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 0x11946496409be5b954794610ba6a168310922bcfebe52b346dba18ed5bc89376. 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/1089604f-0234-45f0-b906-56246df971d0.json and https://artists.proofprofile.net/proofs/artist/1089604f-0234-45f0-b906-56246df971d0.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 0x5f47da2651e9604816ac138bfc92320740b287e74010aa9d3b5c39ae47ab1942. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZMEQ2599845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcae40290c2fdb15d0e5bc5bd2ac31786fae8e8ce9d31f30fa22ea29ceb1b179. 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/QZTB22583272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79015ee8653ee8466f5bf32d667a842778c62477f4f59466eac4ef1869e8fffb. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTB32576929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc117780041435a790d26b7c575f8aec457c794908dcd35a9c28285ce5ef87b23. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZTB32576930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa486c7406935ca2e3e7fc97f1dec8c7d6975db655f106476cfe489144b978c63. 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/QZTB32576931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1e803d0c3c00e3faeb8649497993325533d325d6762e08f68f0271947adbb5. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTB32576932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddc050a490f1aadaeb04cdbd382f2c58d7acc2a1171b735142ecb77af10188e. 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/QZTB32576933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b7496d5ac1fe315eab7218d9d2736578660c4ec01913aa49d49992edea04f2. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZTB32576934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc3a297b5de3616df43ddf38252eb665ebe443f01ce3f6a8fab238c111408b1. 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/QZTB32576935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905d65db816dde700d594dab07e6787b5bf3562a024edc8bf481af9087a0f9e5. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTB32576936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbe3c131a24eb4dfe210f283a9d8d5f6135b26299737ef71315338b0d3b8b80. 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/QZTB32576937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18833e9cde683142d84abee18bbcd02dc186db3c8feee81cf03357293c5ca7f7. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZZ7Q2510853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707deda9ba8cda52693bfb84a4cce3abcafc3ee50d42c5e0508c4a2075131a72. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZZ7R2569209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3944cb14c3f1a7cd67af950fb0f04df6ab283261b9ac821155c3f36cc933c64. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7R2524854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0cb408c477306ae7e554bb7dfb6c23d58fd9894d6bcc654a0aacd29e4b0bb1. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZZ7R2524855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d2be82aad86701eca3ec8ed2785678a5aed2b31efb3f0cf2f6a13da3aebc9c. 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/USL4Q2467810.