thumb|Market Church in Halle (Saale), seen from the Market Square thumb|The Reichel organ in the Market Church Friedrich Wilhelm Zachow or Zachau (14 November 1663 – 7 August 1712) was a German music
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 0xf4dbce98012acc49b970dc8116bef8ec72b0804cc448501197d66d588ac49627. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be690ee5-0efa-49f4-88f3-c7229f57283c.json and https://artists.proofprofile.net/proofs/artist/be690ee5-0efa-49f4-88f3-c7229f57283c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Jesus Christus Unser Heiland, Der Von Uns (LV 36)
Jesus Christus Unser Heiland, Der Von Uns (LV 7)
Warum betrübst du dich, mein Herz (LV 52)
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 0x60824b92993ecdd83f35eecdb56da11de26f17852f7691d44611729e6ce30720. 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/DES380001605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4c34af0cc3cbc6647214666f33197a45a2963d67637fa90f7f0b3f121358e9. 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/DES380001613.