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Opentimestamps does this for free.

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Thank you for that. Didn't know about opentimestamps. Will take a look.

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Cool! Check out opentimestamps. Batches up document digests into a merkle tree and commits the root in a block. Means its free to use because it can timestamp thousands of documents/files in a single transaction. And there's a command-line client!

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Unfortunately, it seems like the project has been inactive for quite some time. Anyone have any news on this?

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deleted by author

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That link doesn't seem to be working for me.

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https://archive.ph/bGomy

The trick is in the screenshot with the OP_RETURN as destination address, I would never have thought to just try that.

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interesting. thank you for that info!

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What's the use case for this? I can't think of any real world use case

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A few but one that comes to mind is using it to verify an important document such as a Will is verifiable and not tampered with after the fact.

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Found a way to do this for free* using Sparrow wallet: https://www.cornpharmer.com/adding-op_return-data-using-sparrow-and-embit/

*tx fees

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got a working link?

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very nice, thanks for sharing

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My god that's expensive. You can do it yourself easily.

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