Rembrandt Harmenszoon van Rijn (15 July 1606 – 4 October 1669) was a Dutch Golden Age painter, printmaker, and draughtsman. He is generally considered one of the greatest visual artists in the history
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 0x50d3e63b71ebbfb1ca64538a702c78a4ac5febd35e02512ca832e02cfa9818d9. 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/41b6877f-625b-4e0a-916c-186e524390ce.json and https://artists.proofprofile.net/proofs/artist/41b6877f-625b-4e0a-916c-186e524390ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).