01 · 20% off OKX fees
20% off every trade
OK66688 is linked to your account at sign-up. Spot and futures trades are charged at the discounted rate, with no end date. Beginners trade often, so it adds up.
See how much you’d save
Updated 2026-09-28 · OKX code OK66688
Crypto, explained
Crypto, explained
from zero.
What bitcoin is, how blockchain works, whether phone mining and Pi Network are real, how to turn USDT back into cash: the questions beginners search most, answered chapter by chapter. When you’re ready to sign up, enter OK66688 and pay 20% less on every trade.
OKX referral code OK66688Bitcoin · Blockchain · Crypto types · Mining · Cash-out · Exchanges
01 · Why enter a referral codeSign up with OK66688:
Sign up with OK66688:
what do you get?
All rewards are paid by OKX itself. We only provide the guides and the code. We never handle your money or ask for your passwords or codes.
02 · OKX new user rewards
New-user rewards still apply
Complete identity verification, your first deposit and first trade, then claim rewards in the app’s Rewards Center. Rewards change often; the Rewards Center shows what’s current.
Four steps to sign up03 · OKX proof of reserves
A large exchange with checkable reserves
OKX publishes proof of reserves every month so you can verify your balance is covered. There’s also a demo mode for free practice and 24/7 live chat.
Why reserves matter02 · Where beginners should startSeven chapters,
Seven chapters,
and you’ve got the basics.
Reading in order is easiest: bitcoin and blockchain first, then coin types and mining, then making money, cashing out and exchange risk.
Ch. 1 · What is bitcoin?
Proposed by Satoshi Nakamoto in 2008, launched in 2009, capped at 21 million. Why it’s valuable, and why people call it a scam.
Read chapter 1Ch. 2 · What is blockchain?
A public ledger everyone keeps and nobody can edit. Plus decentralization, public chains, gas and wallet addresses.
Read chapter 2Ch. 3 · Types of crypto
The digital yuan is legal tender; bitcoin isn’t. Majors, altcoins, stablecoins, tokens and NFTs explained.
Read chapter 3Ch. 4 · What is mining?
Rigs, electricity and hashrate; where mining is banned; and why phone and cloud mining usually disappoint.
Read chapter 4Ch. 5 · Can you make money?
Price moves, fees and liquidations: how money flows, why most beginners lose, and how to play it safe.
Read chapter 5Ch. 6 · Cashing out USDT
How P2P selling works, the real reason accounts get frozen, what to do next, and which offers to avoid.
Read chapter 603 · Crypto basics quizSeven questions:
Seven questions:
how much do you know?
Each question is something beginners search for. Pick an answer to see why, and jump to the matching chapter.
My crypto basics score0/7
Pick an answer to see the explanation. Your answers are saved only in your own browser.
- 01
How many bitcoin will ever exist?
Correct.Not quite.The 21 million cap is written into bitcoin’s code and nobody can change it, which is one reason it’s called “digital gold”. Why bitcoin has value
- 02
Is China’s digital yuan the same thing as bitcoin?
Correct.Not quite.The digital yuan (e-CNY) is issued by the People’s Bank of China and, from 2026, verified wallets even earn interest. Bitcoin has no issuer and its price is set by the market. Digital yuan vs bitcoin
- 03
An app lets you “mine” coins by tapping your phone once a day. Is that real mining?
Correct.Not quite.Real bitcoin mining needs specialized machines and lots of electricity. Phone apps can’t mine bitcoin; most grow by recruiting and their tokens often crash after launch. Is phone mining real?
- 04
USDT is designed to track the price of…
Correct.Not quite.USDT is a US dollar stablecoin, so 1 USDT ≈ 1 USD. It’s the most common currency for buying other coins. How to cash out USDT
- 05
After selling USDT on P2P, a seller’s bank account gets frozen. The most common cause is…
Correct.Not quite.If the buyer paid with scam or illegal gambling proceeds, investigators freeze every account the money touched. Use verified merchants and keep records. Bank account frozen?
- 06
Which is the most useful sign that an exchange is trustworthy?
