Raina Yakimova Kabaivanska (; born 15 December 1934) is a Bulgarian opera singer, one of the leading lirico-spinto sopranos of her generation, particularly associated with Verdi and Puccini, although
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 0x503287c23187495462e05c33df44ca4a639dbe085c634e9c6a25243adc2ff71b. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f2ba4f8-0974-4cfd-9aea-28caebb426be.json and https://artists.proofprofile.net/proofs/artist/7f2ba4f8-0974-4cfd-9aea-28caebb426be.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Don Carlo - Trovatore - Otello - Traviata - Puritani - Giuramento - Bohème - Tosca - Fanciulla del West - Andrea Chénier - Pagliacci - Prophète
Nesun Dorma - Vesti la guiba and Other Opera Blockbusters
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 0x0c3534534793bd0060694150a6cbc4eeab7482ef676e765af08828d134605f67. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USSJ10915726 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd00b2f5c063b8d5fa114349cccdd662246d9f9db4e6c5a4aa642901b100052a. 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/USSJ10813553 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5e1f58bff4e34940ab3b72a86fcb7bac526ba95fd3a8d55663cc117f5826e1. 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/USSJ10813568 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad338bf36a64bdeed6fdb9c4887a43b0f6b12a15f86a64092f30b1a39ed34f9. 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/USSJ10813570 — a six-check JSON result.
Il trovatore, Act I: All'erta! all'erta! - Live at Großes Festspielhaus, Salzburg, 1962
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Die Zauberflote (The Magic Flute), K. 620, Act II: The Queen of the Night's Aria - "Der Hölle Rache Kocht in Meinem Herzen"
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Il mito dell'opera: Flaviano Labò & Magda Olivero
The Marriage of Figaro, K. 492: Overture
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Opera Arias - Mozart, W. A. / Bellini, V. / Verdi, G. / Rossini, G. / Gounod, C. / Massenet, J. / Puccini, G. / Schmidt, F. / Wagner, R.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3129944993acaea752622771b3a8167e6a68b4e89293d82ce608598a28ef51eb. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/ITV709900610 — a six-check JSON result.
Raina Kabaivanska The concert Happy birthday '60
Raina Kabaivanska: Opera Recital - Arias from operas of Giuseppe Verdi
Spontini - Cherubini - Donizetti - Rossini - Bellini - Verdi: Opera Masterpieces
Giuseppe Verdi - Umberto Giordano - Alfredo Catalani - Jules Massenet - Lubomir Pipkov: Opera Masterpieces, Vol2
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8f4e736925733804703fe04c7e965e263f336de23590b04bd7db6860452955. 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/USSJ10806583 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fa49f8340b766517f81ad231eac39caf4e09a76c26bac7dcc286be48e3ba46. 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/USSJ10806584 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a014877ce4308996c21a525a2c6b4e3977a9dc05f2db271a22dcea28039959. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USSJ10806585 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2c8eecc8c046025a585d772e319a2a737cf423ade9f53a1856844261eff242. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USSJ10806586 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e52f46a467a120df7af61e8e671b2a0519e723202b0bfa7ef72e4be7ba819a. 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/USSJ10806587 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9621bedff413ec169e2c72ec1b742e5e3f7cb6b2163d0b2af3a6240720b1c439. 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/USSJ10806588 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23147387e21fbce7bde0d5fc4e67e6ecb78f9de982ed0a3f05b71ceaa461ebca. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSJ10806589 — a six-check JSON result.
Cosi fan tutte, K. 588: "Smanie implacabili"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbda2bfb65e1a25027367d8a001151ef72a2385ff8cd25fd2b05514e7e6b721. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USSJ10806590 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2315f4049dd0d78a4c00e67848a7bc3e8cd9e58471167c1c585af777c57213. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USSJ10806591 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1171b976d068b919bd9417f7a6b079297e7c7ad62bd1f4ee19eb825f76a5c8c0. 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/USSJ10806592 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e33b9364381241612baa1f464c605dca7f070eb65664a14401cf0774d959d63. 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/USSJ10806593 — a six-check JSON result.
The Barber of Seville: "Una voce poco fa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbb1a1dc3e5ad410def288a10d98c222aae68afc4f763bc175628c100ce7f61. 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/USSJ10806594 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1bbd064a388c2c7cab8b7289bbf28ff4e227eea8632ac3b9e4ab72db77eddc0. 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/USSJ10806595 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd114329b5dde066f59dedbc3f08b6b9fd6eefead2891c7725d6a892ea63301. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USSJ10806596 — a six-check JSON result.
Samson et Dalila Aria Dalila: "Mon Coeur"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4935a94c24e5f47588dff98a1fa297279f4cccf8de4a6dc0ab0540b334ea1111. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USSJ10806598 — a six-check JSON result.
Rigoletto: Gilda: "Gualtier Malde...Caro nome"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77333265d1c464b22a37abc8d5eff56c03d6516c517181a203ec23c56a6361f5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USSJ10806599 — a six-check JSON result.
The Magic Flute, K. 620: Act II. "Der Holle Rache Kocht In Meinem Herzen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151b41431fcddca5aa7f4c680a4308b291fd72713bd90f7ac7561d8286826ecb. 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/USSJ10806600 — a six-check JSON result.
La Traviata: Act 1: Alfredo - Violetta - Coro: "Libiamo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55050d2594ab0d64b3a4cc8730c1fb1b3207156c0574b06232f16ee7728c6103. 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/USSJ10806601 — a six-check JSON result.
Les grandes voix bulgares, vol. 2 : Les grands airs italiens pour soprano
Alfredo Catalani - La Wally : Air de Wally. Ebben ? Ne Andro lontana
Orchestre symphonique de la radio bulgare
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Alessandro Marcello: Concerto per oboe, archi e continuo in re minore - I Andante spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5014a1f632f9bab40e576b335e33ac6fb16c9be15923c6b71f2539d9b58f55. 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/GBCRW9850501 — a six-check JSON result.
Classical Romance: The Greatest Melodies Volume 3
Verdi, Puccini, Cilea, Strauss : Raina Kabaivanska Today
The Barber of Seville: Act II: Contro un cor che accende amore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93161abc1fe5d96f6ea251929f25598566916467b313aec44e683307460855b2. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USSJ10915009 — a six-check JSON result.
The Bulgarian Opera Voices, Vol. 1: Arias from Operas