Alexandrina Pendatchanska (sometimes written as Alexandrina Pendachanska) () (born 24 September 1970) is a Bulgarian operatic soprano. Increasingly, she is known professionally as Alex Penda. Career
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 0x679fbd8dc9b571f35556bf417effb6ab7fe79e01834fbce94fc4056576892979. 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/f2d185c8-fca4-4712-9e4b-992cb7270ae8.json and https://artists.proofprofile.net/proofs/artist/f2d185c8-fca4-4712-9e4b-992cb7270ae8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Opera Arias (Soprano): Pendatchanska, Alexandrina - Gounod, C.-F. / Massenet, J. / Rossini, G. / Bellini, V. / Verdi, G. / Tchaikovsky, P.I.
Idomeneo, K. 366, Atto I Scena 6: No. 4, Aria "Tutte nel cor vi sento" (Elettra)
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 0xb6f96fbb32a598afc6562a6c751a4bedead09e738ccd22507b6b3d8e20cf6594. 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/FRZ140831120.
Idomeneo, K. 366, Atto I Scena 6: Recitativo "Estinto è Idomeneo?" (Elettra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bc2000681dff52448fb060d985633c1efc41fef0c7e3d4edd217f18fdc2814. 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/FRZ140831110.
Idomeneo, K. 366, Atto III Scena 3: No. 21, Quartetto "Andrò ramingo e solo" (Idamante, Ilia, Idomeneo, Elettra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ddb9f41dd36947e69a4c45829ee346424950a939375bd0861d9fb3a627e267. 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/FRZ140832230.
Idomeneo, K. 366, Atto I Scena 4 - 5: Recitativo "Prence, signor" (Elettra, Idamante) - Recitativo "Ma quel pianto che annunzia?" (Idamante, Arbace, Ilia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab3e6a1c5035c1a271bb383a3f0734b8f93565b600f89333fd7d6008525a9fd. 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/FRZ140831100.