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 0xf1c72a230f61900716582e963f4c747cfef6b991c53e7748fd7bfe0538dc5364. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd4d43d4-3166-4382-a0ae-dccc8b4caafd.json and https://artists.proofprofile.net/proofs/artist/bd4d43d4-3166-4382-a0ae-dccc8b4caafd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
הלילות בכנען - שירי ראשונים (1882 - 1946)
The Klezmer Tradition In The Land Of Israel
Judeo-Spanish Moroccan Songs for the Life Cycle
The Western Sephardi Liturgical Tradition
The Hassidic Niggun as Sung by the Hassidim
With Songs They Respond - The Diwan of the Jews from Central Yemen
A Song Of Dawn - The Jerusalem Sephardi Baqqashot at the Har Tzyion Synagogue
Judeo-Spanish Songs for the Life Cycle in the Eastern Mediterranean
הליטורגיה של ביתא ישראל - נעימות התפילה של יהודי אתיופיה