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Wallet system ​

Summary ​

Crypto wallet with mnemonic generation, Arbitrum Nova transfers, transaction signing, and encrypted persistence. Built on wallet-core C++ bindings with Fennel modules for wallet lifecycle, RPC interaction, and UI dialogs.

Motivation ​

Space needed a built-in wallet for future social/contribution features (one-click tipping, asset distribution) and as a foundation for user-owned services. The wallet-core library provides cross-chain cryptographic operations; the Fennel layer wraps it with application-level wallet management.

Design ​

  • Wallet (wallet.fnl): Core operations — mnemonic generation/validation, Arbitrum Nova account creation, transfer signing (ETH/ERC-20). Exposes validate-mnemonic, generate-mnemonic, create-arbitrumnova, sign-arbitrumnova-transfer.
  • WalletStore (wallet-store.fnl): Encrypted JSON persistence for wallet mnemonics and addresses.
  • WalletManager (wallet-manager.fnl): Lifecycle management — load, create, recover, switch active wallet.
  • WalletRPC (wallet-rpc.fnl): RPC client for chain interaction (balance queries, transaction submission) on Arbitrum Nova chain ID 42170.
  • WalletTxUtils (wallet-tx-utils.fnl): Transaction utilities — ETH/wei conversion, hex/base64 encoding.
  • Dialogs: wallet-create-dialog.fnl, wallet-load-dialog.fnl, wallet-recover-dialog.fnl, wallet-send-dialog.fnl — full UI for wallet operations.
  • WalletView (wallet-view.fnl): Wallet balance and transaction view widget.

Tasks ​

  • [x] wallet-core C++ binding
  • [x] Mnemonic generation (128-bit strength)
  • [x] Arbitrum Nova account creation
  • [x] Transaction signing
  • [x] Encrypted wallet persistence
  • [x] RPC client for chain interaction
  • [x] Create/load/recover/send dialogs
  • [x] Wallet view widget