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 0xf4631bdf9666c00573b5bc30c02d97eb75ed650056591d1cf1fe9c3b6af320d6. 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/e4f3c3ba-7a3e-47ef-b4a3-dee29edbabc7.json and https://artists.proofprofile.net/proofs/artist/e4f3c3ba-7a3e-47ef-b4a3-dee29edbabc7.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 0x5f295659edc2ddc59e29be5d37be7173fe8b6d04aa57d4f04647b26dedbef5b9. 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/DEQX21300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aac926b8d48d7b4fc16958b4a9c121e833613ce2a11b24836b5c8aa47ea4c29. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/DEQX21300061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf501759b4532a0b35d517744cb72741b2b3bbbb7585be203aa5fd83b71a71ffc. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/DEQX21300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37fcffefd13b91c9c43315c36a84e5ee5371024275333c256c109710ed0d1b6. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:20:16Z), 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/DEQX21300064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768c07c9de3fb27535e4acb9c73c74fc258b91dcceb894cec5d97660a8257558. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DEQX21300065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e79f531ea9a28f02cf7f4aade93b36247fa48509e11022dabcea9ffa664a323. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/DEQX21300067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604a47035cb1e4eff440c95d2b8df5684f87311c1a6d0dad0a672b89a5ab9f1f. 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/DEQX21200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd671ac0dc065d207104577ec21dd14d4dcb72d630353f80fccbf1c3305fa2cfe. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DEQX21200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8ad32056a677364284d14ce2439937dc7e80ef350bb918348c98a8ec06ca1d. 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/DEQX21200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9c2b7660ca5f0998c835621e0fa0b7586867f05440f19a3927148913459327. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/DEQX21200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a25fe70896027a43182279692f94655ba146e23a1497c1c6ccb98804d2db5f. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/DEQX21500099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22cb2d58f58c30c46d310360bebdce8ac67e1fbdc95a43fc9916bf341e849d8. 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/DEQX21500098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb633f2416bc36a421d262524f689b40a304c8fce27b83eac907725ea3bc7731c. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/DEQX21500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142da799301949f54dd38d04143a73af8744bad98078d6a5301ccc79389c3924. 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/DEQX21800134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02eb8ed70f9a4206fd486078db8bf7df88b793f908f7d044a584e681ad71360. 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/DEQX21800136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab99e10b2890b09cf26c46c081a6978eb8189e0501c26724419216e466dd21e. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:33:05Z), 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/DEQX21800137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ebe3aecb3f257a67ff5c068025cbe1629c847fa54fd6e3a32c380779b7439e. 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/DEQX22100141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fef54f39ccdef86d87def9639ab20628be16356d5cccbeaeabf2c6ddb22f466. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/DEQX22200165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e913a5c71de84df6ea64d3152937a051108d7829a465369902fc6529f3c563. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/DEQX22300168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22cdc0481db8da829df9716faf701dd53dc68f32b986a390eaa39a4d91bad62. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/DEQX22300169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c63040f3fe33f1dbc297187ae1652bc4688e23479d89904841ad7be27521146. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/DEQX22300170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4de8cbe1e491758cd0a095c62e25bba1fa089816fb9c978e0d2c7b8b52a2d9. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:10:16Z), 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/DEQX22300171.