Etherscan is a distributed smart contract platform launched in 2015 for the exploration and analysis of Ethereum blocks. Since the transaction information and other data in the blockchain are open and transparent, and Etherscan serves as a window to explore Ethereum, users can use its View your own transaction details and any information in Ethereum.
In the blockchain world, there is an application similar to "Express Inquiry Tool", it is Etherscan, and the
website is https://etherscan.io/
Transaction information query
Now I want to query all transaction information of a wallet address 0xD5bc17b6701f9...Cab51bFaE24B2D4Acc2F
Step1: Etherscan has its own database records, so if an address has conducted ETH transactions on the blockchain, or has been queried, the input box will automatically fill in the address you want to query.
Step2: Click on query to change the address, and enter the interface below, which contains all the transaction information of the address and the number of assets. For details, see the figure below.
Step3: Click on the TxHash or TxId of a transaction to view the details of the transaction
The above is the display content of the successful transfer of ordinary Etherscan, so what is the transaction information of other contract tokens (Token) except ETH? Here we take the transfer of Atmatrix as an example
The above is the display content of the successful transfer of ordinary Etherscan, so what is the transaction information of other contract tokens (Token) except ETH? The above two pictures show the style of successful transfer, so what is the failure of transfer? Mainly as follows Two common types:
Type 1: Out of Gas (insufficient miner fee) For the idea of miner fee, please refer to my previous article. I will not explain the concept in detail here. If the query transaction on Etherscan has the following display, it means “miner” Insufficient fee".
Type 2: Bad Instruction This problem is a general error type, but such a transaction, although it fails, will still be deducted from the miner's fee. And the transaction amount will be returned the same way, and the transaction will be cancelled.
ERC-20 Token Query
Many imToken users will be told during use that imToken currently only supports ERC-20 tokens. We don’t need to delve into what ERC-20 is here, we only need to know that ERC-20 is the standard of Token, and this standard happens to meet Ethereum's token standard. Users can use Etherscan to query which tokens conform to the ERC-20 standard.
Enter https://etherscan.io/tokens , or enter the name of the token you want to find into the address bar, and the search box will automatically prompt if it conforms to the ERC-20 standard.
Contract code query
Children's shoes who know a little bit of technology can actually try to see some Token contract codes. Different projects may adopt the method of constantly issuing Tokens, which can be found in the contract codes. It will not be elaborated here, and the following is an example of OMG.
special project operations
Using Etherscan, you can view all the public information on Ethereum, such as previous EOS projects. Many Xiaobai don't know which cycle they are investing in or whether they have claimed the Token. In fact, using Etherscan can solve this problem very well. Due to the particularity of the EOS project, we use it here as an example.
Step1: Enter EOSCrowdsale in the search box
Step2: Click Read Smart Contract
Step3: At this time, you can see "1.> claimed" below, you can enter the voting period in "input(uint256)", and enter the voting address in "input(address)", click "Query" , if the bottom shows true, it means that the Token of this cycle has been claimed, if it shows false, it means that you have not claimed the Token of this cycle.
Step4: Select "6. >userBuys", this place is used to query the EOS that participated in the investment in which cycle, and how much has been invested. Similarly, "input(uint256)" input the period of participation, and "input(address)" input the address of participation. (Reference: Use "displayed value/10 to the 18th power", for example, the picture shows: 100000000000000000 / 10^18 = 0.1 , 0.1 is the number of EOS invested at that time)
Note: This is just to show you the powerful functions of Etherscan, Since September 4, 2017, the seven ministries and commissions' "Announcement on Preventing the Risk of Token Issuance and Financing" has clearly defined ICO as illegal public financing, and readers are also requested to abide by national laws and regulations.
ENS Domain Name Lookup
Many people who are new to blockchain may not know much about ENS domain names. ENS is the Ethereum Domain Name Service, a distributed, open and extensible domain name system based on Ethereum. While some hash addresses used in the Ethereum ecosystem are often quite long, such as Ethereum wallet addresses and hash addresses for Swarm files, the ENS domain name system is designed to provide users with short, easy-to-read domain names. Currently imToken supports ENS domain name registration and transfer transactions.
The functions of Etherscan are extremely powerful, so I will not explain them one by one here, and there are many functions that the author has not studied clearly, for fear of "mistaken". If you are interested in Etherscan, you can study it in depth. With such an artifact, there will be no more panics in the future due to issues such as failure to account for transactions and transfers.