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 0x4ddc3ea5e73e24160c686fafac781741408f42a871430180e710768d60b8185f. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a25c34f-5f40-4c7b-8fb4-d73a8b22e8e3.json and https://artists.proofprofile.net/proofs/artist/8a25c34f-5f40-4c7b-8fb4-d73a8b22e8e3.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 0x66ff3725b6c0773181ea52d58debe051cb1d0bc0d7ce1423339edc7f05af3a77. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ES8480800405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4abe34442894a53ca3bf8a25e77ea1af4ccc0ce63107b6409f16c113ca8f8530. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ES8480800407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd781ca7ef5463a6f07ad5041a7b220132707492ca5f3f2e1f7ba470aece19dd. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ES8480800410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df2b73553fcc565451551d6847ba5b5c4b55653202268d961473b08063a8820. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES8480800414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1dd6b8c57424bbca4400be546d96d64835d9806ff258b05419ed45c7271400. 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/ES8480800424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54719065f1fd586614bb0856befff90c100bdec8cffa6ade11a68d848f7304a. 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/ES8480800427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796f5e0b52a693b361d5fe508a9f38c3b0338fd1ff7d67836f8de11b5618fe3d. 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/ES8480800429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124f878d3fd207b84b998ef7f282c9592758f010729f4b48230c29b0358e3d0e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES8480800430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbadc6d995654d576b24a2179e26c0ca7f1fe2fad20aa017e698c0872f00729. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/ES8480800432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09333ab0725084de2b2b493f70ae16f2f50c6c1874994e7db3f8af29ac6fb72c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES8480800433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1b0e18198eaf604cef5bac0a995308b2572eea6bf53a6fedb2379cb8739cf5. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES8480800434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa040c16ba6cd3c08705e470c97a51b571947e5e7df7d6e8cdb4fd277a12f227. 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/ES8480800389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01882402739e92a386dc894397f09df3ac357834f09b230c8c847fc5af7cb1e7. 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/ES8480800390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98debf15066e4fe6f9af2a8cc34d5de82723440f0ef59f2a7091607bc01957e. 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/ES8480800395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14192dd6d075630cc04f6754667ddf5e92f2786b83ee7eec15c3128c290e93ee. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES8480800397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd756fc9390ebfa3c0e611d365092675ba1fa249469167dfca84574ba6be69c98. 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/ES8480800404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1717c18d55989f518d16fd0bf837ed37578bb4e1009234bcf1adc6c7672ca5d. 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/ES8480800372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b3763038928d406292b5526fbe3201833e4bebafb7f12a6f60dbaf64fa66e4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ES8480800373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a18f66ab7c92e40d77e5f3328fa0eff9d3c2ece87e1a8d7af0f47e7bfa664c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES8480800375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4169042eccaa9baf76f1e1aa5453adf3f413766e6c0b4245c1799c590286bf1. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES8480800376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483004c25ec1a0ad6acba742e0d83eefc8899ee562752e44f29d75593ec00899. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ES8480800380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852e2526d0171cbf4de39e3030ed30c4e589d0e6ce08ec57b2cc4201ec11ef72. 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/ES8480800381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9912a3c0b75e3c0ab5cf36755006c90ff6dc0cc6490260a3462cd22790a69c5. 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/ES8480800382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a540234255973999587cfc3d26a4051d97418a81bba4de93fd2296849e392a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES8480800385.