What is Double Flower? What does double spend mean

Honeysuckle, also called double flower, two treasure flower, honeysuckle flower.

It is a commonly used traditional Chinese medicine for clearing heat and detoxifying. According to the query of the quick understanding encyclopedia data, double flower is also known as honeysuckle, honeysuckle is the dried flower bud of plants such as shed honeysuckle, honeysuckle, etc. The color of honeysuckle includes both white and yellow, so it is called "double flower".

It has antibacterial, antiviral, anti-inflammatory, antipyretic, and immune regulation effects, and can be divided into three types: crude medicine, fried medicine, and charcoal medicine.

The common prescriptions for double flowers are as follows:

1. External fever, thirst, or limb soreness: honeysuckle, or 30 grams of honeysuckle vine, decoction in water, and drink instead of tea.

2. Throat congestion and tonsil enlargement: 20 grams of honeysuckle, 3 grams of licorice, decoction in water, 1 dose per day.

3. Prevention of JE and encephalopathy: 10 grams of gold and silver chain flower, forsythia, large green leaves, reed root, and licorice, decoction of water instead of tea, 1 dose per day, for 3 5 days.

If you want to understand blockchain, you must first be familiar with various terms related to blockchain. For example, the "double flower" we talked about today, some people may ask, what kind of flower is double flower? Hahaha, just kidding, let's learn what is a "double flower" in the balance book.

What is Double Flower?

Double payment is also known as "double spending", which means double spending. For example, if I have $100 in my wallet, I can buy an item of equivalent value.

When I went to the store, I found that the lamp and the table were both 100 yuan, so I could only buy one of them. And what we call the double-spend problem, it's the opposite, for the same 100 yuan, I can buy two things.

In the cryptocurrency system, due to the replicability of data, the same digital asset may be reused, which is also called double spending, also known as double spending attacks.

How does the double-spend problem occur?

In a blockchain system, the double-spending problem arises in the following situations:

1. Due to the long time of block confirmation caused by the consensus mechanism, a transaction can be made before the transaction is confirmed before the transaction is completed.

2. Control the computing power blind macro to achieve double spending, after the first transaction is verified and recorded in the block, there is a higher computing power in the network to verify a new longer chain, in which the money is spent for the second time, because the blockchain bar spent for the second time is longer, the chain where the first transaction block is located is invalid, so that the blockchain where the first transaction is located is abandoned by the blockchain network, and the money spent for the first time will return to its own account, which leads to the problem of double spending.

How does Bitcoin avoid double-spending?

In order to solve the problem of double spending, our daily use of digital assets relies on third-party trust institutions. These institutions centralize data management and prevent double-spending by modifying account balances in real time. As a decentralized peer-to-peer value transmission system, Bitcoin solves the problem of double-spending through the integration of UTXO, timestamps and other technologies.

1. First of all, each transaction must first confirm the previous situation of the corresponding bitcoin, and check whether it exists in the user's utxo. If not, then the transaction will be rejected by the system.

2. If the user pays two people with the same UTXO, the node in the system only confirms the payment received first.

3. When two transactions that are close to each other in time are confirmed by different nodes, the blockchain will be forked. The remaining nodes choose to build a new block on what they consider to be the longest chain.

4. When one of the transactions is confirmed by 6 nodes, it will become the longest chain of the system, and the transaction can be considered to have been finally confirmed.

Answer]: A gold pure defeat honeysuckle aliases: honeysuckle, honeysuckle flower, golden flower to do trembling, honeysuckle side branches, two flowers, dense two flowers, double flowers, double bracts, two treasure flowers, golden vine flowers, Su flowers. Therefore, a should be selected for this question.

Double-spending, to put it simply, is spent twice. That is, you take the coins and buy a bottle of water in store A and a bag of melon seeds in store B. Both stores spend almost at the same time, assuming that the stores do not wait for 1 confirmation.

Then maybe one of the A or B stores didn't receive the coins in the end. Then achieve a double spend. There are two cases:

1. Double spend before 1 confirmation Because of the principle, the transaction of 0 confirmation may not be written to the blockchain in the end. Unless it's a small amount, it's best to wait at least for confirmation to avoid such double-spending. In addition, you can also use an off-chain wallet, which can be used in seconds.

2. After confirmation, the double-spend This needs to control more than 50% of the computing power before it can be implemented. That is, it is similar to a small fork, where transactions given to a store are placed in an isolated block. This kind of double spending after confirmation is difficult to implement, and there does not seem to be any case of such double spending, but it is theoretically feasible.

6 confirmations for large transactions, the more confirmations, the more difficult it is to double-spend. This is an instant transaction for a brick-and-mortar store. Like **, and the withdrawal of the trading platform, it often takes a certain amount of time to ship and withdraw the review time.

These times may have to be confirmed by 6 years, they can show you the success first, but if they find that you have double-spent, stop the delivery and do not pass the withdrawal review. That is, it is more difficult to double-spend for the trading platform and **.

"Double spending", that is, a sum of money is spent two or more times, is also called "double spending". In layman's terms, a "double spend attack" is also known as a "double spend attack", that is, the same amount of money is spent twice in some way to obtain services that exceed the funds.

Shuanghua is a Chinese herbal medicine.

Cold and sweet.

It has the functions of clearing heat and detoxifying, evacuating wind and heat, cooling blood and stopping dysentery. It has a certain effect on sore throat, periodontitis, tonsil inflammation, fire, heat rash, sores on the body, eczema in children, itching, hyperlipidemia, and low immunity. Pregnant women can also take it in moderation, not too much, so as not to affect the fetus or cause miscarriage.

It is not recommended for people with weak spleen and stomach to prevent damage to the stomach.