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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bca1b8363d2e7ed1e9f4e2317f63378657302e835827b21c274cc24ec874f4. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e7b8e783-cb74-46b8-b6b7-69c9389fad19.json and https://artists.proofprofile.net/proofs/artist/e7b8e783-cb74-46b8-b6b7-69c9389fad19.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a2c577c1cfaef2de87da3c00d6b9cf3ef2c7835ce628048edabf00c73cecf2. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/FR26V1610253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017e324a0fec6f657786ece1583e2baee77787da4d5d83c10100085ea6c754cf. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR26V1610254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412645254529cb731943cc0f6a4b317ec0112ead33679afbaa6fc61a0ff6a7b7. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:05:25Z), 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/TCACY1766508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ca3aed8777da10daaeeae6c2b6c099276db89061beb18bbd2c095061940436. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCACY1766515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2652d2ef0bf076159d03f89604151b98c8bb5946c97679484c1251b5857a796. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/TCACY1766519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305f884ba82739cd413857e28400551e8564f5be00343a34b06178f1fdd96141. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/TCAEH1944883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7de5a243dd9c103ed4944a864692af8f592f0ea1487216fa8cbff921497eed1. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:05:01Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEP2053167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876282b72eaf6b606f4634828f6c7a1d0288a3e84f5f0c2ff1877282f10566c5. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/TCAFC2054318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009017c5d9c4253452b6242fc7073ac53a9a862cd22ebd237b3fed848ce41073. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:23:07Z), 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/TCAFX2186570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e05b377feabc0cb275a39f73af5b38663dcd63cca34ac0dd0a9db772205ecd. Chain 2 (Bitcoin): anchored in block 957892 (2026-07-13T18:21:16Z), 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/TCAFX2175893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0522dfae737493a37f539ff1608e0f9963d3b6376914cd1a03c808000c7a342. 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/FRPHC2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0522dfae737493a37f539ff1608e0f9963d3b6376914cd1a03c808000c7a342. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRPHC2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217ac787e8da196c5d26e3b788e80f1f345c648d85d4ef68cc81fda651a690ed. 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/QZHN31958971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb6b1695244477ffcf1ab0a97f22e18533ddfb5e39cf928309aa8b8107de872. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZHN31958976.
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