Midnight Details Nightmode Design for Private Cross-Chain DeFi

Midnight has introduced Nightmode, a vault design that would let users direct decentralized finance activity on public blockchains while keeping their individual balances private, separating visible transactions from account histories.

Under the design, a user deposits an asset into a vault on its original blockchain. Midnight records a matching claim in a shielded pool, which the user can use to direct activity through connected applications. Withdrawing the original asset requires giving up that private claim. The asset remains on its original network while the corresponding balance is managed on Midnight.

The public transaction does not disappear. A swap through Uniswap on Ethereum would still expose its amount and timing on that network. Nightmode aims to prevent observers from connecting the visible transaction to a particular user’s protected balance and account history.

That distinction limits the privacy Nightmode can provide when an application operates on a public chain. Zero-knowledge proofs and selective disclosure are intended to let authorized parties check required information without seeing the full account record. The design could serve lending, payments and tokenized asset settlement, where private balances and auditable records may both matter.

Sig.Network’s multiparty signing system provides the link to Ethereum activity. It lets a contract on Midnight authorize transactions from an Ethereum account. A threshold of independent signers jointly produces each signature, so no single signer can act alone.

The working demonstration runs on Midnight’s stagenet. It covers Ethereum deposits, Uniswap swaps, supplying assets to Aave and withdrawals. Those demonstrated actions are narrower than the proposed design for activity across connected applications and blockchains.

Midnight has previously described smart-contract privacy that lets applications verify rules without exposing selected user inputs. Nightmode extends that approach to a setup in which the private balance is recorded on Midnight and the related asset stays in a vault on its original chain.

For users of public DeFi applications, the key limit remains the transaction itself: anyone examining Ethereum can see a swap’s size and time. The proposed privacy protection concerns the link between that public activity and the user’s private account record.

A mainnet version is tied to Midnight’s ledger v9 upgrade. EVM NightMode work is listed for the fourth quarter of 2026.