1

I'm looking into using the transfer hook from token-2022 to run some logic whenever my custom spl-token is transferred. I came this Github link and while it helps, I have a lot of questions. Like for instance, does the program have to only have this one instruction for the transfer hook or can I add this instruction to a program I'm already writing and pass that program ID into the CLI when I'm creating the token-2022 and it'll just "know" which instruction to use? Ideally, I'd like to avoid deploying 2 programs if I can.

Improve this question

1 Answer 1

Reset to default
3

can I add this instruction to a program I'm already writing and pass that program ID into the CLI when I'm creating the token-2022 and it'll just "know" which instruction to use

This is pretty much how it works, yeah!

Basically, there's an interface for any "transfer hook program" and it has two instructions:

  • InitializeExtraAccountMetaList Set up additional required accounts for a transfer
  • Execute Do said transfer

Anytime you send a Transfer instruction to Token2022 and the mint being transferred has a transfer hook program, Token2022 is going to CPI to the hook program's Execute instruction.

Since it's an interface, we can do that since the instruction layout is always the same.

A hook program can have any number of other instructions, as long as it at least has TransferHookInstruction::Execute.

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.