scaffold deregister

src/processor/deregister.rs

@@ -0,0 +1,36 @@
+use solana_program::{
+    account_info::AccountInfo, entrypoint::ProgramResult, program_error::ProgramError,
+    pubkey::Pubkey, system_program,
+};
+
+use crate::{instruction::RegisterArgs, loaders::*};
+
+/// Register generates a new hash chain for a prospective miner. Its responsibilities include:
+/// 1. Initialize a new proof account.
+/// 2. Generate an initial hash from the signer's key.
+///
+/// Safety requirements:
+/// - Register is a permissionless instruction and can be invoked by any singer.
+/// - Can only succeed if the provided proof acount PDA is valid (associated with the signer).
+/// - Can only succeed once per signer.
+/// - The provided system program must be valid.
+pub fn process_deregister<'a, 'info>(
+    _program_id: &Pubkey,
+    accounts: &'a [AccountInfo<'info>],
+    data: &[u8],
+) -> ProgramResult {
+    // Load accounts
+    let [signer, proof_info, system_program] = accounts else {
+        return Err(ProgramError::NotEnoughAccountKeys);
+    };
+    load_signer(signer)?;
+    load_proof(proof_info, signer.key, true)?;
+    load_program(system_program, system_program::id())?;
+
+    // TODO Ensure proof.balance == 0
+    // TODO Send lamports to signer
+    // TODO Realloc data to 0
+    // TODO Reassign back to system program
+
+    Ok(())
+}