diff --git a/programs/mmm/src/instructions/admin/create_pool.rs b/programs/mmm/src/instructions/admin/create_pool.rs
index bf594c8..6e457e7 100644
--- a/programs/mmm/src/instructions/admin/create_pool.rs
+++ b/programs/mmm/src/instructions/admin/create_pool.rs
@@ -26,6 +26,7 @@ pub struct CreatePool<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
     /// CHECK: the cosigner can be set as owner if you want optional cosigner
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         init,
diff --git a/programs/mmm/src/instructions/admin/set_shared_escrow.rs b/programs/mmm/src/instructions/admin/set_shared_escrow.rs
index c6d0ab8..dd2c6d8 100644
--- a/programs/mmm/src/instructions/admin/set_shared_escrow.rs
+++ b/programs/mmm/src/instructions/admin/set_shared_escrow.rs
@@ -10,6 +10,7 @@ pub struct SetSharedEscrowArgs {
 pub struct SetSharedEscrow<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/admin/sol_close_pool.rs b/programs/mmm/src/instructions/admin/sol_close_pool.rs
index e6fb96a..04780cb 100644
--- a/programs/mmm/src/instructions/admin/sol_close_pool.rs
+++ b/programs/mmm/src/instructions/admin/sol_close_pool.rs
@@ -4,6 +4,7 @@ use super::*;
 pub struct SolClosePool<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/admin/update_allowlists.rs b/programs/mmm/src/instructions/admin/update_allowlists.rs
index 5e17d10..d953fb2 100644
--- a/programs/mmm/src/instructions/admin/update_allowlists.rs
+++ b/programs/mmm/src/instructions/admin/update_allowlists.rs
@@ -9,6 +9,7 @@ pub struct UpdateAllowlistsArgs {
 #[instruction(args:UpdateAllowlistsArgs)]
 pub struct UpdateAllowlists<'info> {
     #[account(mut)]
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     /// CHECK: Owner is only used for seed derivation. Cosigner has_one constraint is checked in the pool account.
     pub owner: UncheckedAccount<'info>,
diff --git a/programs/mmm/src/instructions/admin/update_pool.rs b/programs/mmm/src/instructions/admin/update_pool.rs
index 3bf09e7..7cdd63e 100644
--- a/programs/mmm/src/instructions/admin/update_pool.rs
+++ b/programs/mmm/src/instructions/admin/update_pool.rs
@@ -20,6 +20,7 @@ pub struct UpdatePoolArgs {
 pub struct UpdatePool<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/ext_vanilla/ext_deposit_sell.rs b/programs/mmm/src/instructions/ext_vanilla/ext_deposit_sell.rs
index b414760..e93cf1f 100644
--- a/programs/mmm/src/instructions/ext_vanilla/ext_deposit_sell.rs
+++ b/programs/mmm/src/instructions/ext_vanilla/ext_deposit_sell.rs
@@ -19,6 +19,7 @@ use crate::{
 pub struct ExtDepositeSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
       mut,
diff --git a/programs/mmm/src/instructions/ext_vanilla/ext_withdraw_sell.rs b/programs/mmm/src/instructions/ext_vanilla/ext_withdraw_sell.rs
index 5c2d38e..82919bd 100644
--- a/programs/mmm/src/instructions/ext_vanilla/ext_withdraw_sell.rs
+++ b/programs/mmm/src/instructions/ext_vanilla/ext_withdraw_sell.rs
@@ -19,6 +19,7 @@ use crate::{
 pub struct ExtWithdrawSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/ext_vanilla/sol_ext_fulfill_buy.rs b/programs/mmm/src/instructions/ext_vanilla/sol_ext_fulfill_buy.rs
index 2618898..d2c2572 100644
--- a/programs/mmm/src/instructions/ext_vanilla/sol_ext_fulfill_buy.rs
+++ b/programs/mmm/src/instructions/ext_vanilla/sol_ext_fulfill_buy.rs
@@ -39,6 +39,7 @@ pub struct ExtSolFulfillBuy<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(mut)]
     /// CHECK: we will check that the referral matches the pool's referral
diff --git a/programs/mmm/src/instructions/ext_vanilla/sol_ext_fulfill_sell.rs b/programs/mmm/src/instructions/ext_vanilla/sol_ext_fulfill_sell.rs
index 4b09f3a..4636dc8 100644
--- a/programs/mmm/src/instructions/ext_vanilla/sol_ext_fulfill_sell.rs
+++ b/programs/mmm/src/instructions/ext_vanilla/sol_ext_fulfill_sell.rs
@@ -34,6 +34,7 @@ pub struct ExtSolFulfillSell<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     /// CHECK: we will check that the referral matches the pool's referral
     #[account(mut)]
