Heleni Barjau i Vallmitjana (Barcelona, 1921 - Mexico City, 2000), was a Catalan tenor noted for his recordings of La Traviata and Il trittico with Victoria de los Ángeles. Though born in Spain, he fl
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 0x039b11fbd45d6aa176ac56dc1c09535b16ff70a11ee7e15a04fea8777257b6d6. Chain 2 (Bitcoin): anchored in block 953973 (2026-06-16T16:37:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b1fd849-ba6a-4822-a55b-5b7d1021467c.json and https://artists.proofprofile.net/proofs/artist/2b1fd849-ba6a-4822-a55b-5b7d1021467c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Verdi: La traviata, Act 1: "Un dì felice, eterea" (Alfredo, Violetta)
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 0x48ac57f8e4db1e707ea6675ee264d33618aed311cb05c4185ba588f29cd60ced. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAYC9201502.
Verdi: La traviata, Act 1: "Ebbene? Che diavol fate?" (Gastone, Violetta, Alfredo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3095539b953961c56aca49776a3e4e67b47f54e288c693a661fc5400e06178a6. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBAYC9201503.
Verdi: La traviata, Act 1: "È strano... è strano!" (Violetta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8dccf5b5cf5243056fbc8089ac8c9405969e1547c374547942ebdfb0bfd4b9. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBAYC9201505.
Verdi: La traviata, Act 1: "Ah, fors'è lui che l'anima" (Violetta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bc8c2946d081c2c80d7dab40e13b7fc24bf78d92a4a7584b3a25f3b4cb8a29. 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/GBAYC9201506.
Verdi: La traviata, Act 1: "Follie! Follie!... Delirio vano è questo!" (Violetta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2136df373f925ba895ead111e69c3f86a5f577821790ab4c22e8f62d8e75008. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBAYC9201507.
Verdi: La traviata, Act 2: "De'miei bollenti spiriti" (Alfredo, Annina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67487f3a7d19d482e81a644d2cfc3fac08d98e1b62543d874e9b45d6d816d4d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAYC9201510.
Verdi: La traviata, Act 2: "Un dì, quando le veneri" (Violetta, Germont)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd488b0183cde1e0ce4fff732f6575b9674372284220f1f97de691f541b50a4af. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAYC9201515.
Verdi: La traviata, Act 2: "Dammi tu forza, o cielo!" (Violetta, Annina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e72358553c2c7b9bbd744f5beccfa40fbef155bef0aa6a1a56ee98af5cf845. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBAYC9201518.
Verdi: La traviata, Act 1: Brindisi. "Libiamo ne' lieti calici" (Coro, Alfredo, Violetta, Flora, Marchese, Gastone, Barone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceea57a1c81057bd8ff523bfd1023689d67e475d735fd2e62b3144afab0b8817. 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/GBAYC9201500.
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
Verdi: La traviata, Act 1: "Che è ciò?" (Coro, Alfredo, Violetta, Flora, Marchese, Gastone, Barone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d529c73d110511fbba204d84761ee3d94a3042548b3c1a3e44d6ad598a9050f. 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/GBAYC9201501.
Verdi: La traviata, Act 1: "Si ridesta in ciel l'aurora" (Coro, Violetta, Flora, Marchese, Gastone, Barone, Alfredo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e846564204e6830deb6d735fc66178d79b8f88773b4d5217dc28fa1201b8c3. 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/GBAYC9201504.
Verdi: La traviata, Act 1: "Sempre libera" (Violetta, Alfredo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891ba9d894eca372cbd5e7f2aeb37840e7db7bd97f55771e56aab009ac144bab. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBAYC9201508.
Verdi: La traviata, Act 2: "Lunge da lei per me non v'ha diletto!" (Alfredo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62083060061dbd258325863c76000c161dee11dccd89baa4ebe313de1118b3bf. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/GBAYC9201509.