De Press is a Polish-Norwegian rock band founded in Oslo in 1980. They were among the leading Norwegian new wave bands, and also gained a following in Poland. History The original De Press had the
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 0xe4efe8c5a965ca28f2718de111b3af3819310325fe98dc1bf39705e6481b4b19. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c9a4a1e7-d47b-4129-9c6c-cf1d0078e4bb.json and https://artists.proofprofile.net/proofs/artist/c9a4a1e7-d47b-4129-9c6c-cf1d0078e4bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).