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 0x2bc5e39172fe7fb2ac26d2b4d41d2b4f1b8d410a0282259ba07379dab49615a7. 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/f1a3d368-bdb4-46a2-8517-eeebb3f24a7e.json and https://artists.proofprofile.net/proofs/artist/f1a3d368-bdb4-46a2-8517-eeebb3f24a7e.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 0x33f5048177259c9357c3520a18cc5b287d4db5de3595359e6b486ab429b52284. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZTH92394131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3c6fd400740febb852f23dd28b9195ee9ae1b459c66a4efd4434f4dbf4d662. 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/QZTH92394135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba17f0ffa45eea7e6eec9cedef6910ce243f128dd50d3c9a03a6d9edcd9100f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTH92394143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a90009a75322fe65fb500edd84a070a99bfb729642d294def781ecb20a2f31. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FRDKW2311806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3da82faf2c98f82894945f4c83fed131e6052825fbdfe3479d140287f96c84. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRDKW2311823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c910596a543f65717015bda95c80c1af1af5899dfa5b592a4ba99e1e5822f7c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTH92340420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b6efa8d28d9926aa7b64a8a7706443e7f223623fed7b3e4df9e5aae0b5ff12. 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/FRDKW2311825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa278f1c012a1263df7f9c3d600cbd621204f74b9eade8817a9eabea0d0f60cad. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FRDKW2311829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ed6e3c76c1bf528467eeabfb969edea4fd909de9ce24a518b0a99e7df48b45. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/FRDKW2311832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f50e9a9fb81157efac160a2538e81a146c6bb36b77b8a4108ea6bfdbaaf6c1. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZS652391652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf579ec4dfe34d2a9c0d668a730e46a3de096f4202fe1027c10635c8277eacbe2. Chain 2 (Bitcoin): anchored in block 957529 (2026-07-11T06:30:13Z), 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/QZS652391668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7202570d0fe2cc9c9a7ff53d84f1396d6f865c92a228f11a05c53742300b88a. 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/FXR752502488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf579ec4dfe34d2a9c0d668a730e46a3de096f4202fe1027c10635c8277eacbe2. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/QZS652391668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe931686abb464083cad8672af5e0f435a37d8122475c372457a56ab53639c7ba. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/FXR752502489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa221b7908092531819d48088680b69ea95b9167a12f8b28489ce02ea31cc13e0. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/FXR752502490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f34a5066b8578491f7cd6d39d3221d2e60322a8a8f667c8564c3887198c5b67. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/FXR752503943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5389355b27361f760d9eb6a91578adaa29b069184dc5c3c7c6c342f2788b914. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZS672254756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e0fae967befc7e0be0013d80a40720f1b56a23d74d00322a8564a733e25cd2. 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/NLCK42236768.