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Purpose

SignatureDepositQueue extends SignatureQueue to enable instant deposit of assets into a vault, bypassing the standard on-chain DepositQueue mechanism. It leverages off-chain approvals signed by a trusted consensus group, using EIP-712 or EIP-1271-compliant signatures, to authorize asset inflows and minting of vault shares. This contract is optimized for high-trust environments requiring immediate asset onboarding while maintaining on-chain price safety guarantees.

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Key Features

  • Instant deposit execution with no queuing delay
  • EIP-712 signed orders with nonce-based replay protection
  • Vault share minting at off-chain pre-agreed price
  • Fully integrated with vault accounting and share manager
  • No deposit fee applied (unlike possible fees in DepositQueue)

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Workflow

  1. A consensus group signs an Order authorizing a user deposit:
    • Includes asset amount (ordered) and shares to mint (requested)
    • Binds the request to a specific queue and vault
    • Includes a nonce and expiration timestamp
  2. User submits the order on-chain by calling deposit function:
    • The contract validates the order using signatures and price logic
    • Receives tokens from the user
    • Transfers these tokens to the vault
    • Mints shares to the specified recipient
    • Updates vault internal balance and executes post-deposit hook

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Function: deposit

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Parameters:

  • order: A signed Order struct including deposit parameters
  • signatures: Signatures from the off-chain consensus validating the order

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Steps:

  1. validateOrder(...):
    • Confirms order is not expired
    • Confirms order is intended for this queue
    • Confirms correct asset, caller, and nonce
    • Validates off-chain signatures
    • Computes and validates asset/share price using vault oracle
  2. Increments the caller’s nonce to prevent replay
  3. Transfers order.ordered assets from the caller to this contract
  4. Transfers these assets into the vault
  5. Calls vault.callHook(...) for any optional strategy logic
  6. Notifies the vault’s RiskManager of the new deposit
  7. Mints order.requested shares to order.recipient
  8. Emits OrderExecuted event

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Security Considerations

  • Consensus signatures are required to prevent unauthorized deposits
  • Oracle validation ensures price sanity even in trusted setups
  • Replay protection enforced using per-user nonces
  • No deposit can proceed if:
    • Asset or queue mismatch
    • Caller mismatch
    • Nonce is reused
    • Off-chain price is out of oracle bounds