IJsbrand is a Dutch male given name of late Old Dutch or early Middle Dutch origins. The first syllable, "eis" (or ijs/ys), is derived from the old West Germanic word for iron. The second syllable, "b
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 0x975223f207f724491329c9c1eca9461470928dbc0e0830956c03af8ae395b827. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/954ac24c-74a7-47d9-aeb3-3f49f6543b23.json and https://artists.proofprofile.net/proofs/artist/954ac24c-74a7-47d9-aeb3-3f49f6543b23.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).