Ethereum token batch query

1. The digital currency

issued based on Ethereum public chain should be observed according to the price trend of the platform.

2.

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

3. Just focus:
you can't retrieve your assets through Ethereum block query
think too much
if you want to check the real estate,

you can go to the real estate transaction registration center.

4. Generally, those with wallets have to be hung in the trading market to get a price. Generally, the trading market is external, not the software, so there is no price

5. 1. Security system: Hot wallet, operation wallet, cold wallet three-tier wallet system, DDoS Defense, distributed structure, flow cleaning, intelligent blocking, penetration and intrusion prevention, daily security, operation and maintenance system, background operation administrator account setting, etc.
2. Risk control system: strict risk control system, asset abnormal alarm, timely detection of risk events, customizable script, Real time observation platform data. Intelligent monitoring of asset circulation, abnormal alarm, withdrawal blocking. The exchange looks simple, but when it comes to development, there are still many needs to be sorted out. We've been doing this for 12 years, so it's clear

6. < UL >

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