How to Send Crypto from Coinbase Wallet Using a QR Code?

QR Code Integration in Coinbase Wallet

1. Coinbase Wallet supports QR code-based transfers across all major EVM-compatible chains and Bitcoin via its built-in scanner.

2. Users can generate a receive QR code by tapping the “Receive” button on the asset detail screen, which encodes the wallet’s native address for that specific token standard.

3. When sending, the app automatically detects whether the scanned QR code contains an address, a payment request URI, or a multi-chain routing instruction.

4. The scanner validates checksums in real time—Ethereum addresses undergo EIP-55 case-sensitive validation, while Bitcoin addresses are verified against Base58Check or Bech32 standards.

5. If the QR code includes memo or tag fields (e.g., XRP destinations or Stellar account IDs), Coinbase Wallet parses and displays them before confirming the transaction.

Security Layers Behind the Scan

1. Every QR code scan triggers local cryptographic verification before displaying any address information—no raw data is sent to remote servers during parsing.

2. The wallet cross-checks domain ownership if the QR code redirects to a web-based payment request, using TLS certificate pinning and DNSSEC-aware resolution.

3. Transaction previews show full destination address with truncated middle segments—users must manually expand to view complete strings, preventing visual spoofing.

4. If the scanned address belongs to a known scam contract or blacklisted wallet (per Coinbase’s on-device threat feed), the interface halts and displays a red warning banner.

5. Time-bound QR codes—such as those generated for Lightning Network invoices—are rejected if their timestamp exceeds 10 minutes from scan initiation.

Multi-Chain Address Encoding Logic

1. A single QR code may encode different addresses depending on chain context: ETH mainnet, Arbitrum, Base, and Optimism all share the same public key but derive distinct checksummed addresses.

2. Coinbase Wallet decodes embedded chain identifiers (e.g., “eip155:1” for Ethereum mainnet) and auto-selects the correct network before populating the send form.

3. For tokens like USDC, the QR code may embed both ERC-20 and native chain versions—wallet logic prioritizes the version matching the user’s currently selected network tab.

4. Bitcoin QR codes containing Lightning invoice URIs trigger a separate flow that initiates BOLT-11 parsing and channel probing before showing final fee estimates.

5. Solana addresses encoded in QR format include explicit token program IDs; the wallet validates these against known SPL token registries before allowing confirmation.

User Interface Behavior During Transfer

1. After scanning, the amount field remains empty by default—users must enter value manually to prevent accidental over-sends from reused QR codes.

2. Gas estimation appears instantly for EVM chains, pulling live mempool data from Coinbase’s internal RPC cluster without exposing wallet keys.

3. The “Send” button stays disabled until both address validity and balance sufficiency are confirmed locally—no network call determines eligibility.

4. If the recipient address matches a saved contact, the UI overlays the contact name in bold green font above the address preview.

5. On Android devices with NFC enabled, holding the phone near a compatible hardware wallet triggers automatic QR payload handoff instead of camera activation.

Frequently Asked Questions

Q: Does Coinbase Wallet support scanning QR codes that contain multiple addresses?A: No. Each QR code must encode exactly one valid address or payment URI. Multi-address payloads violate BIP-21 and EIP-681 specifications and are rejected outright.

Q: Can I scan a QR code from a screenshot stored in my gallery?A: Yes—but only if the image resolution exceeds 320×320 pixels and contrast meets ISO/IEC 18004 decoding thresholds. Blurry or compressed screenshots often fail checksum validation.

Q: Why does my scanned BTC QR code sometimes show as invalid even though it worked yesterday?A: Bitcoin QR codes with embedded timestamps or block height locks expire after confirmation depth requirements change; Coinbase Wallet enforces strict adherence to current consensus rules.

Q: Is there a size limit for QR codes accepted by Coinbase Wallet?A: Yes. Codes exceeding Version 40 (177×177 modules) are not processed due to memory constraints in the on-device ZXing decoder library.