If the fraudulent action is successful, the first transaction becomes invalid, and the attacker can spend the same crypto twice and commit fraud.Common Forms of Double-Spending Attacks 51% Attack: If a miner or mining pool controls more than 51% of the network’s computing power, they can theoretically control the order of transaction confirmations, enabling double-spending.

Double check to see that you've indeed signed and sent your transaction.Wrong address or blockchain network When sending your crypto out, make sure that you’ve chosen the proper network and that you double check your receiving address. If you’ve sent your crypto to the wrong receiving address or blockchain network, please reach out and file a support ticket.

Always double-check the UID or withdrawal address before confirming a transfer. Consider using the Address Book feature in your OKX account to save frequently used addresses safely. Enable security reminders and confirmations in your account settings to reduce mistakes.

Martingale is a trading strategy based on the concept of doubling the trading size after every loss. With a doubled position size each time after losses, the size of the next profitable trade will exceed the combined losses of all previous trades with additional profit. In simple terms, if you lose a trade, you double your next trade to recover your losses and hope to make a profit.

Run the tool again by double-clicking offBoarding_Mac_script.command. Open your browser and go to http://localhost:3000. Note: After this initial setup, you only need to repeat Step 4 to run the project again.ii) Windows users Double-click offBoarding_Windows_script.bat in the Wallet-Release-main folder. If Windows Defender SmartScreen shows a warning, select More info > Run anyway. If you see a permissions error, right-click the file and select Run as administrator.

On the App Open your OKX App, then select Trade (double tap) > Buy and sell Double tap Trade to view trading options Go to Buy or Sell, then select the fiat currency and cryptocurrency you wish to transact.

Note: it might be a fake admin account if you can’t find a username or it’s being placed under the Bio section instead. Open user info in Telegram and copy the username Go to our channel verification to verify the page link and username. You can refer to the How do I verify OKX accounts section to learn more about how to verify the page link and username.Phone call Copy the phone number that you have received and go to our channel verification to verify the phone number.

Once the buyer completes payment, you should always double-check if you have received the correct amount. When you have confirmed that you have received the payment made by the buyer, proceed to the respective order and release crypto.On the app Log in to your account on the OKX App and select Buy crypto > P2P trading Open P2P trading from homepage Select Sell at the top and select the local currency you want to receive.

Double-check permissions Before signing any contact, carefully review the permissions you're granting. If something seems off, don't proceed. Stay informed Regularly update yourself with the latest security tips and information from trusted crypto communities and sources. For more info on this topic, visit here.

Tap the banner to complete your tasks Note: always double-check the sender and look for your anti-phishing code to avoid scams. Access these tasks through the official app only.Step 2: Select your pending tasks After selecting the banner, you'll be directed to the Security Task Center page showing the actions you need to complete.

Double-check that all required fields are accurately completed. If you're unable to proceed as you're waiting for your team to prepare certain documents, you can continue working on other parts of the application. Use the progress bar on the side to navigate and fill out any remaining sections. Note: Document should be an original copy (preferably in PDF file format), clear quality, and smaller than 20MB.

Go to Trade > Positions Select the position you want to reverse Select the Reverse button (double-arrow icon for App) Note: this feature is available only in One-Way Mode; Hedge Mode isn't supported.

Double-spending risk control Double-spending risk control restricts withdrawals or sales only for the amount equivalent to the deposit. Other account functions aren't affected.This measure protects your funds. You can check the estimated recovery time on the withdrawal page. The restriction is removed automatically once the period ends.Other account freezing or restriction scenarios Check your inbox and spam folder for emails from our platform.

Double check the buy preview and select Buy crypto to complete your buy order 6. After you complete the payment, you can select Review details to view your order history or select Back to home to your homepage. Where can I view my buying history? Use the same method as above to access your Buy crypto page Find Order history to view your buying orders Select order history on buy crypto pageFrequently Asked Questions 1. Why am I only able to select certain payment methods?

Incorrect backup password: Double-check the password you set for the cloud backup. The backup password must be at least 6 characters long and doesn't have any special format requirements. Please note that this password is different from your wallet password. Insufficient cloud storage: Ensure there's enough available storage in your cloud drive. You may need to clear some space before trying again.