How to verify bitcoin transaction

1.

Transaction mode of bitcoin

bitcoin is e-cash similar to e-mail, and both parties need "bitcoin wallet" similar to e-mail and "bitcoin address" similar to e-mail address. Just like sending and receiving e-mail, the remitter pays bitcoin directly to the other party through a computer or smart phone according to the recipient's address. The following table lists some websites that download bitcoin wallets and addresses for free

a bitcoin address is a string of about 33 characters long, consisting of letters and numbers, always starting with 1 or 3, such as & quot& quot; Bitcoin software can generate address automatically, and it doesn't need to exchange information online, so it can be offline. More than 2 bitcoin addresses are available. Figuratively speaking, there are about two grains of sand in the world. If there is an earth in each grain of sand, then the total number of bitcoin addresses far exceeds the number of all the sand on all these "earths"

the bitcoin address and private key appear in pairs, and their relationship is just like the bank card number and password. A bitcoin address is like a bank card number, which records how much bitcoin you have on it. You can generate bitcoin address at will to store bitcoin. When each bitcoin address is generated, a corresponding private key of the address will be generated. This private key proves that you have ownership of the bitcoin at that address. We can simply understand the bitcoin address as the bank card number, and the private key of the address as the password of the corresponding bank card number. Only when you know the bank password can you use the money on the bank card number. Therefore, please keep your address and private key when using bitcoin wallet

after the transaction data of bitcoin is packaged into a "data block" or "block", the transaction is initially confirmed. When a block is linked to a previous block, the transaction is further confirmed. After six block confirmations in a row, the transaction was irreversibly confirmed. Bitcoin P2P stores all transaction history in a "blockchain.". The blockchain continues to extend, and once new blocks are added to the blockchain, they will not be removed. Blockchain is actually a distributed database composed of a group of scattered client nodes and all participants, which is a record of all bitcoin transaction history. Nakamoto predicts that when the amount of data increases, users hope that not all the data will be stored in their own nodes. In order to achieve this goal, he uses the hash function mechanism. In this way, the client will be able to automatically eliminate those parts that it will never use, such as some very early bitcoin transactions

2. No, the transaction that belongs to you, that is, your utxo will be saved to your bitcoin wallet file, and each payment will be found from your wallet database. If you lose the contents of your wallet, you can use your key information to access the service node to retrieve your utxo. If you lose the key, don't worry.

3. The ID of bitcoin transaction you said should be the address of bitcoin wallet. If the address of bitcoin wallet is wrong, you can't send out bitcoin, it will prompt you to go wrong. Another is that bitcoin transactions will be broadcast all over the network. The records of bitcoin transactions can be queried by anyone and cannot be modified

a bitcoin address is like a physical address or an e-mail address. This is the only information you need to provide when someone pays you bitcoin. An important difference, however, is that each address should only be used for a single transaction

block chain is a public record of bitcoin transactions in chronological order. The block chain is shared by all bitcoin users. It is used to verify the permanence of bitcoin transactions and prevent double consumption.

