Krassimira Stoyanova (; born 16 August 1962) is a Bulgarian soprano. Born in Veliko Tarnovo, she studied violin at the Conservatory and singing and violin at the Plovdiv Music Academy. She made her p
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 0xcd68d238b65bbabc6066fc13b53acb2098a517cb55ebb28c690a6a93bef96c2b. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6bb727e7-349b-4825-acaa-845d8dc58066.json and https://artists.proofprofile.net/proofs/artist/6bb727e7-349b-4825-acaa-845d8dc58066.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Un ballo in maschera, Act I: Preludio (Live)
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 0x885b6678255f7691235a4103f7249a86665b0834200146fb6dfdbf5922607ed1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEB951998028.
Un ballo in maschera, Act I Scene 1: Posa in pace (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b500b855ab81cc1013b9f06151276ac4cf98e9565fa2906c0c759017ea7fc1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB951998029.
Un ballo in maschera, Act I Scene 1: Amici miei, soldati (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2f02b27c8230fb6b3133fe7d2e982e4aa85c80a4cc61e4f8aa03bd81d5c487. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB951998030.
Un ballo in maschera, Act I Scene 1: Il cenno mio di lá con essi attendi (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db1c58f3e38b5aab77bd4d1759e525d63e58c6a3e74e3be5acedf0b17422561. 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/DEB951998031.
Un ballo in maschera, Act I Scene 1: Alla vita che t'arride (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d40233ede81b5df1d58a3d274abca2c81836a0bb6bb3a3b62807f37b0e4af5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEB951998032.
Un ballo in maschera, Act I Scene 1: Il primo giudice (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8e86994826045085280718cd7d4528f9765e33be444674b69bfcc2c79dcaac. 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/DEB951998033.
Un ballo in maschera, Act I Scene 2: Zitti, l'incanto non dèssi turbare (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe595dce4272103fe5046496202cce4b57be5078296e2dd38a08edec867d70639. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB951998034.
Un ballo in maschera, Act I Scene 2: Arrivo il primo! (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe497e371aa539a0a24f420fcd6e8831f3ba6bfa1486de838afb58221f619234d. 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/DEB951998035.
Un ballo in maschera, Act I Scene 2: Che v'agita così? (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec105e3d2cd03817d5542e3465d8df194dc728c6da34a901b5114031c3ddafb. 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/DEB951998037.
Un ballo in maschera, Act I Scene 2: Su, profetessa (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049ea92c0edce52f31453c95373415ddef5f7e63b762087715cab1140185ef58. 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/DEB951998038.
Un ballo in maschera, Act I Scene 2: Finisici il vaticinio (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1534e981be144bab1ceb99786f329611fa051708f43257f8d6e84d761ea4d7bf. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEB951998040.
Petite messe solennelle, Gloria: V. Laudamus te
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa698c724dc257b400a7a8be22a0d15e156b719e5c922c9c5e82b46c77758b2d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140011050.
Petite messe solennelle, Gloria: VII. Qui tollis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca37a077d7b603654fb852b3bae60821c4e8d8112f089edea75e3e3636163bb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140011080.
Petite messe solennelle, Credo: X. Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115302d404a61e0bd2ac506d85db2f25cfd261e16ff69fada007074c1b02cd4f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140011110.
Petite messe solennelle, Credo: XI. Crucifixus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafdf9ca8b728db79dddf6b2ca119bcb70444ec7441c298a9639f8367f6a545f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140011120.
Petite messe solennelle, Credo: XII. Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9d7db1926013a3301e2a92853978f656997724b7b5ea72ad415360f9d7d6ff. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140011130.
Petite messe solennelle, Credo: XIII. Et vitam venturi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228cd48cda6b87d751e9f35c7217fa9b80faaabee6c882874a0fe5a35e0248ec. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140011140.