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 0x9b0840861cf818963b5b2c5c37a7bbfc655827710f6099699578d9568c5ac97f. 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/85731bb0-e31c-4fb2-a077-9bdc0b787a13.json and https://artists.proofprofile.net/proofs/artist/85731bb0-e31c-4fb2-a077-9bdc0b787a13.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 0x62f13c0088739f84f5c9df2d9e661ede55f8b82fe20a9a898f133eea04487042. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/UKU932240366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06e0051e0a4d3a2bedad942987ec17741274dfe3e3cbfb8d885d77e6c613fe6. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/UKU932240367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cc184c976b4ecd2588aff42c2a787b6075b61472c57230a6fe3f5ef7b31666. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/UKU932240369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa905723ce1f3a62702537dd274efc787afd82872cf4499af5ddf82892bef80d8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZMHN2217459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06a258158b9213a525087ca0ca1ad12f4062ae07cf1cbb40dbb89e852de2c88. 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/QZS632280056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd0a4772a4a3c60c38dc3f79714cd76abe33613110823f72da2a73b16c4761c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRX762262387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53362c94cc3b7b0cd007298f61687d7c2a4afe9b30f396ce8906fe129a8b1bd6. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FR2X42488279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639c66d414275732789ea7f9915527ae191975a1634bc3e6bdb6a07472b21f4b. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DGA0Q2454586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfcd523f827f1261dc4b71aef49c20b4457914a1cdb7d692fac74d03d2d7ddb. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/DGA0Q2454587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8955b39e6465f8855425cddeb65d60de2237dcaba546fa1dbc5fc7e8c06ed000. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/DGA0Q2454589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877063464e0ad717afe3643548d566c8f603e2ba929b0762d12b1e2af88601a3. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/DGA0Q2454590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8929c9a60baed39b1678583f90c9b6f067572ced62231ff96186eb22c6636a. 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/DGA0T2402541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdf7e08a3e65612694b30440c9a293b77f131bde4a2da7f70ed77bf888cfdcc. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX282540409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a1788a5157949c50d6903e889f368b9c17626805268bff6fe3fb7eb30fdc48. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/FRX872537399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f59a55afe5ad0f5c0a3597602b020df574d437605ee47d98c7bf3a2bdd262b. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZTBA2337484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f59a55afe5ad0f5c0a3597602b020df574d437605ee47d98c7bf3a2bdd262b. 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/QZTBA2337484.