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 0xb66ae096fcf4b65aa22d57bee28b1a784daae94887ecf96b7abf958db7905855. 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/8bdf087e-564a-411b-b953-4a995cadf043.json and https://artists.proofprofile.net/proofs/artist/8bdf087e-564a-411b-b953-4a995cadf043.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 0x379f23b18588dfba6eb9892346fe3ce2bfc02ed12b9c18c646131b873e51e068. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWU2343067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d952501c64451b9da190f36d8a98ef18cedf6315ee35d416c41d5135ce2307. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWU2343068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ae6bfa956c503ca31b77dd1a8a4e54b59af5c32292f9602ced74d73880c0c5. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/QZNWV2313019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2514b22d8a374b4cacebb24fd469b851f63709b0fb7564bec8ba9fd131c0f7ea. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/QZNWW2319683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78c27625dd14c6937125355d2b646187ac3b679b59796f17fe2829bf29ec668. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZNWV2316666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89128785acead6b836f34e5cf0882f5327f2e16e9a68999f07bc484299c21cd. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZNWW2319673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8e5be26aa4bca5dc512f4ba926517e44b554ac1a5e4d58942aa54af132ada5. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZNWY2383334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ed72baa6779e2c66b53d1c7a2494ac42fb0b0f42e9b19a0cebf11ad4211175. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZTAS2349673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf6e37169662aab2a10d429c008c8d307f9795a61edf3dde98edf6037be8010. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZTAU2383636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51454eba4a85975167ca9e7a96e992e036eae68fa33d47225bcae47d7f36ed3e. 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/QZTBE2368726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80ebbd2193563699b316a7ba2f3edfd4b2b6e73aced5bcd81664286e97b3618. 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/QZDA42478362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572e38da37e7dc8584fca4adcf8594cb507c10c78bab6409309ef26abc56bead. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZES62468801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263144a0be0957a8ee9f8ab63b80049e246cc169475e900eef134e732f3243c4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHN42491040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41910f620dc64920ac22699389c88a436019ebbb522fd95fee1bbdc4a83d894a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZMER2421990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a9ed198e9fa3dd97c883083817cbcd3e81c8b246846e3adaa913f5da30b9c4. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZNWT2445746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712eb5bfe83bcf409cf5bcbc695ea87c2bd4dc41907683a98c6fed6ee4c541d9. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZNWW2420177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30eb52bcc62716162d913f2ccaa442a7a99bb5010de8212fc396b34b00b36a6. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZTB52466912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba5e4de75d4e05c19f821c6df624468caa48ab91e71124093430da82e692ec2. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTBA2418306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e6a2b12cfe855f4bd193b80f0fdcae48985dee5e6bfae51c9966bab1bd3649. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZTVM2425204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fcfc562b9fac5339f58546c280cb0304188b9fd57c6d8ca0e02ded886e95d9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ32516819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdedcfcdb44f95d9863ef8ec2723f48c902d1cef9e7adc8bb341f32b31b9bada6. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6N2509643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aac0302bde0adbc57a87f7eef3de8605992f147789715e08710c2c22f78e954. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZMEP2565847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2568d9f16e1f222f23d72da2c7c6627c5ecfeb893c3a0bfaadf5255401377cb. 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/QZPLS2561239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e78baec064315de93077f7cdedb42fc6f915bc8ff05df869f54e3ef24f268a3. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFR2573320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bdcf4c46cdaf9edc3bbe51ad6d5050d6c68185c0552e3521a853ddfeb263cc. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZWFT2574190.