So the key is never to keep the private key decrypted, anywhere. And to make it extremely hard to brute-force. https://en.bitcoin.it/wiki/BIP_0038 https://en.b

So the key is never to keep the private key decrypted, anywhere. And to make it extremely hard to brute-force. https://en.bitcoin.it/wiki/BIP_0038 https://en.bitcoin.it/wiki/BIP_0038 You could also split/shard it into pieces where M of N pieces are required to reconstitute the original key. http://point-at-infinity.org/ssss/ http://point-at-infinity.org/ssss/