A month ago, my friend made a serious mistake while transferring USDT, resulting in a loss of $25,500. This painful experience reminded us to be especially careful in cryptocurrency transactions. Here is the story and the lessons every cryptocurrency user should learn.

**Incorrect Transfer**

My friend intended to transfer $25,500 USDT from his KuCoin account to his business partner's OKX wallet. The other party provided a wallet address that supports the ERC20 network and hoped for a smooth transaction. But the problem arose here:

While setting up the transfer, my friend accidentally selected the Polygon network instead of the correct ERC20 network. He did not notice this mistake and proceeded with the transaction.

After the transfer was confirmed, the USDT was deducted from the KuCoin account but never arrived at the other party's OKX wallet. Despite multiple attempts to recover the funds, it could not be retrieved because OKX's wallet does not support deposits on the Polygon network.

**Lesson: Avoid Major Mistakes in Cryptocurrency**

This incident serves as a reminder that we must be very careful before each cryptocurrency transaction and carefully verify all information.

**Issues Found:**

1. **Network Mismatch**: The sending wallet address supports the ERC20 network, but the transaction chose the Polygon network.

2. **Irreversible Transactions**: Unlike traditional banks, cryptocurrency transfers cannot be reversed once confirmed, and errors cannot be corrected.

**Best Practices to Avoid Similar Mistakes:**

To avoid similar issues in the future, here are some suggestions:

1. **Double-check Wallet Address**: Always recheck the recipient's address and the blockchain network they specified.

2. **Ensure Network Consistency**: Choose a network that matches the blockchain network specified by the recipient.

3. **Test with Small Amounts First**: Before making large transfers, send a small amount of funds to ensure everything goes smoothly.

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