1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0xdf969c359509be1172ed63bf3f7cb2e6b09b86d9369850fb2cc157181e79e45f. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad801767-0cb8-4e0b-9a15-987c4551c085.json and https://artists.proofprofile.net/proofs/artist/ad801767-0cb8-4e0b-9a15-987c4551c085.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Avaz Course: Vocal Radif of Persian Classical Music, Vol. 3
Mahur: Hesar-‌e Mahur, Zirafkan, Azarbayejani, Mahur-‌e Sagir, Forud
Mahur: Nahib (Araq), Mohayyer, Ashur, Hazin, Forud
Rast-Panjgah: Bayat-‌e Ajam, Bahar-‌e Nur, Qarache, Mobarqa, Sepehr, Forud
Rast-Panjgah: Araq, Nahib, Mohayyer, Ashur, Hazin
Rast-Panjgah: Rak-‌e Hendi, Safir-‌‌e Rak
Avaz Course: Vocal Radif of Persian Classical Music, Vol. 4
Avaz Course (Vocal Radif of Persian Classical Music), Vol. 2
Avaz Course (Vocal Radif of Persian Classical Music), Vol. 1