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 0xbb460cf8f20563cbfc2ba739c92d8dd0c3a5bf17e8ceb6149e52220cebdb013e. 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/399179a7-9d24-4abe-a0c6-094b1f8d2d91.json and https://artists.proofprofile.net/proofs/artist/399179a7-9d24-4abe-a0c6-094b1f8d2d91.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 0xb9e57c225cb5f889821058118ae248028adbe75983bcbff474d903d56397885d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/PEBQ91895675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ba2209093094873c8d34c19ae864be804977e9e7af491adaef3311be7ee506. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/SE5BU1947088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859c5f960a49a8e64337489a72e0c16abd9b29718325766d00ad5590d145631d. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/SE5751908428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36edc9d009edf582f39c98423eb95873b2ef60ad8f2c1c369fb5fa1b844ab0d7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZGLM1953803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef6f0cba5b43ca32e695cc49b0109ceab8b6e2e4e42dbc9228218bebffd4544. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US7VG2085499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7506709101f7c6ed303be9bb5006bd7fe306bf51d66ed963c101d378e8e032b9. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:07:39Z), 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/ESA012065382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0142017f319af0d20f6e13385b445f680d5949dc476592490cb703c842d3378f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ESA011832700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2629a8b887ff899f47d2248e457309b2f99a000d31da1380886a7f361eb808e. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNJV2007595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd463425db214908401af332d0d5584609cf4e62a4f6d17d9ecbb5d86b9981a27. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZNW72333175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da12e9157f3f9319a88cd15743b3837f6dc893e93f35c4c18a9c0595dddfa5d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNJY2042099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a406eebc4d619d8a46eab63f24bfd052263d59cf2c41a0740fe9942e8db7b84. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:02:54Z), 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/QZHZ32139801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e9ee89853828d14fca6da5b631342c72a9ddc2599ccabb2a969c31e73f1c00. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHZ62175788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692d4d9373fefc542ef081527dc5377befa7d91ee8f6b812a3124522751a4fe1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNJX2184258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c42fb6c65a80162c112c68099ef361ff5ca96f4a7229d4ff24d6d96a8a781c7. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZGLS2231096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e348e76077b12ce1dd5bb7b2fe84de2b6f9f3431823643bc0c57651df9a0b1. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZK6H2234079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae530c0bce91ef012999b978ae93fe619a3e057093995b20cc4c59d5e07eb64e. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/QZHNB2433650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d1998c2ba0276b32426f7282d28490cc22d2d87dc8e70a5fafd181eb7cfe64. 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/QZK6N2328935.