thumb|upright=1.6|Athanasius Kircher's map of Atlantis, placing it in the middle of the Atlantic Ocean, from Mundus Subterraneus 1669, published in Amsterdam. The map is oriented with south at the top
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 0xc0e48bb25eaaaabec5fb9d2a906fdbc8d1b9645f43b0e903d4c8ab723dc8cb04. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1eab9b14-3abe-42e7-97a7-ae0ee51468bd.json and https://artists.proofprofile.net/proofs/artist/1eab9b14-3abe-42e7-97a7-ae0ee51468bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).