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 0x671f72644d22537322434affe5e39dadb5417efe3d4ae721dc5d3a56faee0290. 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/ef89811b-3739-41af-b805-5457a6a1959a.json and https://artists.proofprofile.net/proofs/artist/ef89811b-3739-41af-b805-5457a6a1959a.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 0xfe84aa96868d4ace3a84f764dd0972e4f118713e70bd5fa6ba56bbfa48e2e7e3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR59R2369857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94e8832a0fca57d780a86434fa9d4a627ba759ede3754ccaee8eace6131e8ac. 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/FRX452306617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423a3f17b026fb3b74385770369bbb71a0961f96416d7b40f91db647e75aaf87. 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/FRX762334983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333e59964f8842240561abba6bf51a1a95d2a48a938c26a5f898763044f186d2. 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/DGA072316637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea9f210b53d155bbf2ef81f8f403c449c878efe1a9290afe990e57d635bcd5f. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/DGA0Q2325757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7cb54e372f5a6ff3366fa8042da1210bea5bea9718f36554dbfaa0362a729c. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/FR59R2421234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fbb3ca6ddf569993030ea67d75614a317796a4fc17a6bd2ba711583bf3c412. 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/DGA052445947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60863cf0eb713044cb08eda76ac3db1b6f3ad061ad25285433183043f278d49f. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DGA0P2402964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cc3d4b62c38b573a7c59b4fb7dbc41d816a3a5362b2355306716cb05f24347. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/DGA0R2407433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e93c121e989347e94c286461dd9cdfbb2e31b912b256f02f9dea41a85d2a2af. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/FR10S2523081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b99cbcd430984cc1067f76df7576b1cc22a8320c569763f139ad48f28ab77e. 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/FR59R2544391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82b67ddf576632478e81a231c5aa01e14fa23b314c65bc2c11c0991f32f471e. 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/FR59R2544392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34071fe1debf3150b28cfc9e8cf6b3f8a7e0dc0b362c68363fdb63d67756e841. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FR59R2540536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8accd73fbdb706fc216795e3cc7058a10c1b5071fea965fcd128daa6beafd21c. 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/FR59R2540537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a23456ee6a7cf9c1de640d1fd4bb6d5047d92d4095fa1cc3d584515bf48c2de. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FR59R2540538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7141b3702204c90670dedd1da5421e22c983aa68846685e9ab241eb1054da67f. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/FRX282584647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d7bdb90ebe76f818565088770e5028d6ff39b6cc2b8fd437b6b657afdb23f5. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/FRX452590605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd797a89b457b3c6cfaf830abf9c9b7f856f0d944e5294129cc946971fe481d. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/FRX872524034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54edd8e586102be1d56812b0939bc9cedda76d4e6fc9e84d6ddabcf8364fb9a. 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/FRX872524035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7b608d180720de39331aba304752c6621ccb8989a8d0cd2ad269993d75c78b. 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/DGA062599150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ff126d356c8d1c70e78cf2172d29e239ccad1a38469235eae1933c2e2f1e3f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR10S2599002.