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Where are contract functions implemented on bscscan verified contract

The following functions are defined on a contract posted on BSC scan; however, the implementations don’t seem to be available.

contract Acc {     function acc_Transfer(address from, address to, uint256 amount) public;     function acc_balanceOf(address who) public view returns (uint256);     function acc_setup(address token, uint256 supply) public returns (bool); } 

How is this possible?

Here is the link to the contract on bscscan: https://bscscan.com/address/0x52dff9c835dbf7675e9338ddcfdafdbd83cf9ebd#code

Extracting PRF with two keys and the same input

An extracting PRF ${f_k}_k$ is such that for any inputs subset $mathcal{X}$ with enough min-entropy, ${k, f_k(x)}$ is computationally indistinguishable from ${k, y}$ where $k, x, y$ are respectively sampled uniformly randomly from the set of keys, $mathcal{X}$ and the set of images. I’m thinking of a security property for PRF that would (informally) ensure::Listen

An extracting PRF ${f_k}_k$ is such that for any inputs subset $mathcal{X}$ with enough min-entropy, ${k, f_k(x)}$ is computationally indistinguishable from ${k, y}$ where $k, x, y$ are respectively sampled uniformly randomly from the set of keys, $mathcal{X}$ and the set of images.

I’m thinking of a security property for PRF that would (informally) ensure that no polynomial adversary can, given two keys $k_1, k_2$, distinguish between two images of the same point and two random images (where each image is computed with a different key).

More formally: ${k_1, k_2, f_{k_1}(x), f_{k_2}(x)} approx_c {k_1, k_2, y_1, y_2}$.

I don’t think I’ve seen that anywhere, but maybe someone has already constructed a scheme with such a property. Or it stem from another property and I missed it.

Does someone knows some something about it ?

Where are contract functions implemented on bscscan verified contract

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