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 0x49d8953c5bf932e1775ab8ac7490473a6153bbd5f845b2830fce5a47702a007f. 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/9ce220a2-9fcb-4bcc-b2df-63aca6d94b1d.json and https://artists.proofprofile.net/proofs/artist/9ce220a2-9fcb-4bcc-b2df-63aca6d94b1d.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 0x3f5ff43e8b00de821353be5e58983964748c0934837d40a4120fd8456f7ad585. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FRR640900024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c35f5e64c74a29dd62112cefdac121045be189519e236849e81f770102b7dd1. 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/FRR640900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09d2a93d473195c0f0910285b1e8ef4bf43acd20290bf6c2f3038ad768a8bdb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRR640900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cef83d32b5c187eb4c1723905718e7120325b15dcb5eddc4a4942c403bab794. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FRR640900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b8c579106379d1d246d25e3402f9699d941174af87f5711075a6ea65e8590f. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/FRR640900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c3bb1e1d4080af776ae09bd8699f02fc05d0c80ff7a5d367cb546f4d4a5658. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/FRR641500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ddd4a74de04178800022a885d9f304a47aaf6816531295534c2b8de6b3eeb4. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/FRR641500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c8248d38b2e30cb6879f7ad184758e8f62c62279be26cec3a1b8f179a5c54a. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FRR641500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22e584d93f5fd9028b294181d33b8e9c1c899807a707ce24558dbb254acfa8f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FRR641500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c3bb1e1d4080af776ae09bd8699f02fc05d0c80ff7a5d367cb546f4d4a5658. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/FRR641500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ddd4a74de04178800022a885d9f304a47aaf6816531295534c2b8de6b3eeb4. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/FRR641500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d676e95d82c079ed2f790242ff99ab989bcc0d0b5c3567ff61148debbf86418. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FRR641500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa2ea0244e3e99df14b7a395a6928ecfab2438309bfa2472e2cf7c58a4bd5bd. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/TCAJF2552189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd6fbfdb70f75ee31a648bf779c7141cc8fc73f69294c5381c0b3b0357a159c. 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/FRR640990038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd6fbfdb70f75ee31a648bf779c7141cc8fc73f69294c5381c0b3b0357a159c. 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/FRR640990038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9e190fe66b2b882b702a5cf8c011605b117f7909abcdc8b5e27eccd421a8f1. 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/FR0U30900003.