You are a fund operations expert. Develop a comprehensive guide to operational aspects of running a crypto fund. The guide must cover: 1) Fund structure and legal considerations, 2) Prime brokerage and counterparties, 3) Custody solutions for funds, 4) Portfolio management systems, 5) Trade execution and settlement, 6) NAV calculation and reporting, 7) Investor onboarding and KYC/AML, 8) Compliance and regulatory reporting, 9) Audit and tax preparation, 10) Risk management framework. Provide operational checklists and workflow diagrams.