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 0x4ca1bab433e220d6e7207c32770885f113906e9a3214239f231ddf44e5b835cc. 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/e55a2cd9-e0c3-4e00-a3ab-7b29cf67a609.json and https://artists.proofprofile.net/proofs/artist/e55a2cd9-e0c3-4e00-a3ab-7b29cf67a609.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 0xcbd1053571ad03c6eec0ac36ceaa06057b2ef5c4121725060749e1f2368a0c28. 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/DGA082392645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd654e1d2545726757273c71b61f22b630fb8883af5cf0ef6a5382298d79daf. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/HKE022238569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cab5a95da74c6fb38372e83e60b7a2dec6ad5568d65b550e05be19f4a9dd010. 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/HKE022238570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffce8f85df18c6c338fe8b51b390659492b3f6136078a596f5270de4d5a875a. 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/HKD012565689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543b173c1dfc484d45f2196896078ba12d8c591451b03e0b44a8bb1a10ea70eb. 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/HKD012565509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13a0335fae170b7791770259271df6996a76838e475d073b37171868f66a992. 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/FRX452502593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645a59673b5b32578e4686d3c143be98aa14ee493d5821138717d07f1b467f0e. 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/FRX452506012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765245885b81fa8082eef815ff2cfbc991da865025f55f8224e42cdea41cd963. 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/FRX452506013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755f889ce8dd12c88e57e011c7926f1d84cf79b938c31d2708a1bfd6c8c30670. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FRX282510386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce017588490c88a3591f99ef4095cb79161785fa0a11937626af308579ed7fcc. 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/FRX202525979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4eb41fbb99b9f6b9d02bb3c5ee0423d8c3ea0b3b927c4b536d463c05c010540. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX282569278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae15429e7dc417965f7f4c585dcb27c7998f7bbd95875f69608daf6ffb3610cf. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3T42513640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a3d31e3a74c89cfa620addaeddceeca2d611c154997658c342e34b3ee4807d. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/HKE022303253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74746b198b6363b5c2ffe4477b36abc91ffbf480301913b14e31069efa8f4993. 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/HKE022304524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804647604763743b06f7aed348114b72fad6b21d4d2e164be2f167b129c4c357. 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/HKE022304428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bba528c86e82bf819ad12ca52b7dc480003dae65ff74f1225d33cef7499e59c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/KJP8B8312430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43de03ee9cc347e6916eb379fcdf9d7aa3ec148f12804a408343e2c490373cd. 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/DGA0T2445688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36caebce02c12b4baaf277800ebe8010bae492103c4a92789dc7c67b8d8febd. 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/HKD012523460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e7ac6f5931227b3fdc2822336b8a2f73894ca065d750a4515ede69dc6fc020. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA0T2425370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eefd118470d6b07d427bcc769ee48c153c3f9740f1a13b563fbba27307bcd0e. 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/FR10S2481895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acb7b396cb7855a64188d92ce1ef5b785fdbaebae29460d059bd23c425e53b4. 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/FRX872309612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1f73465de20c283eb16283be2f6637bc0df841ba39289bff1feffc6395144c. 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/DGA092472799.