why does the old key have to be NOT any older usage than 30 days? (when recovering by signing with old and new keys) Many people have intermittent lifestyles, they drift away from usage of a system or web site, then drift back, then away... easily months.

So, you drift away from steemit... and 5 months later, you get a notification email (from some hypothetical future steem-blockchain-monitoring service that you subscribed to ages ago) "you have changed your steem keys. or if you HAVEN'T in fact changed your steem keys, then you've been hacked, and now is the time to begin recovery!"

so... you begin recovery... you contact your trusted recovery person.....

and all is in vain because you haven't used your old key for 5 months!

so.... what's the purpose of the 30 day usage rule? i mean, the blockchain stores the corresponding public old keys (what you call "locks" in your article) FOREVER! so no TECHNICAL obstacle exists to recovery process!

am i missing something obvious???!!!