Technical Architecture
1. Layered Architecture Diagram
A[Off-Chain Data Sources] --> B[Data Lake]
B --> C[Preprocessing Pipeline]
end
subgraph AI Layer
C --> D[Federated Learning Nodes]
D --> E{PVE Engine}
E --> F[Risk Model]
E --> G[Valuation Model]
end
subgraph Blockchain Layer
H[Base Chain] --> I[Property NFTs]
I --> J[ERC-721R Registry]
H --> K[DeFi Gateway]
end
subgraph Application Layer
L[Portfolio Dashboard] --> M[Auto-Rebalance Module]
L --> N[Yield Simulator]
K --> O[DEX Aggregator]
end
F --> H
G --> H
M --> K
2. Core Component Interaction Process
Data Flow
1. Offline Data Collection
• Sources: Satellite imagery (eg. Sentinel-2 API), government open data (eg. Census.gov), real estate MLS database, IoT sensor streams
• Protocol: Standardize data format using Chainlink external adapters
2. AI Processing Layer
• Federated Learning: 10 geographically distributed nodes with training data privacy protected by SGX Enclave
• Model Output: Generate a JSON-format oracle report every hour, including:
{
"property_id": "0x...",
"valuation": {"base": 500000, "bull": 550000, "bear": 480000},
"risk_score": 0.23,
"timestamp": 1717027200
}
3. On-chain Integration
Base Chain Contracts:
• PropertyFactory.sol:
Mints ERC-721R NFTs and binds them to legal SPV files (using IPFS CID).
• PVEOracle.sol
: Verifies AI oracle signatures and updates token prices.
DeFi Interaction:
• Uses a custom AMM curve on Balancer V3 to adjust liquidity pool weights based on risk scores.
3. Key Protocol Descriptions
1. ERC-721R Extension Standard
// Legal Metadata Extension
struct LegalWrapper {
address spvAddress;
string jurisdiction;
bytes32 insuranceHash;
}
mapping(uint256 => LegalWrapper) public propertyLegalInfo;
// Revenue Distribution Logic
function distributeYield(uint256 tokenId) external {
require(msg.sender == AI_Oracle, "Unauthorized");
uint256 yield = calculateYield(tokenId);
ERC20(USDC).transfer(ownerOf(tokenId), yield);
}
2. AI Oracle Network
a. Node Architecture:
• Utilizes a Threshold Signature Scheme (TSS), requiring signatures from 5 out of 8 nodes to update the price.
• Penalty Mechanism: Nodes that make incorrect predictions more than 3 times will have their collateral slashed.
b. Data Validation:
• Satellite imagery is validated for building changes using TrueBit.
• Rental data is indexed for off-chain events via The Graph.
4.Security Architecture
Data Tampering
Data source SSL fingerprint verification + IPFS content addressing
Model Poisoning
Federated learning gradient encryption + Differential privacy
Oracle Manipulation
Multi-signature verification + 30-minute price update delay
Contract Vulnerabilities
Formal verification (Certora) + Monthly third-party audits
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