Tunnel vision is the loss of peripheral vision with retention of central vision, resulting in a constricted circular tunnel-like field of vision. Causes Tunnel vision can be caused by: Non-medica
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 0xc31325882b15a3da36fd3c1d3c4c58d11f4622ef86423d1918bd06b1896e4070. 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/08c00435-414d-4598-a30f-eb360fd059bf.json and https://artists.proofprofile.net/proofs/artist/08c00435-414d-4598-a30f-eb360fd059bf.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 0x5095bc73fce5b02513a5301060edbb9d8e788a822ae68b19a1837530590e76d7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USDY41536843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398ec2633452f90bd3bde3ad7651c9a5af055e296db3162312ca8039f7bb1a9b. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/USDY41536844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3403821d874f4176e3c1289e8d6e334d81da93c92c1e2e3dd8e009a7e0f286. 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/USDY41536846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd03d04379231ffbcef3d010fcab9adf2a85c12a21e3dc6c3f7ea6123d17e27f. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USDY41536850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d2465a62d3f9433ff8db2d5557ca0e87dab0a61a9a3c6790bd29e61852421c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USDY41536853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ae81dfaf98c5733e1e63a656aa6f31eda1425e3de35167c6b7bd0ad93e3b15. 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/USDY41536855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e992699873e7fc5c8b69a6f1f84abda8b47cd744c463691cb7880e5204fa46. 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/QMDA61818730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2fafc06269fbf978e2e26cc21c291aabddc78f71efa88a86e5a94853ea34f26. 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/QMDA61818732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4085ff7be818fc16bd23a1b6aceeeefd4b3aa520a47dc7a4afb963ca9130dc. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMDA61818735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573357224c9fb256eaa8598ac949d31d8f5069f9433c1dac64a4dec8e6d31cd3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4TX1938023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb01b279a35844dc5c85b323fda795675cefea77340329fb2c400d0658df8607. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QM4TX1938024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3500576bd6834856547e37a366bc9ad7b25bd0dc61b389182e6abd995fce41. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QM4TX1938046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd6ffa20663684876199c85172ce13cadcb92b9326f57067042eb284b0efe95. 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/QMFME2050690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec9e26c01cf622dc8e5d8822d7ca9c984ae094eb641bcf4396b1d7170bd27e3. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QMFME2050691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6472eedb031f0cf35a043c3c01b065ce12cb8b00231e5df9a84926946d6b85a7. 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/QMFME2050692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ed22cb98f442f6d20cc3afd5e6d72e613d4f6f849b13e0970d740d04f20f6a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMFME2050694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c63fffc2d3800888473d828064048a159ce8f700df738b607115623381c36a. 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/QMFME2050695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed689495a3aee9164c5bcae54a670f0403255bae7531e5935567cdfc7c8eba1f. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QMFME2050697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c42d1292c8d85e1af9f245f11a698c8126804be9da89675d13bb7a402620c1b. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QMFMF2310823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7a66385aefe9c47471e0f8f501941d33cff84c7875f7ecf9614f8fa8b80a84. 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/QMDA62489080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842112ff71ceb176f0fc3965333be06b9ac7a92ed35683112a455a19784dc446. 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/QZNWY2481289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cb8f1e3fa529f920ab54232b09f1d8f506c703e454aad1c0e8c6c2a9410042. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QM6MZ2089789.