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 0xab0429cbfc22d089dbc5d0615eef5b2775d9e494335639dc53f3cbac4a3de1f9. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef848b7c-4b88-4e76-ae38-8fb49849dd5a.json and https://artists.proofprofile.net/proofs/artist/ef848b7c-4b88-4e76-ae38-8fb49849dd5a.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 0xbf1732a4f1b91b2e5eaebb0ecb843bd41c3e21879a54ba574925530ff0c9e864. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/RUA1H1512825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb286281af67b20f1b4ae8df1cdfcb5edce15bece1f558ab2ddf85df77bb59ce1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/RUA1H1512827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1354a61b2a01617a122caabc79776dfcb72bb3a4ed7adb581cc43327813b70. 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/RUA1H1512822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47cbd5065483b304747be62ddf3e6d7373c0b7b899fbe3bebaabc9451189259. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/RUA1H1512982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55283e291fa847518e4b26e464669f3dc2f14d15fa9a2cf9a5d4da2be477f97. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/RUA1H1512983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e62b4fac4e5de2492ef2791080bd9d90d808a82eec5565209619e40f0515876. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/RUA1H1512988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec78adfc59a04473f8629d2f424c23bd4e7f2542d8d92e91c8a8ca007ba23b54. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/RUA1H1512989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631412e6a7ab328ad4e3cdbd4c09647137cb02e1df490ab5b9df9221bc02ecd1. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/RUA1H1512987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c80848a626104f1b2ce97f5ef85e8e82f9e27a20a4d889aef3c6657bc21bec. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/RUA1H1512445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5d8d0e323fddf35b18ae5952f419c717124fb36f55ec0d664bd6f1bc9dc4a5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/RUA1H1512451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae877f2b93161703e7d479b98355048ef92f9f52f8af07eac2c98e232bc08048. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/RUA1H1512450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fd9a7b3ccea2bce75f38c64647251dd78d9f5559620b76be28512a598797a0. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/RUA1H1512449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd7918ee516b6705db80646fe6409eb69aec2568891fc272db59c445e721c1e. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/AEA0D1977100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930fb81d72a163972cb29fc4fad3c1f76f33805362b629257ebc1da34e5732d0. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/AEA0D1977101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb599c1d1d5692f7646c25be5f8a3b1b4c3a844a36431f13023f2228eb451277e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/AEA0D1977103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3de6963f8d53d5d83f4f75bce3f1078306f4d9a875a39594c2b71ac624136bf. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/AEA0D1977106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e22fd01407d12eaaaa550f6ec7209aafea419ad203f2fc082de1eb77ac0b1c. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/AEA0D1953539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500d81b17caa6d9b9ea06aee0532fcff51057b6b4a834280d11e1f18bd6c4216. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/AEA0D1953543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35031fd58e85b7b518d7eb5b63b14a878d3ba1d47f2a3fe9e3ff11b618b27d6. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/RUA1H2048442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea4e6d2f1da6430f443fd23e462864e63145f696937bd6f43940cf2b75c8070. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/RUA1H2048443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcef168ecd079572174645494d9798c5149038b962942294cdcc084e3ccc740f. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/RUA1H2048444.