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If I create a Smart Contract that pays users for sharing their data, how can I ever update this smart contract in the case it has an error Although it is not possible to upgrade the code of your already deployed smart contract, it is possible to set-up a proxy contract architecture that will allow you to use new deployed contracts as if your main logic had ...


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Your test uses a beforeEach() to set up new, blank contract to play with. That's an agreeable thing so no test is dependent on any other. The function uses a modulo to pick a row and then forges ahead to work, but if there are players, because enter() wasn't called first, then the modulo will be zero and it will try to access row 0 in players and that ...


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Blockchain ensures that you can't rewrite the past, so you have to dispense with the idea of modifying it. pays users for sharing their data, how can I ever update this smart contract It doesn't sound like you want to change the contract. Rather, you want your users to agree to a process whereby they are paid the current prevailing rate, whatever that ...


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Change this: await contract.methods.transferOwnership(targetOwnerAddr).call({from: ownerAddr}); To this: await contract.methods.transferOwnership(targetOwnerAddr).send({from: ownerAddr}); And of course, you'll need to make sure that account ownerAddr is unlocked on the node that you're communicating with... Please read some more about call and send.


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As @Chan-Ho Suh suggested in the comment you are looking through the debug of the transaction of the contract being deployed. As in your initial question, there is no constructor, there is nothing to step through. The problem is that you are not calling the function LoopCounter after deploying the contract in your step 5, you need to enter a value and click ...


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You've declared function misbehaviorJudge. But you've implemented function misbeaviorJudge. So the way I see it, you are trying to invoke an unimplemented function. A couple of ways for you to avoid a similar issue next time (more precisely, convert it from a hard-to-investigate runtime problem into an easy-to-investigate compilation problem): Option #1 -...


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I maintain a Python library called py-solc-x that allows you to install and use multiple versions of solc at the same time. It supports versions >=0.4.11. I've included some code examples below to give an idea of how it works. Installing a new version of solc: >>> from solcx import install_solc >>> install_solc('v0.4.25') Checking ...


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There are a couple of ways to do this and the Solidity documentation has a page on it: Keep in mind you have the option to use the "cli binary" version (solc-bin) which is quite faster than the solcjs ( javascript implementation ). In addition to all of these, if you use truffle, you can specify which version you would like to use with it in your truffle-...


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