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 0x250c36b1017746374d3beeebf2f892729465a9d57b3ec023825ec308a196cfbd. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7fb3782c-c86e-48f8-b59e-53b3f1727a2c.json and https://artists.proofprofile.net/proofs/artist/7fb3782c-c86e-48f8-b59e-53b3f1727a2c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Katya Kabanova, JW I/8, Act I Scene 1: Introduction
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 0x715a7b1db9f556fee432764d79f349e7815a03221a01db87cb9532d78133d09a. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBDGQ2338901.
Katya Kabanova, JW I/8, Act II Scene 1: "Vida, chvástala jsi se"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eeb53bd881092f637ea1c7b0c3bb7b05c6e8c5258a3159e267ff5411bcf7db6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBDGQ2338913.
Katya Kabanova, JW I/8, Act II Scene 1: "Půjdu též se projít"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15161c68369b3a6a6a6586289a6a326850b5af14ebadba9ef2170a19e743365c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBDGQ2338914.
Katya Kabanova, JW I/8, Act I Scene 1: "Je baryňa doma?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b03eb4991a84caf227a9548324089cfa253199080f5426431c158b2b47e8f0. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/GBDGQ2338904.
Katya Kabanova, JW I/8, Act II Scene 2: "Za vodou, za vodičkou"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892cffc1e89df5465816f4a89f6be824b0b1bc5eee7b23aec289cad8726ccf45. 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/GBDGQ2338918.
Katya Kabanova, JW I/8, Act I Scene 2: "Víš co mi napadlo?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5587a45554b90b2667c813978735703c80473f500863bae3a0fec4fab166c2ed. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBDGQ2338908.
Katya Kabanova, JW I/8, Act I Scene 2: "Zdráva..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c101571efec014d49cca45adbd12e0f37dbbb5b5b14e3275ed2d451f525eb9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBDGQ2338909.
Katya Kabanova, JW I/8, Act I Scene 2: "Což pak už mne nemáš rád?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b72d4e55a4535f9dc19a4abf57f452b046651f968c573c657400262a345d49. 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/GBDGQ2338911.
Katya Kabanova, JW I/8, Act III Scene 1: "Celého mne to pokropilo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3296133cb1e92e0a4380af842dd1346fc92bda628d0f32ee504ebaf89a191f19. 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/GBDGQ2338923.
Katya Kabanova, JW I/8, Act I Scene 2: "Abych ani otce"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17f6c02cb7faf9ba74e854222a2660477d3ffaffc28ac9b64ac3ab30a561e11. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBDGQ2338912.
Katya Kabanova, JW I/8, Act III Scene 2: "Ach Glašo!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc801c5f59a3f025c01e80dcb10bd8e431199066cf48d96a85d6dff1e29b975f. 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/GBDGQ2338926.
Katya Kabanova, JW I/8, Act III Scene 2: "Vidět se s ním"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0d207da6a80102b9a294e323e786986ac002a1f8688f1359d24d5c774e8a38. 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/GBDGQ2338927.
Katya Kabanova, JW I/8, Act III Scene 2: "Ptáčci přiletí na mohylu"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86281ecfacf5073e2c454601a1bde4de79f0d23cb5abf6c07be3ae488a5e9650. 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/GBDGQ2338932.
Katya Kabanova, JW I/8, Act I Scene 1: "Zázrak!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296173a3d353f72d34fd5bdf0e9f85d3af2d31e85c18edb5cfa96796bbaf1537. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/GBDGQ2338902.
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
Katya Kabanova, JW I/8, Act I Scene 1: "Co pak je?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60eed8287beeb9d27c22b2707ba48665654d33d5a62ec7b485ab6ee16a52625d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBDGQ2338905.
Katya Kabanova, JW I/8, Act II Scene 2: "Nikoho tu není!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe7cd917c6839ee381154e44fb4c5743caf96fe2d4660446d2a04efebae9fe5. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBDGQ2338917.
Katya Kabanova, JW I/8, Act II Scene 2: "Nuže, shodli jste se?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6f77db6ace4b946919057d5f325b02fbff9f0ac3059a4a87d02d61d44e7d83. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/GBDGQ2338920.
Katya Kabanova, JW I/8, Act II Scene 2: "Choď si, dívka, do času"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4bdb4cf5e184ce390cc8d8c99df8062765391689171652512c8fbea926a04e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBDGQ2338921.
Katya Kabanova, JW I/8, Act III Scene 1: Introduction - "Krápe!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72bb626552f3b3e2d99db4b439517608b0bae07b2ee46d2248cc0edcb806398. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBDGQ2338922.
Katya Kabanova, JW I/8, Act III Scene 1: "Tu jdou! Maminka jde s nimi!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261f1081b88207f764cef60c0c38bf0c90645171552db3669a34515a94e336ec. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBDGQ2338925.
Janáček: Glagolitic Mass: III. Kyrie (1927 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2b8b047a8775773f36cb55d289e169796f529d45e757d2b8d650e1c6650664. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBPFW2200003.
Janáček: Glagolitic Mass: VII. Agnus Dei (1927 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755a9717c98b2a9b48f7c380e5f757617695082b5dafd4f13d63904b5db34d08. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBPFW2200007.
Janáček: Glagolitic Mass: IV. Gloria (1927 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eaa82da77289f0771c90e0eb39e46a5151977da479909d36dc6265b41f1eccb. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/GBPFW2200004.
Janáček: Glagolitic Mass: V. Credo (1927 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa222724be2be364bcc41a6983eb8dae8df1eb2d14d14cb8a5c734bd2aecd3b. 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/GBPFW2200005.
Janáček: Glagolitic Mass: VI. Sanctus (1927 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47549a5a7a4232a2bc8d900afe11917362d4fe21c256a602d32949a79b42bd97. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/GBPFW2200006.
Chorszenen und Konzertchöre in Rundfunkaufnahmen ab 1938
Die Meistersinger von Nürnberg, WWV 96: Silentium! Silentium!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925beb334e4510324cb2cbbc05be3a76e9342f2860b61c9f887212bfc3032cbd. 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/DEAD61703101.