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 0x71761d748c88b7cbf18b715896acb4941c777a77a81a8a6c8635cd628aaa1765. 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/02d1a326-afba-4946-8960-59bb3cbdc894.json and https://artists.proofprofile.net/proofs/artist/02d1a326-afba-4946-8960-59bb3cbdc894.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 0x470ceee9a4756a623bdf20939fc96e7e895c70c50e78af6a7f380c1df9ba0944. 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/QM2PV1853325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0bf996d44ba10d3e62f22d1df64515cb5bbc14dacebd436b973ea28a016816. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZFYZ2267541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ad56137a139ed0787cfdaed2bfb78caf2300a3ed5d3fa82bff2ed4854c2f65. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZK6N2206434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd311b2f1fa2664866c9f616d88f6a13ad43eba7d3cfd345b08b6c6b5f8bf45d9. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZNWV2295495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd311b2f1fa2664866c9f616d88f6a13ad43eba7d3cfd345b08b6c6b5f8bf45d9. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZNWV2295495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25341c04d2bcc713ceb5ec0ff7c998afb96b6b18091ce72e3e728576353e70a6. 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/QZDA62321031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25341c04d2bcc713ceb5ec0ff7c998afb96b6b18091ce72e3e728576353e70a6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA62321031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa794adb310ddd4faf0c188250820b737cff04467b5a94e4b40591950eb9839e7. 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/QZMEM2343466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d173f7fffc083ca93bbbab2381040a7fc89e42eac317421a47e7a93eafec4e2. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZFZ72488728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6037c48cfcff67565a0ffa2c7ead4999738ac89550c55cb98db903ebe40d7f. 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/QZPLR2495994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fa82992ce5249a9b1d445aacdc74f30a2f39ec8abe41d4573701b0e202c6f9. 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/QZPLR2495995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d432d0cd7efcb0edb06c771ffd5e502b522649a3499dc509919f33e037bf120. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZRP42402137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12e6fe09f82a6be5d7db02f67431ba946490177bfb513134ed43c6cde5e6b6f. 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/QZTAX2418899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87d2e630c91ac537f9e7b1fbd4977a3a3d33aee4cfddaba8ced6bcc69f1895b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZWFR2481035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf784d2d5ad5ce5281f97d02d6101788003b8ba2fde8cbfd05083eae8de226c. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZWFR2481037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5dd209ea74cd28a056806541b110507e9490527ce20684869384a45ea75e6d. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZVEM2569262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065834ad7df8777a420a9aacd335e1794979cf4e99a492b932c90cc22d334d8b. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QT4K52532274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5e948ad7cfe3bb8e71a572119e6026beca0eaf1e09297171f3e3aa2b130d1d. 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/QT4K42578482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67278efcf7c47b78b20023b30bd2842f9aaa32c2db957acc7f581e43071db4da. 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/TLVEM2400370.