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Wallet Features ​

Implemented ​

  • Wallet-core integration with Fennel bindings (wallet-core, HDWallet, JSON signing).
  • Arbitrum Nova wallet creation:
    • Generate or supply mnemonic.
    • Derive address from BIP-44 path m/44'/60'/0'/0/0.
  • Wallet persistence:
    • Metadata stored under appdirs.user-data-dir (wallets/metadata.json).
    • Mnemonic stored in keyring by wallet id.
    • Active wallet tracked in wallets/active.json.
  • Wallet view (HUD):
    • Show active wallet name, coin, address, and balance.
    • Copy address to clipboard.
    • Receive QR code for the address.
    • Balance refresh with explicit reload button.
  • Wallet dialogs:
    • Create wallet dialog (name + mnemonic).
    • Load wallet dialog (list of saved wallets).
    • Send dialog (Arbitrum Nova only):
      • Recipient, amount (ETH), optional data hex.
      • Auto-fetch nonce, gas price, and gas limit.
      • Sign via HDWallet:sign-json and send via RPC.
      • Shows status + transaction hash.
  • RPC integration (Arbitrum Nova):
    • eth_getBalance, eth_getTransactionCount, eth_gasPrice, eth_estimateGas, eth_sendRawTransaction.
    • Default endpoint: https://nova.arbitrum.io/rpc.

Current Limitations ​

  • Send flow uses legacy gas price only (no EIP-1559 fields).
  • Only Arbitrum Nova is exposed in app UX (wallet-core bindings also expose Arbitrum One and Ethereum address derivation, but UI and RPC are Nova-focused).
  • No transaction history, receipts, or pending tracking.
  • No token support (ERC-20/721/1155), no fiat conversions.
  • No address book or contact tagging.

Roadmap Ideas ​

EIP-1559 Support (planned) ​

Add inputs and signer wiring for EIP-1559 transactions:

  • UI inputs in Send dialog:
    • max_fee_per_gas (max fee)
    • max_priority_fee_per_gas (max priority fee)
    • Optional toggle to use legacy gas price vs EIP-1559 fields.
  • RPC additions:
    • eth_feeHistory to propose base fee / priority fee defaults.
    • eth_maxPriorityFeePerGas as an optional shortcut.
  • Signer wiring:
    • Extend the JSON payload used by TWAnySignerSignJSON to include maxFeePerGas and maxInclusionFeePerGas (priority fee) for the Ethereum signer.
    • Set transaction mode to EIP-1559 (wallet-core Ethereum proto supports this via TransactionMode::Enveloped).
    • Ensure the signer path remains Arbitrum Nova-compatible (same EVM signing rules).

Additional Features ​

  • Chain selector (Arbitrum One, Arbitrum Nova, Ethereum mainnet/testnets).
  • Address book and saved recipients.
  • Transaction history + receipts with status updates.
  • Token balances and transfers (ERC-20, ERC-721, ERC-1155).
  • Multiple accounts per mnemonic (indexing beyond m/44'/60'/0'/0/0).
  • QR encoding of payment requests (amount, memo) and configurable URI schemes.
  • Hardware wallet support (Ledger, Trezor) via wallet-core if supported.
  • Optional encrypted file storage for mnemonics (in addition to keyring).