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 0xa3e864d19d09ac4a91903fea8c86173521559ea8893ab5d129d1091c88c89b16. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01da562c-2a30-4d2a-a9ac-19437bceacad.json and https://artists.proofprofile.net/proofs/artist/01da562c-2a30-4d2a-a9ac-19437bceacad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Milken Archive Digital Volume 12, Album 1: Legend of Toil and Celebration - Songs of Solidarity, Social Awareness, and Yiddish Americana
Weinberg: Piano Concerto No. 2 / String Quartet Op. 55 / Shabbat Ba'Aretz