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 0xc27cb5f46a23f256c991bdc8088ab61871efaa52a40c9b561d4ef0a89ea3aedf. 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/11fd4de2-2524-42fb-a1fe-fb0f0a21918a.json and https://artists.proofprofile.net/proofs/artist/11fd4de2-2524-42fb-a1fe-fb0f0a21918a.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 0x65d272e7298164a2b94f27315551bb8e06a71f3faf3adac7280847463b580318. 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/QZHN42275721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e1279f8642e338277c516edb623b5c40345b9500d626ec9151b579f7f0a56f. 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/QZHN42275725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98911a4f1825a0f17755e7252c069e15cf6b9e9de668d7b2b6a3ba3504494e1. 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/QZHN42275730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02385e5b476933718fa77424d47c526041e3505d0d0883f89b7b0fd461b0b37. 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/QZNWS2370351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f5726d592ba090762c58b26010827a5d5710ae992dd4e09c03649e602660d2. 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/QZPJ32295689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870cdf1814a701ac1c4b96327ec804a35f27173fc1711d36c0da16db7ce43da0. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZPJ32348199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b749e32043929a54c8857a89fb2b3c740fc6dd42f889922bc76bf732b5da2a6. 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/QZPJ32348200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a88b9795a3400863fe36d19c23cab0e6cead6984dc44ba5d509a3f9d1f2ffe. 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/QZPJ32348201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608db97f96fdd6061edd7bcbab5fd630fec4a749a3ac8d2215513b3b8b811c2f. 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/QZPJ32348202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf699985699e22b5172f8dade753a2164cb26946d41e2315f96ac9e13a31127ef. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:33:48Z), 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/QZPJ32348203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3697ffeb67796b1baeede1e887ce54f7836d9f06da15f10b2f271af3e9774fcf. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:23:52Z), 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/QZPJ32348204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d65074c513cd65f612d6d75483c296fca5875ffe88fc3c55c88faad25a108e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:26:30Z), 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/QZPJ32348206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd365a0781281dc24e2d78d0d8dacfa46162f804776b41503d0cde6c2a9e8b603. 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/QZTAY2404707.