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 0x4af803f7834fc4b371423cb1037cdd1fe999924e1ad45f889f6b339523954b84. 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/b25aea69-904d-4676-a305-90b01d8cfa72.json and https://artists.proofprofile.net/proofs/artist/b25aea69-904d-4676-a305-90b01d8cfa72.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 0x0a95c071189d3c3c73e23c01185b3eed9b80136827b53ee521e9a527a8946972. 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/QMDA61319098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b3f85f21b595178ea216c7f3345703e1108081ae3f49887a1ccb9a87eaa8c1. 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/QMDA61319103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63133901d5cf444d9d50e9b6c7a51089355a8d402c175efd9a0a79d7372f849d. 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/QMDA61319108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9af9e6414068916b43b70684955074abe73732bb50f037a6d4c3e323117e90e. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QMDA61319109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10071f2ca90fdb93f3289971cc7900daed5c633021fb06be37ca39cb00e2b0ea. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/USHM22127308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237a9a494b7d273621cf2ac80f0e763114bde085d873b7d81873bd8d2600f3d8. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USHM22127312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfe59b67278c89995f9ba508ff71a53fb3892872a73beeef02ba911b2fa6540. 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/USCGH2220004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61a27641853d956f59bcfed49bb0e3ed28b107b1d2032b19a3aa60db0ea2688. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US6R21479868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd324ed3acbd156de06955a5646e6fc050a5437a5ab61b38d4db5a784cd19f6. 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/US6R21479865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0767fa5189cd8aeb93174fb680320398013ed3fe1a8682bce78125bd2907b30. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US6R21479856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd235d04088285cf10ed5da62c614839e5e8172d24fc764f240bb85ded85c67c0. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/US6R21479857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2895eb97e98c6992314c23fc5ad937d1c222f1a4a266d26411d94f7b74fdb75. 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/US6R21479866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88d84eaa5a83ebe2523f6e4a30564eefce8372edad3fa28113befedaa8ca80c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCACH1558338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1dc74210d5fe106f35ce3119835f1c3c2b27742d44f5f41e8f172f21c48d78. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM4TW1591034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d7cb0445dcf2e8dcf2e352fdb89d6efafad18e596eeb9aba8acbd0558246f0. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QM4TW1572012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5dd0ccfbfe9500b3b8e6b23ab921cad2dee91c8c1518dc63bc634733eafb0ac. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA61320464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45df8c46ec4c85336cfaa46fa9e0c8ebf1df802133fde8ec8d8ee237e4ebacb6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US6R21427409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b50bf850846b2d675860dd55e2e06390fb00d837a6cc4a909bd32aff463cca. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMDA61320493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af0f832184364eb066f82a6ef672f063c45c38000953188b2783ca61297e4c3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMDA61320418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce18d2b58a1c16843cee5b9a444540676f88c2a9fc8856535ae1753d091cfbd. 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/FR8GV2425380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7dbea9b8fa5cb84454ce8ce3307dcff5874269309e243ab1571f45e7077db0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA371024317.