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 0x6f3a263450938c37bf7e9d3c9ab269ccbc0a5f2763c5e0592f4341616c441a1c. 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/e66f6d3f-81f1-4b85-8b55-1dabbf235a6b.json and https://artists.proofprofile.net/proofs/artist/e66f6d3f-81f1-4b85-8b55-1dabbf235a6b.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 0x0293924a88c59f7aee00f2fd026a76e448ecadf3e32a4ca4561ad08bc70c0345. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/CAHQJ2374135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe90960e4ebabd0c74c37ffae6d6ada404f787da8f61942bc6ed8cd8e9b0f85e. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/CAHQJ2374136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cf1d85d43be4996a8557e5b3d42c10b68400004d044d6b57449c5382738d33. 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/CAHQJ2374137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea90b7e870934757bbb21f3e7e4c561b25d09093eb150f2773555335e8209f71. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CAHQJ2374138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfecafa33e58105d50b3d90ce94a40393209cb4945f3d8540ef06cace4f2c0225. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/CAHQJ2374139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557f9192154f8a384f256c9a83f1f0e6d2cc3466c6f7006aad3933e4c4bcf2c3. 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/CAHQJ2374140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d65d99f20374638a3ecc57c1837a5432d7a7d7ea5f163b25478710ca2e5c5e7. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/CAHQJ2374141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138fdccd0f7ec16ebf3c5f93ab8e803c2963877ceabdd366710532e91bb1e4e9. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/CAHQJ2374142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f31401f979e0d5651b19b2a027350eee4f22ca0110c26fdf6ae456364ae60f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CAHQJ2374159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9bc76aaa1f7303a752d743a1748551db56228dd0f9d38da150149e941aa1c8. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CAHQJ2374144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac8cff81f9abd150b2efd277139c67faae5bc4b2149f8bfa04116fc82ff0eb4. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/CAHQJ2374145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ae39e989d77f623de9e4885410b657b0df55afc6fc807037fdfd186528c638. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CAHQJ2374147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6a07a9d08cacf3cac2faf78ce9d9336b7b7a2246a794b618272a954867d367. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/CAHQJ2374148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5598b88cd9fbb13dd3c7816b62b106752aaee164806b74a69a054803d53144ba. 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/CAHQJ2374151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba63def2d203c9b53bc79cbbdf2a3595a2fea34f82aabcd9793b74a06993979f. 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/CACWV2311929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa52a80b8e7093c22405d02f3290530bab2772ef5a96c42b77312f5b8125b005. 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/CACWV2311931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e0764d82e0fdf74fd428e1022d2938d778e5d32fef684ffd18d2af49b352f6. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/CACWV2311933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d41c7a663316050f3b159bd44ca13866ac231c3da75a0de5219bd8bf5abb74b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CACWV2311935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79fa52977227390cdee65b38e7555c5187100e4e8b49a4d0f8c2a0bbb4b66c0f. 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/CACWV2311936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bcf10f498a93c8eee9d7fe67033183835362d427d233876d5c1f03d7892ce01. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/CACWV2311939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6508e62216545d1e3ca47896654b7346c38d6ac033776f52d4e794edaa98b00. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/CACWV2311940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4415ca2e6b04a6ad3e56cdeff5a31efc5825b9b41b4b224bd19c15672b63bb. 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/CACWV2311941.