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 0x2b45620a99d2d659fd11964ecf5424b45246bddc814668738e530ff610ebc1ed. 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/0a1db168-7a16-4c77-a9af-1729e50b9e5c.json and https://artists.proofprofile.net/proofs/artist/0a1db168-7a16-4c77-a9af-1729e50b9e5c.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 0x4d4da2c70dc1db9b56c0a24586b7b8a1c8418d733990571704e136021c4e4ac4. 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/TCAEC1912934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc68604e46518010b5b8f6209bc2d73189b56984b42068d8a0640d4fabce2aad. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAEH1988337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25ddc44c18f49f64999383d5d874f92715a46415002d0cc34072833941d66c1. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAEH1954453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413a62d45fd6076ccfea383994821e73308dd6e0813ec8dfc22449b4a06f82b4. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCAEH1954488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bfaf5a66e62bae991a8ff774fe9130836bdb34632d339e9a54e49e0c84f4e0. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/SE6SA2012110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88a9a23da294357fe31871d66d42bbf14bfe0b74605618bf80d1ddb18ccca61. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/SE6XX2152787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de4ec98a589a2e08cef3f95df7fa5f77efde31f272c77cd51f76a404790d0f9. 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/SE6QE2117184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95707a403a320dfad09f0034b4f6b972f664d2a3dab8e206dda91076f6d5f96d. 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/SE6HN2255496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c121665cb74310c24f9015b905ac025fa38a14261d04d9d8a391212712d535. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/SE5BU2327722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee78099c8331365762542b6edfb3a059e2670992421cb4787d1197c7afeca6f5. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/SE5BU2327725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f4fd2e77ab797cf14fa7f0260fe1bbd5c9ec2512389672fdbf80c33e893a67. 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/SE66N2277741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec192b36f1710add86c06803cfc73043f7b30c8ef8d0b532d1e69f200cc8dd0e. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/SE6HN2349199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd96aa8a875a614fed77fd4d0267c1dbc080ccd14eb794aaf58d2eab41ef70a. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/SE5752470775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078b0fec0fc932aa90b4135d7b8da9c06626a324f156f2b0352aa1e6ad547949. 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/SE5BU2543248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267b29dd9d5a14ad910fed9883c3bf19ce7559817150e810d0706e6b0963679d. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/SE6XX2549209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbf6fe9e3cc363514d42b010ab5b1d40811fd50c061744bffba2aab34b2ded7. 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/NOHLX2340080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262ae0abc7a74e2aba48d6133d65b687348071edca6ef9b75f05e037b0535879. 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/QM4TW2455533.