There are services that allow users to pay a higher fee to prioritize their transactions, ensuring they get confirmed faster by miners. This could also be misconstrued as a "flash" transaction due to the expedited processing.
In the authentic Bitcoin network, a transaction cannot simply "vanish" if it follows valid consensus rules and is embedded into a block by miners. What scammers call a "flash transaction" is usually one of two things: flash btc transaction core network 63 0 best download
The phrase is a combination of technical jargon used by bad actors to target specific search queries. There are services that allow users to pay