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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 ...


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, ...

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