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 0xed58ab2e678d595831b591b361058fdde43aa89d95c2eb6b202cbc23f413f4dc. 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/c687c027-49e1-4760-aacb-a4663d5787cb.json and https://artists.proofprofile.net/proofs/artist/c687c027-49e1-4760-aacb-a4663d5787cb.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x786a25ccb854fdf55dc3147171b04349aabbab940e875a3213190af9e663b342. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419587 — a six-check JSON result.
O Zosi Niszczycielce Historia Smutna Wielce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730429b26998ccd33bd1b9270e7ce66828a17ec5a21300b4af3b47251f018822. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419624 — a six-check JSON result.
O Tym, Jak Z Porządkiem Było, Ale Dobrze Się Skończyło
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63d1aae93ba837ff5f9a741bef03e1093faad8d24af36b111ac36d7ee8b3bbe. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419627 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7584d09fef7001586fbb331da29b8e3a9910bc12aad46c1bf6a9e231c4eb2468. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419636 — a six-check JSON result.
O Klarci Ze Szmatki I O Sukience W Kwiatki
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1158b5f7da4be817cbb0dbe0d8380f434b477f53a6acbedf096115c4feae66df. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419671 — a six-check JSON result.
O Tym, Co Zrobił Jacek, I O Nosie Jak Placek
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e420ca379ac0a8fc97e8e10e9c0b25b5b4be98ad5b8806cf90c06aafa09924. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419673 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7802c35011b304e05ac44e75a251aa0385f5533765208f7cd7540d784551e7. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419675 — a six-check JSON result.
O Kwiatkach W Szkole I O Kaktusie, Co Kole
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a4f0fba2343875105739982185ea58699bafbd16f40752a914c69edd7b1753. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419678 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9ff440efb8d0bbb808e719fbab6d9fea6018e12affe38346cead11d22fb9f1. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419679 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1410f38f7a2055efeceb7b96042f93505c96c07ecc8e853efaa2db4565e0344d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419682 — a six-check JSON result.
Jak Się Ze Mną Poznali Ci, Co W Książkach Mieszkali
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4d886eb8c7c7268b48d38df3a6c7d92accede50299be7bfb6cecbc74accf60. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419687 — a six-check JSON result.
O Tym, Jak Od Lodzi Dostałem Samochodzik
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758c1d4b3d6d1b33e29159b380034b913e7eb0b246d3e102ee0919e986058b5b. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419709 — a six-check JSON result.
Kogo Się Pantofel Boi I O Tym, Co Fikuś Nabroił
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0b04b4897fc8e16930bc4b4f9884accad305f2328036f61ea4f88e934d97c1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419719 — a six-check JSON result.
Bawimy Się W Chowanki - Same Niespodzianki
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01d79706e0771dc2f53e454947ed6e962d6928029ddbeab8b4773a552f64038. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419721 — a six-check JSON result.
O Tym, Jak Każdy Spieszy Naszą Panią Ucieszyć
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe98ac578bb497e729aa70be074193bb251d75eb3785d537cac11806d599f69b. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419726 — a six-check JSON result.
O Wydmuszkach, Placku, O Mruczku, Fikusiu I Nieznośnym Jacku
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8d162c9c5ba942210bde0baee748f7d911ff13d9ddd9002019045ba752fd57. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419730 — a six-check JSON result.
O Dzielnych Ratownikach Z Tosinego Piórnika
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3f305627bb74ed4195aad355b74b5c2b2013a59d31f2ca4e50e58c7fcbdc74. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJC2419732 — a six-check JSON result.
O Jacku-Bazgrocie, Aucie Z Babcinego Kapcia I O Piecuchu Kocie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bcb799c7115b399f255f9e7e4976f7084c72ec8609b074eec04c6d94969aa3. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419738 — a six-check JSON result.
Tosiu, Teraz Zapamiętasz, Jak Szanować Elementarz!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac2b8dab971f68cc763b1b0cb551286f8f74d8b80efb14df6dc7ae629712a72. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419742 — a six-check JSON result.
O Sreberku, O Złocie I O Wesołej Robocie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971bc210823da8d8b301200d266f6bcf03549c4dec45b21a260f6201874d8c4e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419745 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9bfa62ee1e44ac428eca5844c72c9d89dc4552e2ad68bfc021bc1676b3a068. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419747 — a six-check JSON result.
O Tym, Jak Mnie Szkaradnie Łobuz Z Choinki Kradnie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84cf18c4849ddd2d85b2c16d3c333985a46b6f59fc2b581ca6bb0e8508593ac. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJC2419753 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15795d0b26b1e28cf43c78b9428dcf670e398a00fde5f6d4d8bcdf404b0379eb. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419761 — a six-check JSON result.
O Witku, O Zbytku, O Oparzeniu I O Tosi Ogłoszeniu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ccadf37548646cfef927319aaf6d725fa89c8dcc00dfe972a6ca7902f9ed78. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419778 — a six-check JSON result.
O Tym, Jak to Się Staje, Że Mnie Witek Tosi Oddaje
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46682a289a98ac34e7af6c8c2726d76961825868974bf5adbb3aadac900bab22. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419787 — a six-check JSON result.
Dużo Radości I Krzyku, Że Znowu Jestem W Piórniku
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa058afd772d639d1be65db1f1e8e2f07a74936cf585ced842beb2489d5b26f9a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJB2419804 — a six-check JSON result.