thumb|right|A typical non-dial red phone used for hotlines. This one is a prop which is on display in the Jimmy Carter Library and Museum, erroneously representing the Moscow–Washington hotline.The re
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 0x279768da93311bd596db162b33b0abd344c75a8f8d27cbe6ac21fcdad43efcc9. 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/6b982aea-143b-4142-ab81-499d115a3a18.json and https://artists.proofprofile.net/proofs/artist/6b982aea-143b-4142-ab81-499d115a3a18.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).