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 0x77a0137e571983f259c4a4f5e4da6ee16664074842dc0900c2ca35f045f195ef. 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/bcc39486-a686-4fe6-bab2-34a9a558619e.json and https://artists.proofprofile.net/proofs/artist/bcc39486-a686-4fe6-bab2-34a9a558619e.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 0x1af8a7e114dabed1bffe3497220c3859746dec92c0847c7f13ea1678915951b3. 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/NLD231905091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08b4aef6f611ac3702fd1623b4cd0e2fa717e15bf34c915e0d877c901b21e7e. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/NLD231905093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c35e09938107c7592d41b2a1dafef9b42d7e5ac86302a795b46d722677e8089. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/TCAFK2131667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccbbbf65294b6f209bee5c7eae3d4058fd6874ae7efd66b123e92bd288f5105. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZRP42296974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fdb72cec942608322da98f74dc92b40da8c8400ae1183d56ce9a6039a38d2a. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZRP42296975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1212ab60644a187ed86d15ef0a6fd50696985b21c01b2ebd366a260fb7b2b9. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZES62308815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7841ba5d81c622badec23746e646cc541c2f47229bdc1c9f1a7b2c1ad318a84. 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/QZK6Q2461304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a44d389e3e29f679fd06f46a82493b764bb5450fb1aa9998583389f74a5190. 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/QZWFT2485722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfebf8eed436474309f79ea549677d5db23bee71353bd2904c31a1af56d0c42db. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZWFT2485724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fbffffb7bf89cbf9b4b794dc5352d477a69286646df4d2febf14e360a53e53. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZWFT2487455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875d847e56b422cff017d1e50e02e410f7c5d5e42e27e3ab67e9de0f39cff360. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZWFT2487458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4318c2b1e4e02f29a25a50b31762f49ba911939539406595072ffa5fe609e4fb. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/NLW2R1824212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ff725c18cb3ae97678ab86665bc2326225b1b26be3cd8d4452eaacc0f46438. 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/QZTBA2540284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf936545a19c1b1b74c1d33a366f44683e7e8fd15ab8ad919f3bb35810675e069. 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/QT3FC2500691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5776f523362e69aa2b567bafd7ed0ed568f107b4ec154a667d4897d39a3fe18. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/TCAFS2105451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801bc5ba0a5bf23c93744b6467d8afb2c7836394e3c90244ef9c0e03e624c1ef. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZTB52409076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc4b3c1a77d82d8349920da27e2cba013e881887bce828e29afbb7da123d504. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TCAHS2398525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e4e3b9197af0df0575583e817fbdd26a4b208c3ba75c848d39108b7c34472e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTB82409107.