Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
1

That's because receiver and _receiver need to be payable. I've set an address of the Javascript VM of Remix as the approver. pragma solidity ^0.5.0; contract ApprovalContract { address public sender; address payable public receiver; address public constant approver = 0xCA35b7d915458EF540aDe6068dFe2F44E8fa733c; function deposit(address ...


1

I will try to summarize: On-chain Something existing in the public blockchain. Side-chain Something existing in the different public blockchain with observable relationships between chains like bridges. Cosmos and Polkadot are projects for bridging data between public blockchains. Off-chain Something not visible on the public blockchain. But usually, ...


Only top voted, non community-wiki answers of a minimum length are eligible