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OpenTimestamps.

The open standard used to anchor ledger records to the Bitcoin blockchain, producing an independently verifiable proof-of-existence timestamp.

What it means

The open standard used to anchor ledger records to the Bitcoin blockchain, producing an independently verifiable proof-of-existence timestamp.

What goes wrong

It proves a hash existed at a time. It proves nothing about whether what was hashed was true — that is what the invariants are for.

You will need next
Where it appears on the protocol
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