Ethereum Questions

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Web3.givenProvider returns null

I'm creating a react-app that interacts with an ethereum private blockchain running with geth on rpcport 8545. i am thus using web3.js to
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How can I startup bootnode?

I'm trying to start up bootnode, but i got couldn't get connect information. it's suppose to be like this bootnode
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Time delay in Truffle Tests

I am writing test cases for my contract and have to delay the assertion check because it is time sensitive. getcompletedcampaigns() will have the
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How to find erc20 tokens balance

I'm trying to find the balance of erc20 tokens (such as tether) of specific addresses. actually, i hope to find an api that works like
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