Yes, you may be thinking of OpenTimestamps. And Inkan does i...

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  "content": "Yes, you may be thinking of OpenTimestamps. And Inkan does in fact use OpenTimestamps to timestamp individual Nostr events on Bitcoin. Inkan only works when there is proof that a signed version of an event existed as of some particular time, and this proof is provided through BTC timestamping using OpenTimestamps.\n\nHowever, the declarations of \"delegation of signing authority\" and \"revocation of signing authority\" that I mentioned also need to be timestamped.  Unlike in the case of regular Nostr events, this timestamping needs to be done in a manner that allows you to later retrieve the substantive  content of the declaration by querying the blockchain. Bitcoin timestamping does not allow for this, at least not in any straightforward way, because what's actually recorded on Bitcoin is a *hash* that is the root of a Merkle tree. And you can't extract the content of the timestamped items from that hash. Ethereum, on the other hand, has easy mechanisms for recording these \"delegations of signing authority\" and \"revocations of signing authority\" in a manner that makes their content queriable / retrievable.\n\nSo in both cases, the ultimate purpose of using blockchains is to provide timestamps. The reason Ethereum is used for delegation and revocation declarations is that Ethereum provides straightforward methods for retrieving the content of these declarations from the chain.",
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