ETK may refer to: ETK, a fictional car brand from BeamNG.drive mainly based on BMW Commune of the Working People of Estonia (Estonian: ) Edakkad railway station, in Kerala, India EPH receptor A3,
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 0x3c21ef2154b875c7580cd4803cae826b1928ccdef024b70b43c0aa0ba20aa6f2. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6d56328-3e6d-4896-b333-c0c009eb727d.json and https://artists.proofprofile.net/proofs/artist/e6d56328-3e6d-4896-b333-c0c009eb727d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).