What is Self-Custody in DeFi?
Self-custody means the user holds full private keys to their digital assets without relying on a third party. In Islamic decentralized finance, self-custody aligns with the principle of true ownership, reducing gharar (uncertainty) and complying with Shariah requirements for clear property rights. Examples include wallets like MetaMask or Trust Wallet where the user is solely responsible for asset security.
What is Platform Custody in DeFi?
Platform custody involves a third party (e.g., a DeFi platform or exchange) holding the private keys on behalf of the user. In Islamic finance, this may raise Shariah issues as it transfers actual control to the platform, potentially leading to gharar or even riba if the platform lends assets without explicit permission. The user also bears platform risks (e.g., hacks or mismanagement), which may conflict with Islamic principles of trustworthiness.
The Core Difference: Ownership vs. Control
With self-custody, the user owns and directly controls the asset (owner and trustee of oneself). With platform custody, the user legally owns the asset but the platform has effective control, resembling the concept of a deposit (wadi'ah) in Islamic jurisprudence but with additional risks. From a Shariah perspective, self-custody is closer to complete ownership (tamleek) while platform custody may be considered agency or trust, requiring transparency and compliance to prevent harm.
Shariah Implications of Each Model
Self-custody complies with the principle "al-kharaj bi al-daman" (profit from liability) as the user bears full asset risk. Platform custody may involve gharar because the user lacks control and faces potential platform hacks causing unpredictable losses. Some platforms also use deposited assets without permission, which constitutes prohibited riba. Therefore, in Qist we adopt self-custody as a foundation for transparency and fairness.
How Qist Applies This
On Qist on Base, we use open, audited smart contracts on BaseScan to enable full self-custody. The user holds their own private keys, and the platform cannot access assets without consent. Assets are stored in transparent smart contracts, with no intermediary control. This fulfills the principle "seller owns the asset" and prevents gharar and riba, while returning surplus to the user and offering a 3-day grace period.
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Informational content only, not financial advice.