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 0xdfbd509875010a2ee95fbe425afa97ee47ed7a2e87203cad1d5ddd6bf1fe4048. 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/6f6ea815-2e15-4c2f-8285-df62bd7f7e68.json and https://artists.proofprofile.net/proofs/artist/6f6ea815-2e15-4c2f-8285-df62bd7f7e68.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 0x522192c794512b8aa82d3390de9ea6893a071bac6fb798cdb9abae31f16570d2. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/MXF160100175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c146a89b8813f50b4515b1806a8b97f4b3427d11f83546b4c9ab682aa0868b. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/MXF160100176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d62257fa6187b7d8960e0768aa4e830dd2e0f95ad8f401694d253f792f6d3fa. 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/MXF160100177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f8bd3720dec1ab4b0e0345c01090f3ad65edfa3b8e121b7a5357d2a2275762. 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/MXF160100188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35190e908b294e03e700bbb8178f5e454efa6628bc8294779f7e421b9bb0f939. 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/MXF160100178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d920243762ffba6c3ff9d9d4f8959cc838a1bb62491f6136cc0666f03d11a4. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/MXF160100179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29574a05e2d37b6570c3a1468b2296d6e0db36c2ea3cb7b471e03ffdbc6ac6d3. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/MXF160100180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844a78e9a076aafcc803d2f597a9989617c97ce8e8c306d2b11018f5b90a1900. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/MXF160100187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579cadfea839b8cd0b2817dd053210ade4db90ce6e99ec9ce1378ceb8f4766e0. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/MXF160200064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77434ae7167ce3f85151b4b09929897dbf607073df095feff9762125d8fc19cd. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/MXF160205738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a4a1d62e9f25f2129133034ed39650b41b29773eddc212322e714d765e8db0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXF160205739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8bd25efe296b15c5e45eabb5834c6db7adcad556d78638d1271d6d3d24fcc1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/MXF160205740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5045fc6c23326a016decf020852cbaed838cd14ff4f2dca70611b8b7bd18e79. 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/MXF160205741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdac5e382cab88f4e7107be3a3c49d0a0c4a539214a852fe032b97e9def69c9. 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/MXF160205742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9900b6bd87f62de30b617a321f18d56f515aaa369e62bc769a0a0697e3776f2d. 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/MXF160205748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432b8f8eb2b95cfc7c94110c01b5bc7b63c949dda5005d99a227a0a8e153d423. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/COF019200096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2102c91ef77d101e5810e70aaa76ae1c7ea5bf877445c1f4496b4b2b38a7767b. 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/COF019200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ef1c19f36de392504fe031d5eb8bb8cb8dc7507bb3fe988ac3996c65ec41bf. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/COF019200089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ae1071736362f39c61df14bd91981c69e957f822abd29a81b65306c1433dbc. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/COF019200094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7848ca8efb88a66a5da98da6d1eb4f808d4f3ac14c315914c42212552991b3f. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/COF019200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93903d252fe0f93c610d5039539974d396a53706099ed79699676adb4c76a30. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/COF019200098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55892f7889b5f293094eccd0285ae9ed425043130411dae1acd4ec0ef4538d33. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/MXF160205848.