thumb|Double T The Double T is a logo that is the most readily identified symbol of Texas Tech University. History thumb|Original version of the Double T The Double T is generally attributed to Texa
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf418b5757e60e67e56abb7c7078309c95daedc98d3df6670926ca80d1804f26d. 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/8d37a9f2-26c8-4c67-9660-2f32bedce5e6.json and https://artists.proofprofile.net/proofs/artist/8d37a9f2-26c8-4c67-9660-2f32bedce5e6.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9246f030eae5a62053fcb8ce9ac7c41184c84e4a2d0a87a0d9df8a946d45c00. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZAKB2436550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8925591efb12dde3428df5d22494358ff484dfa917350d2ba227843c2c5e3e53. 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/QZAKB2402580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a53c1a5b9fb3feac8c018d3c3f2ffd9ae43b8f94ff1f2db596663a3565eb58. 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/QZAKB2410692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e043544f17fd3a8eea563693197e4be6a8e9bb03795c41bde15b0662ba5db27. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DETO42436240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e211f9e621c38575da94246694e99cc8cc9770ce11970557c9bf04ce9e9cfe. 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/QZAKB2359700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20135e16fb0db9d2f41dacfdf70ab705c1eff3af76e5444d5e61079e7cff7e08. 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/QZAKB2358437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ac8ff4dbae27bfe966dd7a7565a80676988971e240e8f8afd4013452b3b34b. 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/QZAKB2358103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d61c7142c5e2dffaef0d7202d5f70c15ce44b7cd54b612d055106a3f40be64a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZAKB2357056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7413c4df3c856930d64829263027f3b62c6100e51189647d7470929a7d39e37f. 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/QZAKB2356959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86f66f5ddc1506d1cad215253eddd6300e19b0755f1cb278e529094209abb12. 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/QZAKB2356273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80518304916d398f43a1357ccba3f538772de9133a23f522913fba635388f571. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZAKB2355997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb6c847d95d10e317cf1b6e23d5ea8a07a8804d03aa6016abc36042e50d4587. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZAKB2354951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765a85530b9f39dbba0b131cf3dd75628736998c6f0fa2381689c6236d0a0230. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZAKB2354034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf33ce46a543609d31ad6e3f1479b19ef0d4eba8f77d8101c8635e1df6ac67d1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZAKB2351014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83bc5ed692df8e26420882b7789f755f9b0597bcffb334d3d0ae0b7e882a4cd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZAKB2338919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffcfc04ebe87895ec5f5b4546e831c553b7fcf7c28e24fa09d5b7f2e9bca4e9. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZAKB2336865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfe38ca404e748e800fad9fc111a8eca26acdc9af9b9d1851f6f205f258a99e. 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/QZAKB2430018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c4a154013de452b9045f39afb971209de28a6faac711093ca952e3302dfe14. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZAKB2473653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc2cfbd897a1db3e15cfab2a557e3c9ee5cab84149f1beade3131b8fdb1dfec. 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/QZAKB2435465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd04e65e861a74dc42af826ee883c45481a4f5d13743f467af40ed62e1c868e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZAKB2408360.
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