Slow Fog Cosine: It is possible to maliciously monopolize inscription trading through low transaction fees

ChainCatcher message, regarding the malicious behavior of "buyers initiating ultra-low Gas transactions to purchase inscriptions, making it impossible to complete in the short term, accelerating transactions after a price increase, and canceling transactions after a price drop," the founder of Slow Mist, Yu Xian, stated on social media that due to the PSBT signing mechanism used by trading platforms, it is indeed possible to maliciously occupy this transaction for a certain period of time.

RBF can be used to accelerate the success of the transaction, but it will not accelerate the cancellation of the transaction (the cancellation is actually the low Fee transaction before the successful one, but theoretically, there will eventually be a successful transaction according to the seller's PSBT agreement).

Yu Xian mentioned that this sell order can occupy for a long time (for example, several days), but to keep occupying, Mempool does not allow it, though he is not clear on the exact duration. Therefore, platforms definitely need to have a timeout mechanism to avoid the situation where the seller's PSBT signature is occupied for a long time; once the timeout occurs, other buyers should be allowed to take the seller's PSBT signature.