On 2022-11-07 11:17, Peter Todd via bitcoin-dev wrote:
We can ensure with high probability that the transaction can be
cancelled/mined
at some point after N blocks by pre-signing a transaction, with
nLockTime set
sufficiently far into the future, spending one or more inputs of the
transaction with a sufficiently high fee that it would replace
transaction(s)
attempting to exploit Rule #3 pinning (note how the package limits in
Bitcoin
Core help here).
This implies a floor on the funds involved in a contract. For example,
if the pinning transaction is 100,000 vbytes at a feerate of 1 sat/vb,
the minimum contract amount must be a bit over 100,000 sats (about $17
USD at current prices). However, participants in a contract not meant
to settle immediately probably need to assume the worst case future
pinning, for example where transactions paying even 100 sat/vb won't be
mined promptly; in which case the minimum contract amount becomes
something like $1,700 USD.
That seems sub-optimal to me.
-Dave
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