alt=Refer to caption|upright=1.2|thumb|An illustration of Agartha within the hollow Earth, from Walter Siegmeister's 1960 book Agharta Agartha (variously spelled as Agharta, Aghartta, Agharti, among m
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 0xd4fbc8ff7e7980eaf931f36aae4fab9c20e173e076b7742a7cf5defcf27e7ad0. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/305e8131-cd86-42c4-a3b4-e53510b53c0e.json and https://artists.proofprofile.net/proofs/artist/305e8131-cd86-42c4-a3b4-e53510b53c0e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.