I feel it is breaking a principle that if a transaction is valid it remains valid. There might be dangerous repercussions to breaking that rule. For instance chain of transaction become invalid which might lead to losses.
On Thu 6 Sep, 2018, 6:37 PM Alejandro Ranchal Pedrosa via bitcoin-dev, < bitcoin-dev@lists.linuxfoundation.org> wrote: > Hello everyone, > > We would like to propose a new BIP to extend OP_CSV (and/or OP_CLTV) in > order for these to allow and interpret negative values. This way, > taking the example shown in BIP 112: > > HASH160 <revokehash> EQUAL > IF > <Bob's pubkey> > ELSE > "24h" CHECKSEQUENCEVERIFY DROP > <Alice's pubkey> > ENDIF > CHECKSIG > > that gives ownership only to Bob for the first 24 hours and then to > whichever spends first, we basically propose using the negative bit value: > > HASH160 <revokehash> EQUAL > IF > <Bob's pubkey> > ELSE > "-24h" CHECKSEQUENCEVERIFY DROP > <Alice's pubkey> > ENDIF > CHECKSIG > > meaning that both would have ownership for the first 24 hours, but > after that only Bob would own such coins. Its implementation should > not be too tedious, and in fact it simply implies considering negative > values that are at the moment discarded as for the specification of > BIP-112, leaving the sign bit unused. > > This, we argue, an increase the fairness of the users, and can at times > be more cost-effective for users to do rather than trying a Replace-By-Fee > transaction, should they want to modify such payment. > > We would like to have a discussion about this before proposing the > BIP, for which we are preparing the text. > > You can find our paper discussing it here: > https://hal-cea.archives-ouvertes.fr/cea-01867357 (find attached as well) > > Best, > > -- > Alejandro Ranchal Pedrosa, Önder Gürcan and Sara Tucci-Piergiovanni > > _______________________________________________ > bitcoin-dev mailing list > bitcoin-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev >
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