How would this compare to posting the hash in a public and frequently backed up way such that the date would be generally established by archives? For example, you could take out a classified ad with the hash in a newspaper, or post to Usenet so Google Groups archives it, or even submit it as a story to HN. (Or do all of the above and more at once.) Obviously, those aren't as technically sweet, but they seem workable. I'd be interested in knowing if there are more subtle tradeoffs involved.
The Bitcoin blockchain will presumably be around for the foreseeable future, and can't under any circumstance be modified by anyone. That's the main reason you'd want proof there.
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How would this compare to posting the hash in a public and frequently backed up way such that the date would be generally established by archives? For example, you could take out a classified ad with the hash in a newspaper, or post to Usenet so Google Groups archives it, or even submit it as a story to HN. (Or do all of the above and more at once.) Obviously, those aren't as technically sweet, but they seem workable. I'd be interested in knowing if there are more subtle tradeoffs involved.
The Bitcoin blockchain will presumably be around for the foreseeable future, and can't under any circumstance be modified by anyone. That's the main reason you'd want proof there.