Solana: any pubkey as a function signer

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Here is an example article on how to create a function with any public key as a subscriber for a function in Solana:

Creating a function with any public key as a signer in Solana

In the world of blockchain, having different types of accounts (or „signers“) can be crucial when creating complex programs. A common scenario is when you want to create a function that requires confirmation by two or more signatures. In this article, we’ll look at how to achieve this in Solana using Anchor.

Basics

Before we get to the code, let’s quickly review some basic concepts:

  • A „signer“ is an account that has a private key (also known as a „public key“) and can be used to sign messages or contracts.
  • With Anchor, you don’t need to specify the type of subscriber in your program. Instead, you will use the „declare_id!“ macro to declare it.

Example Code

Here’s an example code snippet that shows how to create a function with any public key as a signer:

Rust

use anchor_lang::prelude::*;

declare_identifier!(„5Fb2dXrY8jW4K9yfB6JhZz1aPpUu3oK9kqCZcR7eJLs“);

#[program]

pub fn create_function(

#[-parameter]

pub new_value: string,

#[parameter]

pub pubkey1: Public key,

#[parameter]

pub pubkey2: Public key,

) -> Result {

let mut account = [

Signer::new(&publickey1, 1),

Subscriber::new(&pubkey2, 1),

];

let (address, account) = self.signer_sign_out(account)?;

// Now we can use the signed address and account to call our function

#[resolve(dead_code)]

pub fn my_function(

#[parameter]

param_value: String,

) -> Result {

let result = Account::call(&address, „my_function“, &param_value)?;

good (result)

}

}

In this example, we created acreate_functionprogram that takes three parameters:

  • new_value: the string returned by our function
  • pubkey1andpubkey2: these are two public keys. In Anchor, you can use any public key as a subscriber for your functions.
  • The functionsigner_sign_outreturns a tuple(address, account), whereaddressis the signed address andaccountis the signed account.

When we call our functionmy_functionwe passparam_value: „hello“. Sincepubkey1andpubkey2are arbitrary public keys as signers, we can use them to sign this parameter value. The functionAccount::callreturns a result of typeResult, which indicates whether the call was successful.

Appendix

Solana: Having any pubkey as signer for a function

In this article, we looked at how to create a function with any public key as a signer in Solana using Anchor. By using thedeclare_id!macro and usingSigner::new` to create signers, you can write functions that require multiple signers to verify their execution. Be sure to protect your code by following the guidelines for signing and verifying signatures.

Hope this helps! Let me know if you have any questions or need further clarification on any of the concepts discussed in this article.

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