That depends on whether the public key has been exposed.
Bitcoin addresses encode the ripemd160 hash of the public key, so by default when payments are made to new addresses they are not quantum crackable.
But when someone spends from an address they publish the public key to the chain as part of the spend. From then on, any new deposits sent to the same address are at risk of quantum attack
Bitcoin addresses encode the ripemd160 hash of the public key, so by default when payments are made to new addresses they are not quantum crackable.
But when someone spends from an address they publish the public key to the chain as part of the spend. From then on, any new deposits sent to the same address are at risk of quantum attack