Music on hold (MOH) or hold music is the business practice of playing recorded music to fill the silence that would be heard by telephone callers who have been placed on hold. It is especially common
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ba7a56aacfde5aebc5f96a7651bbdb6fa14b4b8ce34c1b259f1ef28170fb94. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62be7bf3-5a76-4697-b30d-51daf1cf1694.json and https://artists.proofprofile.net/proofs/artist/62be7bf3-5a76-4697-b30d-51daf1cf1694.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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