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 0x2e57faf26bcec83791cfd23cdfbfa339b57975c382b4ccba9c887a1545ac2d88. 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/6c2672e0-dd34-4ed6-848b-168874508b4b.json and https://artists.proofprofile.net/proofs/artist/6c2672e0-dd34-4ed6-848b-168874508b4b.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 0x143d309476d088fbe5c02c53577e3c9116bd4462a66edaac31c48d0775f0489b. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES62091298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf237d76c26fa257baa369c72ac1ee65aef33395da7519f944b31a4b1899191. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZES62091300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405e67cb5e023baee097cc1a6cd90c2a4ef875c39684df67b9692311ce12c29c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZES62091303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463a566f00dd7666b3e63eadefc7aa15569006bbd481c2439b51d91225a83eb6. 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/QZDA72117607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282d45aa581b49c042800a75dcab20e0536fa16e54a0699f0fed28927fea1c3e. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZDA72117608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f8d9dd0c44a7f3318cf52439d9acdceb05e3fda54ac66bf1fd4cc2de00f161. 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/QZDA72117609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c999439837086fa509889bb8663d89e6cdf62a487e3d608bc668f8859429a8. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZDA72117610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b9260cec68ce4060819da2fde0ed8e6eecadc8dadd7daf7b9d15b2fa2e8660. 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/QZDA72117611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d657ed981e68cfbaa2b1f042a54be9abfb4e1b4f9f662d01b637998678bf34a. 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/QZNWZ2064600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c03174210be82c4df86760436d3e9d268f80dc81e4c92a5c0ca88c10a83ead4. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZFYY2289876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9977e41f66cd7793d81ebfd0c5767a76b8fefc742e8f795030e7101da7d93767. 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/QZFYY2289877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b1f23a8f83b08c7fa0c5ee4425e8f53fe7fb34dfcbec8001451e93c8a87a39. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZK6F2101352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f2c03dc0614a627ef31be2052cc303042b7b74c30b62d571277528cab54b3e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6H2229284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593582de9fcdf5f374972927d60133b0e478f7bfa08dd9a764a939e9bbe9f21b. 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/QZNWQ2260945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82161b82c817ff089867a0221e27d64792f3b00ca8cb7d34d9d67368915caafd. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZMEM2253781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9660119394953e818e24f3992cca33ff7cecd3da320b9d00c54a631553f30b8. 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/QZTB42365493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b9e1e2636321d767563af3c602db224c7f72b8f87b67beef6c506a7eca065c. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZWFP2304761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e94fa6ee361d317c13225f849bcdc435a87d13d29723c43bdccf74e00e0612c. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZTAS2429113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd620ccca8c792269ffd9d152e57a48389e8ffb9415ae64fa8e0483191dbc1e3b. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QT3F42421444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee34ad7a47561f121cb7f2a646516174fb92aa0b05533c115fe859ba9dcb6bb. 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/QT3F42421445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd5c2913bb458033687aad4e0d35cf4cbc6ffe09131edba1d80dc35ec468a72. 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/QT3F42421446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf51ce0185540aaae4336012596ef08b0505fd83756c108bae592975cb93b879. 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/QZZ7V2502577.