Does the entire blockchain have to be recomputed to validate a transaction?
Does the entire blockchain have to be recomputed to validate a transaction? Are transactions validated by recomputing the entire blockchain? If not, how else can it be confirmed that a bitcoin I'm attempting to transact is one that I actually had come into acquisition of previously and still have? If yes on the other hand, how long does that recomputation typically take in practice, and does that pose a scalability risk in the potential for Bitcoin usage (and hence the length of the blockchain) to outpace Moore's law? http://ift.tt/2Brte5N