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LCT Documentation Index

Last Updated: February 5, 2026

LCT (Linked Context Token) documentation is distributed across multiple files. This index provides a roadmap.

Start Here

Document Purpose Audience
LCT_UNIFIED_PRESENCE_SPECIFICATION.md Canonical spec for cross-system LCT format Implementers
GLOSSARY.md Quick definition of LCT and related terms Everyone
web4-standard/core-spec/LCT-linked-context-token.md Core protocol specification Protocol designers

Specifications

Core Protocol

File Description
web4-standard/core-spec/LCT-linked-context-token.md Original LCT specification
web4-standard/core-spec/multi-device-lct-binding.md Multi-device binding protocol (Jan 2026)
LCT_UNIFIED_PRESENCE_SPECIFICATION.md Cross-system presence format (Dec 2025)
web4-standard/implementation/act_deployment/LCT_SPECIFICATION.md ACT blockchain integration spec

Permissions & Authorization

File Description
LCT_UNIFIED_PERMISSION_STANDARD.md Permission model specification
archive/game-prototype/engine/LCT_DATABASE_SCHEMA.md Database schema for LCT storage (archived)

Integration Patterns

File Description
web4-standard/implementation/LCT_MINTING_PATTERNS.md Patterns for creating new LCTs
lct_witnessed_presence.md How presence accumulates through witnessing
entity_binding_hierarchy.md Multi-level binding patterns
binding_pairing_witnessing_broadcast.md Relationship mechanisms

Implementation

Game Engine (Archived - was prototype, now see 4-life)

File Description
archive/game-prototype/engine/lct.py Core LCT class
archive/game-prototype/engine/lct_identity.py Identity management
archive/game-prototype/engine/lct_permissions.py Permission checking
archive/game-prototype/engine/lct_unified_permissions.py Unified permission model
archive/game-prototype/engine/identity_registry.py LCT registry
archive/game-prototype/engine/identity_consensus.py Consensus on identity state
archive/game-prototype/engine/identity_stake_system.py Economic Sybil resistance

SAGE Integration

File Description
archive/game-prototype/engine/sage_lct_integration.py Edge device LCT patterns
archive/game-prototype/engine/sage_web4_bridge.py Cross-system coordination

Reference Implementation

File Description
web4-standard/implementation/reference/authorization_lct_integration.py Authorization + LCT integration

Phase Completion Reports

These documents track the implementation progress of the LCT presence system:

Phase Document Status
Phase 1 Core identity Complete
Phase 2 LCT_IDENTITY_PHASE2_COMPLETE.md Complete
Phase 3 LCT_IDENTITY_PHASE3_COMPLETE.md Complete
Phase 4 ATP Integration Complete
E2E LCT_E2E_INTEGRATION_COMPLETE.md Complete

LCT URI Format

The unified LCT format for cross-system presence:

lct://{component}:{instance}:{role}@{network}

Examples:

lct://sage:thor-001:expert@mainnet      # SAGE expert on mainnet
lct://act:validator-5:node@testnet      # ACT validator on testnet
lct://web4:society-alpha:member@local   # Web4 society member locally

Components:

  • component: System type (sage, act, web4)
  • instance: Specific instance identifier
  • role: Functional role within the system
  • network: Network/environment (mainnet, testnet, local)

Demo Scripts (Archived)

Script What It Tests
archive/game-prototype/run_lct_e2e_integration_test.py Full LCT presence system
archive/game-prototype/run_sage_lct_integration_test.py SAGE edge device patterns
archive/game-prototype/run_identity_consensus_test.py Identity consensus

Related Documentation

Canonical specification: LCT_UNIFIED_PRESENCE_SPECIFICATION.md