Contakt is the fifth studio album by the Norwegian urban music duo Madcon. It was released on 21 June 2012. The album entered the Norwegian Albums Chart at number 18. This is the first album recorded
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 0x93f6df358efd9ea8f800a6ea6133eaef3c70253d5fe421586e8b95507970ba94. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3fe47991-b847-4cd9-be05-10ccb9ea18c0.json and https://artists.proofprofile.net/proofs/artist/3fe47991-b847-4cd9-be05-10ccb9ea18c0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.