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 0x5cecaa9263e496d0846d29b3a9d7c656f46baf8e856930a2f6ea773cc9c0fbeb. 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/1ad24a8d-2d70-4e41-9198-42992e748a56.json and https://artists.proofprofile.net/proofs/artist/1ad24a8d-2d70-4e41-9198-42992e748a56.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 0xa7d591a0b83d0fb5c0f81ab94575fc003566fc8b34103ae514af96121f4c88b2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1917240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b156b9847d3b1ed4cefee7c4ed5006624e7a1cf92bb168e0c023b2ffdb76b3c. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X41974584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63c811b48ac3c0acd29ddabbcd55c9243e13c12eb4af02bc3b209d3ac92828e. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2V71900104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d1c36197a558c7e09aee9efb8c3d0f76097e0edfaf1684294d0f9a30295ac6. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FR2V71900103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b8e4e86f749af249238a886274ccc089c739209ce749a1749b1e936b057526. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR2V71900107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6621cdc52527c47bef5f4a4ec103fa143f5e6587264a7e602666311fa76940. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2V71900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33c4ac3e5b6f2a598f034b41cf6e35aa326432b78f543bcf3cf9c2f6386ce5f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2V71900111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0388cd6c953a64d6824272d28463b2f8c7066be4a6e7a6051bf546eadb1ea56. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2V71900112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892024e4e33b270e81fdcf0021d435e8c369fff75f0a9083abda9c906eaf3726. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2V71900113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f9ce81cb55ee1e5b793a15fae1a123aa6b622901ebf22bd0e6e7ba591a2ca2. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2V71900115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc299f1f253b5b8a0877d6cec9a9cf95ec92eebce6842e88160191ab182d0c4ac. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2V72100501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345e2a6f82a62e12a1d2fa02c1497677cf593270a95d27ea19152d1dbfd12a36. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X42219536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47009156de45bd5a8f1f34f81954b2bfee715482164558d5d156674df39a264a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6I32423523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e97235003e03cc91123eab655c710a48ed0ba2092da021d6a75d36b5a2f53b8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6QE2443411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2167e3476f8106f15d9b0b6d74f22676381805c7bc6cd2c57e215313bdce6a. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/SE5BU2540142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1f306771fc42a138f0be808e88eafec2719855bc6f46e22d1e9905c2d3dafb. 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/FR8Y72100277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f386ff00192d613e69efe1330e990a9114e4f858d94bb5abb538f76689016e. 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/FR8Y72100502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5090cb9e0b849c1f19b02cfe752408d6ffbc0358d6c2203cb659181d29f4a8. 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/FR10S2301461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ba2cbd6977dc82e0364a7c812a42baf146ff81c53099cd9b0b37fd36d5dbc4. 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/FRX762125256.