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It's the innermost, or nearest/most recent caller. Referring to your example: From A's perspective, it is the txn sender, B, or any other contract that called it (entirely possible). In practice, it may be to A's advantage to check that the caller is B and only B. From B's perspective, it is the txn sender, C, or any other contract that called it. In ...


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Let's take this snippet, which you can deploy for yourself on Remix: pragma solidity 0.5.10; contract A { event LogMsgSender(address who); function callMe() public { emit LogMsgSender(msg.sender); } } contract B { function callMe(address a) public { A(a).callMe(); } } contract C { function callMe(address a, ...


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Let's take for example the following simple storage contract: pragma solidity ^0.5.6; contract SimpleStorage { uint storedData; function set(uint x) public { storedData = x; } function get() public view returns (uint) { return storedData; } } You can send a transaction to a (already deployed) smart contract with the ...


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I think you can use createFunctionCallTransaction to make the smart contract call transaction like below link https://docs.web3j.io/transactions.html#transacting-with-a-smart-contract Then use RawTransactionManager to sign and send the tnx https://github.com/web3j/web3j/blob/39df8f62c074d64bd88a1154719a49b06644ffb2/core/src/main/java/org/web3j/tx/...


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From the Solidity documentation: The compiler does not enforce yet that a view method is not modifying state. It raises a warning though. Declaring a method as view will indicate in the ABI that the method is intended to be accessed via a call rather than a transaction, but this behavior is in no way enforced. eth_call executes a transaction locally ...


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let stringABI = 'your abi string'; let parsedABI = JSON.parse(stringABI); let contract = new Web3.eth.Contract(parsedABI, '0xd26114cd6EE289AccF82350c8d8487fedB8A0C07'); console.log(contract);


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For authorization you can use dappauth from Dapper Labs. I have been using it with Infura and works fine.


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