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 0x842160f3708cb4299ec23c51829a52da5ec6e0898b5bb927bb382f1b4196732e. 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/0912d828-7b49-4526-a370-9610a9622a6b.json and https://artists.proofprofile.net/proofs/artist/0912d828-7b49-4526-a370-9610a9622a6b.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 0xfeb9427ca6f98967203050f09d9f0204ee5ed47d70aca246ecefc42061587163. 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/QZNJW2364567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae408179774241bd9b3eda0761fec492c90b7c4cd829b0fc3d8cdbbc23dde0f0. 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/QZNJZ2346420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbe552c0d932105cd613d433448160b350bfbe19b1d824e876566f3447d3603. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZNJZ2346421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d51bc653532b553d0fbbafb9bc8fb4cf7759f4ae955afaf253712a30626bfff. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZNJX2363942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2cf1fa0e5d528caf3c8923eefbeb58ea0f03f4ee9644cbe27157e38b73d807. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZW9N2243460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5d8cdd69b54442f555a8f0d10e1b09d7afefafeea6fe07b43af31b4355feb1. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNJZ2346422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17838ca16a3a8c720ec9f32ced4f487b4d62c78d382a7047a6a9b4c4f13f969. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZW9M2276980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5408cd6c916ac2ef4dcb9dd097681a883505cb01b07b76a67ddc6ac708645e7. 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/QZNJZ2346423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a294a78490c67c8b34250bff5f02c6f685abb8168a2572d0044a39bc13c3ffb. 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/QZGLM2333486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef9333e38e4ebdea4d89e4d28b34c281663498104262abef032e34939060f64. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZGLS2308280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794c64f1b1a0aaad19b64cf35d1274548a2632c1cb628b82d63b0563327c4388. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNJZ2346424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179f414468675000f41c9eb75b74af141c67ed832abba21e44034994243abf7e. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/US7VG2486236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbe552c0d932105cd613d433448160b350bfbe19b1d824e876566f3447d3603. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZNJZ2346421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17838ca16a3a8c720ec9f32ced4f487b4d62c78d382a7047a6a9b4c4f13f969. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZW9M2276980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a294a78490c67c8b34250bff5f02c6f685abb8168a2572d0044a39bc13c3ffb. 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/QZGLM2333486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced68eedb63f8ed2d4b0f17918b9381c04c1544b2fda47bf5dd21731fbca69ea. 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/US7VG2486237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a603a46b9752e67cf52271a15e523c0bfa8f3aae1b401564b84fcf20f359500. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZW9K2359889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961094cdcb672f6e0b9e6811f1b9d58766eb3b73f66a2eeb39e2d1b2c3bec50f. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZNJZ2346425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6f803b7d569c8f17dd77cb409a112a515872dda4754d58e777dbd09f598ff6. 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/US7VG2486238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ea50e6d0348bdad737b9863e038e4412103c82d5626a52dcba7b843ac8f9dc. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZW9K2492140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94680ecb1dfe84ff0dc5a3636167b38497a5c6fd70c4851b2a1352ccac739fe9. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZNJW2424212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487e102b9c212ce643d3987e909d06c74f32de6b8c5a8c86ab0a9c0b36d0e2f8. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZW9K2492141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad5d08c7dcdc278c912b1a9deaa582f32ffe5a975033270d4c66c6707c32858. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZW9K2450871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f94fc05eb9444858c0fc1c7f98689fe574e38fe1451e26466b47d289c2c543c. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZW9K2492142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae35d831950c42389ef422690080ee818344016d745cf898cb91bbfa3d726ed8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZW9K2492143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88227435f11d8473b828ba6c6f7c8f11ae7bdaa546487e1ce22d9389a5f5abe3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ARF102400285.