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CC0 Public domain. No restrictions. Recommended

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Proof stamp optional

Off-chain only

Ed25519 signature stored on our servers. No blockchain record.

Free · always

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Polygon Proof

SHA-256 fingerprint anchored to Polygon mainnet. Queryable by anyone, forever.

3 free · then $0.49

Multi-Proof

Dual-chain: Polygon + Bitcoin via OpenTimestamps. Maximum permanence.

from $0.99

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