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 0x097fa168ff345c8db91208d020d6c8fc7038a2c435e10255219173c817b54a99. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af740b7c-1c28-4ed2-9051-e38570ec882f.json and https://artists.proofprofile.net/proofs/artist/af740b7c-1c28-4ed2-9051-e38570ec882f.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 0x5102a1a65d7a956493d49dfd788243b8b63df3429e31dd6b638df46eeceadcd0. 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/US83Z2121206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3488c39778d5c26ac4f10688adf49fa9ef687aa8e80355e6300932306997f6af. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEH742032484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2510cbc5a7d35b792593d28703a13c81023d8d1354163cbe3a79da068f81ec8. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DZA102401086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f9b8df6aa251576290b6c09714e2d9122c30ee6a2a6ed2fd04b1ac4d8cfa85. 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/QZZ662478228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f9835d2fb6b4b323a1029bc7160d1edd2c927e354b244a0966ad2e48d85c0a. 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/QZ5FN2417826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b84fac3e5d887cab8672d0830611924217056a4bd1e4bb27c17932fbe9e4a4e. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/US83Z2350053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3806eba430e87bf1838cacee999cf71d76361e8ba737feef099d737a1f6ba513. 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/QZYFZ2307564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ac87f419294ab95b176d5f8ebaa2264c530d7f172d9fbf03b1a61842bf8362. 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/QZN882241415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2200054e28d389f03c4b45d714f0190147df100d341a2acd397e03f5e70e79a6. 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/CH6542167473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0eaf5fe62506b25147d1c494813c0e171dcb89a38febf30a7beddcc0c3db61. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEH742008480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041c252bf926f14c4eff38a0ed363d75b45c6407e02c299def18da479457c628. 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/DEH742008482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1affcbce0d1879277514954925fb0cf541b1a251f41fa392e921a13c2080256e. 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/CH6542004568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845ca1e509bc4d529b7ed7d5c3cfda6267f5c402b70bb8f09cda18f0dd9fb30a. 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/CH6541669642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906c645271269df4c691733491eda7fadd49d3e571dbc310a71c0f3dd3cfd123. 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/CH6542116018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec63b1aaefbcb58ba3488c668d4f095d4726b0531fe62ac583d8c4be7c577bfe. 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/CAENV2365291.