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 0x34e6ccb761ddfd1e1963479d3c6a5cd23bcb9641edf97b6f3e2fc7f91f757f2d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38aee043-e6f2-47d0-a9ef-86f22d97ad3d.json and https://artists.proofprofile.net/proofs/artist/38aee043-e6f2-47d0-a9ef-86f22d97ad3d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x19335cddc46afb0401507c783db428732ed57c11a7cb134e3fb193dc08569ae2. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QMPU51248703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b8cb63652b1802e6e7801a2b69b9d412862cf3707ffb9ce85af4fc333ffb02. Chain 2 (Bitcoin): anchored in block 957611 (2026-07-11T21:33:50Z), 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/QMPU51248705.
Eugene Onegin, Op. 24, Act I Scene 1: No. 5a, Scene and Quartet "Mes-dames! Ya na sebya vzyal smelost"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705837b6ffe7c29324cb83c13dc870da047bf66370d391bf57191e992dea0a63. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/UK2Y21309071.
Eugene Onegin, Op. 24, Act I Scene 1: No. 5b, Quartet "Skazhi, kotoraya Tatyana"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1510f26ef2914aa86f4c84395560d43c48ba0109684977edccf4c5b6f7fbeb43. 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/UK2Y21309072.
Eugene Onegin, Op. 24, Act I Scene 1: No. 6a, Scene "Kak schastliv, kak schastliv ya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545735ee7689413915764c8aed030a5abb1d88d2fcad4a5194af8394d846e952. 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/UK2Y21309073.
Eugene Onegin, Op. 24, Act I Scene 1: No. 7, Final Scene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc9c0949e85ab0b17308c500f28aca73644d7ba76ed82633b9c816ba7f91893. 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/UK2Y21309075.
Eugene Onegin, Op. 24, Act I Scene 3: No. 12b, Scene "Vy mne pisali, ne otpiraytes"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff57df153ccef9ec34bb09af3adccc5793fdc2c7a8f456a505100fa59eb8e55. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/UK2Y21801580.
Eugene Onegin, Op. 24, Act I Scene 3: No. 12c, Onegin's Aria "Kogda by zhizn domashnim krugom"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe20b41fc9d2d5ae199c5873586ad94f91d82da5da37bfc858c9724dccee0966. 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/UK2Y21801581.
Eugene Onegin, Op. 24, Act II Scene 1: No. 13, Waltz with Scene and Chorus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1aad09295ded3c1b7e44ae7474cece80b32287a344015af6ceb2650e691f7c8. 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/UK2Y21801583.
Eugene Onegin, Op. 24, Act II Scene 1: No. 14a, Scene "Uzhel ya zasluzhil ot vas nasmeshku etu?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12527665964683e479760039274afa48ece73723b9ceee1a81938d3e1c78ac9. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/UK2Y21801584.
Eugene Onegin, Op. 24, Act II Scene 1: No. 15b, Scene "Ty ne tantsuesh, Lenskiy?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde70d2404423c0755f730759a97bb15a277c6a24d1fb35af0bb41493ce030d83. 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/UK2Y21801587.
Eugene Onegin, Op. 24, Act II Scene 1: No. 16, Final "V vashem dome!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb699fc881866758dc6dff5b031446bdd6b7f604e8853936ea72a5052c3b45a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21801588.
Eugene Onegin, Op. 24, Act II Scene 2: No. 18a, Duel Scene "A, vot oni!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa17c2386465db406f8c8bace43b13b28e774cc8da39af0725a0881d74509c54. 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/UK2Y21801591.
Eugene Onegin, Op. 24, Act II Scene 2: No. 18b, Duel Scene "Vragi! Davno li drug ot druga?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f37bd91ae8659090fbc3f71fd19742e56e04c889683c85d959b81c21886985. 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/UK2Y21801592.
Eugene Onegin, Op. 24, Act III Scene 1: No. 20a, Scene "I zdes, mne skuchno!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fcfa99069fdeb7f0ab2fc6ae0b1e1309e1b88b11682f4ffcd7f48ce22bacef. 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/UK2Y21801594.
Eugene Onegin, Op. 24, Act III Scene 1: No. 20c, Scene "Knyaginya Gremina!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970189d4f696a55d93af7bb942c0d354437682a691cf82979512ac11ca6ccf2a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/UK2Y21801596.
Eugene Onegin, Op. 24, Act III Scene 1: No. 20e, Scene "Itak, poydem, tebya predstavlyu ya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395590d4c0d561a67c4927816cf2566fcaff00f0309b1ce4ebd07d91d2c314e8. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21801598.
Eugene Onegin, Op. 24, Act III Scene 1: No. 21, Onegin's Arioso and Ecossaise "Uzhel ta samaya Tat'yana?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf577c0084008a8e0d8b4b23703b60663eda0a17022f5a4666347ee3d86f406f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/UK2Y21801599.
Eugene Onegin, Op. 24, Act III Scene 2: No. 22a, Final Scene "O! Kak mne tyazhelo!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c86a8a4b95a6ec796c553dca9bc458971422cd08d90f699f87ce7743efd7083. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21801600.
Eugene Onegin, Op. 24, Act III Scene 2: No. 22b, Final Scene "Onegin, ya togda molozhe"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99fff4738e7610f6a2584029bad2e3122b480ab3cb69a3e103f0369a5ab1255. 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/UK2Y21801601.