Based on your description, here's a refined architecture for your secure wallet system, focusing on a private server acting as a relay and validation chokepoint between private testnets and the public network:
Private Testnets:
Set up private testnets (or local forks of the mainnet) for wallet and smart contract development, testing, and transaction initiation.
Access to these private testnets is restricted to authorized parties only.
Private Relay Server:
Establish a private server that listens for transactions from the private testnets.
This server acts as an intermediary between the private testnets and the public network, providing a central chokepoint for transaction validation and control.
The server should be secured following best practices, including:
Running on a dedicated, hardened machine.
Using encrypted communication channels (e.g., VPN, TLS) for interactions with private testnets and the public network.
Implementing strict access controls and monitoring.
Regularly updating and patching the server to protect against known vulnerabilities.
Transaction Validation and Sanity Checks:
Configure the private relay server to validate transactions received from the private testnets before forwarding them to the public network.
Implement sanity checks, such as:
Verifying transaction format, signatures, and nonces.
Checking for and preventing transaction replay attacks.
Ensuring that transactions comply with predefined rules and policies (e.g., rate limits, value thresholds).
Monitoring for and flagging suspicious activities or patterns.
Transaction Freezing and Control:
Implement a mechanism to freeze or delay suspicious transactions, allowing for manual review and intervention if necessary.
Maintain an allowlist and denylist to control which addresses or transactions are permitted or blocked.
Secure Transaction Forwarding:
After successful validation and sanity checks, the private relay server forwards transactions to the public network.
To preserve privacy and security, consider using transaction relay services or privacy-focused solutions (e.g., mixers, ring signatures) when forwarding transactions.
Monitoring and Alerts:
Set up real-time monitoring and alerting systems on the private relay server to detect and respond to:
Suspicious activities or transactions.
Unauthorized access attempts.
Potential server compromises.
Regular Security Audits and Updates:
Conduct regular security audits and penetration testing on the private relay server and associated infrastructure to identify and address potential vulnerabilities.
Keep the server software and dependencies up-to-date to protect against known security threats.
By implementing this architecture, you create a more secure wallet system with a central chokepoint for transaction validation and control. While no system is entirely immune to compromise, this approach significantly reduces the risk of exposing user wallets directly to potential threats.
Based on your description, here's a refined architecture for your secure wallet system, focusing on a private server acting as a relay and validation chokepoint between private testnets and the public network:
By implementing this architecture, you create a more secure wallet system with a central chokepoint for transaction validation and control. While no system is entirely immune to compromise, this approach significantly reduces the risk of exposing user wallets directly to potential threats.