Locked Accounts for those who are holding long term that can only be accessed through a large number of questions the user is asked when obtaining a steem account ( Not personal but inherently tricky questions only the creator of the account could confirm. )
A certain measure of data that verifies the user through a 24 hr web search by the user, monitored by a algorithmic bot that can analyze the data that user transferred and received during the time period.
eg)* User jumps onto 100 different web pages also filling out some forms along the way about the sites that he is visiting because these sites were used before his account creation, signifying that only he have made the account. proof of data
LifeKeys that track the user instead of the user tracking his keys.. The longer you live the stronger your seed grows verifying the user his life of work.
** 250 Steem Reward forthe person or group that manages to rack and hack my keys back. **