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Blockchain - Wallet#

Taking Phantom Wallet as an Example#

1. Introduction to Phantom Wallet#

1. Applicable Scenarios
   • Mainly suitable for Solana (SOL) chain, while also compatible with Ethereum (ETH) and Polygon (MATIC) assets.
   • Used for storing tokens, NFTs, staking SOL, and connecting to Solana ecosystem DApps (such as Magic Eden and Raydium).
2. Core Advantages
   • Simple interface design, supports seamless switching between multiple chains.
   • Built-in token swap, NFT display, and staking features.
   • Provides dual support for browser plugins and mobile apps (available for iOS and Android).

2. Installation and Setup#

Step 1: Download Phantom

• Browser Plugin (recommended Chrome or Brave):
  1. Visit the official website phantom.app, click “Download” → select the corresponding browser for installation.
  2. Important Note: Be sure to download from the official website to avoid using counterfeit extensions.
• Mobile:
  Search for “Phantom: Crypto Wallet” in the App Store or Google Play to download.

Step 2: Create a New Wallet

1. Launch the Phantom app and click “Create New Wallet”.
2. Set the wallet name and password (must be at least 8 characters, including letters and numbers).
3. Backup Mnemonic Phrase:
   • The system generates 12 English words, write them down in order on paper (do not take screenshots or store them online).
   • Complete the word order verification to ensure successful backup.

Step 3 (Optional): Import Existing Wallet

• If you already have a Solana wallet, you can import it using the private key or mnemonic phrase:
  Click “Import Existing Wallet” → enter the mnemonic phrase or private key.

3. Basic Operation Guide#

1. Receive Assets

1. Click the “Receive” button on the wallet homepage.
2. Copy your Solana address (format like SOLabc...xyz) or Ethereum address (switch to ETH chain to start with 0x).
3. Provide that address to the sender (e.g., exchange withdrawal address).

2. Send Assets

1. Click “Send” → enter the recipient's address and transfer amount.
2. Select Network:
   • Ensure the network is Solana when sending SOL.
   • Switch to Ethereum network when sending ETH.
3. Confirm the transaction fee (Solana network fees are usually less than $0.01).
4. After verifying the address is correct, click “Confirm” to complete the transaction.

3. Add Tokens/NFTs

• Tokens:
  Click “Tokens” → “+” → search for the token name (e.g., USDC) → click “Add”.
• NFTs:
  NFTs are automatically displayed in the “Collectibles” tab, no manual addition is required.

4. Advanced Features#

1. Multi-Chain Switching

1. Click the network icon at the top (default shows Solana).
2. Select Ethereum or Polygon to manage related assets.
   • After switching networks, the address will change accordingly (e.g., ETH address starts with 0x).

2. Token Swap

1. Click “Swap” → select the token pair to swap (e.g., SOL to USDC).
2. Set the slippage tolerance (default is 1%, to prevent transaction failure).
3. Confirm the exchange rate and fees before completing the swap operation.

3. Staking SOL

1. Click “Earn” → “Start Earning”.
2. Choose a validator node (recommended low commission rate and reputable nodes).
3. Enter the staking amount → confirm the transaction, earnings are updated daily.

4. Connect to DApp (using Magic Eden as an example)

1. Visit magiceden.io, click “Connect Wallet”.
2. Select Phantom → click “Connect” in the popup to authorize the connection.
3. When purchasing NFTs, Phantom will automatically pop up a transaction confirmation window.

5. Security Settings#

1. Basic Protection

• Mnemonic Phrase/Private Key:
  • Store offline, never share with others (Phantom will not ask for it).
  • It is recommended to use a metal mnemonic board (like Billfodl) for fire and corrosion resistance.
• Wallet Password:
  Regularly update the password, avoid reusing it on other platforms.

2. Anti-Phishing Strategies

• Domain Verification:
  Ensure the DApp URL you are visiting is accurate (e.g., magiceden.io not mag1ceden.com).
• Transaction Confirmation:
  Carefully check the address and amount in the popup before signing the transaction to prevent malicious contracts from stealing assets.

3. Enable Privacy Mode

• Turn on “Hide Personal Data” in Phantom settings to prevent sensitive information from being leaked through screenshots.

6. Frequently Asked Questions#

1. Why did the transaction fail?
   • If the Solana network is congested, try increasing the priority fee or retry later.
   • Insufficient balance to pay the transaction fee, ensure to reserve at least 0.02 SOL as a buffer.
2. How to recover the wallet?
   • Install Phantom on a new device → click “Import Existing Wallet” → enter the mnemonic phrase.
3. Does it support hardware wallets?
   • Supports Ledger connection, select “Connect Hardware Wallet” in settings for enhanced security.

Blockchain - Virtual Currency#

Categories#

USDT vs USDC#

1. Core Differences

2. Use Cases

• Transfers: Choose the corresponding chain when withdrawing from exchanges (e.g., ERC20 requires ETH for gas fees).
• Trading: Exchange for BTC or ETH on exchanges to avoid price volatility risks.
• Hedging: Convert to USDT or USDC to preserve value during market downturns.

⚠️ Note: Cross-chain transfers must confirm that the other party supports the same chain, otherwise, it may lead to asset loss!

Beginner's Must-Read Advice#

1. Small Amount Testing: For first-time operations, test with $10 to familiarize yourself with the process.
   1. Download Phantom and create a wallet (practice the backup process).
   2. Purchase $10 USDT on an exchange (choose Solana chain, be mindful of other products like ERC20, TRC20, BEP20, etc.).
   3. Try using USDT to exchange for a small amount of Solana or other cryptocurrencies on the exchange to experience the operation.
2. Learn Gas Fees: Gas fees can be higher during Solana network congestion, so it is advisable to choose the timing for operations.
3. Beware of Scams: Do not trust “private message airdrops” or “official customer service private messages”.
4. Backup Double Insurance: Store the mnemonic phrase in two places (e.g., home and bank safe).

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