For eg, lock into vault with a regular private key, but link unlocking to something like a large traveling salesman problem that takes 5y
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If you take computing capability growth to be constant you can get something you expect to take 5 years on average, but that's only average
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You could factor in moore's law
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I guess if you had a large number of problems each of which took a day on average to resolve and chained them together
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"Produce a string that when hashed N times, hashes yields the phrase 'vgr is the best'"
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Ants solve a simlar problem of decentralized death oracles by constantly metabolizing their own death scent. Also:https://twitter.com/ultimape/status/843977966090670080 …
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1/ Am afraid whether this would be practical. The decryption process won't scale, economically & also in terms of number of messages.
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2/ Plus, such an extraction process isn't exact. The message could only be extracted in time range.
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3/ Looks like a fundamental puzzle in information theory. May not be possible classically. Perhaps only solvable using Quantum Mechanics!
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Problem is that if expected solution time is 1 day, you could build a lookup table and just solve all possible instances
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