250px|thumb|Dutch Topographic map of Brummen, June 2015 Brummen () is a municipality and a village in eastern Netherlands. Brummen has a small railway station - Brummen railway station on the line
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b691fb1be1a42be8c67ca051fdac4d7c9891b33fc59eed9cb3638fcabcbdda. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e078b7c5-e159-403d-8864-7d34bd1b71f7.json and https://artists.proofprofile.net/proofs/artist/e078b7c5-e159-403d-8864-7d34bd1b71f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).