<![CDATA[This article reconstructs the regulation of crypto assets in Indonesian Muslim marital property through a structured application of qawāʿid al-fiqhiyyah. It argues that economic value does not establish ownership, joint-property status, contractual validity, or Sharia permissibility. A normative legal method combines statutory interpretation, conceptual distinctions, comparative materials, and a sequence linking identified risks to relevant maxims, limiting rules, and contractual consequences. The analysis distinguishes five questions: asset status, lawful entitlement, marital classification, contractual authority, and the permissibility of the particular asset and transaction. Indonesian law already accommodates intangible joint property; the problem concerns specification, evidence, governance, and implementation rather than an absolute legal vacuum. Islamic legal maxims generate duties of disclosure, preservation, accountable management, and differentiated risk allocation, while maqāṣid al-sharīʿah evaluates their effects on wealth protection and family obligations. The resulting normative model contains operational clauses on asset schedules, tracing, consent, secure access, ordinary losses, misconduct, valuation, dissolution, and third-party safeguards. Its application to hypothetical cases demonstrates that private-key control cannot displace marital entitlement and that an agreement cannot validate prohibited investment. The proposed model is a doctrinal design for adaptation to individual circumstances, not an empirically validated instrument or a general fatwa approving cryptocurrency.]]>
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