Stoyanka Savova Nikolova (), best known by her stage name Elena Nicolai () (24 January 1905 – 24 October 1993), was a Bulgarian operatic mezzo-soprano. Early life and training thumb|Elena Nicolai (
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 0xbd983870744239890ccf86d2016b8854b0755031a33699b6dd095b4e7b733ca5. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2dc3b7bb-f8eb-401a-9451-fc2c42edbfa1.json and https://artists.proofprofile.net/proofs/artist/2dc3b7bb-f8eb-401a-9451-fc2c42edbfa1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mario Del Monaco: His First Classical London Records of Pagliacci & Cavalleria Rusticana
Récital Mario Del Monaco - Mascagni: Cavalleria rusticana (Mono Version)
Mascagni: Cavalleria rusticana, extraits (Mono Version)
Great Opera [La Forza Del Destino (Historic Complete Recording)]
Verdi: Don Carlo (Christoff, Filippeschi, Gobbi) (1954)
La Forza del Destino (1997 - Remaster), Act I: Sinfonia
Orchestra Del Teatro Alla Scala Di Milan
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 0x2e65c5ceb798bd4617700964d7ef6bde715d152c6b14a8e184e89ad88e4e1a6c. 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/GBAYC9702598.
La Forza del Destino (1997 - Remaster), Act I: Buona notte, mia figlia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42c7fd8d9547344fe587fb05cacc6b55fdd0035e72fca9dfa3d5db6862c887e. 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/GBAYC9702599.
La Forza del Destino (1997 - Remaster), Act I: Me, pellegrina ed orfana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bea6a659063ea512d1c39e93f3b2523cba9118d6207788f7bdf2eec0f076e2a. 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/GBAYC9702601.
La Forza del Destino (1997 - Remaster), Act I: Ah, per sempre, o mio bell'angiol
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893ca7346e0204f99b528af10cdca123835f0ef03a2587ce46b3ef399232b91b. 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/GBAYC9702603.
La Forza del Destino (1997 - Remaster), Act II: Al suon del tamburo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73fa39cbc94ce33a5b334ff9b67fbdc60bf7c798dd2e2d288fd3bdb3e017000. 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/GBAYC9702610.
La Forza del Destino (1997 - Remaster), Act II: Padre Eterno Signor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb320f1c1adea7a83bbde5e3cf96df9f285307a3543241fe4c8479c998e4b9a8f. 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/GBAYC9702611.
La Forza del Destino (1997 - Remaster), Act II: Sono giunta! Grazie o Dio!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9ffd16d0bb25b7ffc945d85893c036d0182efdad4e735684da231063aa07d2. 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/GBAYC9702616.
Verdi: La forza del destino, Act 2 Scene 10: Finale, "La Vergine degli Angeli" (Leonora, Padre Guardiano, Frati)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff0ae0b3b5e7de5a5956d29b196a73e4092d5c1e0803077a36695fe8d2a8348. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/GBAYC9702622.
Verdi: La forza del destino (1954 - Serafin) - Callas Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8da765accce4f5baf13956f790b00cd02d5de1c7e59f5cd3dbccb6c44df1dd7. 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/GBAYC1400430.
Verdi: Forza Del Destino (La) (Callas, Tucker, Serafin) (1954)
La forza del destino: Act II Scene 2: La Vergine degli Angeli (Chorus, Leonora)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846c50c2a0bd105adb12c8d72c0b84efca4333e797701cb71400c276dba94b54. 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/HKI190779122.
Grandi Voci – Mario del Monaco canta Puccini e il verismo - Una collana con registrazioni originali Decca e Deutsche Grammophon rimasterizzate con le tecniche più moderne che ne garantiscono
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3695721892b0c9aaf7ca7a5b7cb5ec0339a388f9e5bbe30f02cc57e336f61676. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075411480.
Madama Butterfly / Act 2: "Addio fiorito asil"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c46a47b2427eceb6f291ef1d2ef7ab2ae4773e0e607408c9dc9173c7b34681. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBF075610590.
Gluck - Monteverdi - Brahms: Selected works
Verdi - Gluck - Saint-Saëns: Selected Works
Mascagni: Cavalleria Rusticana / Leoncavallo: Pagliacci
Orchestra dell'Accademia Nazionale di Santa Cecilia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394a7ec9b31a5e15e85c3af2a74a0da84502ee04d682c1794f1350aa2298d079. 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/GBF075340824.
Verdi Historical Opera Edition, Vol. 1: Oberto, Giorno di Regno & Nabucco
Mascagni & Verdi: Chœurs d'opéras (Mono Version)