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 0x6a0e6878a66d14f1cfe86cfcc4385417de24158cf755f3fa1853166993ab790c. 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/7b17a942-88a3-4da7-8bdf-3e79b00ca06b.json and https://artists.proofprofile.net/proofs/artist/7b17a942-88a3-4da7-8bdf-3e79b00ca06b.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 0x4e77769468c1a92082a28e46b76b754d88d737c730a79a9d1bdea86a17ff6faf. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZS652493085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc92cb4a27024d77ef90afe6cc680912951eaf07ac59ae17815d1ad46c9e205d. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZS632541570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a5bdc11692736b87942c915d91909ed07a8f9427e1a91c1eac849289fb0a0f. 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/QZMHL2528922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04d30ec7a671ffe817f390d4e2a117876bacd573ebb408645be75fbfcf54db0. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/CBDRM2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bdbe7de07368f29c89cfc287abd6c0e3eb56a0df90ea74c7e4b6118ef7fc0db. 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/CBDRM2500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2348eecdb38642488bd6bc6d6e7c4f41949ddb3b874ffcaec3c4dae5cfe7f52. 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/CBDRM2500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa832a5c6fb7bb5fc6a2f2bdb38a8bd69cfafaad0d513c31c8eb0ef04ac559713. 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/CBDRM2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c9e66c2bb9e9f8fa24c12d269e2d9b716a4c20474d4c69c58ecc62301754ed. 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/QZNWR2594617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf49a6f55c3e6476b8705fee7ee1165c41a898b836b7e1d40ac90ad2404f27f4. 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/CBDRM2500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58850f2d77b7e5bd07546f1ece025f15a46afeddf0e6d8e547032ce6d23d728. 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/CBDRM2500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2d55e9ec55cb8522612022c4b2ae7cec095807300271c0a05c02c3c566ec32. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/CBDRM2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de3eb49932e005290293ca19796cd2b61f19e7d943d881dc135b54b1134a875. 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/CBDRM2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52406176a0f5c8f2ae17ec4edbe5d89a1234610658838348455a4643268b562e. 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/CBDRM2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc9add7e7664b7d1f88f766f0f5906751fd110f229654b4841522ff9fe46066. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CBDRM2500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03d81b82684c23ad56508cffeefeb8a12991f8d3a0f256044c870a203479152. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/CBDRM2500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb42cc54467587f2ad45d97707f2eabea59dcd36a95aac0e274b31cad1d7249. 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/CBDRM2500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c95404cc3f05239053f63b6ba7877e9b3b4cd551832da25f932965ab8e50a0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/CBDRM2500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021143af4e2757abfb43b887932fea1e881fb47fc908adf1d6f24a5aea457517. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CBDRM2500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de0d7b696c62a1a6e810c66f42321fec7c1716c260a552653ea7a526f02fa2f. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/CBDRM2500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a569836066eca6aa997c0368ae00a7b4526b371597f9b32733162c91e5315a. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/CBDRM2500041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8464e5beefa06f35bfa48d7d2218efe41afe2f5082e9f72478a8bcba585546. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/CBDRM2500039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81504673bd0ec8e15030aea8d2cf53dd388c01a5e7feab85e08f914b33bab4b7. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/CBDRM2500048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdecdaefcde83605d34a35e3ce57dbc5c0a16a4b326a2c1af4116dafe883d791. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/CBDRM2500043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc693669a2e2d968b7d89edb9dffcaeaa5f4bbd16680d0edf38b41f6861a3357. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/CBDRM2500042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe040af0b0516ab502ddd13a73848a20f017d004347ea1eb80c17903fd25f6b. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/CBDRM2500050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5ad5ad3d6dd9a799cc51e3ac1a6e3f9e1942622d474b06f5a33617d2c549ff. 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/CBDRM2500052.