"Applications do not necessarily need control over a user's assets in order to provide useful financial functionality."
Torsten Stüber, Engineering Director at Parity, speaking at Web3 Summit 2026, described an application architecture built around a deliberate separation between products and the identities, assets, and network connections of their users.
Products operate inside isolated sandboxes. Instead of receiving direct access to keys or funds, they interact with external infrastructure through Trinity, while the host retains responsibility for functions such as transaction signing. Accounts can also be derived from a common identity without making activity across different products readily linkable.
The privacy model extends to payments. Stüber described Fungibility as closer to physical cash than a conventional blockchain account: value can be represented through separate coins rather than a single publicly observable balance, with the host supporting payment recovery.
The structural takeaway:
✅ Applications separated from direct control of user assets
✅ Identity architecture reducing cross-product linkability
✅ Private payments moving beyond publicly traceable account balances
✅ Host infrastructure becoming the intermediary between products and networks
The broader implication is that decentralized application design may increasingly separate functionality from custody. Rather than giving every product direct access to identities, accounts, and assets, architectures like this move sensitive capabilities into a shared host layer, potentially changing how privacy, security, and application interoperability are designed across Web3.
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