ParserError: Expected ‘(‘ but got identifier constructor HelloEthereumString() public

pragma solidity ^0.5.0; contract HelloEthereumString { string public lastCallerName; // Storage variable for holding the mapping(address => string) addressNames; // Event gets emitted everytime someone calls the hello function event HelloInvoked(string indexed name); constructor HelloEthereumString() public { // constructor lastCallerName = ‘not-set’; } function hello(string name) public { // Invoke the event HelloInvoked(name); // Add…

Create P2SH transaction 1-1

I’m trying to create a transaction P2SH 1-1 in testnet. I obtain an address from https://segwitaddress.org/?testnet=true. (2MsMajWUMmW7BTw6Lw4L3qvZ6rcHgGHHas4) Then I create the transaction with Output script like this: “5141”$PUBLIC_KEY”51AE” Where $PUBLIC_KEY is not compressed. ( I tried even with compressed) 51410487c7d95b6334ad37dfb6d423313c580476035d680ec86be444c3c52da95615e15cd044d7d1332e02c33b80fc8e6d6cc94b6f9d618419956fcbbedfc25c16b7e151AE I applied SHA256 and ripemd160, and I get the redeem script 5a3f197d7f9cacc2794120eb169ee3beafa677b1 Add it to…

What are private variables in solidity?

The following variables here, assuming solidity 4.24 or later. mapping(something => something) private yourmapping; bool private yourbool; address private youraddress; uint256 private yournumber; function dosomething() private { *do stuff* } I see quite a few questions about hiding stuff in solidity. I’m not interested in that. My understanding of private variables is that they do…

How to find bottleneck in geth sync?

I’m trying to benchmark geth full sync. Here are my current machine specs: Google Cloud 16 vCPU 14 Gb RAM 700 Gb NVMe SSD RAID 0 772k read/258k write IOPS 6+ Gbps network Launching with following docker-compose.yml version: ‘2’ services: geth: image: ethereum/client-go command: “–syncmode full –nat=extip:x.x.x.x –cache=12288 –nousb” restart: always stop_grace_period: 4m stop_signal: SIGINT…