Signing Operations

1

Input Message and Nonce Generation

User enters plaintext message. A UUID v4 nonce is auto-generated (can be refreshed). SHA-256 hash displays in real-time.

Sign Message

Message

Nonce (UUID)

Input

SHA-256 Hash

Real-time Computation

            0x7f2a5c8b1d4e9a3f6c8e2b5d7a1c4f8e9b2d5a7c
          

Concatenated: message|nonce

Hash

2

Signature Display and Server Submission

After signing, the DER-encoded signature is displayed as uppercase hex. If a signing server URL is configured, user can submit via "Submit" button.

Signed

Signature (DER)

            3045022100f7a8b2c9d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9
          

✓ Copied to clipboard

Result

Server Submit

Nonce:

a1b2c3d4-e5f6-47a8-b9c0-d1e2f3a4b5c6

Signature:

0x3045022100f7a8...

Submit to Server

1

Network Selection and Gas Oracle

User taps the network indicator bar to open `NetworkSelectorSheet`. Live gas data (Safe/Standard/Fast), ETH price, and account balance are fetched from Etherscan v2 API.

Sign Transaction

Ethereum Mainnet (1)

Safe: 18.5 gwei

Standard: 21.3 gwei

Fast: 25.7 gwei

ETH/USD: $3,485.23

Balance: 1.25 ETH

Network & Gas

Select Network

Ethereum Mainnet ✓
Base
Arbitrum One
Polygon
Sepolia (testnet)

Networks

2

Transaction Fields and Preview

User configures transaction fields: nonce, to address, value, gas limit, gas price, priority fee, data. A JSON preview is rendered below the form.

Tx Fields

Nonce To Address Value (ETH) Gas Limit Gas Price (gwei)

Inputs

Transaction JSON

{
  "nonce": "0x5",
  "to": "0x742d35Cc6634C0532925a3b844Bc...",
  "value": "0x6f05b59d3b20000",
  "gasLimit": "0x5208",
  "gasPrice": "0x4f9c90800"
}
          

Preview

1

QR Export Sheet with Multi-Part Animation

The "Export" button opens `ExportKeySheetView`. Multi-part QR codes auto-cycle with dot indicators. Transfer passphrase is displayed for secure communication.

Export Key (QR)

▦▦▦▦▦
▦ ▦▦ ▦
▦▦▦▦▦

Part 1 of 3

● ○ ○

Passphrase:

QR Export

Export Destinations

🔐 Secure Enclave

✓ Saved

☁️ iCloud Keychain

Available

💾 Files

Available

Backup Destinations

2

QR Scanner and Reassembly

Opening "QR Code" mode in `CreateKeySheetView` opens `QRScannerView`. Camera scans multi-part QR codes. Progress displays "X of Y parts scanned" with dot indicators.

Scan QR Codes

[Camera Preview]

Point at rotating QR codes

Camera

Scanning Progress

2 of 3 Parts Scanned

🟢 🟢 ⚪

Part 1: ✓

Part 2: ✓

Part 3: pending

Medium haptic on each scan

Progress

Passphrase Prompt

All parts scanned!

Enter transfer passphrase to decrypt:

Decrypt

1. Message Signing Workflow

2. Transaction Signing Workflow

3. QR Export and Import Cycle