Correct.Not quite.Proof of reserves lets you check the exchange actually holds your coins. Size, licenses and how it handles incidents matter too. What is proof of reserves?
- 07
What’s the safest way to make your first crypto purchase?
Correct.Not quite.Start with money you can afford to lose, buy spot, and walk through deposit, buy, sell and withdraw. Leave futures and copy-trading for later. Can you make money with crypto?
04 · The traps beginners fall intoThree traps
Three traps
beginners fall into.
Beginners often lose money not because of the market, but because they took the wrong road on day one.
Treating crypto as a way to double your money fast
Borrowing to buy in after seeing someone’s gains, or opening high-leverage futures, can wipe you out in one swing. Buy spot with spare money first. Why most people lose
Believing in “guaranteed” mining or yield
Phone mining, cloud hashrate, guaranteed returns, referral bonuses: one of these is a warning sign, two is almost always a scam. What mining scams look like
Swapping USDT with strangers
A slightly better rate and no ID check look convenient, but the money you receive may be criminal proceeds. That can freeze your bank account or pull you into an investigation. Offers to avoid
05 · Fee calculatorWith OK66688,
With OK66688,
how much could you save?
Every swap is a buy and a sell, so you pay fees twice. Try a small amount if you’re just starting.
| Trade type | No code | With OK66688 |
|---|---|---|
| SpotBTC, ETH and all other coins | 0.080% / 0.100% | 0.064% / 0.080% |
| USDT-margined futuresUSDT collateral | 0.020% / 0.050% | 0.016% / 0.040% |
| Cheapest combolimit order + code | 0.080% | 0.064% |
| How long it lasts | — | For life |
You pay a fee on both the buy and the sell. Estimates use OKX regular Lv1 rates with a 20% discount; check the OKX fee page for current rates.
06 · How to open an OKX accountReady to sign up?
Ready to sign up?
Four steps.
From sign-up to your first purchase takes about fifteen minutes. We suggest reading the chapters first. Take the quiz
Start from a trusted link
Use the button on this site to open OKX sign-up with OK66688 filled in. Don’t click links sent by strangers in DMs or groups.
Sign up with phone or email
Use a password you don’t use anywhere else, at least 12 characters mixing letters, numbers and symbols.
Verify your identity
Upload your ID and complete the face check. You need this to deposit and trade, and to claim new-user rewards.
Make one small spot buy
Buy a little USDT or bitcoin, then sell some and check your balance. Learn the flow before trying anything else.
Ready to open an account? Enter code OK66688 at sign-up for 20% off every trading fee, for life.
07 · Where to buy your first cryptoYour first crypto:
Your first crypto:
where you buy matters.
Buying the same small amount of bitcoin through different channels means different prices, safety and help when things go wrong.
| Private swaps from chats or DMs | Small, unknown exchanges | OKX · code OK66688 | |
|---|---|---|---|
| Is the money’s source clear? | No, easy to receive criminal funds | Depends | Verified P2P merchants with order records |
| Can you check reserves? | No | Usually not published | Monthly proof of reserves |
| Fees | Hidden in the spread | Standard or higher | 20% off for life |
| Who helps when it goes wrong? | Nobody once you’re blocked | May shut down or pause withdrawals | 24/7 live chat in the app |
| Good for beginners? | No | Not recommended | Yes, with a demo mode to practice |
08 · Crypto news, September 2026September 2026:
September 2026:
news beginners should know.
News as of 2026-09-28. Each item links to its source and is for reference only.
Bitget loses about $387M from hot wallets
Unauthorized transfers were spotted on September 24 and withdrawals paused. Bitget says its protection fund covers the loss, and withdrawals resume in phases from September 28.
Yahoo FinanceCoinEx is closing down
After nine years, CoinEx halts spot trading on September 29 and keeps withdrawals open until December 22. It says reserves exceed 100%.
Wu BlockchainBitcoin around $83,000
Bitcoin was about $83,069 on September 28, after dipping below $78,000 early in the month. September has historically been bitcoin’s weakest month.
FortuneChina’s digital yuan now pays interest
Since January 1, 2026, verified e-CNY wallets earn the demand-deposit rate. Anonymous wallets don’t. It’s a completely different thing from bitcoin.
