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 0x350f8fe05c8717152bd76339328cb3381a4ea68bae9c754b283892b69a5ae984. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eefbd744-8d7a-4c3e-94d2-bf179df990f9.json and https://artists.proofprofile.net/proofs/artist/eefbd744-8d7a-4c3e-94d2-bf179df990f9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xe40184d427d11992739a24bb21a94796c497bf8ba2381427049c06279e202665. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBB9900301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e9b439c07630190d24c9590d60f99c1cf9bf732a61f90378aef47fcd6de8eb. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GBBBB9900304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89e34aaec615aea42f87782ea2c7a0dd84732518690082d1db090c41d7130cc. 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/GBBBB9900309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e28d667f21a0f40ca7a1dc7f9ab72660a431f3e42145a901a2890c9556ddf51. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBBBB9900311.
Don Giovanni, K. 527: Act II Scene 15: Don Giovanni, a cenar teco (Il Commendatore, Don Giovanni, Leporello, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf627f97f5a968fecf7ee65565414bf36a8e974e5c5c26ce0bf897c7e266d83d. 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/HKI190136514.
Wiener Staatsoper Live: Nina Stemme Sings Wagner
Don Carlo - Trovatore - Otello - Traviata - Puritani - Giuramento - Bohème - Tosca - Fanciulla del West - Andrea Chénier - Pagliacci - Prophète
Tannhäuser, WWV 70, Act I: Overture (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a39f0de8798437046b0e69872a7e5fc9831a272be3cd09fdb0ed0f1e0492b7. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/GB6CE1800224.
Tannhäuser, WWV 70, Act II: Freudig begrüssen wir die edle Halle (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bf3eab66d346c13b558e31e46361a8d5a9afae64bf71dfceabda2e321b8901. 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/GB6CE1800242.
Il barbiere di Siviglia (The Barber of Seville): Act I Duetto: Dunque io son... tu non m'inganni? (Rosina, Figaro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1424ae68664daba697e45b6add4736ecdf1675415af809ba0e88e5d7f4c427de. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199706407.
Le nozze di Figaro, K. 492, Act III: Duettino: Canzonetta sull aria… Che soave zeffiretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e42d45aa3a49d8a1a4144138b4d0ef852a8e0b8fd995f45dd8d39675e4e8d3. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/HKI190348218.
Don Giovanni, K. 527, Act II: Don Giovanni, a cenar teco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf627f97f5a968fecf7ee65565414bf36a8e974e5c5c26ce0bf897c7e266d83d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190136514.
A Guided Tour of the Classical Era, Vol. 2
Starke Stücke. Wolfgang Amadeus Mozart. Don Giovanni
Vocal Recital: Kerl, Torsten - Beethoven / Weber, C. / Wagner / Strauss, R. / Korngold
Die Meistersinger von Nurnberg (The Mastersingers of Nuremberg): Act III: Morgenlich leuchtend in rosigem Schein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1b905a7c00711c39bd66d11e0edfe38b111ad621d380ea95ebfab508b15ced. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEU920332007.
Die tote Stadt, Op. 12, Act III: O Freund, ich werde sie nicht wiedersehen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf873895bdd3a080b57c8e9d4d61d91ce35fac04ace07b62b1d6e91d8c2cf71. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEU920332013.