thumb|Achilles' sacrifice of Trojan prisoners, 4th-century BC fresco from Vulci. The eidolon of Patroclus is second from left. In ancient Greek literature, an eidolon (; 'image, idol, double, appari
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 0xeeb061e11d0ced42b86b4f67a216fc3fedd7ce4e5adb8c95502482127e5d900d. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cee2ccc7-7e55-49fe-89e2-b7ec02a59348.json and https://artists.proofprofile.net/proofs/artist/cee2ccc7-7e55-49fe-89e2-b7ec02a59348.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Modern Recording Company Presents Eidolon