4. We know the process of information computing hash packing: transaction record, time, account number, last hash value. We also know that all calculation and storage need to consume computer resources. In Nakamoto's design, the completion of bookkeeping can be rewarded with bitcoin by the system, which is also the process of issuing bitcoin. Therefore, bookkeeping becomes mining
bookkeeping
because bookkeeping is a reward, each time you can add a certain number of bitcoin for yourself, so everyone is competing for bookkeeping, which of course leads to a problem: when there is inconsistency in bookkeeping, the system introces workload proof to solve the problem, and the rules are as follows:
1. In a period of time, only one person can succeed in bookkeeping
2. Obtain the unique bookkeeping right by solving the cryptography problem
3. Other nodes the bookkeeping results
but before the workload proof, The accounting node will do the following preparatory work:
1. Collect the original transaction information that has not been recorded in the broadcast
2. Check whether the payment address in each transaction information has enough balance
3. Verify whether the transaction has the correct signature
4. Package and record the verified transaction information
5. Add a reward transaction: add 12.5 to your address Bitcoin
if you succeed in competing for bookkeeping rights, you can get a reward of 12.5 bitcoin
workload proof
the hash value of the previous block and the current account page information will be hashed together as the original information in each bookkeeping. In order to ensure that only one person can keep accounts around 10 minutes, we have to improve the difficulty of keeping accounts. The results of hash must start with several zeros. In order to satisfy the condition, hash is to introce a random number variable
denoted by pseudo code:
1. Hash (last hash value, transaction record set) = 456635bcd
2. Hash (last hash value, transaction record set, random number) = 0000afd635bcd
if you change part of the original information of hash, the hash value will also change continuously. Therefore, when you run hash, the value of random number will change continuously, A random number can always be found so that the result of hash starts with several zeros. The node that finds the random number first obtains the unique bookkeeping right
verification
after the node successfully finds the hash value, it will broadcast and package the block to the whole network immediately, and the node of the network will verify it after receiving the broadcast. If the verification is passed, it indicates that a node has successfully decrypted, it will not compete for the current block, but will choose to accept the block and record it in its own account book for the next round of competitive guessing. Only the fastest decrypted block in the network will be added to the ledger, and other nodes will to ensure the uniqueness of the whole ledger
If a node has cheating behavior, it will cause the node of the network to fail the verification, give up its packaged block directly, and cannot be recorded in the general ledger, then the consumption cost of the cheating node will be in vain. Therefore, miners consciously abide by the consensus protocol of bitcoin system, and ensure the security of the whole system
it's like you go to the construction site to move bricks. After moving bricks for one day, the contractor asks you how can you prove that you move bricks for one day?

5. Bitbao is not a big platform, but it has all kinds of qualifications.

6. Blockchain is a technology and bitcoin is a proct
the proct has been finalized, you can only choose to accept or not, but the technology can be applied to all walks of life

7. As long as three conditions are met, only bitoffer is available

8. Bitcoin system uses asymmetric encryption to improve transaction security. This is what people from Yingfu College of Finance and economics told me. There was a friend there at that time

in the process of information encryption and decryption, different keys are used. Only the corresponding public key can be used for decryption. Owning the private key is equal to owning the ownership of bitcoin

similarly, bitcoin users also need to pass authentication to ensure the ownership of their own cryptocurrency assets.

9. You only need to trade on the formal trading website, so you can ensure that it is true, and you don't have to be afraid of being cheated.

10. Sumeda. Sumeda. Sumeda. How about Nanjing Sumida?

advantages: it's a state-owned enterprise, but it's not bad in the instry.

disadvantages: the salary is not high, so you can't avoid intrigue.

let's have a look for yourself.

What does Sumida group do

Sumida group is an enterprise directly under China machinery and equipment group. It is a well-known foreign trade company specializing in foreign trade import and export business, with an annual import and export volume of over US $1 billion. Jiangsu Sumida International Technology Trade Co., Ltd. is the core enterprise of the group and the main import business company of the group. In 2004, the import and export business scale exceeded US $500 million. It is engaged in the import business agency of chemical procts, metal mineral procts, mechanical and electrical equipment, imported automobiles, etc. it has a huge bank credit of more than 4 billion yuan. Now Sumida Dalian company is looking for employment. Sumeda. Sumeda

How about Jiangsu Sumida company

the company is very good, but a good company does not necessarily have good development

Sumida is a famous company in Nanjing's foreign trade instry, and few in the instry don't know about it

but these large units are not easy to enter. If you are a new college student, even if you enter, it is said that most of them start from the bottom employees in their early 1000's and follow others

as for whether you can get ahead in the future, it depends on your own ability. Sumeda

What's the treatment of sumeda

the training period can be called internship period. The salary of internship period in 2013 is 1500, two months, and the official salary is not high about 2000. But the year-end bonus of all kinds of benefits is good, accounting for 60% of the salary. Other five insurances and one fund and all kinds of holiday benefits are OK

is Sumida group a central enterprise

Sumida group is a subordinate enterprise of state-owned central enterprise, It belongs to central enterprises. Sumeda

Jiangsu SUMEC Group Co., Ltd. (SUMEC) is an important member of Sinomach, one of the world's top 500 enterprises. Founded in 1978, it is a modern manufacturing service group integrating trade, instry, technology and finance, with 76 member enterprises (18 overseas). In 2015, the main business income was 41.8 billion yuan; Ranked 22nd among China's top 100 export enterprises and 54th among China's top 100 import enterprises; 2014 CCTV China brand value evaluation Sumida brand reached 3.379 billion yuan.