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 0xfba97424f6e105c8f2b3cff0cdefbda2acf5131a95fd11572f1c162778d2c050. 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/d6486cad-6e8a-4617-9958-7821f0a04fb2.json and https://artists.proofprofile.net/proofs/artist/d6486cad-6e8a-4617-9958-7821f0a04fb2.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 0xc36254648eebe13852242b55ffda8aee1aff0f5c337788f43d2c4a0c71ad422e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ARF049700628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf391a3dd207419345afb594cd6b1895c700388d6bc56c482356553a2fb86772c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ARF049700621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0fdee101655311e0e0aac842f47b8e5dc2b37203b1694d9d94b9074ae048c0. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/ARF048300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b8a6a66fdf52353b734a5901329a5819f5bdbcbc8a2cb6c79d1f8892a3ac1d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/AR8L71500610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecf881eb968263a882fe85567d94111dfdc9a00e93b5069450498be29cc62bd. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/AR8L71500611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1aff4439b8a4a6223c49dd458ac84e1685ff1cf24b3246eb8e21c6c816f57ec. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/AR8L71500617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5df2e5bf2cd183c5e8e888875282469dbd5354ffa27c82388912f99970c078f. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/AR8L71500618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf556a7bd0c5efc8a211224d84e5676a36294a5ee50791953c97c765827a84c8f. 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/AR8L71500620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf08d1ae80450b29b27f02864e05c5475920a1658f3757fe76c319c54b8ce63. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/AR8L71500532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2734f2e77d415f4c29937f9afc8d43dd3069258136857eba853c4e245363a5bc. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/AR8L71500533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d29ca4efac0559116a0298cff846b365058b1dfc59478059b852a4bd8ff3a5. 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/AR8L71500540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a84bbf5193fcc726b6ecd056a6742d3f37bdb6515b78e49b809e8253c53ff4. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/ARD2U1200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05d4d6c33a5fe002fac8efdbf9afe3911556fe4cc3e9997c0a98c9f2f337c46. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ARD2U1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5caf8a83e119b8acae83ddf9d2c8cb1717b81d1a92ab789f7d2739949c0c07. 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/ARD2U1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26d269cdc012c86ae1d7380cfc274ca5271145e26857d5f8a12796b8533d2ab. 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/ARD2U1200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd772f1f6adccd5a83c727e97371b45753f9c51c79baf38d6cf34b6224abf7a1a. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ARD2U1200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57c8281115c96ed8361b101b378b2990b43941999f3d8308181ec2e1d22bb37. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/ARD2U1200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea86dd1a61ffc01e0350571d4fddba8975a80565881479ae27e5664b54682f1. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/ARD2U1200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9b469aaf01cef32bfdb2029e2115b0266bbe3031de04f1995928c779208908. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ARD2U1200013.