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 0x2d55aadb392352ba46bf37bfa8d7039a9cf69a221baa1d9dafeb8f2880e17059. 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/75dc1e91-bdce-47f1-8fce-778541f28854.json and https://artists.proofprofile.net/proofs/artist/75dc1e91-bdce-47f1-8fce-778541f28854.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 0xc0dbd4424dd4460dcc28b98adf858b6716d2f44a12b9505f1f6976916d5b61f9. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/COF010602401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3505393c6c575025acc2d7d3b4da5e1c66cff8644cf9a3916fe5cc1df6b3bf. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/COF010602397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5832c714211209c8f949193fd2f30d0dd5a9bee79ede71dee717c8651058da0. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/COF010602398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c90c50ac5539c7a09e9cf86d91dc01857e25b2c2ae4e5dbd2f9d460077307d3. 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/COF010602400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b78280131083ddfa8f302f1ac5252ab766432b04add24c85c5017eccd697044. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/COF010602404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363b0a527e79c6903777f303e1ee693b76866026de0652f500455e09617702b8. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/MX5051500566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2675ab3568473f7de3a73a72348e0a1a9ec1677a9eb0b7624a742e6d36c05c77. 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/MX5051500573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7760fdd312a8c7e8b1b591bf963cb62743ecfaaf1f75b06a5e7639867d5079. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZ5AB1824778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7baab36b80a21647e2994fffd1600fdb60ff98465ff02d9902ed9b983de231. 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/QZ5AB1824780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2bdc59df16c1cc4c11d5bfb89f9dfa24ef91ab9c666c4debf6f36b6a40278e. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZ5AB1824782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f72dc55dfb9055146647e5265915214acf309218d19016380a28234974216d. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZ5AB1824783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca5c122b5c6e826b2a35980c92ddf935f82a661170b8d0ac57acc896fc08bd1. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZ5AB1824784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb65a996d249a69b35e2f2aa043951499bea786ce184a46bd85d1585142c187fd. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZ5AB1824789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497d1488706f79bed1366816e9aa3057817c905a1f510299512daddc7dae5a89. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZ5AB1824799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a101fa3de756b7d8a0b633771c9b0b0a0e14551d34ca588578abba99a84cde6. 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/QZ5AB1824804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3856a7b8dce24a30bf3bdb8e933a7e22dd18a2a0ab312c06ebecc4a17a5f7d0d. 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/QZ5AB1825646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e549e7f0b81334c73219aa418f228b49fa9b56ae3dd466517015549d50b979. 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/QZ5AB1825652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4e28a3463ea9db9aa4fa1ad83969ee2e42b373cc4d8278b1fbf2023b1a4ff1. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZ5AB1825653.