diff --git a/README.md b/README.md
index cc46223..57603e7 100644
--- a/README.md
+++ b/README.md
@@ -125,3 +125,30 @@ Ethereum style). `authority` is the one who can update
 the TSS address stored in PDA account. 
 
 The `initialize` instruction sets nonce to 0. 
+
+# Troubleshooting
+
+## MacOS error when runngin `anchor test` or `solana-test-validator`
+
+If you see errors like
+```
+Unable to get latest blockhash. Test validator does not look started. Check ".anchor/test-ledger/test-ledger-log.txt" for errors. Consider increasing [test.startup_wait] in Anchor.toml.
+```
+
+or 
+```bash
+% solana-test-validator --reset
+Ledger location: test-ledger
+Log: test-ledger/validator.log
+Error: failed to start validator: Failed to create ledger at test-ledger: io error: Error checking to unpack genesis archive: Archive error: extra entry found: "._genesis.bin" Regular
+```
+
+This is because the BSD tar program is not compatible with the GNU tar program.
+To fix it: 
+
+```bash
+brew install gnu-tar
+# Put this in ~/.zshrc 
+export PATH="/opt/homebrew/opt/gnu-tar/libexec/gnubin:$PATH"
+```
+see https://solana.stackexchange.com/questions/4499/blockstore-error-when-starting-solana-test-validator-on-macos-13-0-1
\ No newline at end of file
diff --git a/programs/protocol-contracts-solana/src/lib.rs b/programs/protocol-contracts-solana/src/lib.rs
index 58f05a9..ad19814 100644
--- a/programs/protocol-contracts-solana/src/lib.rs
+++ b/programs/protocol-contracts-solana/src/lib.rs
@@ -24,6 +24,8 @@ pub enum Errors {
     MemoLengthExceeded,
     #[msg("MemoLengthTooShort")]
     MemoLengthTooShort,
+    #[msg("DepositPaused")]
+    DepositPaused,
 }
 
 declare_id!("94U5AHQMKkV5txNJ17QPXWoh474PheGou6cNP2FEuL1d");
@@ -42,10 +44,22 @@ pub mod gateway {
         initialized_pda.tss_address = tss_address;
         initialized_pda.authority = ctx.accounts.signer.key();
         initialized_pda.chain_id = chain_id;
+        initialized_pda.deposit_paused = false;
 
         Ok(())
     }
 
+    pub fn set_deposit_paused(ctx: Context<UpdatePaused>, deposit_paused: bool) -> Result<()> {
+        let pda = &mut ctx.accounts.pda;
+        require!(
+            ctx.accounts.signer.key() == pda.authority,
+            Errors::SignerIsNotAuthority
+        );
+        pda.deposit_paused = deposit_paused;
+        msg!("set_deposit_paused: {:?}", deposit_paused);
+        Ok(())
+    }
+
     pub fn update_tss(ctx: Context<UpdateTss>, tss_address: [u8; 20]) -> Result<()> {
         let pda = &mut ctx.accounts.pda;
         require!(
@@ -59,6 +73,10 @@ pub mod gateway {
     pub fn deposit(ctx: Context<Deposit>, amount: u64, memo: Vec<u8>) -> Result<()> {
         require!(memo.len() >= 20, Errors::MemoLengthTooShort);
         require!(memo.len() <= 512, Errors::MemoLengthExceeded);
+
+        let pda = &mut ctx.accounts.pda;
+        require!(!pda.deposit_paused, Errors::DepositPaused);
+
         let cpi_context = CpiContext::new(
             ctx.accounts.system_program.to_account_info(),
             system_program::Transfer {
@@ -86,6 +104,9 @@ pub mod gateway {
         let token = &ctx.accounts.token_program;
         let from = &ctx.accounts.from;
 
+        let pda = &mut ctx.accounts.pda;
+        require!(!pda.deposit_paused, Errors::DepositPaused);
+
         let pda_ata = spl_associated_token_account::get_associated_token_address(
             &ctx.accounts.pda.key(),
             &from.mint,
@@ -293,12 +314,22 @@ pub struct UpdateTss<'info> {
     pub signer: Signer<'info>,
 }
 
+#[derive(Accounts)]
+pub struct UpdatePaused<'info> {
+    #[account(mut)]
+    pub pda: Account<'info, Pda>,
+    #[account(mut)]
+    pub signer: Signer<'info>,
+}
+
+
 #[account]
 pub struct Pda {
     nonce: u64,            // ensure that each signature can only be used once
     tss_address: [u8; 20], // 20 bytes address format of ethereum
     authority: Pubkey,
     chain_id: u64,
+    deposit_paused: bool,
 }
 
 #[cfg(test)]
diff --git a/tests/protocol-contracts-solana.ts b/tests/protocol-contracts-solana.ts
index 9e3dfde..5e07237 100644
--- a/tests/protocol-contracts-solana.ts
+++ b/tests/protocol-contracts-solana.ts
@@ -300,6 +300,25 @@ describe("some tests", () => {
         }
     });
 
+    it("pause deposit and deposit should fail", async () => {
+        const newTss = new Uint8Array(20);
+        randomFillSync(newTss);
+        // console.log("generated new TSS address", newTss);
+        await gatewayProgram.methods.setDepositPaused(true).accounts({
+            pda: pdaAccount,
+        }).rpc();
+
+        // now try deposit, should fail
+        try {
+            await gatewayProgram.methods.deposit(new anchor.BN(1_000_000), address).accounts({pda: pdaAccount}).rpc();
+        } catch (err) {
+            console.log("Error message: ", err.message);
+            expect(err).to.be.instanceof(anchor.AnchorError);
+            expect(err.message).to.include("DepositPaused");
+        }
+
+    });
+
 
 });