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 0xef06207d1814e76b2040dec6d31e60930fea19194adc40dd057fc3365b40cb47. 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/e08f8109-669c-4af8-9542-6b6e10312d0b.json and https://artists.proofprofile.net/proofs/artist/e08f8109-669c-4af8-9542-6b6e10312d0b.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 0xfa2d1a14c39fa3940d59b05ebf7facf10ecb8c2cc98fc84f590a7bab204d791c. 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/TCAFS2106648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17c3dd00fbf82fd4dfe02c5fddf11b60f7c417d473f67879159a2e96a07b238. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/ZAJAU2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a888f00fb6a0bb33d1b06fb37237f6f2a49b13284250a5a05a1f83e1589b82f. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/ZAJAU2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6726f58116cbef5022382b988955dd8530294a37fa6331899060abb2603ec88. 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/ZAJAU2000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf245b7a0580c779c57df75983bb2e093c78fd277f8c92aba1dab19310c6c38d6. 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/ZAJAU2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9cde709f092a11aafe5c941c364dd6617822088e66f8c3210d243eea6e7985. 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/ZAJAU2000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd1e428b9e8c596c2be25d79f2b6f066c5c7cce6984b2e92c2e09ac7a2ef6ca. 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/ZAJAU2000025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8714189d40180d096bc4dc1ed3fa3867bfc8573ffa83981ca29bc2adc44b9a1. 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/ZAJAU2000028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9229cf45c62a44ea5b4061f2e653286752f7daf644c8cf7a6ad0a18fc0582d7. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/ZAJAU2000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07b15140393bf3c8215832848e3980cca31b88e5552c90497bd100b1aa30b6a. 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/ZAJAU2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7a039fb1b91074d198e3ec0614515a606afdafea757eb7674d95cbc4bfd804. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/TCAGB2243126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09cd1072db59e70a14c004f261401abb245a289b9465b69634b4118b727f9e8c. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TCAGB2243132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0ef9c9c76133bd3b864f6bf50cf81f76b618a59a28283a7824f027fbee02e9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAGB2243135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55023f3054ba4fa176a9914369679d543ddcc037aea5c3a7f1c56c54b0f0ea6e. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/TCAGB2243138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f2e4c8862e93ac5e9e5dfd36c96446c046612cbf63ac0a46ed3533f09c46b1. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/TCAGB2243140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f79035c74a8b98f7b1e62f2674973bb1fdedbfc2c43c507c5005ffad9f06acb. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/TCAGB2243150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebaab31fc0bfd7f1d7ef8408f3e1946953bb19f37db3e92f6c677b0178542f9. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TCAGB2243155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b8efb55c95bf7a48da0d447f8a4225f28b3104b359bdaf22e94fbc3cd2526d. 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/TCAGB2243170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb831195331aa29b2b8ff2fac231fef7cb5a82f278b4b3bf35725a3dde1a57ffb. 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/ZAWQ91800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3853996dbb0917fd01f42861b921ca4e6bc508ab061449677fbb38153f6bc221. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/ZAWQ91800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a2a9db291ef48b5472877014ef11c46ff7b2e1f62e9de1c610ddc5c878a49e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBMA22479024.