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RE: How to say something, with out saying it, and prove it
To match your scientist I feel a final step is missing and that is to post your hash to a blockchain like bitcoin. This way you can prove you said it at a particular time, say a hash of your invention. No one on earth can erase or edit existing data in a blockchain so there is no one to trust regarding the time stamp.
Yes, that is a great way to verify a claim at a particular time. You could also do that on the Ethereum blockchain by placing the hash as data in a transaction. In fact there is a Ethereum graffiti wall as at address
0x0000000000000000000000000000000000000000https://etherscan.io/address/0x0000000000000000000000000000000000000000
this is a cheaper option, however when i check some transactions on that address, there are no hashes in the data field at all
i can't find it either