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 0x4d9d2c8238afb0a047368a4f3dc47474eef86177337795a15231d2f02bc10080. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa0ebf40-f011-4fb2-9e43-f3928776f1ff.json and https://artists.proofprofile.net/proofs/artist/aa0ebf40-f011-4fb2-9e43-f3928776f1ff.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 0x4a513bddc2e67a69031f38ed329c9130ed7d005459426f8c125a6b0ac73e0f8a. 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/HKG732319529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dc0b98f60a8d11f75e704cbef0b5bfe4e208b006ffbe936907785ee3789c6d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKG732319530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b26cbb9b55de2f0f9cda21df9d4ba08bdf94af3e95a38b89569be8ed28762e. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732427112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc747400b868f7d40367e1cad1265c9d9dfa93732a2bf3bf78170e9194e214bd7. 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/HKG732429424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5bc06b6e494c5d91b89457cfd78de1292fb120fbf4e6dc29f3c601484f3240. 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/HKG732411425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ed0eee134d343e35f334a45e672dd83da777c51de72669e15d53cf778baf76. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/HKG732384610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf13aa6d10966378d93e2b0f5ec61971935bd668d12dab9c0150919b627c929a. 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/HKG732310192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7879ab69760c04ab6a2e2caf792aaf4d16a7bfd62d51b0d6bac1f7b5faab791a. 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/HKG732328218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8598fe74fb7158ee76be0e512c22af51bce93636f395d66b42e6a15ebe3aa57f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKG732328220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7887c6da127cac6efb9502e9212236d9e03234059c86c81d106b5e31abff5c3. 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/DGA082380648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6749c1ea3368f8035e5ac8fef0b24f71143a00a171163e733e6c36f9b965042. 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/DGA082380649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202cf0ebde848d28cb47e567f9865d504cc8ebbd3ab8991d8ee42c579d37e18c. 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/DGA082380650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45601cc45c2cf512a248841143c26d8667241176d3071975824f69130bec9c2. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA082380651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad29a11d16f4f7d05894966dc74c200e777e11e77a0cd89081ac47ae7a9d239. 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/DGA082380653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57c0de7293d922caefe386ee3cf0a9bfc2cbb30895f78b57b5f12023e94155b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA082380654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a252c48bad780ecd0d1a6810a13c266229ce8f1d62db93db59c72839cad33b5. 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/DGA082380655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe388904f0e5d5f4f1ce219ca07a77ea01ae8ad8f7d7bc99aa841e757c866c51f. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/DGA082380656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0fd775b36836337094f7ac32870718a2d55b82e2da883fc6172b73b97b278b8. 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/DGA082380657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd66e474848ee6c305f0d241ac9b0f9de600b3b37915515b33500eca33bbd6ad. 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/DGA082380658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ccad1ab612d4fc1d32f7261cc253a41b4bb6f5a529eb2aa8e3ddc431907a04. 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/DGA082380660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922d36b75297d1edda017f224018c9f271f9c80d72e66337828cf92ff563e684. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/DGA082380661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce2ccf09f58236f33df4583914476bf72b3bd99ddb9adf57920c439431d83d4. 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/DGA082380662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a5d34471468f19f065050428ac993ce40b2599ac25cf74248328261db87433. 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/DGA082380663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43282731bed8f0d76ab0842b02136499163a51e2902f1e3d735a7f605c7d294c. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA082380664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02618deb8d32795e042071757f1c909215adf8a03c813de9805ca31c2a43ab1. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/DGA082380665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8b3ecdc6950bfa8d000f2fd2afbd0d7b850e6e81ceb060ab5d15fc567052b4. 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/CNUM72400763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf979eba594f25eeff5bdbf3d28365c34c52c6421d62326bec3b21ea70e767d0e. 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/CNUM72400765.