# 8.4. Program Agents

The replica platform architecture includes servers that monitor the blockchain and register state changes in the AWS infrastructure.

Changes are propagated to the backend by the API, and the centralized database updarecordords so that the front end can import recent changes and display them according to the players and users on the sandbox platform.

These state changes include the transfer of ownership from tokens (SECTOR, ASSET, or REPL & LICA).

In addition, various situations trigger external data entry for our smart contracts: Data received as input is always deleted and multiple layers of security are implemented to ensure protection. Our wise contract was duly audited.

● SECTOR Sale Setup: Submit the SECTOR configuration to each new sales contract at deployment.

● SECTOR Sale: Buyer submits options including payment, then Land is cast as per contract. We provide a map of Universe Map so that buyers can easily choose SECTOR.

● SECTOR Sale Stable Oracle: No Oracle system transfers information to smart contracts. Instead, we use the MakerDAO median, which receives updates from Oracle and estimates the median price. Dollar: https://developer.makerdao.com/feeds/

● Asset Sales Settings: o The creator submits the 2D or 3D model to the backend and hashes the results to submit to the smart contract. As a result, tokens listed in the smart contract are manufactured. o When the manufacturer submits a sign stating the selling price, the backend stores it.

● Asset Sale: Buyer submits payment for a specific token to Smart Contract with seller's signature. Receive tokens as an exchange.
