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 0x9e8096b69cbe8a3359afe5e20099d6614eea1a3a82704f85d2ddd01af26ebd87. 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/743e19bd-0f93-41b7-ac62-0319e37007aa.json and https://artists.proofprofile.net/proofs/artist/743e19bd-0f93-41b7-ac62-0319e37007aa.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 0xf34e718c21c2dec1e372750619c9a2e1529849b29747741e2cba181c2cfd64a8. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/TCAFE2058711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407575b25cc51dfa95ffef78f9f4234d07961a04ef70bc297b415b32aef0c8fa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAFE2058731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85352caec99a40b3c4d328b60cfbd051b72618216f657c46830890d5bbf47024. 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/TCAFE2058734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993ec4ac698b8b61d6daed50a07695280443f402240501f8c69c594fc70e54f4. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/TCAFE2058736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92121b8ec037029558d7a249c4700958580a60c133ca557cb801bf9029a5f75e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAFE2058740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8735e2a48b60aa24d4c0af56e485f03911beb4a9fb9635e29192f2a291fd30. 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/TCAFE2058770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea42012390657bae3ed9a67d39f4ded8585b034951b9c35cb1187c419047d3a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCAFE2058772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ce0ff0e2a1d43abc46f85abf4f15ffd1107125744eeafb8bac4fd419d0cf8d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAFS2192891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb483bc5f4f9ec7ea18446e404d6ce59d5695fb9a1e771ad31b0ecda2d394130d. 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/TCAFS2192759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4bdbaffadaa77b4176084e8a2fe34a4c91df95de8544d11f2b0ad509bf6918. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCAFS2192912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7682c16f0143d0125206c8ad44093e0fe410d61233b369414775a144c108235d. 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/TCAFO2135332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6657e4480b14c52d552bc0e0082328d8ec85cfbb566da10163ee4191d6bf5322. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAFS2192926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd20ae61c8a6722f3cf0f1500ee598093d93539acdbe69bc630c983bebea8fafa. 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/TCAFS2193112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38a8887274565110c51ee2d70c2bcfdef75fa8c983d4833f21fcd136337b9ec. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAFS2193115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62e33950af1b7f5f5f207abef48a7bd0e28a93b56b4ccd6e0367361beb31d6e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCAFS2193120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac92d91eccd0eab8780cbd2c8f4581a24e4da432895ea6140c8d1832c8ba641. 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/TCAFS2193154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c15b0ca42c8623fa5596f85cf10db94f89fd6a13f32549c91d141dafa74a3d. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/TCAFS2193170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f212944d3a20e4662b7ac0f172f00590042ba7d50f7b62350f808afedbb816. 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/TCAET2096878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e57ab6ce57493fe69ac278c64e526323cbe0f18f2817d133b8554a214b14d35. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCAEZ2078222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1049ae9aedbdbb362cf34047894652135701b21e262a161165f336a2d2914aa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/IT2G32100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7cde5eb21357a583ec76b023fa68aac29d69c3e987c21507ec78f09c0ad18a. 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/ITRSE1600480.