Sanna can refer to: Places Sanna, Nordland, an island in Træna municipality, Nordland county, Norway Sanna, Ardnamurchan, a village in the far west of Scotland Sänna, a village in Rõuge Parish, Võru
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe072c0b58ae20b79934b2f77c8fea511cd8350b245042d63fbc716731113c71d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6bc12b86-3aec-4178-a308-35c6c3857004.json and https://artists.proofprofile.net/proofs/artist/6bc12b86-3aec-4178-a308-35c6c3857004.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).