/**
 * Get the EVM private key. Priority:
 * 1. EVM_PRIVATE_KEY env var (allows override / server deployments)
 * 2. OS keychain (macOS Keychain, Windows Credential Manager, Linux Secret Service)
 *
 * Also checks the legacy `moltiverse-mcp` keychain service as a fallback so
 * existing users migrating from moltiverse-mcp don't have to re-run setup.
 */
export declare function getPrivateKey(): Promise<string | null>;
export declare function storePrivateKey(key: string): Promise<void>;
export declare function deletePrivateKey(): Promise<void>;
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