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 0x148a93fc5259d3ca86c7fe73fb4540298a1e4d3ab6474da550efd67381667548. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0a06fd4-cadc-4fbd-b47d-8478a8dcbc7b.json and https://artists.proofprofile.net/proofs/artist/a0a06fd4-cadc-4fbd-b47d-8478a8dcbc7b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
H.M.S. Pinafore, Act II: He Is an Englishman
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 0x0375421194773fd640a76eef8858974d63c0764daa941aa13bc58bd3cbeedd98. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723228 — a six-check JSON result.
H.M.S. Pinafore, Act I: We Sail the Ocean Blue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1a22d57f5f0b8db3335109423ed5bd39c863951fde5f48032633533e8efcc2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723200 — a six-check JSON result.
H.M.S. Pinafore, Act I: When I Was a Lad
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67bd0dd1bbf25207786fe543e2f32d7e83aad244fc296e894b63d71b115cea9d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723211 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473375034425018d518bfd36fbc93d370f6fbaef30a524f555956d54e168c960. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723205 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78799fe6bec637cfbb2e5cfd05e8ea6f0d92cf43e4354f262353d8369d3afd03. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723199 — a six-check JSON result.
Trial by Jury: Hark, The Hour of Ten Is Sounding
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d7d3be4c9078c7ad1004748a4d8ee08fd297a97c21129de88af881dfbcf544. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723302 — a six-check JSON result.
H.M.S. Pinafore, Act I: I'm Called Little Buttercup
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed987b84c9b5f007ad7e5c269fb07979a9cbb19a81a4e1af6b5e71512413260c. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723201 — a six-check JSON result.
Trial by Jury: When First My Old, Old Love I Knew
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdc299c8cfbe72cddf9461a2fa5a9464e294d24ae55fc5e0263db3183f3d792. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723304 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07aa077f02c99322c4004fc07127fd34683bd01b2a81da60e48c676205707016. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723213 — a six-check JSON result.
Trial by Jury: When I, Good Friends, Was Called to the Bar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159c86cc7fdb728afbbf09de2e9066a4a94854e967471e6714dde8a68093d1cb. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723306 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3fab1e9e46380b780f3776df7ff9df1c184155140ce59f6d53598765888fd8. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723203 — a six-check JSON result.
H.M.S. Pinafore, Act I: Sir Joseph's Barge Is Seen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20b5c149affeb33f57ce8b1f0d290dc80c3137a65aecdcb3dcac497906ead50. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723209 — a six-check JSON result.
H.M.S. Pinafore, Act I: Let's Give Three Cheers for the Sailor's Bride
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4361c6744c985cfc391bc5567ca301d8e51e16f3c583b34f46ffe07873594047. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723219 — a six-check JSON result.
H.M.S. Pinafore, Act I: Now Give Three Cheers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5e9cf322857c0eac5485dc2962bae4c56cc8289678c8407174240d8ecff8e6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723210 — a six-check JSON result.
H.M.S. Pinafore, Act I: A Maiden Fair to See
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376e5bf5743513df68ab53d1a1a6649513216d28f9703f4633961cd79de577a5. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41723204 — a six-check JSON result.