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 0x695cfd8bf5e670f68f4e858c229e94950262561e29d766b4a6661d17c4df1f22. 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/44ffba16-78cd-4839-8299-686c52d01bc8.json and https://artists.proofprofile.net/proofs/artist/44ffba16-78cd-4839-8299-686c52d01bc8.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 0x378c772357ddadf1401832688d66978a1d5e6dc06b66ddb75fcca39984703dbc. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/GX8LD2287469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f2c6b3d3c99e483e922bca2ec07c076877be357b53392b60e20b12d63f8f40. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/GX8LE2269788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ac88455d1ccf7c066a8abb21766af844d5311e2027af96a285d2de113aab62. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GX8LE2293975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc98e8ce244a1f82f162f02f54095581a01b21ab358c0cff73e8c4d5868429a. 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/GX8LE2207986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24be89a31d7c86ba8b68ebf908da7262bdf5c0f0af0acf39c0b885bca834b0da. 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/GX8LE2292252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2246ce064ff44115023f210d6ae7a78e12765b0ad11431ae48147b01b58bcf96. 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/GX8LE2205107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd59742c8f6d926987ab689befb7a86a86ba396733a8781e3d9f1c3e906c685. 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/GX8LE2247622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3715881a1a3816af28301434446cca40c7795002d7a13470b54c6757e590d0c5. 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/GX8LE2221751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7262b0bbd96b9ef3983fae5334f24c993b97734b5917b4afdf5cfbca90793c63. 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/GX89G2378609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5927a867eb55e44cf79c15701cb996fba4c603440e20cafa08a23778e3edca1d. 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/GX89G2394751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8de98e26ce50465eed9686c4c70eb049044e819c5b790d5ed5e9d41f22d8fec. 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/GX89G2353755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b525da2fcab830630145fd3e2f1a07795a8af4aa150db5341f8978962468311. 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/GX89G2396199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357b2f796f3e8f8c8e59bdfc7a1ba392a2d3b79d9507e3b443524a9a59d6f38e. 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/GX89G2323411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f073aa966301022914d6516fff3de1749f5ddfcf8472426d025f52f885b9e8. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/GX89G2304885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe06846478ffaf5d0b2037ea0274cc6a1fb2bab78a8cffd7629fa3564f25c33. 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/GX89G2370617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999f1c17117e6ce55c2cf19301838399a85c9e9413327ec254067963ded5ba37. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/GX89G2316377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395cc9095dfa79d87fe6ada0aa097f557c43697cdee1eb3bf12cbdebe9e9a906. 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/GX89G2360255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65626cf3bd476f5e781d72e5175b0d7a59388355e50b8c7efa21029525631c60. 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/GX89G2350527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa566f9e4e6309d2e707690bd44b006599eca529479650f086d8ba6f9e97dc553. 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/GX89G2301660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b9dbf8d8e6ebeb909e0ea2f4930f50636389a1358d4b71db607877f1e96b97. 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/GX89G2392709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17e4d3ab91ccb5da79c9fddf34b21811501da383883550bf358a65619eb2520. 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/GX89G2351861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe585c42ccd5918254d70a6fd4c93f0d08bb172ec83f4dd48ca88034a30f1ecff. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/GX89G2348645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a742a182a331a2c65f5412cc8c75b8d080f0977ba1486aeca53067b0a2962d. 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/GX89G2316286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20428d101081d363f95db0f37ddd719f98fcc8683ae8170501785768bc1dddef. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZTBB2460997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c087c98b5e16c414765bb18f76eb0987b3f016e9a373d9d56114cd6c44f723. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GX5MX2596812.