Infura getLogs returns an empty result

I’m writing a crypto based system with PHP on Infura, and now I am coding a script to retrieve logs for a specific address. This is my code: $ch = curl_init($my_server_url); $data = array( ‘jsonrpc’ => ‘2.0’, ‘id’ => 1, ‘method’ => ‘eth_getLogs’, ‘params’ => array(array(‘address’=>’0x7d8f5F4ACa6Ca7Eb857A9F36d46b0aA715a88849’)) ); $payload = json_encode($data); curl_setopt($ch, CURLOPT_POSTFIELDS, $payload); curl_setopt($ch, CURLOPT_HTTPHEADER,…

It possible to hard fork a private network without resyncing chain from scratch?

I am able to hard fork my private chain into first Constantinople and than to Istanbul, please see the answer for it. My approach is: I have updated geth to its highest version I have kept the go-ethereum/params/config.go file as it is I have updated the genesis.json file by adding “constantinopleBlock”: 2862930, “petersburgBlock”: 2862930, and…

Is it possible to mine bitcoins faster on CPUs with this strategy?

This guy on bitcointalk.org suggested a potentially faster method for mining bitcoins using CPUs: https://bitcointalk.org/index.php?topic=265759.0 To quote from the author: “Rather than computationally solving for SHA256(SHA256(block_header)), the approach is to solve it symbolically. What I mean by this is, rather than treating the block header input bits as 0 or 1, treat each input bit…

Getting TypeError: “send” and “transfer” are only available for objects of type “address payable”, not “address”

Working on this Udemy course for Ethereum and i keep getting the error mentioned in the title of the question. For reference i have checked out the answers on questions: 1, 2 and 3. But the error persists. The contract goes like this: pragma solidity >=0.4.22 <0.6.0; contract Lottery { address public manager; address[] public…