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 0x1ddeaa9b60466bc1ad68673a5c05625c8b03684953fc6f1be7b4674c179d19ef. 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/6bf35271-2bf3-4512-bde2-2bc345041647.json and https://artists.proofprofile.net/proofs/artist/6bf35271-2bf3-4512-bde2-2bc345041647.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 0x455a88db7bd47e90b9aef2cb7574f5161faf629f8d3c8d541fa4a0d159c37ccb. 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/QZPLS2455148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa746c87d72eccb8e3786f9cfd854da7cb2a04c7fcd9abfbb0683549650e168. 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/TCADO1871408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2f91161df3d9e251de342fa6f76bf4d42529f59abb38c236c83391e9ef7426. 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/GBUEF2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf336d481c1c52e959b66491598734d2e57fcf31ce3e2a32add63e607da5d934d. 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/QM24S1910129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7111ed23b6e087c0deb0bd9d4cffa85d6c241561748b1b3179e7c163f6c9724b. 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/QZVR22300207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016ef2d4f188854e0887306cf011a30990c72aadbea42a561d3a3791b0da7fac. 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/QZVR22300278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587bfad62d50417fea241ebac1646b151b19fa9d43318251d9ea33c53726a5fe. 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/USUG12001860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83d61d2d283044a07ddc0a0fc2d7537483cfa5a0c4c756bb766f48b9160ec37. 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/TCADX1830439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2df2f5d151051d8f16eb47c4e81e3d0edbcaf5adba393162c9ca7825a4e2a75. 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/TCADL1881373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2df2f5d151051d8f16eb47c4e81e3d0edbcaf5adba393162c9ca7825a4e2a75. 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/TCADL1881373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac321d7ccdfbf16cb6c3aee5d04040cb7514183cbc82b7280c4a0b1e6379aea. 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/QZVR22400287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa746c87d72eccb8e3786f9cfd854da7cb2a04c7fcd9abfbb0683549650e168. 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/TCADO1871408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a25c861067fb8e6b5342fd1ebca09e62efd1b5b1eaa15542b75b4ac4d1769a5. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USUG12003379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28030349bafe1e2d2c1dded88309b47f7ee1b39ed8157bcd91d3f23ecab68009. 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/USUG12003378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b814c15870023fbd6a23133b21e33da0b6789005ad626b92908b204d15b4a9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZPLS2455149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804f27dc44b2ce3e8cc8169a0cd083ccfe80990a635745b9087964bedec084d9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZPLS2455147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9f250796b85345a6e70e0045c13a791456b00273d9b38b2b30628af5b7d00b. 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/QZDA62400338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69358486a8d056562b7baf82f0bcc06f48592edc02fa7608df98490db1e0bfce. 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/QZK6J2029637.