Karin Ström (born 1977) is a Swedish singer and writer. Music Born in the small town of Kristianstad, Sweden, as the daughter of poet Eva Ström, Karin relocated to London in 1997 where she started to
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70800c5cfd9a77d9f1736b3409a1e15390f2ad44842509a3c07b1243c2e5e3c4. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cbe5c02-b72e-47e1-a9fb-6c16457fbb66.json and https://artists.proofprofile.net/proofs/artist/4cbe5c02-b72e-47e1-a9fb-6c16457fbb66.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).