Kamer is a given name. Notable people with the name include: Surname: Hiltje Maas-van de Kamer (born 1941), botanist at the Institute of Systematic Botany at Utrecht University Nadja Kamer (born 1986
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 0x5130555af3a73beaf635044814fa560ef43519fac2ce5b89ff2d05117bd50ef7. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b34b45a-97be-4952-a898-aa5190c6387a.json and https://artists.proofprofile.net/proofs/artist/8b34b45a-97be-4952-a898-aa5190c6387a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).