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 0xde821e0f4c79675c6b388392be21f208718dd7ab8eee8dab10861496723d98e6. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df43d7b4-21c7-441a-912b-a726babf073b.json and https://artists.proofprofile.net/proofs/artist/df43d7b4-21c7-441a-912b-a726babf073b.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 0x4dcc0d6b98456f8f879ec1c606ab0c8014d0ac1db01c3f70e6358e4bef362e1e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLC351648902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9900baae23a2c908309ada4af5ed565fb23ffc55a88df082621c492dc5d330ca. 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/NLC351648903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc682c1e5523c66b04fc58bab09f8068e594823a00d7247fa83ab9f91a9ba3223. 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/NLC351648906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dcdfac7edd4a5cd1160eaef3a6163d35d56a726dac7873317a237d14e63e853. 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/NLC351648912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a6734ecc745e07efb544d37a42f6462522ce1b7d7eb94cf9245d62a6744bbd. 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/NLRZ60500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d7a5b857adfe432a9d495c65eba7495abcc341b1a2344b1784821d72304baa. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLRZ60500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c8cbd874672f5650f16e2e1b57a50bb41fbbe999770e8a1188bbf67a6f7ab3. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLRZ60500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e2d2ec6a76fcca1c4467a74662bd8b06567f2d4c748a67b060965694d533ec. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NLRZ60500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d51f2addc69780beba228c279cda456ef0ba8aeb041936288551646f6226521. 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/NLRZ60500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337c3e2023d047f4f2944255517910572b561fd329abc88f24d808c31945af3e. 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/NLRZ60500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157133489083e4539c6eaa1654ccf45c342c56b71558dd893bc1cc835a1a7f67. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ60500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850a08713d18fe23a31cbf8fe5c06a6b8b880a594ecc8e578e5704bc8977ac81. 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/NLRZ60500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1139195965838586dba8f2571dcd4835a7d2d6a49e98c5d627dbe030df2501. 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/NLRZ60500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e184dd222dce95c5fbfa3273345c8ab49c410d439c6b0414ba8b876428958d. 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/NLC350337603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8516eac8ededd7f607666beeae84b3653923a165a0ac42c4e59c56295853ece. 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/NLC350133801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c9658a683d8bff4bec82ed21a0ffa4fddd80708b4ef17f2d9dbb299608ff0e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLC350133802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581f0616d21f53c42ec6f6bac040a75241b638c3622649ba65a5dec446ba977b. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NLC350133803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232b19041d24ba4fc15fe5b060ba701c8a80b1412c45a44f339fe100bc917162. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLC350133805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05be368e454e91d29832c9bca38bdf08ad33270b8f3beae677747f1f41787120. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLC350133806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f3adaf715417fae04cc7b7dfe7c7d69a478ec4551b8b7f819f2bc023038135. 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/NLC350133807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c0c588e607500bfa282f901dd3f1aae32ede42b97848ee06f40b5f1c9d9a6c. 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/NLC350133808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cab57af5f84adee89e7b0ffe55d2e784373afe9d524575b69a86fe173f2a26f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLC350133809.
Matrozenkoor uit "Der Fliegende Holländer"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc2bad9751acef25975856bfcadfbd6cef6c7038c02cc3cc62c8d0dfd856071. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLC350133810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b1ffb2bd5d56d1cd9f82b64d88b61756e52ac8a75fb7685e1432e190725cef. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLC350133811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0092c2765e7f446e6b41c37898fe1f88924924375741a00727ea6bb0dc441f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLC350133812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bc41357b1054b019ed554732792cb423f55a4246507bbde24378ff61a86374. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLC350133813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a6d6dfbe4ecf7cf0644ccb853c16ec73c37208af44baf4d47600ea5fe03c35. 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/NLC350133814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0504367039f4ec048e641b5ef6ab15d33e36f29a2789483bf326e14f20df1e6e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLC359625101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56260d272ca9bfa1f07d1cd01ed8908cb29ab7a94a64e6a517f396aaaf366441. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NLC359625102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd4ac3a3d9d987c36f022942dc10fd5cc822ab6300b949e0bb96c3fc912970a. 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/NLC359625104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca19cf7c5c265622080c1d7466c64d0afd1602a013ad80ce01cd0ac3fdef8c77. 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/NLC359625108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c8d18d43d01ce55682d911c6fb7acc56366355fcb286bcd8f8f56065cdf272. 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/NLC359625115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d23e5e5204fc3aac5e1847b19c1d1ff1c66225812bcead4428eda9f015a96e6. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLC359625118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d881541fe8395859dcb40cc6cea2e3c7ccdc847ed23415169816a517aff50ca. 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/NLC351348001.
Koninklijk Mannenkoor Die Haghe Sanghers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5482bc03c9666c69b9806f23fb1e9ca9b4ca1725021d940c8d1aceeb4701f01c. 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/NLC351348003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe430a0049abf91888698da43214ec108696920a20ff96efc3ea51191b42e527c. 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/NLC351348004.
Koninklijke Zangvereniging Mastreechter Staar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e72c7fd9a8771df09e7d3f44ea6c2d96dd4b97d2b3fa8bf86520c7aa055ee95. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLC351348006.
Katwijks Christelijk Mannenkoor Jubilate
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94f94b1eec015bfbc32a24d9b23f8708911031e6ad2ff5089548d70481c21e5. 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/NLC351348007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdf2959bdaff2123cd0f118b5e1ea494252ca4eb5a6a76549edc214d22e8c7a. 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/NLC351348008.
Christelijke Gemengde Zangvereniging "Jubilate Deo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805f9edb016d3476c12445d8fe3428fc8645ebd0d73bb6f7ba1c5c319364285d. 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/NLC351348012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4752c218ea56ca0b04e22ff022b1ab11d94a14092c8b643358a034dce6e7cf. 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/NLC351348014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7689fb91ecca9ce7bf471b1bede75f0c27e1cf744cedb7e138e10c6b1b4dd4a6. 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/NLC351348017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c197899b86387f2e8a047097d3b26092aed5d8a581358bfa4c027e9a1efd57. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLC351348018.
Ad-hoc Meisjeskoor van het Greydanuscollege
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eebc2416484c56c4ae72388d4927c2b7ff0050cef64c78a99d03bd620b5c715. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLC351348303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7cb52ea5ffaa5d5fcf2aaf1db25347dd88d5739653168d22dbc262390d085c6. 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/NLC351348318.
Meisjesgroep van de Guido de Bresschool uit Ommen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96374faa297603e35e15957e7a6c290eb183c4d92e4b7e131ca8c6414f4a7067. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLC351348323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565b64df3f476ba430f5e225bbd504f48f65ed4ee5d25aaf959138d9168581bf. 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/NLC351348101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e2520a34bcc04434c3b7ff6ca8f00fe1d0a1d0cd4c95cc6a67f8b54a29fef5. 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/NLC351348117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec80e07394b60a9ec3ad09f0ff582fad8a139c4cdb0cfdbdd08c1e172d8b7654. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLC351348122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1705ec25a03a54c7ec0960bba37e1bf578118d7b990dc64a87aab3aa048e05. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLC351348218.