diff --git a/api/src/instruction.rs b/api/src/instruction.rs
index 5d00d43..d402b69 100644
--- a/api/src/instruction.rs
+++ b/api/src/instruction.rs
@@ -256,12 +256,13 @@ pub fn mine(signer: Pubkey, bus: Pubkey, solution: Solution) -> Instruction {
 }
 
 /// Builds an open instruction.
-pub fn open(signer: Pubkey, miner: Pubkey) -> Instruction {
+pub fn open(signer: Pubkey, miner: Pubkey, payer: Pubkey) -> Instruction {
     let proof_pda = Pubkey::find_program_address(&[PROOF, signer.as_ref()], &crate::id());
     Instruction {
         program_id: crate::id(),
         accounts: vec![
             AccountMeta::new(signer, true),
+            AccountMeta::new(payer, true),
             AccountMeta::new_readonly(miner, false),
             AccountMeta::new(proof_pda.0, false),
             AccountMeta::new_readonly(solana_program::system_program::id(), false),
diff --git a/api/src/lib.rs b/api/src/lib.rs
index d03a02d..514f1e3 100644
--- a/api/src/lib.rs
+++ b/api/src/lib.rs
@@ -10,4 +10,4 @@ pub(crate) use ore_utils as utils;
 use solana_program::declare_id;
 
 // declare_id!("mineRHF5r6S7HyD9SppBfVMXMavDkJsxwGesEvxZr2A");
-declare_id!("7LARaw2QJCftkGR14QVV6NSj3MFZM9iUL4GfSKySXphJ");
+declare_id!("CWZk6C3fGbpr1UprdCGaLvnW2ogh7okEmeXaS161RxUg");
diff --git a/program/src/open.rs b/program/src/open.rs
index fc6e570..4535e8c 100644
--- a/program/src/open.rs
+++ b/program/src/open.rs
@@ -33,10 +33,12 @@ pub fn process_open<'a, 'info>(
     let args = OpenArgs::try_from_bytes(data)?;
 
     // Load accounts
-    let [signer, miner_info, proof_info, system_program, slot_hashes_info] = accounts else {
+    let [signer, payer_info, miner_info, proof_info, system_program, slot_hashes_info] = accounts
+    else {
         return Err(ProgramError::NotEnoughAccountKeys);
     };
     load_signer(signer)?;
+    load_signer(payer_info)?;
     load_system_account(miner_info, false)?;
     load_uninitialized_pda(
         proof_info,
@@ -54,7 +56,7 @@ pub fn process_open<'a, 'info>(
         8 + size_of::<Proof>(),
         &[PROOF, signer.key.as_ref(), &[args.bump]],
         system_program,
-        signer,
+        payer_info,
     )?;
     let clock = Clock::get().or(Err(ProgramError::InvalidAccountData))?;
     let mut proof_data = proof_info.data.borrow_mut();