Haunt was a straightforward but engagingly irreverent text-based mainframe computer game. It was created in OPS4 language in 1979 by John E. Laird. In Haunt, the player explores a haunted house and e
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 0xa6ad7c1f884e4b391e95558e5ed1bbcb14f7c02aae5210fbb096e26d62c61571. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d09fbb4b-e586-4953-a89f-3a0ad8d2cade.json and https://artists.proofprofile.net/proofs/artist/d09fbb4b-e586-4953-a89f-3a0ad8d2cade.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).