thumb|Mentzel in February 2011. Achim Mentzel (15 July 1946 – 4 January 2016) was a German musician, television presenter and actor. He was best known for hosting his show Achims Hitparade from 1989
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 0xd86b8828c1e189c635588cdbf520c2e7de8483ae3669cb51046eecc36adfe3ba. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38575828-92b1-4ddc-bd49-4797d059ea89.json and https://artists.proofprofile.net/proofs/artist/38575828-92b1-4ddc-bd49-4797d059ea89.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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