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Call a view function of an Ethereum Smart Contract using a program written in C

my attempt is to call a view function to reatrieve some data from a contract on the Blockchain using a C program. I do have the interface of the contract. I think i need to performe two things in ...
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Standard work-around for using a Solidity constant array (which is not supported) in pure function?

I have an array in my contract like this and a pure method which uses it like this (simplified exmaple because my real exmaple is many more lines): uint[16] constant x = [10, 2, 6, 42, 19, 5, 4, 36, ...
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Controlling access to functions with VIEW visibility with signed transactions?

Controlling access to functions that require ETH is straight forward because you get an address you can trust because it has been signed and verified, and therefore upi can use for access control ...