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In August 2021, a crypto trader made a small mistake with significant consequences. He sent about $100,000 worth of Ether, but accidentally typed the wrong number instead of paying the usual few dollars in transaction fees. His “fat finger” slip cost him $90,000 in fees on a single transfer.
The transaction was spotted on the Ethereum blockchain on August 10, 2021, showing a transfer of 0.05 ETH with a 23 ETH fee (around $90,000 at the time). The sender’s wallet address was visible, but, like most blockchain addresses, it didn’t have any personally identifiable information attached.
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The miner who received the fee belonged to SparkPool, one of the largest Ethereum mining pools back then. SparkPool confirmed that they had contacted the user and later returned 50% of the fee after verifying the mistake.
Stories like this spread quickly in crypto because they’re funny in a tragic way, but they also underline something important: crypto rarely ever forgives mistakes.
But with the proper knowledge, these mistakes are entirely avoidable.
Getting into Crypto
Think back to the early days of the internet. If you wanted to “get online” in 1999, you needed dial-up, a noisy modem, maybe AOL software in a shrink-wrapped box. It felt alien. Today, connecting is invisible, and we barely think about it.
Crypto has its own entry points.
The first is Crypto Exchanges. They work like online marketplaces. You sign up, get an account, and buy cryptocurrencies directly with fiat money (dollars, pounds, euros, etc). The benefits are that it’s often fast and suitable for people who don’t value privacy. The drawback here is that you’re trusting the exchange with your personal data and your coins until you move them into your wallet.
Peer-to-Peer (P2P) trading skips the middleman. You buy directly from another person—maybe through an online platform, maybe in person. It can be cheaper or more private, but the risks are higher: you need to trust the other party, and scams are more common.
Either way, once you’ve crossed the on-ramp, you’re in. You hold crypto in your wallet. Now what?
Getting Out Again: The Off-Ramp
At some point, you might want to turn crypto back into dollars, euros, pesos, whatever your local currency is. That’s the off-ramp.
The simplest way is through the same exchanges integrated you used to buy. You sell your coins, and they deposit the funds into your bank. It's easy, but remember, fees vary, and your bank might take a cut, too.
Liquidity also matters here. If you’re selling Bitcoin or Ether, no problem, because the market is huge. It may not be so simple if you’re selling some small, obscure token. Think of it as trying to sell rare baseball cards versus dollar bills: one is always in demand, and the other depends on finding a buyer.
The key is to always start small. Test the system before moving large sums.
Sending and receiving crypto
Sending crypto feels like sending a package with a permanent address label; you can’t change its destination once it's sent.
Every crypto wallet has an address: a long string of letters and numbers. It’s the digital equivalent of an account number. If you get one digit wrong, the crypto doesn’t bounce back; it disappears forever.
And here’s the trickier part: cryptocurrencies often exist on multiple networks. For example, USDT (Tether) exists on Ethereum, on Tron, Solana, Base, and many more. Each network has its own address for the same token. That’s why you must double-check addresses, and sometimes even send a “test transaction” with a tiny amount before moving the full balance.
What Is Gas?
You’ve probably heard the term “gas fees.”. Gas is simply the payment you make to the network to process your transaction.
Think of it like toll roads. If you want to drive your transaction across the blockchain, you pay a toll to the validators who maintain the roads. On a quiet day, the toll might be pennies. It can cost much more on a rush-hour day, like when the market is very active.
Managing Transaction Fees
The good news is that you can check the gas fee before you hit send. Many wallets show you the current gas fees, and often give you a choice:
- Pay a little more to have your transaction confirmed quickly.
- Pay less if you don’t mind waiting.
Think of it like mailing a package: express delivery versus standard shipping. Both get there, just at different speeds and costs.
Your First Safe Transaction
Here’s how it might look in practice:
- Open the Tangem App.
- Add USDT or any stablecoin to your portfolio by finding and enabling them in Markets.
- Select USDT or any stablecoin and tap Buy from the list of available assets.
Choose your payment provider (e.g., Mercuryo, Simplex, or Unlimit).Enter the purchase amount and follow the on-screen steps to complete payment with your bank card, Apple Pay, Google Pay or preferred method. - Once the transaction is processed, USDT will appear directly in your Tangem Wallet.
From there, you can swap tokens inside your wallet or even stake a coin to earn interest. But the important part is this: you’ve gone from buying crypto to safely moving it around, all without fear.
Using crypto is about being careful. Double-check addresses. Start with small amounts. Know the fees before you press send. Do that, and you’ll never end up paying $90,000 for a $10 transfer.
Quick Quiz
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