TIBET Causal Time Substrate

This document describes the TIBET Causal Time Substrate, a forward- only causal ordering model for identity-bound distributed systems. TIBET does not treat wall-clock time as the primary ordering primitive. Instead, it uses a cryptographically bound logical-time structure encoded through append-only linkage, monotonic generation counters, and signed causal references. External wall-clock sources, including NTP, RFC 3161 timestamping services, Roughtime, GNSS, or public ledger timestamps, are treated as auxiliary alignment anchors rather than as the constitutive source of event order. The core claim is simple: TIBET is a forward-only causal substrate that enables recovery and reversibility without rewriting history.