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 0x1e22c3cd85a2f634e4bbe2196f5b412d2c12cadb8b597a058a774a8b31c4576b. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2436193f-b1c4-4ef0-894a-a4ba32d2eb1b.json and https://artists.proofprofile.net/proofs/artist/2436193f-b1c4-4ef0-894a-a4ba32d2eb1b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schindler's List Theme (Arr. for Solo Violin)
L'arte dell'arco: Cinquanta variazioni sulla gavotta più bella del Corelli (435 Hz)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ce5f69ffec131d3800fc431a71b68eea7d9c5f2ca773a7136576b9b3273103. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD542001542.
L'arte dell'arco, B. F11: Variazione No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640885ed2674e2295a71801f20dabc2e134601a652ece2c7c7c2b5af670c0d00. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD542001543.
L'arte dell'arco, B. F11: Variazione No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e39cd95ce2ee46ba6016e322b846bfb24441c03f36910bf0176562e114e37e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD542001545.
L'arte dell'arco, B. F11: Variazione No. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db1f8fe27160fd7fa2cdf812855a418d72a0d017e4b8001debf7727c63a97a2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD542001546.