Tamara Andreyevna Milashkina (née Mirnenko; ; 13 September 1934 – 10 January 2024) was a Russian lyric and dramatic soprano. A member of the Bolshoi Theatre from 1958 to 1989, she also appeared at La
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 0x5b599867c1337048534db708fbf699acad047519a35e4649451995b65ff067f2. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8021005a-7f9c-428c-b437-4e5da6d6e971.json and https://artists.proofprofile.net/proofs/artist/8021005a-7f9c-428c-b437-4e5da6d6e971.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Borodin, Rimsky-Korsakov, Tchaikovsky: Arias from Operas
The Queen of Spades, Op. 68, Act I Scene 1: Duet and Scene "Schastlivy den"
Tchaikovsky: The Queen of Spades, Op. 68
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 0x5462f70ee7861246fe92a32db38ee8b1c427a5b15a5b242fd65bcc17ff4abc15. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/UK2Y21800854.
The Queen of Spades, Op. 68, Act I Scene 1: Quintet and Scene "Mne strashno!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aa7b33edd54984d80931a6bba6f89e8e576ffae3bd6cee23a7f004b235d466. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/UK2Y21800855.
The Queen of Spades, Op. 68, Act I Scene 2: Duet "Uzh vecher"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c05cb1f680fd9c4cee6eaa282cf1d1acdaa2e5dc5cebf6a0e14ca12d9e8e85f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21800859.
The Queen of Spades, Op. 68, Act I Scene 2: Scene, Romance and Russian Song with Chorus "Obvorozhitelno!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6a2663bf2a32c500a0cdb537700b5e29ff1adc26ef0cf03ba5f6da1f0bdf5c. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/UK2Y21800860.
The Queen of Spades, Op. 68, Act I Scene 2: Final Scene "Pora uzh raschoditsya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed69756075eecb59f21ce1092f7e80e0c303604adf951c966bc01f3b23c1910. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/UK2Y21800864.
The Queen of Spades, Op. 68, Act I Scene 2: Final Scene "Otkuda eti slyozy?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2450aaac91272c6ac282498a028570b51a8187adfd3aac98c1166ae21473284. 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/UK2Y21800865.
The Queen of Spades, Op. 68, Act I Scene 2: Final Scene "Ostanovites!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9704174e3a7416b83bf4127e62cd30aa76237484481120bbbd5348fd6f797ec2. 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/UK2Y21800866.
The Queen of Spades, Op. 68, Act I Scene 2: Final Scene "Liza, otvori"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1b60c9491df47c8fb96196f11d28c8d2d626508f487270d900e669e6645c5c. 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/UK2Y21800868.
The Queen of Spades, Op. 68, Act I Scene 2: Final Scene "O, poshchadi menya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc1d12a1d23bf85bd1b3575b325d01fbbaaf20ccb931b9eacf0b1acc54b2287. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21800870.
The Queen of Spades, Op. 68, Act II Scene 3: Scene and Yeletsky's Aria "Vy tak pechalny"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ff405325a41c537d345f63252b4c6ee00b4ffefba2bee89e76040717f6fd9f. 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/UK2Y21800873.
The Queen of Spades, Op. 68, Act II Scene 3: Final Scene "Kto pylko i strastno lyubya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4073c967ae0aabaed556a89a4bca7d00b105e24cddbd9310d7d01e11e79d2923. 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/UK2Y21800880.
The Queen of Spades, Op. 68, Act II Scene 4: Scene and Chorus "Shagi!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749a1b7e5d69d9cdc9826b31c64bd55b19820ff3db2e18076b1e38f9dcf2c007. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/UK2Y21800882.
The Queen of Spades, Op. 68, Act II Scene 4: Final Scene "Ona mertva!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2010ba0fcb8200bd2e0b563dd01d9000c815d79a3900727475c48086b750e12f. 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/UK2Y21800886.
The Queen of Spades, Op. 68, Act III Scene 6: Scene and Lisa's Arioso "Uzh polnoch blizitsya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dfc0f698b92bae260920ac4a39cf570c287259874fbfa1ac7348cd768449969. 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/UK2Y21800890.
The Queen of Spades, Op. 68, Act III Scene 6: Scene and Lisa's Arioso "Akh, istomilas ya gorem"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5daf6925d25e0481eeae4d361d3bf407637611a1119230dc7f82f740c1e45e. 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/UK2Y21800891.
The Queen of Spades, Op. 68, Act III Scene 6: Scene and Duet "A, yesli mne v otvet chasy probyut?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ddca50b921902a560c325cd277cf3e22092e6990091fc79e48fea385b79621. 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/UK2Y21800892.
The Queen of Spades, Op. 68, Act III Scene 6: Scene and Duet "Tak eto pravda?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d60ce06792b63a4f8b7f1d4d2357de780d5eaf1c7911a72a1a7c161806fa6c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/UK2Y21800893.