Æternity Stack

• Level One: FATE VM

• Level Two: Smart Contracts

• Level Three: æternity Nodes

• Level Four: æternity client APIs

• Level Five: End-User Applications

Level One: FATE VM

• Custom-built virtual machine for æternity

• Efficient execution of smart contracts

• Strong type system for enhanced security

• Direct integration with blockchain primitives

Level Two: Smart Contracts

• Sophia programming language

• Functional programming paradigm

• Built-in state channels support

• Oracle integration

sophiaCopy// Example Sophia contract
contract SimpleStorage =
  record state = { value : int }
  
  entrypoint init() = { value = 0 }
  
  stateful entrypoint set(x : int) = 
    put(state{value = x})

Level Three: æternity Nodes

• Erlang-based implementation

• Bitcoin-NG consensus mechanism

• State channels for scalability

• Native oracles and naming system

Level Four: æternity Client APIs

• REST API for node interaction

• WebSocket API for real-time updates

• SDK methods for common operations

javascriptCopy// SDK usage example
const { Node, Universal: Ae } = require('@aeternity/aepp-sdk')

const client = await Ae({
  nodes: [{
    name: 'testnet',
    instance: await Node({
      url: 'https://testnet.aeternity.io'
    })
  }]
})

Level Five: End-User Applications

• Web-based æpps

• Mobile applications

• Integration with existing systems

• State channel applications