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if I finish following the tutorial and build a signed TXN with these wrong R+S values, the txn works This seems to suggest the signing by secp256k1.ecdsaSign is correct, but just not deterministic, i.e. it changes every time you sign, even with the same key and data. Notice the tutorial uses private_key.sign_deterministic, so, to produce the same result, ...


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Most of the dApps are fully open source, due to their nature of transparent development on Github. dApps have links to respective Github organisations on their homepages. You can find dApps for example here: https://walletconnect.org/apps And here: https://defipulse.com/ If you want to weed out a particular example check e.g. Uniswap and Aave: https://...


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Solved rolling back open zeppelin to 2.5.1 and using pragma 0.5.0, drizzle may have some incompatibility issues with the last open zeppelin version


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I forgot to specify in the call method the account from I was sending the transaction from. checkAccount = async () => { const accounts = await web3.eth.getAccounts(); const data = await tacosavings.methods.getAccount().call({ from: accounts[0] }); const { 0: money, 1: timeLeft } = data; this.setState({ message: `Your ...


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A truffle-contract object, which represents the DToken contract deployed on the network. This object exposes all the public and external functions of the DToken contract.


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Your syntax (web3.eth.contract with a lower-case c) implies that you're using web3.js v0.x. However, web3.eth.defaultChain is supported only starting from web3.js v1.x.


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It is same as a get call that you make with a function written in the smart contract using api like web3. You will have to write a function to return the details when RFID card number is passed as an argument to the function.


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