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 0xc9adb1a87b35361adbf5548e6f6f6829297aec272fce7e44f8b1445e4cf304b1. 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/eaa90c9b-2669-46d8-99ad-2ceadfe74820.json and https://artists.proofprofile.net/proofs/artist/eaa90c9b-2669-46d8-99ad-2ceadfe74820.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 0x9bed56ef9f02931b315912e44ed5a1d6e4e77a71948f1e368da1ab66beda8d07. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DEA892200230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc5161301f1a6166f8eb2633c14276abb13e141a276cb991b0f3e22752cc232. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DEA892200231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141a3d21532272a58ebf619edf3b56fda85dec9f1c1127578e53f136a8ad54e2. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/DEA892200232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9389f28848f0e1edd1304312ef4402ac2d4a1ed62027e888661ef04f550e945f. 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/DEA892400608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d093083f01bdf7fb41f05b05ff7c44c23265555cf8ab36ef2a2f08d453ac14. 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/DEA892400609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab81f12698e76ccfb51ec7c53b4e5a502f33f7f98b0fdbdf77764f0342cf27c6. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEA892400610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e6fbcc5a3f5a482d89362b6bc73ddc253640a3593eadd9daab0bc427be579b. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/DEA892400611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2639a99c058f743415c28845eaf441b9ff2ee810c5b4f7b108c15c00640dfb. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/DEA892400612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bc5a0984edcec02accec7c88fde8433dd0a37a02796ec46412ab39d81f14f0. 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/DEA892400613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3fcb7579f0836ebafe7043b2f7ae084bf46e7722fdb5b34c2e67518373a9be. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/DEA892400614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9e934f90d3a807da3c5691ea644e97c57aab71f06b9702bc6f1104e8bdf46e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/DEA892400615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6be3af8618a6c601551090fecd8f8bc6e872ec87d683030a4fc9eb1e8671be2. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/DEA892400616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4af40ee831d10c5bd91a2d52a7f26c27577c96c6c8b5aa483ff4b4a07c88a05. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DEA892400617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9343ab67705f6aad27844d27aeaa73effaf376d2abf7bad9c4b3463d81d4d3d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEA892400618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a249f96ecf2d533a9864a3da45cebbc0de9a7a5e81c4979ff817e19a0bc64ee. 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/DEA892500205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167dae70436680ec201261f0704853ee5b4edaa785efb5e2ee8c72da540eb1ae. 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/DEA892500200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3356d1ad3e62e5da938016be608f4e63a6efcdf4ffe418f2e1942ec06c1d1504. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/DEA892500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c4c98db892dbeb7e6252e4982d56dd23cc329b5417423d65900614554e776d. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/DEA892500202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828b673fd0cde95a9a126a99a806837503abe62d1a75daee2228e5879d8e9366. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEA892200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1648d77c7043c97937bd57d8d5bf4e47e522d08955bc572069e849f7825f72f4. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEA892200082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78511e1470216bcc02506d0f963944cfc0dec6e574dc23cc21bd00921288f2d6. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/DEA892200083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ec8f330fb019aecc53e461db9bcbc3809e24b65ce172185a59cd7653c266fe. 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/DEA892200084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367b8f6d54131c7499b00045ac9fe252c9e2992300a8350bb8e843c179343687. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/DEA892200085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8841a879289c34dbcddd15088ac6d7720015e52d1b2f02b0e17344119fe344b. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DEA892200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406cefda4c900f275aa5c1bc8a759a6046917e6f96b4cb3b095ffa380bf5e6b1. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/DEA892200355.