Siw Gunnel Margareta Malmkvist (born 31 December 1936) is a Swedish schlager singer and actress popular in Scandinavia and West Germany (today's Germany).Siw Malmkvist - Information på NE.se Siw Malm
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 0x770088a8013fb140de7b9a7f6313255ed2da1dc5a1794d4ef8aef37d94300a0d. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f494d9d-0eee-4e88-9f87-762805be0262.json and https://artists.proofprofile.net/proofs/artist/9f494d9d-0eee-4e88-9f87-762805be0262.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).