When a transaction is "stuck pending" due to a gas fee that is too low for current network congestion ("Why are gas fees so high right now on Ethereum?"), you must replace it with a new transaction that has a higher fee, using the exact same transaction number, or Nonce.

Step-by-Step Guide
Enable Advanced Controls: In MetaMask (Settings > Advanced), ensure Customize transaction nonce is enabled.

Find the Stuck Nonce: Go to your MetaMask Activity tab. Note the Nonce number (e.g., 42) of the OLDEST pending transaction. This is the transaction blocking your queue.

Initiate Replacement: Send a new transaction:

Recipient: Your own MetaMask public address.

Amount: 0 ETH (or 0 of the network's native coin).

Custom Nonce: Manually enter the exact Nonce you noted in Step 2 (e.g., 42).

Boost the Gas Fee: Edit the gas fee to be significantly higher than the original stuck transaction (e.g., 30% higher). Check a gas tracker (like Etherscan or Bitget's) for the current "Fast" Gwei price.

Confirm: Confirm the new 0-value transaction. The blockchain will process the new, higher-fee transaction, replacing and canceling the original stuck one, thus unblocking your wallet.

5B. Resolving Exchange Withdrawal Suspensions (Kraken & Binance)
Many withdrawal issues stem from mandatory security protocols or regulatory compliance checks, which cannot be bypassed by support.

I. Binance Europe: 'Withdrawal Suspended due to Risk Control'
This typically means your fiat withdrawal (SEPA) has been flagged for an Anti-Money Laundering (AML) or Source of Funds (SoF) review, often triggered by large or first-time cash-outs.

Action: Immediately check your email or Binance Notification Center for the official request.

Required Documents: You must provide the requested documentation to prove the legal origin of your funds (e.g., recent bank statements, pay slips, tax returns). Delays are administrative and based on the review queue.

Avoid: Do not attempt multiple simultaneous withdrawals, as this can worsen the "System Busy" error and delay the compliance review.

II. Kraken: '72 Hour Withdrawal Hold'
This is a non-negotiable security feature designed to prevent hackers from draining funds immediately after gaining access or after a specific funding method.

Triggers: Adding a new withdrawal address, resetting your password, or making an instant digital wallet/card purchase.

Bypass Status: You cannot bypass the 72-hour hold. Kraken Support is mandated not to override this time-based security lock.

Solution: Wait for the timer to expire. If the hold persists past 72 hours, check your account history for the exact hold expiration time (often listed in UTC) or contact the support line.

For critical security reviews or clarification on documentation for compliance holds, use the dedicated support line: 1-888-825-6148