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 0x4382e07f753fb7089bfbb1f5163397dddd02066439da7b09cdb5e6642b3e325e. 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/f87f8fbf-7bc3-482b-a828-c9a3e83f40da.json and https://artists.proofprofile.net/proofs/artist/f87f8fbf-7bc3-482b-a828-c9a3e83f40da.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 0x913cc36441ef625a99aaa4723106a26030382fe81533fe856ba92e297d4f28b9. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCACP1628421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408e439b763c074c2949d81a662328261f099fd0d4cf0682ebf112d49a14d382. 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/TCACP1628432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f7289f494da0a5b15d2bbaa6d4cb3afcbc32e02f0a9c27da9aeb2960848c9d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TCACP1628466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea53534e7ff312029e4d8b60063cfe5c81639d97a51fdeaabc32b26e4446861f. 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/TCACP1628467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34422e2b6b2602906e7598d02bef715b040aaba5ab2f97390f93f420a979fd04. 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/TCACP1628474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4df30c8b99d247462af820d8200e2233247560edc3934acdabbf1be68cba7be. 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/TCACP1628475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4f2a0fee90636bc446627f8feaaf21b369c4452f185e0bb8d340fd48d04669. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCACP1628491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b906a0f8b7d447abe4ea1aef698722997239c1102dbbbb02f33fef94ed8eec. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCACP1628494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433d6b4ab0d411dc100bc523ea7e7103cc762d7af6481a5c20f9117a2174abff. 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/TCACP1628497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x757e27130d9fb05e591322da5e44829808009a0ac05a97d16db7ad75c3b6601e. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCACP1628502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cde87c70e5e81c43b77f08d1784ee1be33bcca2ebfd231a389c54b05eb5ce5. 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/TCACP1628538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14abc6cd35fdbbef8a72ceadcf427a13ff5ee2e8cefe299d5ca86f7235cebd2d. 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/TCACP1628541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc52012ce29bbc8ed74e2f6b405c39c6c9fc447f837a2f0527eb2166087be6f. 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/TCACP1628542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bdd4d21a745122f3928e2fbccb0073eb9b0a021094d5d722441eebb11ca1e4. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/TCACP1628544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902bbc6aaa8a1bfccdcc5a99c4ab72d3eb44500574113995fc2c299a3f6a434d. 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/TCACP1628550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536abdecd29815c9ed83eea4fc041de9a502b9098537e4491228a733088e3749. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES64E2450160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d9fb4227097095f09fb4a53ab280af21d418d9adca1fcf57a51848f22c054e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES64E2450161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fbae7f6f7b29d30c4404a3e4dbee8cf3c5ff19f1bb9f0e0ee983246d72557d. 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/ES64E2450162.