The time when the last satoshi is mined is irrelevant. The security will be in question as soon as the block subsidy drops below the level of tx fees, which wil

The time when the last satoshi is mined is irrelevant. The security will be in question as soon as the block subsidy drops below the level of tx fees, which will only take a few decades. In the past decade, no progress has been made on the size of numbers that can be factored by a quantum computer. From https://en.wikipedia.org/wiki/Shor%27s_algorithm https://en.wikipedia.org/wiki/Shor%27s_algorithm: > Also, in 2012, the factorization of 21 was achieved, setting the record for the largest integer factored with Shor's algorithm. In 2019 an attempt was made to factor the number 35 using Shor's algorithm on an IBM Q System One, but the algorithm failed because of accumulating errors.