People’s DailyChina orders a halt to new mining
A February 6, 2026 notice from eight regulators requires provinces to shut existing crypto mining projects and bans new ones, along with mining rig sales.
CSRCPi Network down about 90% since launch
Pi opened its mainnet in February 2025 and briefly neared $3. For most of 2026 it has traded around $0.20 or lower.
Sina Finance09 · Where to start learning about cryptoStarting from zero?
Starting from zero?
Read in this order.
Understand bitcoin and blockchain first, then the types of coins and mining, then how money is made, cashed out and kept safe. Each chapter takes about ten minutes.
Chapter 1 · Why bitcoin has value
What is bitcoin?
Who created it, why it has value, how many exist, what one costs today, and whether it’s a scam.
Chapter 2 · Blockchain in plain EnglishWhat is blockchain?
Blockchain, decentralization, public chains, smart contracts, gas fees and wallet addresses, explained with a shared ledger.
Chapter 3 · Digital yuan vs bitcoinTypes of cryptocurrency
Crypto vs digital currency vs China’s digital yuan, plus majors, altcoins, tokens, NFTs and DeFi.
Chapter 4 · Is Pi Network legit?What is crypto mining?
What miners actually do, whether you can mine at home, where it’s banned, and the truth about phone mining and Pi Network.
Chapter 5 · Whose money are you making?Can you make money with crypto?
Where crypto profits come from, why most beginners lose, and how to take part without getting hurt.
Chapter 6 · Bank account frozen after cryptoHow to cash out USDT
Selling USDT for local currency via P2P, why bank accounts get frozen, and what to do if yours is.
Chapter 7 · Exchange paused withdrawalsWhat if a crypto exchange goes bust?
What CoinEx’s shutdown and the Bitget hack mean for ordinary users, and how to judge an exchange.
10 · FAQCrypto basics
Crypto basics
FAQ.
01I know nothing about crypto. Where do I start?
Read the chapters in order: what bitcoin is, how blockchain works, the types of coins and mining, then how profits are made, how to cash out and what exchange risk looks like. Take the quiz afterwards and revisit any chapter you missed.
02What is bitcoin, in one sentence?
Bitcoin is a digital asset launched in 2009 with no issuer, recorded on a ledger kept by computers around the world, with a hard cap of 21 million coins. Its price is set entirely by buyers and sellers and moves a lot.
03Do I have to buy a whole bitcoin?
No. Bitcoin divides to eight decimal places; the smallest unit is a satoshi. You can buy a few dollars’ worth on OKX.
04Is crypto legal?
It depends on where you live. Many countries allow buying and holding crypto under their own rules, while mainland China treats crypto business activity as illegal financial activity. Check your local law first.
05How much should a beginner put in?
Only money you could lose without it affecting your life. Don’t borrow or use a credit card. Learning the buy, sell and withdraw flow with a small amount matters far more than the size of your first trade.
06What is the OKX referral code and what does it do?
Our code is OK66688. Enter it in the “Referral code (optional)” field at sign-up, or use our button to fill it in, and you get 20% off spot and futures fees for life. It can only be added when you create the account.
07Is it risky to use a referral code?
No. It only records who referred you and applies your fee discount. The referrer can’t see your balance, passwords or trades, and can’t touch your account.
08Are the new-user rewards real?
Yes, they’re an official OKX program. Complete tasks like identity verification, first deposit and first trade, then claim them in the Rewards Center. What’s offered changes; the Rewards Center shows current rewards. Using a code doesn’t affect them.
09Can I practice without real money?
Yes. OKX has demo trading with virtual funds, so you can learn the interface before deciding whether to use real money.
10Is this the official OKX website?
No. This is an independent third-party site. We don’t offer login, deposits, exchange or custody, and we never ask for passwords or codes. We may earn a commission if you sign up through our link, at no extra cost to you.
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OKX referral code OK66688
Go to OKX sign-up
Learn first, then start small, and enter OK66688 when you sign up.
Get to know buying and selling with a small amount. Every trade costs 20% less, so practice is cheaper.