How about PCs digital currency

1.

POW: full name of proof of work

pos: proof of stake

both of them are the consensus mechanism of blockchain and the bookkeeping method of digital currency

the difference is:

1. POW mechanism: workload proof mechanism, that is, the proof of workload, is the requirement that must be met when generating a new transaction information (that is, a new block) to be added to the blockchain. In the blockchain network based on workload proof mechanism, the ability of nodes to obtain the correct numerical solution to generate blocks by calculating the numerical solution of random hash hash is the specific performance of node computing power

POS mechanism: the proof of rights and interests requires the certifier to provide a certain amount of ownership of cryptocurrency. The operation mode of the proof of rights and interests mechanism is that when creating a new block, the miners need to create a "currency right" transaction, and the transaction will send some coins to the miners themselves according to the preset proportion. According to the proportion and time of token owned by each node, the equity proof mechanism reces the mining difficulty of nodes proportionally according to the algorithm, so as to speed up the speed of searching for random numbers

extended materials:

the concept of bitcoin was first proposed by Nakamoto in 2009. According to Nakamoto's ideas, the open source software and the P2P network on it were designed and released. Bitcoin is a kind of P2P digital currency. Point to point transmission means a decentralized payment system

unlike most currencies, bitcoin does not rely on specific currency institutions. It is generated by a large number of calculations based on specific algorithms. Bitcoin economy uses the distributed database composed of many nodes in the whole P2P network to confirm and record all transactions, and uses the design of cryptography to ensure the security of all aspects of currency circulation. The decentralized nature and algorithm of P2P can ensure that it is impossible to artificially manipulate the value of bitcoin through mass proction

2. No, the use of digital currency does not need a POS machine at all. It only needs a mobile phone to download the digital wallet, and then it can be used normally, which is very convenient.

3. All are the underlying consensus algorithms of blockchain, power consumption of pow. The dpos used by EOS has 21 super nodes, but it's always bribed to vote, so now dpos is basically labeled as a centralized blockchain. I also think it's against the spirit of blockchain. Por consensus protocol is a new consensus mechanism proposed by Baker chain. It is hatched by Whitfield Diffie's cryptic labs, the father of public key and winner of Turing prize. This lab is the world's best network security lab, and Baker chain is the best network security lab in the world

4.

bus line: y815 Road, about 5.2km

1. Walk about 150m from Huayuan road to Renmin Road Station in Zijingshan mountain

2. Take y815 Road, pass 6 stops to Taoyuan Road Station on University Road

3. Walk about 120m to Zhengzhou book shopping center

5. Normal charge by card, small amount by 1%, 500 is 5 yuan fee, you find him back, can't call complaints.

6. It is suggested that you confirm with the business office
the above contents are for your reference. Please refer to the official website of BOC for the latest business changes
if you have any questions, you are welcome to consult the online customer service of Bank of China or download the mobile banking app of Bank of China.

7. If wechat can't find the details of consumption, it's suggested to check the details of the bound bank card. In mobile banking, you can also go to the business hall to make a running transaction.

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9. The bank calls up the customer's card number, and the bank also has the customer's phone number to ask and call.

10. POS machines are approved by the bank before they can be used

generally speaking, the security of POS is very high, so don't worry too much.