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Engineering Case Study
Karen: Autonomous Agentic Wallet Runtime for Solana
Provisions secure, non-custodial Turnkey enclaves enabling AI agents to hold SOL, execute transactions, and stake autonomously.
Turnkey HSM Enclaves
Enclave Security
Non-Custodial Auto-Signing
Execution
Policy Spend & Target Controls
Guardrails
Solana AI Agent Runtime
Ecosystem
The
Challenge
Autonomous AI agents operating on-chain face a fundamental security dilemma: storing private keys in application memory exposes funds to memory leaks and key theft, while requiring manual human approvals destroys agent autonomy.
The
Strategy
I built Karen as an open-source agentic wallet runtime using Turnkey Secure Enclaves:
1. Turnkey HSM Secure Enclave Provisioning
Karen programmatically provisions Solana keypairs inside Turnkey Hardware Security Modules (HSM). The AI agent executes transactions using cryptographic signing credentials without ever exposing raw private keys in memory.
2. Execution Guardrail Policy Engine
Enforces execution boundaries prior to signing transactions:
Terminal Workspace// Transaction Guardrail Policy Validator export function validateTransactionPolicy(tx: Transaction, policy: PolicyRules): boolean { if (tx.amount > policy.maxSpendPerTx) return false; if (!policy.allowedPrograms.includes(tx.programId.toBase58())) return false; return true; }
3. Autonomous On-Chain Operations
Supports automated Devnet validator staking delegation, SPL token wrapping, and account rent reclamation, paired with a web control dashboard.
Technology Infrastructure
Solana Web3.jsTurnkey SDKTypeScriptRustNode.jsTailwind CSS 4
Key
Outcomes
- Outcome 01
Programmatically provisioned non-custodial Turnkey enclave wallets for autonomous AI agents.
- Outcome 02
Automated payload-driven transaction signing without requiring human approval bottlenecks.
- Outcome 03
Enabled native Solana validator staking, token swaps, and account rent reclamation for agents.
- Outcome 04
Constructed a real-time web control dashboard for monitoring agent balances and transaction guardrails.