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 0x9a5000917f935e363b1e856045ae5c27c546e32fb35f1e7a10c0c78083cf0bf6. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f498e6b-b67f-485c-a6e5-040d606f9730.json and https://artists.proofprofile.net/proofs/artist/4f498e6b-b67f-485c-a6e5-040d606f9730.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 0xa513accf5f808cd83e34cf96061bee2b2366bb181aa3278fa1c6cf8f11bae106. 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/SE6XY2236291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9a9d4c7dbe35744baf2b7b12ac574d6ea5bac9b064bba694e1a946e501be0d. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/TCAFZ2116536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc67902fbe4e8df18684c45d051513950b27d40e2936952afc1d66de18ffcf8. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/SE6XY2236290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf517ac866d0833d4e666343bbfc6110618fbda7a482173d3fba69d983c3a75. 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/SE6XY2236292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd33a59877c53cef5eef068a8a585acb2e927da55be2fa56f8449d9a6e8108b7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/SE6XY2234093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70bbe683391b1406d219acc78e82b58efd3debd6f7373d0a52bdc88f45f4b659. 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/SE6XY2236301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba1d12873163c473583ccac0a4f5d35346912acbab1c7e6b448bb0353d18fd2. 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/SE6XY2236295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bd365f4bbadf2cddd1ca7aec2aa49cdc4b54f6efc7f0562f46c54153c39840. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SE6XY2236294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac767f34bd92c8257afb66d09bf8ee90b93058793b13abae017e5af8a881d74. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAGD2295930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83f9e7a1c8f5768f543488ff429fd8c7f52f64f8ee891c422e5b3309b998c45. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SE6XY2236299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63affc1a98a7420480a37fe1f3ec9412eef0b9a1d6c9618a78a3036f811b2539. 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/SE6XY2236300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114762b35d357a4aee5b2883600b3e675f7bb60c982fd83fe6214aba1b134fc2. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/SE6XY2236298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c2e6e63c185531e044fa004cfdb00c0ab9549a57962a2c25e8620986899567. 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/TCAFY2155285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540be618c6f42b41dde4a455dcfb56590e94982dd159162aa621a8bf474dd000. 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/SE6XY2236293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0981822f381d18efe5729fef4e13e7858c9e0c2d3540b1a85b57885e0221e496. 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/TCAFS2180600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2f7204f91c1c41dad377597d3548ea2a449d0b00d20c8b47499978613c25be. 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/QZWFK2377921.