# Architecture

- [Chain Layer](/trex/architecture/chain-layer.md): Scaling with Ethereum security
- [Persona Layer: Passport, Badges, Validators](/trex/architecture/persona-layer-passport-badges-validators.md): Passport, badges, and validators
- [Passports](/trex/architecture/persona-layer-passport-badges-validators/passports.md): The anchor of identity
- [Badges](/trex/architecture/persona-layer-passport-badges-validators/badges.md): The proof of activity
- [Validators](/trex/architecture/persona-layer-passport-badges-validators/validators.md): The engines of trust
- [Builder & Activation Layers](/trex/architecture/builder-and-activation-layers.md): From integration to applications.
- [Builder Layer](/trex/architecture/builder-and-activation-layers/builder-layer.md): SDKs, APIs, and open contracts.
- [Activation Layer](/trex/architecture/builder-and-activation-layers/activation-layer.md): Matching, recommendations, and services.