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 0x460f1f968e63fa0ad2b4385e8a986b13489b8eea29b6a850e112b379a136e9e5. 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/d04f89a3-6b47-44e2-893e-cb3595994c1f.json and https://artists.proofprofile.net/proofs/artist/d04f89a3-6b47-44e2-893e-cb3595994c1f.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 0x026feb5f245d3ab371f300fac7cfb83ce1946d1eedabc7ba0fd468cc776e462a. 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/IL1067400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817caa0e07f616b108dca5b5c389e0edc08021ca9b449b62244bada1a6517c09. 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/IL1067400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8acbe73c847a4f73c8d1359c47d8627584286e20f89fc0cc00f3125df25be8e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/IL1067400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b123c71ba5eed71b973d2b50feb09458fd3d6355a4554c8ee41a1a3792f016. 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/IL1067400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6c60e0f7369db7fb881e1f78cbeef1448534944b90a95cb7757a9ab32665ae. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/IL1067400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685a751d15ac4bd4bc8c46fcb8fe39c82920f3d204930b423f205f911a95d4ca. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/IL1067400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2fc22724b65dcec2bd90a17b8e1dc1a5ec753fe2fb46cf3dd5cb63605dc6924. 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/IL1067400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343cbfc6d81d7705323131ed31afb9d0904f11ab3c0089989dc62a04bdf257e0. 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/IL1067400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1ee0059e34fb96b86959db2bab1534e6aade2e2a06ceb2f245261415a7af1c. 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/IL1067400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b31209d4c1b24a2370f6604df9cca626473a9ba84807527ca98dd1abe785e55. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/IL1067400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b63cd3a58da13ef3feaceeb152e931f8fad7ff80e48a6bbca650916b982b030. 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/IL1067400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd0243c2403eb4f05ff6bafb292df9d93362f4ff2c68552b31623d9293e54f9. 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/IL1067400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489cb241cf4e15c4bdab946d3cd61ff38669a58844386acade3520195c968661. 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/IL1010005037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3ce1d7f2a29cdb15e8f657ccb0911523d3e1fc3cbd7efe299023ccdf62f9f5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/IL1000002547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdad30e640e301c514e707bbf30679e5849072a280856eefe8df62c8b43a7de. 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/IL1000002550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f016d3fcd3ade050b96b23529ef6948bca61e12a6b86b74563e5b1ce57a71e3. 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/IL1000002553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7520b7b924918fff1af9990dd5843738f224c731f7afd552a75d938f62d0801. 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/IL1000002549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d9673679ce5742d370a799a17b5993df899a83fd6068aa56415694cff942c1. 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/IL1000002548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf853211339ef848a316efde4191b42f6b533e0332451fa83482f13bef6e6d3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/IL1000002544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72e4693945bc0e884fcd5e3ca53ef4443dc32656da123842dc1c43a77bf4623. 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/IL1000002552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae982e73034398bb283d4f82f397f394f342220beb9f57c95f538fe9a5a43dc. 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/IL1000002545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc393fd7cc6607d057f6188f09c069e42c0d5b250eb5f510842e9c57f1dd447ef. 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/IL1000002554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad0015d8ac4a09510b03a46e135b876e1f11a2dac33f4652a13c92dcde747d3. 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/IL1000002551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afc8d2aab8ec5b8ee78775345e6e3c91c64f932a2205ae625ef5069f65e1e48. 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/IL1001800070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8a2e339bc93019490e75197b1d53df4a139db71d48871d84b011caa0f0d4e2. 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/IL1011902514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65af223d866a7dc8ebf93cea1089db45b510718844962d5c5b5616ca3b034e73. 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/IL1011902527.