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Length of a Challenge in Challenge and Response Protocol

Lets consider a challenge and response protocol with the following setup.

Two entities $A$ and $B$. $A$ is generating the challenge and $B$ is generating the response using a digital signature scheme. Lets suppose, that $A$ already has the certificate of $B$. So the procedure is as follows:

  1. $B$ wants to access some service, that $A$ provides.
  2. $A$ would like to know whether $B$ is authorized. Therefore, $A$ generates a challenge ch and sends it over to $B$.
  3. $B$ is generating a response, by signing the ch with its private key and sending the signature over to $A$.
  4. $A$ verifies the received response using the public key inside the available certificate.

This is just a common challenge and response procedure.

Question: How long shall the challenge be? If the challenge is to small, it repeats in a short amount of time. Are there any common methods that are "good-practice" in order to determine a suitable length?

Does this have anything to do with the security level of 128-bit that shall be satisfied in any case?

Bitcoin paper wallet and Bitcoincash withdrawal?

Let’s say I have a bitcoin paper wallet with a public and a private key, with an amount of X bitcoin on it. On the 25th of November, the hardfork of bitcoin gold will take place, so I will get the same amount of bitcoin gold. The question is, how I will be able to::Listen

Let’s say I have a bitcoin paper wallet with a public and a private key, with an amount of X bitcoin on it. On the 25th of November, the hardfork of bitcoin gold will take place, so I will get the same amount of bitcoin gold.

The question is, how I will be able to withdraw only bitcoin gold from that paper wallet as I have only one public and private key as they are bound to a bitcoin wallet?

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Length of a Challenge in Challenge and Response Protocol

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