Louis Nelson Katz (1897 in Pinsk, Russian Empire – 1973) was an American cardiologist. Katz has written more than 500 publications on hemodynamics, electrocardiography, hypertension, experimental athe
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0x13a537bcad62479287943ea75b78ad9282f2f1e69ef2b75656443368328df008. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4a56187-5f5a-41a0-9eee-cf114cef8fb2.json and https://artists.proofprofile.net/proofs/artist/f4a56187-5f5a-41a0-9eee-cf114cef8fb2.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 → block OTSBitcoinBlock must exist at that height 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 0x91f70f24bfbc90e0421a4f0c82faf7530035f82a9ff81c9f7c8eb524c772fcfa. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/US85P1112002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a97a8026c9a423f37ac8d9be2c697d9993932cddf6e1fb4bf09226b49cd2eb. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T02:26:41Z), 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/US85P1112004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282cf0ce062635348c2984aabe61a139e66f5452114172bc3241a635b3fc351f. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/US85P1112008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9f2cf5f18fce14554301ca52027c51cb7e00af4e8fce24a9a641660196771f. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/US85P1112011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d081caa1de3f7b8c3eea027ccdd341b3c8470427bbed2e08ae046aabf5fbdb0. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/US85P1112012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c43809f067d89bac654c86cc7905ae4dd04b578c4ac783de14c3ab028c52758. 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/US85P1112013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259065fb95c68af7747140be4c5ebb592e3ca32ba600586e8176e2d84d1204b7. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/US85P1112014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf57fd0f3c5fcec5c18d9d736c88f37b2200cd4b11c90cfcf74eda80e6fede6. 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/US85P1112018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271a44cf8d4e1c6da09fb0e03ae00951d3f4c26d56d0d3df7ab00f662864207e. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-17T03:20:13Z), 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/US85P1112020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf347dc097ec57a98d250360cd6cf02ab52a40618bb2e7c9cabedb8e6525410f0. 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/US85P1112021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07b380a269452cbc81b99446a8a8fd443f8e83eb722abe542203d04acd7e05d. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:47:26Z), 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/US85P1112023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d18bd0c6b591d495be68818f87bbbb4819a926c0318447303bf6d599e0a775. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:02:28Z), 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/US85P1112024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114adb864996a80739899a322a3520ca436a121ed14ce65e064b5aa5872b4619. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZ5HC1800500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38a5cfe964cb3f378100fa9c32dbd095648f37fbdcbf7f09758aa501e985e85. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ5HC1800502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd9c73cede3f10882237f45fe440a3cbc601f9915e95cc5fc931b5312455095. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ5HC1800504.
International Touring & Untranslatable Words
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5d872e5fb90d956868062ac043b1712329d8307ed44e0fee6fbb824a972a7a. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZ5HC1800508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60486f3f43431ee061673aba255aa78eb690dc86df7421429a625f076596896d. 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/QZ5HC1800510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882ea32225320c7036ca3f36a183accdb999e24b0fcc2bac8db6a4e8901025ab. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:42:57Z), 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/QZ5HC1800511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5618997b72916ddae773ee4050929ad62bea0a56dfdeb5632681f05585f04c55. 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/QZ5HC1800513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa8dfbfbe454f60ec09ec4519d2060e339946289ffc4fc950e974bed7ab2617. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZ5HC1800517.