1. Ethereum is an open source public
blockchain platform with smart contract function. As of February 2018, Ethernet is the second highest cryptocurrency in market value, second only to
bitcoin. There are many ways to quickly create Ethereum wallet in daily coin collection. According to the operation, it can be completed quickly. After the creation, you can get free virtual coin directly from the website.
2. You can choose to trade in the
digital currency exchange. At present, the mainstream digital currency exchanges in the market are coin security, fire currency and bitnet.
3. Ethereum wallet address is your bank card number. If you forget the address, you can use the private key, mnemonic words and keystore + password to import the wallet and retrieve it. Buying and selling Ethereum is even easier. You can open an account with $100 in the realm Kingdom, and then analyze the price. Buying up or down means buying in the right direction is profitable.
4. In Ethereum, all kinds of transfer and other transaction operations need to be completed by accounts. In the transaction platform, such as currency exchange transaction platform, each transaction needs to have a transaction initiation account and a transaction receiving account. Each account corresponds to an address, and the account name is the label of the address. Use a wallet to manage accounts. A wallet can contain multiple accounts. Of course, you can also create multiple wallets
5. You need to download an Ethereum wallet
6. No, it only needs the currency supported by the wallet. If the currency not supported by the wallet is transferred in, the coin will be lost. The charging address of each coin is different. Moreover, the wallet is a small platform. I feel that it is not as safe as ZB, but some personal wallets can be used with some amount
7. This needs to be recharged, but we must pay attention to the risk. This chain is not particularly mainstream. It may be the capital disk or counterfeit currency.
8. If you want to query the transaction records on the main network, you can use Etherscan. However, if you build your own private chain, how should you query the transaction records
the answer is that you need to listen to the logs on the chain, save them in the database, and then query them in the database. For example:
< pre t = "code" L = "Java" > varaddr = & quot& quot;< br />varfilter=web3.eth.filter({fromB lock:0 ,toBlock:' latest', address:addr });< br />filter.get(function(err,transactions){
transactions.forEach(function(tx){
vartxInfo=web3.eth.getTransaction(tx.transactionHash);
/ / at this time, the transaction information txinfo can be stored in the database
})< br />});
Web3. Eth. Filter() is used to monitor the log on the chain, and Web3. Eth. Gettransaction() is used to extract the information of the specified transaction. Once the transaction information is obtained, it can be stored in the database for query
recommend a practical introction, you can see: Ethereum tutorial
9. The Internet has just begun, intelligent life coming
