Elysium

Elysium is a Swiss-built keyless wallet. There is no seed phrase to copy: the private key is assembled on demand by a multi-factor algorithm at signing time and is not persisted afterwards. It supports Bitcoin, the Lightning Network, Liquid and Polygon and focuses on everyday bitcoin and stablecoin payments, for people new to self-custody and small merchants.

Key shares are split between the device secure area and encrypted cloud fragments, and recovery rebuilds them from a combination of device, email and biometrics, so exposure of any single element is not enough to reconstruct the key. Transactions are intent-based: the user states a goal, such as converting a balance and moving it to another chain, and the wallet performs the swap, wrapping and bridging steps. In 2025 the team was acquired by Blockstream, and the wallet technology was folded into that company's wallet and infrastructure line.