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⑴ Can previous transaction records be checked after the Ethereum 2.0 upgrade?

Yes. Ethereum 2.0, also known as Eth2 or Serenity, is an upgraded version of the existing Ethereum blockchain. The upgrade aims to increase the speed, efficiency and scalability of the Ethereum network, allowing it to handle more transactions. After the Ethereum 2.0 upgrade, previous transaction records can be found, but transactions cannot be performed.

⑵ Where to check the blockchain transaction ID

Here we use the wallet of the Ethereum blockchain as an example. Little Fox is an encrypted wallet and the entrance and exit to the blockchain APP. . After entering, obtain the wallet address, and then use the Ethereum blockchain searcher to enter the homepage of the Etherscan official website. You can obtain the following blockchain transaction ID information:
1. The latest block
2. The latest Transactions that occurred
Extended information:
The transaction process of the blockchain may seem mysterious and cumbersome, but in fact it is not necessarily that difficult to actually talk about it.
Step 1: Owner A uses his private key to sign a digital signature on the previous transaction (bitcoin source) and the next owner B, and appends this signature to the end of the currency to create Transaction order. At this time, B uses the public key as the recipient address.
Step 2: A broadcasts the transaction order to the entire network, and the Bitcoin is sent to B. Each node will receive the transaction information and include it in a block
At this time, for B, the Bitcoins will appear in your Bitcoin wallet immediately, but cannot be used until the block is confirmed. At present, a Bitcoin can only be truly confirmed after being confirmed by 6 blocks from payment to final confirmation.
The third step: Each node obtains the right to create a new block by solving a mathematical problem, and strives to be rewarded with Bitcoins (new Bitcoins will be generated in the process)
At this time, the nodes repeat Try to find a value so that after feeding the three parts of the value, the Hash value of the last block in the blockchain, and the transaction order into the SHA256 algorithm, the hash value are all 0), that is, the solution to the mathematical problem is found.
Step 4: When a node finds a solution, it broadcasts all timestamped transactions recorded in the block to the whole country, and is checked by other nodes in the entire network.
At this time, the timestamp is used to prove that a specific block must indeed exist at a specific time. The Bitcoin network obtains the time from more than 5 nodes, and then takes the middle value to become a timestamp.
Step 5: Other nodes in the entire network check the correctness of the accounting of the block. If there are no errors, they will compete for the next block after the legal block, thus forming a legal accounting blockchain.

⑶ How to query token information of virtual currency

Use Tokenview Ethereum blockchain browser to view, or directly copy the token address you want to query in the search box.
What tokens represent in the blockchainIt is a circulated encrypted digital proof of rights on the blockchain. The three elements of Token: digital proof of rights, encryption and tradability. TOKEN has become an inevitable mechanism for issuance incentives. Blockchain TOKEN is widely recognized thanks to Ethereum and its ERC20 standard.

⑷ Python3 uses Web3.py to query the Ethereum account balance

from web3 import Web3

def QuerryBalanceETH(accounts):

w3 = Web3(Web3.HTTPProvider('https://mainnet. infura .io/v3/ {Set your own hosting account ID here} '))

#accounts = w3.eth.accounts

balance = w3.eth.getBalance(accounts,'latest')#latest means using the status of the last block in the blockchain, which is the final balance

print ('balance@latest => {0}'.format(balance))

return balance

1. What is Infura?

To put it more professionally, Infura is an IaaS (Infrastructure as a Service) product, which aims to lower the threshold for accessing Ethereum data.

In layman’s terms, Infura is a platform that allows your dApp to quickly access Ethereum without the need to run an Ethereum node locally.

From a programmer's perspective, Infura is a Web3 Provider, behind which is a load-balanced API node cluster. The advantage of using it is that you never have to worry about the failure of the connected node, Infura will manage it all.

In addition, Infura can also easily access IPFS. This is another topic and will not be discussed here.

Finally, and very importantly: Infura is currently free.

