Total bitcoin block size

1. The total amount is 21 million, about one block is proced every 10 minutes, and the number of bitcoins in each block is 12.5 after being halved twice, that is to say, 12.5 bitcoins are proced every 10 minutes

2. A block size of bitcoin is 1MB. There is no limit on the size of each transaction. A block can generally contain 2000-3000 transactions.

3. One of the controversial attributes of bitcoin is its fixed supply. At present, 25 new bitcoins are proced every 10 minutes, and the number is halved every four years. Overall, there won't be more than 21 million bitcoins & gt;. On the other hand, each bitcoin can be divided into 100 million shares (each is called 1 "cong"), if one cent is enough to buy a car, it will be troublesome to trade in US dollars, but even if bitcoin rises to the level of US dollars assumed above & gt; We will not encounter such problems. Therefore, in short, the total number of monetary units that will always exist is 2100 billion, that is 2100 trillion, or 250.899. In the square of choosing this value & gt; In fact, Nakamoto is much luckier or smarter than most people realize. First of all, this number is far less than 264-1, which is the largest integer that can be stored in the form of standard integer in a computer. If it exceeds that value, & gt; The value will return to zero like a odometer
secondly, however, there is a smaller threshold for the total number of "smart": the largest possible integer that can be represented in floating-point format. Integers are not the only numbers that computers can store; To deal with decimals, computers & gt; Use a format for floating point representation. Floating point notation is essentially a binary version of scientific notation. For example, here is a value you will encounter when you study physics:
mass of the earth: 5.972 1024 kg
mass of the sun: 1.989 1030 kg
speed of light: 2.998 108 M / s
light year: 9.460 1015 m
mass of proton: 1.672 10-27 kg
Planck length: 1.616 10-35 m
we can notice that, How does scientific notation allow you to represent all of these values with reasonable accuracy, even though they vary greatly in size. Floating point notation is essentially a binary scientific notation; When you store numbers & gt; When the word is 9.625, what your computer stores is "1.001101
* 1011" (in other words, it stores 0100000000100011
& gt; This is the same thing with high-precision sequence form). In this high-precision form, the coefficient (that is, the part that is not the exponent) has 52 bits. This means high precision (more refined & gt; Double precision floating point number is enough to store up to 253 numbers, but it can't be any higher. If it exceeds 253, you have to start cutting off the numbers at the end. Bitcoin's 250.9, the total number of "smart" in the form of index, is just & gt; OK, below this maximum
if we have integers, why should we care about floating-point values? Because more high-level programming languages (such as JavaScript) do not open low-level "floating point" and "integer representation", but only provide "number" representation for programmers; Concepts
– of course, in floating-point form. If Nakamoto chose 210 million instead of 21 million at that time, bitcoin programming in many languages would be much more troublesome than it is now
note that Stefan Thomas unfortunately didn't notice this in time when he wrote bitcoinjs, so that the library used a special "big number big
number" object instead of an ordinary number to store the tutorial output value; My own bifurcated bitcoin JS (along with other improvements) uses ordinary numbers.

4. Triporg travel: a travel service application using blockchain, which provides booking services such as air tickets and train tickets.

5. The credit problem of central system

6.

1. During the first phase of the interstellar war, players only need to place the hang up location in the first and second levels of each map, and they will get a crystal ore as well as props. Because the first and second levels can get props once an hour, So players can get 24 crystal ores in one day, and 24 * 7168 crystal ores in seven days

2. During the activity period, players only need to open any treasure box in the mining area to a certain extent to get the crystal ore reward, which is divided into five grades

3. Electronic competition Wallet: ring the activity period, you can get rewards when you recharge to a certain amount, among which you can get crystal ore bag when you recharge more than 30 yuan, and you can get 100 crystal ore when you open the crystal ore bag

accumulatively support 50 crystal ores to obtain: honor fragment * 1000, detonator * 5, troll statue * 5, mysterious stone * 1

7. I went to have a look. Yes, it is. It refers to the quantity that each block can obtain at present. For example, BTC's is 25, which means that at present bitcoin has a reward of 25 coins per block. Biter's expression is not accurate. You can go to Babbitt's currency circle and suggest that biter make corrections.

8. Yes, when it was released, it showed that its constant number was 21 million. With the passage of time and the efforts of the miners, the number left on the market is less than 2.5 million.

9. Although we have put forward various plans for capacity expansion, they can be basically divided into two categories: long-term rule group and short-term shelving group. The long-term model is idealistic and regular. Once it is finalized, there will be no more twists and turns. If bip101 / 103, a typical representative, sets a growth rule, there will be no adjustment. The short-term faction thinks that the future is unpredictable, fixed rules are too simple, and violent solutions are needed. They hope to set up a short-term plan for several years, which will be avoided for the time being and shelved until the future solution. The representative is bip100. However, e to the complicated voting process, it is simplified to bip102 / 109, etc., while bip248 is postponed to 2020. In recent years, it has simply doubled its growth
since June 2015, after more than half a year of repeated discussion, the long-term rule school has basically failed. In December 2015, after Pieter wuille proposed segregated witness at the bitcoin Hong Kong expansion conference, the expansion problem has even been simplified to upgrade to 2MB, but it has fallen into the debate about the implementation time
a seemingly simple technical problem of capacity expansion has caused the bitcoin community to spend more than half a year holding several global technical conferences and fighting countless private spats, but there is still no clear conclusion. The deep reason behind this is that the increase of block limit value can not really solve the problem of bitcoin expansion
however, some projects do build their own blockchains, such as Ethereum and decent.