diff --git a/programs/mmm/src/instructions/mip1/mip1_deposit_sell.rs b/programs/mmm/src/instructions/mip1/mip1_deposit_sell.rs
index b84de87..8cdaf5d 100644
--- a/programs/mmm/src/instructions/mip1/mip1_deposit_sell.rs
+++ b/programs/mmm/src/instructions/mip1/mip1_deposit_sell.rs
@@ -23,6 +23,7 @@ use crate::{
 pub struct Mip1DepositSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/mip1/mip1_withdraw_sell.rs b/programs/mmm/src/instructions/mip1/mip1_withdraw_sell.rs
index f6b0a2b..4d0651d 100644
--- a/programs/mmm/src/instructions/mip1/mip1_withdraw_sell.rs
+++ b/programs/mmm/src/instructions/mip1/mip1_withdraw_sell.rs
@@ -24,6 +24,7 @@ use crate::{
 pub struct Mip1WithdrawSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/mip1/sol_mip1_fulfill_buy.rs b/programs/mmm/src/instructions/mip1/sol_mip1_fulfill_buy.rs
index 9d02849..2b0347a 100644
--- a/programs/mmm/src/instructions/mip1/sol_mip1_fulfill_buy.rs
+++ b/programs/mmm/src/instructions/mip1/sol_mip1_fulfill_buy.rs
@@ -38,6 +38,7 @@ pub struct SolMip1FulfillBuy<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(mut)]
     /// CHECK: we will check that the referral matches the pool's referral
diff --git a/programs/mmm/src/instructions/mip1/sol_mip1_fulfill_sell.rs b/programs/mmm/src/instructions/mip1/sol_mip1_fulfill_sell.rs
index ad38b4e..0db15bb 100644
--- a/programs/mmm/src/instructions/mip1/sol_mip1_fulfill_sell.rs
+++ b/programs/mmm/src/instructions/mip1/sol_mip1_fulfill_sell.rs
@@ -41,6 +41,7 @@ pub struct SolMip1FulfillSell<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     /// CHECK: we will check that the referral matches the pool's referral
     #[account(mut)]
diff --git a/programs/mmm/src/instructions/mpl_core_asset/mpl_core_deposit_sell.rs b/programs/mmm/src/instructions/mpl_core_asset/mpl_core_deposit_sell.rs
index 5cf0cba..9ba92bc 100644
--- a/programs/mmm/src/instructions/mpl_core_asset/mpl_core_deposit_sell.rs
+++ b/programs/mmm/src/instructions/mpl_core_asset/mpl_core_deposit_sell.rs
@@ -23,6 +23,7 @@ pub struct MplCoreDepositSellArgs {
 pub struct MplCoreDepositSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/mpl_core_asset/mpl_core_withdraw_sell.rs b/programs/mmm/src/instructions/mpl_core_asset/mpl_core_withdraw_sell.rs
index 1d2b748..41326d3 100644
--- a/programs/mmm/src/instructions/mpl_core_asset/mpl_core_withdraw_sell.rs
+++ b/programs/mmm/src/instructions/mpl_core_asset/mpl_core_withdraw_sell.rs
@@ -19,6 +19,7 @@ pub struct MplCoreWithdrawSellArgs {
 pub struct MplCoreWithdrawSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/mpl_core_asset/sol_mpl_core_fulfill_buy.rs b/programs/mmm/src/instructions/mpl_core_asset/sol_mpl_core_fulfill_buy.rs
index 69bdb7e..e38f3f7 100644
--- a/programs/mmm/src/instructions/mpl_core_asset/sol_mpl_core_fulfill_buy.rs
+++ b/programs/mmm/src/instructions/mpl_core_asset/sol_mpl_core_fulfill_buy.rs
@@ -38,6 +38,7 @@ pub struct SolMplCoreFulfillBuy<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(mut)]
     /// CHECK: we will check that the referral matches the pool's referral
diff --git a/programs/mmm/src/instructions/mpl_core_asset/sol_mpl_core_fulfill_sell.rs b/programs/mmm/src/instructions/mpl_core_asset/sol_mpl_core_fulfill_sell.rs
index feea84b..c04e6d8 100644
--- a/programs/mmm/src/instructions/mpl_core_asset/sol_mpl_core_fulfill_sell.rs
+++ b/programs/mmm/src/instructions/mpl_core_asset/sol_mpl_core_fulfill_sell.rs
@@ -38,6 +38,7 @@ pub struct SolMplCoreFulfillSell<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     /// CHECK: we will check that the referral matches the pool's referral
     #[account(mut)]
diff --git a/programs/mmm/src/instructions/ocp/ocp_deposit_sell.rs b/programs/mmm/src/instructions/ocp/ocp_deposit_sell.rs
index 119b929..8ffeab9 100644
--- a/programs/mmm/src/instructions/ocp/ocp_deposit_sell.rs
+++ b/programs/mmm/src/instructions/ocp/ocp_deposit_sell.rs
@@ -19,6 +19,7 @@ use crate::{
 pub struct OcpDepositSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/ocp/ocp_withdraw_sell.rs b/programs/mmm/src/instructions/ocp/ocp_withdraw_sell.rs
