Posthum is a black metal band from Nannestad, Norway. The band was founded in 2004 by Jon Kristian Skare (guitar, bass, vocals) and Morten Edseth (drums). The music is more to the ambient/progressive
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 0x0101fa64e47b0d748029fa1fe2d6e0c042e72b3d4b5366b0676295a1cb149609. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22ba87b1-4ae6-4e29-9ba8-da0dee4de900.json and https://artists.proofprofile.net/proofs/artist/22ba87b1-4ae6-4e29-9ba8-da0dee4de900.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).