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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba4c5dc7a16427e0bce4cbd74f37e46196f4fe3565eaac65c31b17da823d7c5. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/122380b3-7b1f-4c78-8720-e56837e8e364.json and https://artists.proofprofile.net/proofs/artist/122380b3-7b1f-4c78-8720-e56837e8e364.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cancionero musical de palacio: Rodrigo Martinez
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173f98517d63a939eda1d0323e7bca5292d0da4c8fd0a60f4509e5b73f17c3c4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKI192027901.
Canzoni overo sonate concertate per chiesa e camera, Op. 12: No. 20, Ciaccona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e414f985e1918ce2fd850006e49ea6af1941aef5d53fdaf61d9d5125e8191e. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/HKI192027904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d49c04c1f1f94288b6a3071d3366f4b23c1d768977c9f83a9940fc536fba1ea. 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/HKI192027905.
Il primo libro (Excerpts): No. 3, L'Eroica
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57690bbfafac753b5966f591a970e5005f07d4628febc7e1bc596113598ce9c9. 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/HKI192027906.
Canzonette spirituali e morali: Passacaglia della vita
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9383bea385c63097038f739a842b2aefab2cda152368ba292eb104c4db7d7ee2. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKI192027907.
Tonos y villancicos, Book 2: Chacona "A la vida bona"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73451190480130c33a98b2858bc3066c055696fabef96d21233b52dde6ae5d13. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/HKI192027909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bff57e071e582f1dcc70de26d121fec4f08e93de6f70d7e41af3dc70486d6fc. 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/HKI192027911.
Sonate, arie et correnti, Op. 3: No. 24, Aria quinta sopra la bergamasca (Arr. for Soprano & Chamber Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03190fd570edb094c59b3294905b5c5cb06fee2e58d39cf2d13a933a4a720de. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKI192027914.