how to cancel unconfirmed electrum transaction?

2022-04-08

Hackers launched a denial-of-service (DoS) attack on a well-known wallet Electrum server, according to Johnwick.io. Hackers used botnets of more than 140,000 computers to attack Electrum nodes and simultaneously deployed malicious nodes. When a user connects to these malicious nodes and sends a transaction using an older version of Electrum, the user is prompted to update the Backdoor Client. If the user installs the client as prompted, the private key is stolen and all digital assets are lost. Millions of dollars of digital currency have been stolen, according to Electrum officials. De-dimensional Security Labs recommends that users of electrum wallets be updated to the latest version of the client through the official website and never use the link in the prompt message.

Johnwick.io found that hackers launched a denial-of-service (DoS) attack on a well-known wallet, Electrum server. Hackers used a botnet of more than 140,000 computers to attack Electrum's nodes and simultaneously deployed malicious nodes. When a user connects to these malicious nodes and sends a transaction using an older version of Electrum, the user is prompted to update the Backdoor Client. If the user installs the client as prompted, the private key is stolen and all digital assets are lost. Millions of dollars of digital currency have been stolen, according to Electrum officials. Devi Security Labs recommends that users of Electrum Wallet update to the latest version of the client via the official website and never use the link in the prompt message.

An unconfirmed UTXO is the output of a transaction that is still in the memory pool (i.e. not yet confirmed). To prevent DoS attacks on node memory pools, nodes set additional restrictions on transactions that use unconfirmed UTXOs. This means that you cannot guarantee that unconfirmed UTXO will be used at any time. For example, until the first transaction (tx0) is confirmed, the wallet may not be able to propagation of the second transaction shown below (tx1)

At present, there are 5521 unconfirmed transactions on the Bitcoin network, with a median transaction fee of 0.00015313 BTC, and 18492 unconfirmed transactions with a median transaction fee of 0.0001874 and ETH.

Bitcoin's average unconfirmed transaction rose 10.01 percent this week. As of March 1, 2020, the average number of unconfirmed transactions in Bitcoin for 7 days was 6022, up 10.01% month-on-month

At present, there are 7401 unconfirmed transactions in Bitcoin, with a median transaction fee of 0.0002889 BTC, and 18004 unconfirmed transactions with a median transaction fee of 0.000386 ETH. (Tokenview)

Nounce changes the number of the transaction you want to cancel, as shown below, if you want to cancel trade 220, fill in 220 inside the nounce.

How to develop and communicate IT spending cuts and how to cancel, reduce, or suspend budgets.

Bitcoin's average unconfirmed transaction this week rose 219.86 percent. As of May 3, 2020, the average number of unconfirmed transactions in Bitcoin over 7 days was 1168, up 219.86 percent month-on-month

ShapeShift was forced to cancel transaction fees because most users chose a centralized exchange.

Ethereum unconfirmed transaction trend chart

Ethereum unconfirmed transaction trend chart

Bitcoin's average unconfirmed transactions rose 528.71 percent this week, while Ethereum's unconfirmed transactions rose 138.44 percent. As of May 19, the average number of unconfirmed transactions in Bitcoin over seven days was 32,127, up 528.71% month-on-month. Ethereum's 7-day unconfirmed transaction averaged 26,215, up 138.44% month-on-month, with a minimum of 12,783 and a high of 38,258.

Otto also suggested in the video that "Bitcoin Cash fix this problem," referring to unconfirmed transaction duplicates. While Cointelegraph cannot be sure that BCH's unconfirmed deals are also outstanding, Young suggests.

Bitcoin's average unconfirmed transaction this week rose 146.32 percent. As of March 15, 2020, the average number of unconfirmed transactions in Bitcoin over 7 days was 14442, up 146.32% month-on-month

The above three graphs show the number of unconfirmed transactions across the network within 48 hours, the unconfirmed transaction fees, and the memory pool's unconfirmed transaction volume. From the graph we can clearly see that the trend of each chart is about the same, the time is consistent with the market fluctuations. So when the market comes, a large number of currency transfers will cause the above three data surge.

According to blockchain.info, the number of unconfirmed transactions in Bitcoin now exceeds 170,000, with the latest figure not 173,000, and continues to grow. Unconfirmed deals are concentrated in North America and Europe, according to the data. Bitcoin transaction confirmation speed and high transaction costs have been raised many times.

ETH unconfirmed transaction volume 32960

ETH unconfirmed transaction volume 32960

This "update tip" is not an official act of Electrum, but a phishing attack by an attacker that exploits a message flaw on the Electrum client and the ElectrumX server, which requires the attacker to deploy the malicious ElectrumX server in advance, and the malicious server is localized by the user's Electrum client (because the Electrum client is a light wallet and the user needs the ElectrumX server to broadcast the transaction). At the time of the madness, malicious ElectrumX servers accounted for as many as 71% of the total, and the show doesn't fully count that hundreds of bitcoins have been stolen in this phishing attack over the past year or so.

An unconfirmed transaction limit is a limit on the number of transfers made for an unconfirmed transaction, wherea 25 means that the unconfirmed transaction can only be transferred 25 times in a row in a 10-minute period, and the number of more transactions will not be packaged into a block.

There were 13,866 unconfirmed transactions on the Bitcoin network today, with a best transaction fee of 0.00002712 BTC, and 10,224 unconfirmed transactions across Ethereum.

How do I cancel a transaction?

How do I cancel a transaction?

Then introduce the domestic website BTC, the website belongs to the mainland, you can also query unconfirmed transactions. Enter through the "Statistics" section and find "Unconfirmed Deals" as you can see. Unconfirmed transaction volumes are almost half of the record highs at the end of 2017, according to the website.

In the end, you've completed your first transaction with the Electrum Wallet.

Bitcoin's average unconfirmed transaction rose 5.35 per cent this week, while Ethereum's average unconfirmed transactions fell 14.78 per cent. As of June 16, the average number of unconfirmed transactions in Bitcoin over seven days was 13,103, up 5.35% month-on-month. Ethereum's 7-day unconfirmed transaction averaged 22,875.19, down 14.78% month-on-month, with a minimum of 18,166 and a peak of 34,133.