index bfbec95..acb02e4 100644
--- a/programs/mmm/src/instructions/ocp/ocp_withdraw_sell.rs
+++ b/programs/mmm/src/instructions/ocp/ocp_withdraw_sell.rs
@@ -19,6 +19,7 @@ use crate::{
 pub struct OcpWithdrawSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/ocp/sol_ocp_fulfill_buy.rs b/programs/mmm/src/instructions/ocp/sol_ocp_fulfill_buy.rs
index 826a5dd..9b61a12 100644
--- a/programs/mmm/src/instructions/ocp/sol_ocp_fulfill_buy.rs
+++ b/programs/mmm/src/instructions/ocp/sol_ocp_fulfill_buy.rs
@@ -36,6 +36,7 @@ pub struct SolOcpFulfillBuy<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(mut)]
     /// CHECK: we will check that the referral matches the pool's referral
diff --git a/programs/mmm/src/instructions/ocp/sol_ocp_fulfill_sell.rs b/programs/mmm/src/instructions/ocp/sol_ocp_fulfill_sell.rs
index 89598c9..3465a3c 100644
--- a/programs/mmm/src/instructions/ocp/sol_ocp_fulfill_sell.rs
+++ b/programs/mmm/src/instructions/ocp/sol_ocp_fulfill_sell.rs
@@ -40,6 +40,7 @@ pub struct SolOcpFulfillSell<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     /// CHECK: we will check that the referral matches the pool's referral
     #[account(mut)]
diff --git a/programs/mmm/src/instructions/vanilla/deposit_sell.rs b/programs/mmm/src/instructions/vanilla/deposit_sell.rs
index f364c6e..c5a08b1 100644
--- a/programs/mmm/src/instructions/vanilla/deposit_sell.rs
+++ b/programs/mmm/src/instructions/vanilla/deposit_sell.rs
@@ -22,6 +22,7 @@ pub struct DepositSellArgs {
 pub struct DepositSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/vanilla/sol_deposit_buy.rs b/programs/mmm/src/instructions/vanilla/sol_deposit_buy.rs
index 1cdb833..b78b736 100644
--- a/programs/mmm/src/instructions/vanilla/sol_deposit_buy.rs
+++ b/programs/mmm/src/instructions/vanilla/sol_deposit_buy.rs
@@ -13,6 +13,7 @@ pub struct SolDepositBuyArgs {
 pub struct SolDepositBuy<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/vanilla/sol_fulfill_buy.rs b/programs/mmm/src/instructions/vanilla/sol_fulfill_buy.rs
index c9927e4..2e0ec96 100644
--- a/programs/mmm/src/instructions/vanilla/sol_fulfill_buy.rs
+++ b/programs/mmm/src/instructions/vanilla/sol_fulfill_buy.rs
@@ -41,6 +41,7 @@ pub struct SolFulfillBuy<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(mut)]
     /// CHECK: we will check that the referral matches the pool's referral
diff --git a/programs/mmm/src/instructions/vanilla/sol_fulfill_sell.rs b/programs/mmm/src/instructions/vanilla/sol_fulfill_sell.rs
index c136b4e..ced157e 100644
--- a/programs/mmm/src/instructions/vanilla/sol_fulfill_sell.rs
+++ b/programs/mmm/src/instructions/vanilla/sol_fulfill_sell.rs
@@ -38,6 +38,7 @@ pub struct SolFulfillSell<'info> {
     /// CHECK: we will check the owner field that matches the pool owner
     #[account(mut)]
     pub owner: UncheckedAccount<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     /// CHECK: we will check that the referral matches the pool's referral
     #[account(mut)]
diff --git a/programs/mmm/src/instructions/vanilla/sol_withdraw_buy.rs b/programs/mmm/src/instructions/vanilla/sol_withdraw_buy.rs
index 92ec855..ca0079a 100644
--- a/programs/mmm/src/instructions/vanilla/sol_withdraw_buy.rs
+++ b/programs/mmm/src/instructions/vanilla/sol_withdraw_buy.rs
@@ -16,6 +16,7 @@ pub struct SolWithdrawBuyArgs {
 pub struct SolWithdrawBuy<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/mmm/src/instructions/vanilla/withdraw_sell.rs b/programs/mmm/src/instructions/vanilla/withdraw_sell.rs
index 0017228..b7ad6f5 100644
--- a/programs/mmm/src/instructions/vanilla/withdraw_sell.rs
+++ b/programs/mmm/src/instructions/vanilla/withdraw_sell.rs
@@ -22,6 +22,7 @@ pub struct WithdrawSellArgs {
 pub struct WithdrawSell<'info> {
     #[account(mut)]
     pub owner: Signer<'info>,
+    #[account(constraint = owner.key() != cosigner.key() @ MMMErrorCode::InvalidCosigner)]
     pub cosigner: Signer<'info>,
     #[account(
         mut,