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 0xec7bd5063bb88470069b683cd9c43c7f008a69e77b4aba0eb0e7f01ca64de6e5. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a79d5d69-8755-4917-a3f9-e00f618d4d71.json and https://artists.proofprofile.net/proofs/artist/a79d5d69-8755-4917-a3f9-e00f618d4d71.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 0xebd052797f3adb95f31b38934e4b599a23f2b649a81f9ba8e197f0b0fb4f0219. 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/QZNWQ2069526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266cb1454f302a3966df88076500667cd62eefcd051d1db9c01e60be13474be4. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZNWQ2069527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab497554fe0c9cfc91e4258e5458e3015c9011dc8ca263c20a05ebd2dc7fe0f2. 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/QZNWQ2069528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7265b4f5e306a40d0d0fd1ec99205d56768089f3bf343c4673889c76ba132c9. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZNWQ2069531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cac437c3cef63f6dd2b23f23ce19aa3c527bcbe2021b0fb3a9a1a7a49785712. 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/QZNWQ2069533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d4cf3f2c5c5b7d1b58414e7b4473ee519349ebd2750403112d7bd3e3462e91. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZNWQ2069534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5605abaeefba490a833e8c34153faf10dae3f7435cc78b84837164acabe6c9a4. 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/QZTB52342068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e48f5d7695eb49d1b9850e23579ca896547190fb54d81a0d7c22a3b6a6ec49b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62290874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1738a62075e42d7efff3bed11aa483bdf13be43e2334c245893563e82a764d4a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/CLFU42100847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb884a0c83b47e60489f7dab0c40d742db57cc1d3c5be758180c23e3e08cb73b9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6Q2094284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b976d7e2ef94f8015a0e612c74a374c89f5c0905a796e1d57d737df6ddb273d. 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/USDXS2000213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5b60450cec8845e640f4cd8d43f0e98b5b5505da47391a107276b6ad33e622. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CAHQJ1924943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7834b35fd6bf5c7ce49abaa7b3f305c3e3a76c74eec6a5944ea52797f254e65f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USJ3V1837648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf6321d7173e6fc19a3fc38b5f104547a6a61b76e1e021e919124b14ab7675c. 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/QZK6J2396216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f1df68dab341c7acfa76601b85735ce85e96c83e8e4c2f238ac0a9ddefea02. 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/QZK6H2303077.