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title Trust Infrastructure Stack
description Layered architecture — applications, trust intelligence, PTI core, and data sources.
sidebar_position 2
slug /pti/architecture-stack/
displayed_sidebar ptiSidebar
hide_title true
hidePtiSpecIdentity true

Reference architecture

Trust Infrastructure Stack

How applications, intelligence services, PTI core contracts, and source data compose into portable trust infrastructure.

Informative RFC-001

This page is an informative stack view. Normative requirements are in RFC-001 Architecture and Specification v1.0.

Diagram 1: Trust infrastructure stack

flowchart TB
  subgraph apps [Applications]
    L[Lending]
    E[Employment]
    C[Commerce]
    H[Housing]
    COM[Communities]
  end

  subgraph intel [Trust intelligence layer]
    TP[Trust profiles]
    TG[Trust graph]
    TR[Trust resolution]
    TA[Trust analytics]
  end

  subgraph pti [PTI layer]
    TE[Trust events]
    TC[Trust contexts]
    TX[Trust exchange]
    GV[Governance]
  end

  subgraph sources [Data sources]
    TXN[Transactions]
    REL[Relationships]
    ACT[Activities]
    VER[Verifications]
  end

  sources --> pti
  pti --> intel
  intel --> apps
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Layer Role
Applications Decision workflows — underwriting, hiring, tenancy, merchant onboarding
Trust intelligence Context scores, graph traversal, identity resolution, explainability
PTI layer Normative events, contexts, exchange rules, consent and audit
Data sources Raw activity from partners, registries, credentials, and verifications

Diagram 2: Traditional vs PTI model

flowchart TB
  subgraph traditional [Traditional model]
    direction TB
    P1[Person] --> I1[Individual institution]
    I1 --> R1[Isolated reputation / file]
  end

  subgraph pti_model [PTI model]
    direction TB
    P2[Person] --> PROF[Portable trust profile]
    PROF --> EC1[Lending ecosystem]
    PROF --> EC2[Employment ecosystem]
    PROF --> EC3[Commerce ecosystem]
    PROF --> EC4[Community ecosystem]
  end
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Model Characteristic
Traditional Trust accumulates inside one institution; portability is manual and lossy
PTI Trust profile persists across ecosystems with context isolation and provenance

Component map

Stack element PTI document
Trust events Trust events · RFC-003
Trust contexts Trust contexts · RFC-002
Trust exchange Trust exchange · RFC-006
Trust graph Trust graph · RFC-005
Trust resolution Trust resolution · RFC-011
Lookup API Trust APIs · RFC-004
Governance RFC-007 · Specification governance

Trust flow (end-to-end)

flowchart LR
  Producer[Trust producer] --> Events[Trust events]
  Events --> Exchange[Trust exchange]
  Exchange --> Graph[Trust graph]
  Graph --> Engine[Intelligence engine]
  Engine --> Consumer[Trust consumer]
  Registry[Trust registry] -.-> Exchange
  Registry -.-> Engine
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See Trust flow for step-by-step detail.

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