Bakker () is a common Dutch surname equivalent to English Baker. In 2007 it was the seventh most common name in the Netherlands (55,273 people).Bakker at the Meertens Institute database of surnames in
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f54c00d37ed72269e251e912faf9b54cc68f2e8335f1ca1cab1b3b9c192877. Chain 2 (Bitcoin): anchored in block 954729 (2026-06-21T18:16:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb844106-fcd2-4b60-93af-dda6b5e0857a.json and https://artists.proofprofile.net/proofs/artist/fb844106-fcd2-4b60-93af-dda6b5e0857a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).