thumb|Johann Georg Theodor Grässe, ca. 1880. Johann Georg Theodor Grässe (also Graesse; 31 January 1814 – 27 August 1885) was a German bibliographer and literary historian. He worked in Dresden at the
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 0xbea997469b527a0e0e6bda46fadec537c82b6dcb13c4e499df2710ae96818f15. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11beabd9-25d0-48fd-bb20-1a79ab3db1f7.json and https://artists.proofprofile.net/proofs/artist/11beabd9-25d0-48fd-bb20-1a79ab3db1f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).