# Technical Architecture 

**Overview and Design Principles** \
PropChain’s technical architecture is meticulously designed to deliver exceptional scalability, interoperability, security, and modularity. Built to support rapid integration, expansion, and innovation our architecture ensures robust operational efficiency and compliance. \
 \
**Blockchain Layer** 

* Ethereum Mainnet – primary network for PropYield (On-chain) and PROPC token including vesting contracts, staking and CCIP integration - High adoption, strong security, rich tooling, and deep DeFi integrations (PoS) 
* Polygon PoS – used for deploying real estate tokens following the CMTAT standard - Lower gas fees, Ethereum compatibility, supports high-volume operations for real estate token minting (PoS) 
* Solana – connected via Wormhole for cross-chain bridging of PROPC - Fast finality and low transaction cost; used for targeted cross-chain interoperability (PoH & PoS) 

**Smart Contract Infrastructure** \
Smart contracts automate complex processes, significantly enhancing efficiency, reducing errors, and ensuring compliance.  

 **Prochain core contracts include:** 

* PROPC Token: ERC20 implementation on Ethereum  
* Staking Contracts:  
  * Pool-based staking with fixed APYs, penalty structure, and claim locks  
  * Multi-stake support, dynamic penalties (decreasing over time), min/max thresholds, VIP pool access  
* Vesting Contracts: Custom-built contracts for phased token distribution with TGE, ticks, and admin-managed liquidity  
* Cross-chain Bridge: Wormhole bridge to Solana for token mirroring  
* Swap Integration: Chainlink CCIP integrated with xSwap for token swaps across chains  \
   

**Off-Chain Integrations:** 

* Analytics Integration: CoinGecko and other market data feeds (read-side) 
* Oracles (Planned): Chainlink Data Feeds and potential custom off-chain valuation for real estate 

 

**Audits and Security**  

* Audit Partner - Zokyo: Comprehensive smart contract audit including:  
  * Line-by-line manual code review  
  * Cross-comparison with leading DeFi contracts  
  * Foundry-based fuzz testing and integration test coverage  
  * Attack vector simulation and risk categorization (Critical to Informational)  
  * 100% resolved actionable issues in the report  
  * Code testability coverage of 96% (industry-leading)  \
      
* **Practices**:  
  * Modular contract structure for upgradeability and minimal risk  
  * Reentrancy guards, SafeMath, SafeERC20 utilities  
  * PlatformAccessController for RBAC enforcement in vesting/staking   


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