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 0x6ab21720a892b6c6401ba83d196f97aca945f286365f1247a3101c41eec38734. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2ad097e-bf65-4aaa-814f-d3e7cca81828.json and https://artists.proofprofile.net/proofs/artist/f2ad097e-bf65-4aaa-814f-d3e7cca81828.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Zelenka: Sanctus et Agnus Dei - Tůma: Stabat Mater. Music from 18th Century Prague
Stabat Mater in G Minor: I. Stabat Mater
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 0x592a5cc94b868fe50f99b20639b6d0f36244e799a98484e317a5ade85d257219. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304265 — a six-check JSON result.
Stabat Mater in G Minor: II. O quam tristis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65fd2a2ec3733155cbf186368e7d7d1d4983b81ef78a2c321c776529805c250. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304266 — a six-check JSON result.
Stabat Mater in G Minor: III. Quis est homo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188c597ab45a7f099ea39f053029250c93818b6839802f58e61904807dfbe823. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304267 — a six-check JSON result.
Stabat Mater in G Minor: IV. Pro peccatis suae gentis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfffc68186144933e80c4c0816f84a3e4d1d4810ef9fe09a89397030c851078ba. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304268 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30209ec7d6b1569638c27900bc755dfc78e04f62920999a4e0aa48551d420416. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304269 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb447b87b6d21aa1dabf31650b60f8c7a212f99eb0bb756c326ffec6e0aa628dd. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304270 — a six-check JSON result.
Stabat Mater in G Minor: VII. Sancta Mater
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3c8c45340ce75cb647cab63e205134c2d6cb7efc8eefde77ba0e8fd106dadd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304271 — a six-check JSON result.
Stabat Mater in G Minor: VIII. Fac me tecum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181ca3d87a8df44b98a0832aac9ff23aa78921010a9d58da01137a231a5f07a6. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304272 — a six-check JSON result.
Stabat Mater in G Minor: IX. Virgo virginum praeclara
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c32c8eb48cde6d3116e64f5e1619c0b4b8c609c6a17d108751ce42ea193b7f. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304273 — a six-check JSON result.
Stabat Mater in G Minor: XI. Quando corpus morietur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74fee5ac49d403749cb15c1f99f6b3a35071c0024fa722cf756d97105bd1f99. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304275 — a six-check JSON result.
Sonata for 2 Violins and Basso continuo in F Major: I. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bbc0b84ac182a99054b284bd8fb973a2b4cb696a207ecf4855cf687ee034ec. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304251 — a six-check JSON result.
Sonata for 2 Violins and Basso continuo in F Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4abff00827abcb0f3673bf5423c98c6e396bf026dd06aa729e777503343fdd61. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304252 — a six-check JSON result.
Sonata for 2 Violins and Basso continuo in F Major: III. Andante e sempre piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9184e85a2d0dc32c954ed94685f48d2107d8e6c642bac74dc8aa475250a78a5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304253 — a six-check JSON result.
10 Sub tuum praesidium, ZWV 157: No. 1 in G Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1522d83afc3dbb62b4cad537371928e086539799f8b2c710a4e06e4bb00ff4f8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304262 — a six-check JSON result.
Sanctus et Agnus Dei in D Minor: I. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd414c1e0b046661d0e228809f9cb66143b11ed5b76d4d3ad91d96ce373dbe45e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304294 — a six-check JSON result.
Sanctus et Agnus Dei in D Minor: II. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9621ee812e6956302dd96df5a916d0e7a16b95795b4f6b98b2731770291fa53f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304295 — a six-check JSON result.
Sanctus et Agnus Dei in D Minor: IV. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2405cdee010e3d43f0621c36f503b32c38298f91732799d16089bb99cea8659b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304297 — a six-check JSON result.
10 Sub tuum praesidium, ZWV 157: No. 2 in C Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa08158b7ac0b720abb2bf0f9dbd91f14f755bbef8a848345a09bc8c928d213f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304263 — a six-check JSON result.
10 Sub tuum praesidium, ZWV 157: No. 3 in D Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31e32eca11e89a4912152d55ab6de67d92bc2e7e309e3f0f35f72a5d48d6bbe. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA161304264 — a six-check JSON result.
Stefani: Cud mniemany, czyli Krakowiacy i Górale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4dfb3d8e5d4e5c04e68c0bca16f6770c5d44f60f6371231745221036e3cc6d9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLC701730501 — a six-check JSON result.
Zelenka: I penitenti al sepolchro del redentore, ZWV 63
I penitenti al sepolchro del redentore, ZWV 63: Aria 'Squarceia le chiome'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d20fc57efdbb2ad74deef34c7e5f6f4ee287240a622236a885350b28598927. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70901930 — a six-check JSON result.