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 0x2272715402d5787193a2db302b719a0e3da33c45988d823c5654389e9d5caa35. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22d7da93-89a1-48ba-9dbb-31abea1e811b.json and https://artists.proofprofile.net/proofs/artist/22d7da93-89a1-48ba-9dbb-31abea1e811b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Carmen, fantasie brillante, Op. 3, No. 3: Fantaisie brillante on Bizet's Carmen, Op. 3, No. 3
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 0x601e867714906214a45cf9086375fd365e1f5a1dbee74fc17c79a3cad0f8ae6c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/HKI190717601 — a six-check JSON result.
3 Duos, Op. 63: 3 Duos on themes from Wagner's operas, Op. 63: No. 3. Lohengrin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec17b76698dc63794a547b0c726c64adc26b9af5d120ce4c8b49c269ce21473. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190717602 — a six-check JSON result.
Mavra (arr. S. Dushkin): Mavra: Russian Maiden's Song, "Parasha's Aria" (arr. S. Dushkin for violin and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b6d2ce0d3268d8a974ccfa7d1c709b0835998128b643bd7f335868a302b797. 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/HKI190717603 — a six-check JSON result.
Ainadamar: Desde mi ventana (From My Window) (arr. for 2 violins and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1dacac0344b9f7ae0d3532e87c5e078b9aecb68b7287d1d6d2425d8c98b9cf. 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/HKI190717604 — a six-check JSON result.
7 Stucke nach der Dreigroschenoper: No. 1. Moritat vom Mackie Messer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9899a89a19102d31e8b99b612620000488bf7e17dd172e9ec33c7811a3ee52ef. 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/HKI190717605 — a six-check JSON result.
Les pecheurs de perles (The Pearl Fishers), Act I: Au fond du temple saint (arr. for violin, viola and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a000f53e0d3fc9c7c4715aff5e33b2be0772824a869a216e48ef9dc114784fb. 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/HKI190717608 — a six-check JSON result.
Le roi d'Ys, Act III: Vainement, ma bien-aimiee, "Aubade" (arr. J. Szigeti for violin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cff08fce656409aac85d6aed5e3b09ec48e255a703d62911555988b3e4d258. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190717609 — a six-check JSON result.
I Lombardi alla prima crociata: Preludio (Arr. B. Loeb for Violin & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c8311adb95ba04e7d06a44b64f1d525a8ea8930f304a797e6ec16ec1247fe9. 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/HKI191509501 — a six-check JSON result.
Eugene Onegin, Op. 24: Wohin seid ihr entschwunden "Lensky's Aria" (Arr. L. Auer for Violin & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88aad07900519e3f542701a35311b93f299a54455819cc5382c1a2c449cebcd. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/HKI191509502 — a six-check JSON result.
Nouvelle fantaisie sur Faust, Op. 13 (Version for Violin & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318b9d284d91db8dcda58f6f3a5bdedbfc1a8c193f7e5307336f547e7c5eff1c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191509504 — a six-check JSON result.
Orfeo ed Euridice: Danse des champs elysées "Melodie" (Arr. F. Kreisler for Violin & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb203e0d0824b0a4b2f6e432d0059172e06a906d9dac6814ef1c9f78a0139e301. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191509505 — a six-check JSON result.
A cremonai hegedűs, Op. 40: Solo de luthier (Version for Violin & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbffacbc6bba1055c7031fbfa371932b7f9031f89766fcd1d9804ec1c46443f. 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/HKI191509506 — a six-check JSON result.
Variations on a Theme of Rossini, H. 290 (Arr. B. Loeb for Violin & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07a9e29fef954d12d57a55d2280153e3cb5c6046f735d6424e8d89074882c1e. 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/HKI191509507 — a six-check JSON result.
Serse, HWV 40: Aria. Ombra mai fu "Largo" (arr. A. Wilhelmj for Violin & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc9d548c1bdb0a68792252cad9671d5cdebb45b0bf45ad48ab82c572a93b2cb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191509508 — a six-check JSON result.
La forza del destino: Solenne in quest'ora (Arr. B. Loeb for Violin, Viola & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f0beb6711c5483fabfd1a770fe3e599d2748f32c13bb738a44a2d075d892d1. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191509510 — a six-check JSON result.