In line with some estimates, it might have taken "quite a few hundred thousand decades on normal" using CPUs to find a legitimate block at the early 2015 trouble stage. BRD's safety features are a bit weak in that it supports two-factor authentication, but not multi-signature transactions. It's also https://thomasboleto02.blogspot.com/2023/09/bitcoin-btc-update-every-holder-should.html