Ria Valk (born 11 February 1941 in Eindhoven) is a Dutch singer, presenter, actress, lyricist and painter. She is best known as a singer of cheerful and comical songs. She acted in the TV series Zeg '
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 0x37a1e9ce463f3f5e0ce698464d2f546bc9871281c7834ef4c38e9ecddaed674c. 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/053e21e8-457f-46f8-a01d-540329a4740f.json and https://artists.proofprofile.net/proofs/artist/053e21e8-457f-46f8-a01d-540329a4740f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).