Erik Johansen (3 September 1928 – 5 July 2012) was a Danish sailor. He competed in the 5.5 Metre event at the 1968 Summer Olympics. Johansen died in Denmark on 5 July 2012, at the age of 83. Referenc
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 0x39edf37839a3739112ffd99f665577b930c94dfe2e04eb6fbd340cf2b1d6b199. Chain 2 (Bitcoin): anchored in block 953875 (2026-06-16T02:12:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07ffc1c0-a3cc-49b6-a923-a6503cf9f11d.json and https://artists.proofprofile.net/proofs/artist/07ffc1c0-a3cc-49b6-a923-a6503cf9f11d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.