>
>
>
> You'd still need  BIP 360 P2MR (or P2TRD) since OP_TXHASH needs tapscript,
> and the only available tapscript supporting output type, P2TR, isn't
> quantum safe.
>

false, covenant based multistep secret-reveal spending paths don't rely on
signatures at all


>
> I'm going to assume:
> - you mean to use this commit-reveal for migrating between signature
> algorithms, not for everyday use,
>

it can be used if "q day" happens.  otherwise ignored.


> - TXHASH is being used because you are waiting for the commitment to be
> confirmed on-chain rather than lifeboat's out-of-band commitment system
>

it's used so you can commit to a spending constraint without committing to
the final "as yet to be determined" quantum-safe destination:
https://delvingbitcoin.org/t/a-quantum-resistance-script-only-using-op-ctv-op-txhash-and-no-new-signatures/2168



> Once you post your commit-txn, but before it confirms, other parties can
> post competing commit-txns that double spend your output. If one of
> malicious transactions confirm, you must now wait for a timelock to expire
> and then try to post your transaction.
>

agreed. they have to spend resources to attack your private key and the
only thing they can do is "grief" using a timing attack with the results,
rather than steal outright.  a massive incentive difference.


> They can block you again. Each time they burn some of you coins in fees.
> Miners get the fees, so they might be incentivized to do this. Thus, we
> must trust miners not to do this. Lifeboat doesn't have this issue since it
> uses out-of-band commitments, but out-of-band commitments have their own
> issues.
>

each time you use the reset-path, they have to re-attack a new key.  very
expensive just to grief a small amount of fees spread across all miners.
 sounds like science-fiction levels of compute.


plus.... TX_HASH is simple and generally useful and there is no guarantee
that q-day will even come

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