Koets means coach (a four-wheeled carriage) in Dutch. It is a Dutch surname that may refer to Adam Koets (born 1984), American football offensive tackle Arent Jacobsz Koets (c.1600–1635), Dutch conci
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 0xe54f8be74f2816b870ae4eb672a17278ff61e4e36df143a0b6d4654fef558b19. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67a13425-348f-4097-ad3b-6b6b8d37ec97.json and https://artists.proofprofile.net/proofs/artist/67a13425-348f-4097-ad3b-6b6b8d37ec97.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).