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 0xc0267a85ac58a44346bc15fdffa85f6bc1494fea0aecbbf347eb3909575081b3. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7e92449-b399-4262-af6f-4b64cffbc4cc.json and https://artists.proofprofile.net/proofs/artist/c7e92449-b399-4262-af6f-4b64cffbc4cc.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 0xa892c225117b87a4136a8dff7957541e905f0d1dbc3ed28b462e75525557215a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:18:22Z), 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/TCAEX2006705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa6f2e2c2d294036981c41abdf850b00bc4686cecfc9f1d7428d0a3ab681781. 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/TCAFE2033692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d498026d33f643e61b67aeffb55bb7d6f1ddb07f1bb3a080d20ab53dcfbf2ac. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAFE2033750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42780498a70161c06091326245d8a764b100f782cc5c16f580c369f4b690611. 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/TCAFE2033771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053979910270bda56e9e9d4616e678cc50e8ccea11336709c8f98fbe111ef7f3. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:17:03Z), 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/TCAFE2039875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f53f9926b866606198e5edad9e4c799c9c8187bfeac7b739375228c4354d75. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/TCAFE2039888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabebf928a6bedcc9db5856f00e6afa57e7835f3f72611d007b3f464d2ded90a6. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAFE2039898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4224382211aaf5453d8f9c17fdc9ad70d48f2cadbf3f093f4925aa01ab4415c4. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T05:24:05Z), 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/TCAFE2094290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabc6a95586636c99e8ee1186b8c673e24199fcf7dd59fa2d4b257476f3c2f64. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAFM2159916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b291398973673c1775366ed1bbdefdc1caf8dea840bb02ed7a8284d7f697a7. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAFM2160026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79aaeb3a0cd305a2d07b958971f65218f4cfddd0098b1397be328da9170a16c7. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/TCAFM2160002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1348965ffc86951673a4c3ad55e6d1d228dca5dfd2a683202e9de8eb5ee90591. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAFM2160021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84586c657d92d51a27f39f6e9a547bb7f8b329ceee4d65f247fa5286f9518a8. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/TCAGC2260555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba8b8ced2f8bb98ce24a46ede47fac91feda2855cd42677559e14b5f1fc1b36. Chain 2 (Bitcoin): anchored in block 957536 (2026-07-11T07:16:23Z), 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/TCAGX2389866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6498d711d97c763f267a49f299a60c8b32260e5c2e0460c28cd38694b4c399. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAIN2409285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81989837da68dfe36972cb65f27a428c2354877a656362218451437a7e5fb407. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:03:24Z), 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/TCAIR2483413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34d4f8bff8f680bb79ce190b6c1a20f6a2645ecb2b30577f8033a6a83744156. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT6632531196.