There are certain advantages to using a distributed and tamper-proof ledger that anyone can access at any given time. Moreover, this technology allows for authenticating documents and securely signing messages, making it a far more favorable solution than any other option in existence right now.
Signing external documents on the blockchain could be achieved by regular Bitcoin transactions. Additionally, a text could be written into the blockchain itself, either through miners or encoded in specific addresses. However, neither of these solutions are favorable in their current form.
MIT is a good player in this regard, as their campus is being used to recreate destroyed heritage in a participatory project. Recreating this lost culture through plexiglass jewelry arranged as pixels is an interesting spin on things.
Cryptographic heritage would allow keys to be more than just a key, as it would also represent a token, store of value and medium of communication.
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