Hans Engelmann (16 June 1872 – 5 May 1914) was a composer of popular music in the late 19th and early 20th centuries. Although little is remembered of him today, his work was greatly appreciated in hi
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 0xd6d40f650ff1ea43e64e7a58638396b0283873d26067e0bb791e6f13be80f692. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ebb27068-048c-417c-a894-5b110175dbe3.json and https://artists.proofprofile.net/proofs/artist/ebb27068-048c-417c-a894-5b110175dbe3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.