Delft University of Technology This document specifies trust computation, audit recording, delegation, and key succession mechanisms for the TrustChain bilateral ledger protocol (draft-pouwelse-trustchain-01). The base protocol specifies a bilateral block structure for recording pairwise interactions but explicitly leaves trust computation out of scope. This document fills that gap by defining: (1) a canonical hash computation for cross-implementation compatibility, (2) an interaction graph constructed from half-block pairs, (3) pluggable Sybil-resistant path-diversity algorithms over the interaction graph -- maximum network flow (Edmonds-Karp) and personalized random walks (MeritRank), (4) a multiplicative trust score combining connectivity, chain integrity, and interaction diversity, (5) an audit block type for single-player recording of agent actions as a signed, hash- chained log when no counterparty is available, (6) a delegation protocol for transitive authority with budget splitting and revocation, (7) a bilateral succession protocol for key rotation, and (8) a chain anchoring mechanism that binds chain heads to external time-stamping authorities for evidence-grade deployments.