Hastur (known by the epithets The Unspeakable One, The King in Yellow, Him Who Is Not to be Named, Assatur, Xastur, H'aaztre, Fenric, or Kaiwan) is an entity of the Cthulhu Mythos. Hastur first appea
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 0x63a75393f2af11df5c30964fec6c9a21396cd83fbd3dd29643d88e38d1fb098d. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e127d0dc-f921-453a-95fe-f308d418b4c9.json and https://artists.proofprofile.net/proofs/artist/e127d0dc-f921-453a-95fe-f308d418b4c9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).