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 0x03fe526caba289f802dffd5d495bd8723d88d18d028101656df27f50279385c7. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3944f5b-007c-4ba4-bfc5-b6acfa7127c1.json and https://artists.proofprofile.net/proofs/artist/a3944f5b-007c-4ba4-bfc5-b6acfa7127c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Daan en Sietze helpen de verzetsgroep [Daan en Sietze-serie, Deel 1 (Onverkort)]
Vier vrienden op het speurderspad (Onverkort)
Daan en Sietze duiken onder [Daan en Sietze-serie, Deel 2 (Onverkort)]
Vechten voor de vrijheid [Daan en Sietze, Deel 3 (Onverkort)]
Noodweer over Nederland [Holland onder het hakenkruis, Deel 1 (Onverkort)]