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 0x4ca22a19d0bfff67562f485d23da534de2efb35f7b70e13568f4a18a371375f7. Chain 2 (Bitcoin): anchored in block 954047 (2026-06-17T04:56:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/412ce933-bf92-4ec7-a01b-ad7537987f14.json and https://artists.proofprofile.net/proofs/artist/412ce933-bf92-4ec7-a01b-ad7537987f14.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 0xf748a1664080b13d1bf17ad0717e76eb0b496f5c28f74980c3e1d5bc0966da8c. 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/GBKPL2167168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c17b57cd2d2909d8e45801868a2f82c87b1d702e557465b951f93339dc5340. 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/GBKPL2164459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f35866d6977da023b8389d276e324a92dbba79bb48bd10ecffe82eecf2ac74e. 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/GBKPL2036759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa475bd33f1cd5746291fa633280bc5f5715d0062aa5ae60b96f192ddc63fc7d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKPL2036760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06771067e8278b525e0e51400a687027ed084e02208009558929ac29cceea693. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/GBKPL2036382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdf85fdb3bf812d2629106cc9742b4f6af5da819b7cd046c6267122c668f9d8. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBKPL2031042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43043084c9ce847eacffd0287fb20a2fa0ea2aef8552d971a971363ec15c1265. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GBKPL2017883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e12b72c71cd19b3ab141b7b1a0f0c992bf2e1c2f3e59c241e59ae246867f8a7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6N22339011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d68734d0806036416c14f14331769e611a5150a31deb06079f57588157ae3a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM4TW2353493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96441b0adebfc6ad98c471b3b2538a55836f133de8a956729c8ef1a4012afaf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMDA72217261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a8dad96ffec42d5559bff174815415ea5a53b6152cb1775135c9ee770b58ac. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6N22339013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a42df6ec73cb433e971064340129d6e290075906d41ffc427825a1e9ae60e4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6N22339017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e24d8a6a67c3736b25aa0787aaabbe1fa5b47416be72ead90d5f3415294a047. 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/QM4TX2339955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945a51d09f2d4e4186b69776727ff6d901afdf3ca2612d58bb92e61dfe304be1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6N22339032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bccbda313bd27319d6afe5643186b67d266f5f7baa88714fef9f71294be7285. 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/QM6N22339040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2350d1ee657cddd41450273ad43ad1508847e2a1c3cd15492fb36bec24de27. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6N22339047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a6495d864b4f19bc259761eb11bc339354f1db55c8b5e9f8961cd7bdced540. 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/QM6N22339057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b893093dfa6412cdd8916f95c0230e5027b7d24e90e4e26c29f8914d111ae84. 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/QM6N22339136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc76a4eb469abbcf3d7adaa9b3336b24c05cd3ac537583c63f1d7a0f273537a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6N22339164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc4f26c737ff3ca30cf793f3394db59259f167517368bd416215a5b582df42b. 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/QM4TW2488574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c099f957309431f48c3479fd738ea6b22c9151e15433fa125003a69b4157886. 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/QM4TW2410551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16140438e60e18cd2164b9057ec1efbcbc3536b326170f4eefa6729960fc19f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM4TX2431889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0c3f9ac4f17c23b7153e881c2a54b303901be0d30cbe68786ced26da2674ee. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QM4TX2431868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b00bbaf486744c0d9f3eb20d0ac74215f4c20274d32e565dafc9ac97e827898. 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/GBKPL2168778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1377ed1fbae9c1006f8c4f9ab49dfb3204061b8724befde1e4c5a462794a8b. 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/GBKPL2168944.