2. How to use Infura?

To use Infura, you first need to register an account, visit the official website https://infura.io, click to register and provide an email address, you will receive an email, just click the link in the email to activate. Then you will see the following interface:

Click the black button in the upper right corner to create a new project, and you can generate your own Project ID (red box on the left).

Reference article: https://blog.csdn.net/TurkeyCock/article/details/85103434

⑸ How to view bsc blockchain contract details

Open TokenPocketAPP to view.
Click the browser icon below to enter the BSC block browser. The transaction status, sender, receiver, token contract address, transaction fee and other information of the transaction will be displayed on the browser page. Binance Smart Chain (BSC) can be described as a blockchain parallel to Binance Chain. Unlike Binance Chain, BSC has smart contract functionality and is compatible with the Ethereum Virtual Machine (EVM). The design goal here is to maintain the high throughput of the full Binance Chain while introducing smart contracts into its ecosystem.

⑹ If Ethereum coins are withdrawn, can they be traced or recovered?

Yes. Call the police and the police will file a case for investigation and recovery. Transfer records can be used as evidence, and public security organs should generally file a case for investigation. "Ethereum (English Ethereum) is an open source public blockchain platform with smart contract functions. It provides a decentralized Ethereum Virtual Machine (EthereumVirtualMachine) through its dedicated cryptocurrency Ether ("ETH") for processing. Peer-to-peer contracts.

⑺ What is a blockchain browser

Blockchain browser is a website.

Blockchain browser It is different from traditional browsers. Ordinary browsers can query various information and jump to various websites. But the blockchain browser is actually a website. The blockchain browser is specially designed for users to browse and query. Tools for information on the blockchain.

For example, search transaction records, detailed information of a certain block, current chain height, etc. You can also query the balance or transaction details through the wallet address or transaction ID .So the blockchain browser is not an application, nor is it a program built on the public blockchain chain. Simply put, it is a website that can query blockchain data.

In fact, each blockchain system has its own specific browser, and users cannot conduct cross-chain queries through the blockchain browser. Want to checkIf you want to inquire about some information data of a certain blockchain system, you have to go to the browser of the blockchain to query. Take a simple example, the Bitcoin blockchain browser can only query Bitcoin blocks, and the Ethereum blockchain browser can only query Ethereum.

The blockchain browser is like a window into the digital currency. Through the blockchain browser, you can see what is happening inside the digital currency, and each transaction is recorded in detail. The confirmation process of a block and the generation and distribution process of digital currency, and completely record the circulation of digital currency between each block, thereby more completely and openly disclosing the stock, increment and change of hands of digital currency. rates and other information.

⑻ Where to query Ethereum transaction records

It has its own browser, both Ethereum and Ethereum use one, and tokens developed based on Ethereum can also be found in Query it on the Ethereum blockchain browser, and query usdt on the Bitcoin blockchain browser.
On non-small accounts, you can view the Ethereum market, but you cannot trade. If you want to invest, you can go to a digital currency exchange. Currently, the mainstream digital currency exchanges on the market include Binance, Huobi.com, Bitnet, etc. Here we use the Ethereum blockchain wallet as an example. Little Fox is an encrypted wallet and the entrance and exit to the blockchain APP. After entering, obtain the wallet address, and then use the Ethereum blockchain searcher to enter the homepage of the Etherscan official website. You can obtain the following blockchain transaction ID information:
Owner A uses his private key to verify the previous transaction ( Bitcoin source) and the next owner B sign a digital signature, and append this signature to the end of the currency to create a transaction slip. At this time, B uses the public key as the recipient address. A broadcasts the transaction order to the entire network, and the Bitcoin is sent to B. Each node will receive the transaction information and include it in a block. For B, the Bitcoin will be immediately displayed in the Bitcoin wallet, but It cannot be used until the block is confirmed successfully. At present, a Bitcoin can only be truly confirmed after being confirmed by 6 blocks from payment to final confirmation. Each node obtains the right to create a new block by solving a mathematical puzzle and strives to be rewarded with Bitcoins (new Bitcoins will be generated in the process).