>current blockchains will need to adopt post-quantum crypto methods of signing transactions, and migrate existing balances. That's sort of true. Bitcoin is mos

>current blockchains will need to adopt post-quantum crypto methods of signing transactions, and migrate existing balances. That's sort of true. Bitcoin is mostly quantum safe. The only vulnerability is that a quantum computer could deduce a private key and change a transaction during the brief (~1 hour) window when the transaction is pending. Quantum computers would have get to ~660*10^6 quantum gates per second before this becomes feasible (roughly a clock cycle of 660 MHz in classical terms). The first quantum computers will likely be slower than this. The bitcoin ledger itself is quantum safe because addresses are hashes of public keys rather than just naked public keys. QC won't significantly speed up hash inversion thus a QC won't be able to steal funds out of an arbitrary address. This is what I mean by bitcoin "layering the crypto" so as not to have a single point of failure. Sure bitcoin could have just used public keys as addresses. Instead it choose to use hash's of keys seemingly for no reason. Some of the facets of Satoshi's design are so genius that we only learn their purpose years later. >My hope is that quantum computer development runs into insurmountable barriers... ehhh maybe the GRIN devs should think about this now rather than later.