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 0xcfdcfbe94ce35c3b20886d24de983b20a8d84cd180c2724977dfa178adf70196. 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/56b12a6b-6a24-436b-be50-aa422b31a194.json and https://artists.proofprofile.net/proofs/artist/56b12a6b-6a24-436b-be50-aa422b31a194.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 0xd287aa0465bf9ebdf24db10e40c31a17a58f7ff1a444f9238433815e6e1cfa89. 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/TCAGJ2277665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa3020dcf46b0255c90a86c918cc19ab230cb575ecf6c7acb558ad1d244683a. 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/QM6P42490775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa3020dcf46b0255c90a86c918cc19ab230cb575ecf6c7acb558ad1d244683a. 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/QM6P42490775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba158f9f6974c636f5098bb3ceb9a0076d95afbe04d63b4b7c843e484029b5e. 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/QZHNC2306559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6608a46aa44ab58c965e38518214ec689d1602a6194b98ef0697dd766b10820. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZPEW2461461.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7dd189f863aefdac285ac1350dcb130e54f669043bde1efcc6f856c93b4477. 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/QZSYP2369509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447c8b197fcfa0c9ec3b675da00a2d9e88b85a3266fcabe1399a8d5b12929b6c. 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/QZS7J2300929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38a3c69c8fab0610aa89a054514a564eb19136096cc489165b92c58936da2c9. 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/QZS7J2307400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5b36ce658ed1bb29e6d99112186b2fb10cd88482eaf3486e490503d1bad6e7. 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/QZTLA2457255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8865670028907563e9d35cca48429836021a65332b47d15688212a628669f70d. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZS7J2320833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933a893a8a1ee10470d79f997ebb84580efbb23b1d48546861ff4182b2c8f85b. 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/QZS7J2383123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d7d9431d1ac9302adff0491bc816aa6a5ef77e39e923c08c04279ec1684dda. 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/QZS7J2357106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3e637ac8687cf6da2b37bbde3c20d128c05099be9658342570feb7c458a7e3. 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/QZS7J2383116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e36dbbf2e0b52fc1a53067ecb64e3692dac546ca251c1b53774d5965eef9a2. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZS7J2356469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4b7bfb2896e8e0e17361c61c323cd59358a23a82df263bc2891dd602b0306d. 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/QZS7J2388337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740d974df987f4bb63871b4489540783ad2310014add69d7d851889d36014f47. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZS7J2357482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57152488b6bc68553bed3a68abbfe23fb672e8a6acc027251fae8be32cceec03. 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/QZQAY2406305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4b7bfb2896e8e0e17361c61c323cd59358a23a82df263bc2891dd602b0306d. 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/QZS7J2388337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5b36ce658ed1bb29e6d99112186b2fb10cd88482eaf3486e490503d1bad6e7. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZTLA2457255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38a3c69c8fab0610aa89a054514a564eb19136096cc489165b92c58936da2c9. 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/QZS7J2307400.