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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 0x4b0d4f0f7e296a1aa79f686397fddb906f20433a9974b379096dda5d2b651ef7. 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/91d7a596-fed5-4eb7-9b4b-5a6aa247a54e.json and https://artists.proofprofile.net/proofs/artist/91d7a596-fed5-4eb7-9b4b-5a6aa247a54e.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 0x0e98ceeae84c0e21bff2c4dc3de04c2ee511181b1d1c3d5d9fb8ec2c0701c4d0. 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/USHM20950826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595b5dc61c838c3ce8b6d623ffcd54683aa777a3f5713e0f1f128dbe4578f4c3. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:30:00Z), 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/USHM20950827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b7727f9ef4aa6e40234c1d54395894442ba3f875ac68ce24201cd10b57f2fe. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USHM20950828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b02c73684fe30d3924d1875f2cd1b74dd5a2147d987c156d797340651c3489. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USHM20950829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179571eb807821619ba9372cf34f488394c49f90e2f5f4846c853c5556008807. 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/USHM20950830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f946bb948ff2d16cb5e1dd40cb19db32db9d60307536173da6eacc727adae0c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USHM20950832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db53f69bd82198c5e8aebf1ea3b669bc53eb1d90bdb44a8287e7ddffb7d2cd8. 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/USHM20952354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8302e2408bddbaa1290414b19d7f6f1ed03aef4f80511592fed5b1d8f77e2d12. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USHM20952355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574b44a77cb24b6beb19c45393b06899c4ce18c48174e42b22a9f90d08ce263c. 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/USHM20952356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c04d39802b6a4ad4d765d6e4e9771a0137d13a897ecdbc8e94d7c67c4a29649. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:33:34Z), 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/USHM20952357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8fc4b703274eba47475ca5e1342747ff33ddf39b2e5a77181e8e7261e9191f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USHM20952358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f6f2fb780f09ba90559258ac494b3abf30a6fefbb977f1559eae3b89f9554d. 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/USX9P0972868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b96a32d48cee50c577fb76cdbefa77a98dda18605c3bf6920f91d340fe89939. 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/USX9P0972869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58eb4dfca1c5b174510e4a338c24af68a54490648e86d0cef90ac048ce519fb. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:09:43Z), 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/USX9P0972870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4e61a4fad5d48a90535c61eaa98b7e0ef2193e5c0af0f721fc1f3c0a96fbad. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:44:45Z), 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/USX9P0972871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273d4449905c33aa8faadb7324e2f18e01138bbed77c3126adc18d7aebdc0369. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USX9P0972872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2b3bda72c7584c0aa7d387380a7ed97fa0f37c66797c1f2a25e0e63925dbba. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/FR1PP0800970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32808ae7e5b89abbd9358478eda7b4d5b102f82433cea7f283aab35a86ad149. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/FR1PP0800980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887754b89b06d7dde32301f36d9c944a61e20ae967902d246a4d872b23f0268c. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:32:59Z), 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/FR1PP0800990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0f89bdc4b892683e2bf0e703720cd1fb9d87ab7d788f82c12487d4c7a4caf8. 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/FR1PP0801000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195a2890ba28455337d297e37a26062ce4bb8194f210a7a19afae27e4a0148a6. 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/FR1PP0801010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801a5aef7904b472097c2cdbe811a099fd44c587b4878a2e62a934345dd156c7. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:29:49Z), 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/FR1PP0801050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b06f2c312c66658374e74dfbadf39462c30ff830124bef8914d510d2745f38a. 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/FR9W11705316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c1df31376fa92e2ff45e7a154ccc7000a6d3126382b6d50ba73c87abde8f1c. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FR9W11705317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c72ee9dd8e9f8f62d173c7bda548f62f953c45e638d97317fe3d1f051eaba84. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/FR9W11623036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf772a6cb3f6e6afbca58835a5860b3cf0046a2e87d2031d304c7255a947b3994. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T22:37:56Z), 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/FR9W11705319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79410a9ade4f9c21538ee516e3a8bbb319eaa62dcf8e4f5529a59787668d4f80. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:47:38Z), 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/FR9W11705322.