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 0x560463dc74108e72b9f95637c246beb7ab3a7f17681b9bd2a3884744b0a145cb. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed0f74a2-5230-4da5-aaac-2736ac0a8449.json and https://artists.proofprofile.net/proofs/artist/ed0f74a2-5230-4da5-aaac-2736ac0a8449.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 0xcba0c96dc624bb8ffb020ce69ed38ab9dd23144a59813c3e597fb7e0386a1d0f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZES92093619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ec6cb47b5cd87ec1190fa2c20b9115ae1f578f705a92e7e8c7781ef938653f. 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/QZNWS2011379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfcdd53490b6badbfb81cc54c2fd41eab8b266ea79c2faeefa8bbd2e6e9d769. 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/QZES92031195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc811fdb1c370aa3eb9ced7fa027be859839e636b0acde8e750bcff8f5fe82243. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN42044878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a32d968a119f1e45d815b8bf624cd8f1851912a54884fa350a7cd8e8a01034. 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/QZK6G2083304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa276ac543d32177c037387f7f8144d4af3487d8d555a1d2e40cb0363687ff193. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN72061426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1771aa83705e211a02c128217cf567910eca13cb8a3b2beebacbed9d15a30036. 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/QZHN72061427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0910f916171637e768dbce3d90908a93560c2b8a3348cc3252d2bbed38e30fe. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN72061428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44ac661ef88ba0b0926db89eefb087d1269a520ce1a835fb83825e9caccf17c. 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/QZHN72061429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061d1b3be36aee675ff0d92632a214f4d6d4e2a571ea2a39907e792d6751a8db. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZHN72061430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba873ef2aa9fc66c8a24df679985ae4605a9198750910532bdb76d42a08eb6e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZHN72061433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5359ac922eb5a294fa41b5523d821da766964717e84941a13ed2992eeecc26e2. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZX6V2301140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e1e6f5045c825cef0a5a16276d77314846930bbf0d7852710f43a5cdb8ca1f. 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/QZHN52410161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9884df17c1d3d6fb1fbe51198794f963e05e3fb905c9d45ce4ba0bf8ea65862d. 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/QZTBD2311328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5a5f80eea748b9a5d19e58e926357c4c14f9e0ae9353a65166961525496b32. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZNWZ2383799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba0c96dc624bb8ffb020ce69ed38ab9dd23144a59813c3e597fb7e0386a1d0f. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZES92093619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06294389fb0a1a60b95ad4233fc7c344f5be741ce0889fb2fcc9e7b16a68c619. 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/QZX6V2301170.