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 0x9dd720f90806c9713c053ebe3ae8a573d2c847f4555a64392fe0bf1c6eb6f56b. 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/da8c50c5-530c-4540-a157-722d530d5516.json and https://artists.proofprofile.net/proofs/artist/da8c50c5-530c-4540-a157-722d530d5516.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 0x774313c77c49ce269536e1a8d1fefbe7bc654c533b30a7cfd51315f4cea35f0c. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:07:52Z), 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/DEFZ71500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6c305778fd2d797ed97227d4c5efd3759ff909eb19f61b4397ffc0a7b8e10b. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/DEFZ71500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8729f1411a29ea5fdbb06354a33ff5c5ec939d670b3d0f291da1584c57d9c8ee. 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/DEFZ71500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d5ef336135440704c98ff1422aa760d333721786d51874673380209cddccfc. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/DEFZ71500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26072c80d7506440d888c419b28205e75a59705382a3687a7275012c408dbffa. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T07:36:28Z), 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/DEFZ71500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75ae2baaa1b530c56615a2c963fd580d37adddf42af584bbc1f1ee9ea89b492. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEFZ71500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abed91140f1abf0097a75fc6a7102b4c920c6e047381d4c034f9b21d3bded60. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/DEFZ71600252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e274d4b6e500b16c9c9ce9167ee81f94b1a585d23a02b5d9dddd20b9704b9b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEFZ71600258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a6dab3e0f13d33105c86bf3f054a387f986eaa67cbc26de1986a13de1c5be0. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/DEFZ71600259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68b3eb6ec8f892b4cdaea365bf0e9a34aa8013f028f1c592e9edf9cd31275c0. 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/DEFZ71600261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0630045c98fe10f0a9bfb435fbac07608a4c521af452911eddbc416118d16fc. 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/DEFZ71600262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e8131b818166da2d1aac2f80979bee0d4f978566acd44b3404310155f64b06. 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/DEFZ71600263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe564435522430afdf0d8e0197201115d675ef8fffece7ca29c007581e2d25d25. 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/CH7811922451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc6f33dbe078f1abc5b4315a84b6fcbca935c27875037daf2425ff508a27653. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CH7811926057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6445cad3b13b15e5887251115a383f758d2a69e23e85a887f0ad6e71672b672. 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/CH7812037806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d33e57deac55c1950c20123dfb4f195a8a8cb04fb26e7549dc4dae760868fa. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/CH7812049294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920ea80638adde4c3a9fac36857371ab68f14d62cff7136d4bf472fd1ba0e8f7. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/CH7812180030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2453eaec0964d9143356993a9af1bcad5242b8875ae37a1b18df18a79a8666dd. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/DEKF22200730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672a856d8b72049df4e22d5e2f89251a77d54684f1e3e26862232fb06951bbfc. 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/CH7812366989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f0b03a1be38dace654817eb1bc7ab2bf15db7f75fde1c8f9d0c9faaba4fbda. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ8LD1792375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b648474328e0049b4fc2e79c930fa1b1190836b79e829aa4d105a3023eeb37. 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/DEFZ71600328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13926ebe2dec109639a8ab794780a95e4df899fd96171a4c88f6bbb417f8187. 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/DEFZ71700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8505cf7551363aa6a56071cf452c7f827138d1ba5c6d90497703d2d106579d. 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/DEFZ71500031.