right|thumb|200px|Jozef Kundlák Jozef Kundlák (born October 12, 1956) is a Slovak tenor. Biography Born in Bratislava, he studied at the local Conservatory with Professor Ida Černecka. After graduat
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040d7040838a04bdfbcf5d32b5c8cfba961718be335ab59e6a75f38035be04d0. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9c126a9-b39c-4323-be79-1974e08f007a.json and https://artists.proofprofile.net/proofs/artist/a9c126a9-b39c-4323-be79-1974e08f007a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc22cba164cda6c66760260d6e319f8958e4fce67ddab30fa6f7bed7c9cc7cd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199278112.
Requiem In D Minor, K. 626: Introit: Requiem Aeternam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f143e5c2c16c548859767567fffda1d608365fb1228761f40e4e7e32375ed4b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199278101.
Requiem In D Minor, K. 626: Kyrie Eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cf7a55b765e192e9288f8da4f4b8f4745a6e6f74698080f3183dcc3751ebc6. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HKI199278102.
Requiem In D Minor, K. 626: Sequence: I. Dies Irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38c9655f9911f653b719444401f47b6306c44385d1f9a8bab96fcb890fa6915. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKI199278103.
Requiem In D Minor, K. 626: Sequence: II. Tuba Mirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc136943adf2b40e9697141364522ffe932be113488b198f9528db5123c796605. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKI199278104.
Requiem In D Minor, K. 626: Sequence: III. Rex Tremendae Majestatis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6f5d76882186b07bc80181ee8c5cda26bdcd820ae992ee88702c6cbc54277a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199278105.
Requiem In D Minor, K. 626: Sequence: IV. Recordare, Jesu Pie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803b16ed87aca116afbfeb2cf7d483656bce1a5abc3d2f33909214f739e5e802. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199278106.
Requiem In D Minor, K. 626: Sequence: V. Confutatis Maledictis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dc386f66731ef810bb9eb357a7fcb4e5507deea27df24dd624de484a08075f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199278107.
Requiem In D Minor, K. 626: Sequence: VI. Lacrimosa Dies Illa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5602646eb4e2ce652aa09a11c513292aa7e9c10aa2f1742dd0c6e6e8224209. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199278108.
Requiem In D Minor, K. 626: Offertory: I. Domine Jesu Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143dd35a93fc66d7fdb3c2b2b3e27e5e0f9ad79b9753ffa7d5dcbc243068e128. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HKI199278109.
Requiem In D Minor, K. 626: Offertory: II. Hostias Et Preces
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24aa7b910fa91e47c6b0c4208b29ea4b1c7dceba458a76159d89572e257a64b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HKI199278110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5047bf98ccce74759a9ac3a29380f8d9a726f15438f70940bd5bec940ea553. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199278111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc22cba164cda6c66760260d6e319f8958e4fce67ddab30fa6f7bed7c9cc7cd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKI199278112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5110b06f89c1abb8ef8100be5996d85783f1567d8e4c95c23ecd4103b25d4e2a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199278113.
Requiem In D Minor, K. 626: Communion: Lux Aeterna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d16badce4dac73eccdf5a2f0d97fd59f2fa85e8dce57fd9d45b8247bc5fd90. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKI199278114.