> I don't see what role the blockchain plays here.
> [1] and who's to say there aren't multiple signed hashes on the blockchain anyway?
The timestamping of the blockchain is the use case. If multiple signed hashes exist, the latest one supersedes all the previous.
> What do you gain if the lawyer has to reveal it anyway? If you don't trust the lawyer[1], just give a hash of the document to the people who would be affected.
I'm afraid I don't understand. Who would hold the original text of the document in your plan?
Edit: Nevermind, I see what you mean, here. I see the issue as one of public record. If there was a revision to the will which no one in the family liked, and benefited some estranged cousin of yours who lived in another country, the family and the lawyer could conceivably hide the new will and the fact that you were dead from this cousin. Having it all on the blockchain prevents this.
> [1] and who's to say there aren't multiple signed hashes on the blockchain anyway?
The timestamping of the blockchain is the use case. If multiple signed hashes exist, the latest one supersedes all the previous.
> What do you gain if the lawyer has to reveal it anyway? If you don't trust the lawyer[1], just give a hash of the document to the people who would be affected.
I'm afraid I don't understand. Who would hold the original text of the document in your plan?
Edit: Nevermind, I see what you mean, here. I see the issue as one of public record. If there was a revision to the will which no one in the family liked, and benefited some estranged cousin of yours who lived in another country, the family and the lawyer could conceivably hide the new will and the fact that you were dead from this cousin. Having it all on the blockchain prevents this.