web3.js vs. ethers.js https://medium.com/l4-media/announcing-ethers-js-a-web3-alternative-6f134fdd06f3 One major difference between ethers.js and web3 is how they handle key management and ...

From Solidity v0.8.0 Breaking Changes https://docs.soliditylang.org/en/v0.8.0/080-breaking-changes.html ABI coder v2 is activated by default. So it is not experimental, but standard feature since ...

Or just use pragma solidity ^0.8.0; From Solidity v0.8.0 Breaking Changes https://docs.soliditylang.org/en/v0.8.0/080-breaking-changes.html ABI coder v2 is activated by default. So it is not ...

Thanks to @zmy comment, pointing to https://www.npmjs.com/package/openzeppelin-solidity. 2.3.0 is earliest version on npm registry as "@openzeppelin/contracts" https://www.npmjs.com/package/@...

pyethereum was Python implementation of Ethreum, and it also had references to Electrum (v,r,s) is the raw Electrum-style signature of the transaction without the signature made with the private key ...

Well, the issue was solved by identifying that it was name of main balance currency on the HECO testnetwork, then removing the name of currency helped to overcome this bug. MetaMask Settings -> ...

Variable in contract by default are of storage, i.e. they are state variables. And new struct default allocation within function is memory. Hence the compiler warning.