimised sponsors for solving the "but how do I add fees" problem in a
way that doesn't drive miner centralisation.*
With v3 transactions available in bitcoin 28.0
<https://bitcoinops.org/en/bitcoin-core-28-wallet-integration-guide/>there
are a bunch of new techniques that have been enabled that we can use to
hopefully solve these issues
As long as you have an output for 240 sats paying to a P2A address, such as
tb1pfees9rn5nz on signet, you or anyone else will be able to bump the fees
using CPFP on the anchor output.
I have some examples of these transactions here on signet
CTV spend transaction with zero fees:
https://mempool.space/signet/tx/32f4f4e6165e7f8df9b9a762e11a6ca7f16087713e0e3e42352021e6bf3800e3
P2A CPFP transaction:
https://mempool.space/signet/tx/9a3582f03b0ac39cff8ed024cf8f38e4fc4a1ee2ff216badf041bf4572c0d03b
Code used is here:
https://github.com/stutxo/simple_ctv
Is there anything I am missing here? What are the downsides of this method?
Is this how most ctv scripts spends would work?
Thanks!
stu
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