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 0xbe7e79b8dc0e2673b9ad793eb887785b308727224f98e0a9455ebec5395822d4. 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/f30759cf-6aa2-44a1-97f3-7b35a74a67fd.json and https://artists.proofprofile.net/proofs/artist/f30759cf-6aa2-44a1-97f3-7b35a74a67fd.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 0x165891e27e865b30de7d264d380ab6065c93d59b33201a46eabd940edb76e645. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHN82187285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d2eff14360206f948a1240e458b2197445eb7220dc61be294e227185025347. 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/QZDA62383378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c79dbb46bfc89f6873f4acf52ded645c9f6469e4226b6e848e6004f5b0850d1. 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/QZDA62383379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc44fbe85bcb726ab1e69499d987bc2f36bd26d289b0179c0657939ba54d73e6. 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/QZDA62383384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eed13afd46aa1582e4d42291f429e97bc5d684a8b3e46ca891731478286efdb. 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/QZDA62383385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e7df110bd04606eae49ea0b5d892df60b2d6249f09ab8a941774af9b315874. 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/QZDA62383386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc07304c4b1cc6809bc0b734bb16f25d39b4a1cecccf867a0d6957c8b443f29. 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/QZDA62383387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3408928b56d176f0a60e242e271678c24d86f08ef248038598c36dcb7555365f. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA62383388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fda4a0bd48a35a8ee80f5dfec2bb71fca08bc14bb1477e57a5293f8f0ac8f3. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZMEQ2326423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da72e1660ae14ee297adb41bacce1054938b726e0e31da812aba690c93041cc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR9W12361146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d897b1c465700edadf78a599d3c19b25d3a292dc0e33a8341d21bff49e1c2c4. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/FR9W12361149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdec5ce70c8e6c79886acc84d45b8fb55cad6714aeea186d675f434d11f42596. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-27T14:03:11Z), 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/FR9W12361148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d3a348fe704b187f6fb01678043a9747892ba146e26011c2efb9e10cfca0bc. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:50:04Z), 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/FR9W12361151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5232418f1cf0c75839dbfffb24cbee8955d05ad9e906cba4de7eb81f59806bb7. 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/QZK6F2458697.