diff --git a/solana/bridge/program/src/api/post_vaa.rs b/solana/bridge/program/src/api/post_vaa.rs
index af43c5809..fac0e08da 100644
--- a/solana/bridge/program/src/api/post_vaa.rs
+++ b/solana/bridge/program/src/api/post_vaa.rs
@@ -22,6 +22,7 @@ use crate::{
         GuardianSetMismatch,
         PostVAAConsensusFailed,
         PostVAAGuardianSetExpired,
+        VAAInvalid,
     },
 };
 use byteorder::{
@@ -33,7 +34,10 @@ use serde::{
     Serialize,
 };
 use sha3::Digest;
-use solana_program::program_error::ProgramError;
+use solana_program::{
+    program_error::ProgramError,
+    pubkey::Pubkey,
+};
 use solitaire::{
     processors::seeded::Seeded,
     CreationLamports::Exempt,
@@ -174,6 +178,26 @@ fn check_active<'r>(
     Ok(())
 }
 
+// Static list of invalid signature accounts that are not allowed to post VAAs.
+static INVALID_SIGNATURES: &'static [&'static str; 16] = &[
+    "18eK1799CaNMGCUnnCt1Kq2uwKkax6T2WmtrDsZuVFQ",
+    "2g6NCUUPaD6AxdHPQMVLpjpAvBfKMek6dDiGUe2A6T33",
+    "3hYV5968hNzbqUfcvnQ6v9D5h32hEwGJn19c47N3unNj",
+    "76eEyhaEKs4mesjiQiu8bghvwDHNxJW3EfcpbNC78y1z",
+    "7PdcxSn7xk2UN5VYmKnJ2Q64PdBhbBQFf4RwHqhQCMgv",
+    "94wXN3z3Pph2vMVaviZSouo7oCDqt4fekvqT3FYJSrWA",
+    "AXe9VXd9jjXkBxSdvgj4bHSZNeqxY73sSQEsp1tnekY4",
+    "B2hS49B8n4Ad6cxZLoAjz7Hux7Kf17D5xUX3neDPHpug",
+    "BTXnYYjnfXByqJprarqzp65Yha2XwQVmg8V8KWBhr6aA",
+    "Bzb5G4Y8QcaMVMQq3r8q1SuKSxtgnWSFdKCEisJCbcBP",
+    "CJfRUQxyonG6B5mnztsNUqxknbFT89DJdrdrzV9F96mU",
+    "CK1j9TxWP1T5w1QzFu4vPDAbUR34mfVqvk5wziE8TzST",
+    "E8qKJMwzBCiHCHUmBEcL631kN5CjfsHNx24osFLfHg69",
+    "EtMw1nQ4AQaH53RjYz3pRk12rrqWjcYjPDETphYJzmCX",
+    "EVNwqfgkUnJoMqBqiHgDfa3TLZPQocX1hpcbAXbpcSLv",
+    "FixSiDfTxvoy5Zgjp5KdFU8U23ChwCxPWY3WTkmMW2fU",
+];
+
 /// The signatures in this instruction must be from the right guardian set.
 #[inline(always)]
 fn check_valid_sigs<'r>(
@@ -183,6 +207,12 @@ fn check_valid_sigs<'r>(
     if signatures.guardian_set_index != guardian_set.index {
         return Err(GuardianSetMismatch.into());
     }
+
+    // Reject blacklisted signature accounts.
+    if INVALID_SIGNATURES.contains(&&*signatures.info().key.to_string()) {
+        return Err(VAAInvalid.into());
+    }
+
     Ok(())
 }
 
diff --git a/solana/bridge/program/src/error.rs b/solana/bridge/program/src/error.rs
index 7e17bde5c..dc28a4884 100644
--- a/solana/bridge/program/src/error.rs
+++ b/solana/bridge/program/src/error.rs
@@ -23,6 +23,7 @@ pub enum Error {
     PostVAAGuardianSetExpired,
     TooManyGuardians,
     VAAAlreadyExecuted,
+    VAAInvalid,
 }
 
 /// Errors thrown by the program will bubble up to the solitaire wrapper, which needs a way to
diff --git a/solana/bridge/program/src/vaa.rs b/solana/bridge/program/src/vaa.rs
index 0f323a46a..69f512f6e 100644
--- a/solana/bridge/program/src/vaa.rs
+++ b/solana/bridge/program/src/vaa.rs
@@ -8,6 +8,7 @@ use crate::{
         InvalidGovernanceChain,
         InvalidGovernanceModule,
         VAAAlreadyExecuted,
+        VAAInvalid,
     },
     Claim,
     ClaimDerivationData,
@@ -23,7 +24,10 @@ use serde::{
     Deserialize,
     Serialize,
 };
-use solana_program::pubkey::Pubkey;
+use solana_program::{
+    account_info::AccountInfo,
+    pubkey::Pubkey,
+};
 use solitaire::{
     processors::seeded::Seeded,
     trace,
@@ -143,6 +147,10 @@ impl<'b, T: DeserializePayload> PayloadMessage<'b, T> {
     pub fn meta(&self) -> &PostedVAAData {
         &self.0
     }
+
+    pub fn info(&self) -> AccountInfo<'b> {
+        self.0.info().clone()
+    }
 }
 
 #[derive(FromAccounts)]
diff --git a/solana/modules/token_bridge/program/src/api/complete_transfer.rs b/solana/modules/token_bridge/program/src/api/complete_transfer.rs
index d115bca74..4fbcf567a 100644
--- a/solana/modules/token_bridge/program/src/api/complete_transfer.rs
+++ b/solana/modules/token_bridge/program/src/api/complete_transfer.rs
@@ -15,6 +15,7 @@ use crate::{
     messages::PayloadTransfer,
     types::*,
     TokenBridgeError::*,
+    INVALID_VAAS,
 };
 use bridge::{
     vaa::ClaimableVAA,
@@ -124,6 +125,9 @@ pub fn complete_native(
     if accs.vaa.to != accs.to.info().key.to_bytes() {
         return Err(InvalidRecipient.into());
     }
+    if INVALID_VAAS.contains(&&*accs.vaa.message.info().key.to_string()) {
+        return Err(InvalidVAA.into());
+    }
 
     // Prevent vaa double signing
     accs.vaa.verify(ctx.program_id)?;
@@ -243,6 +247,9 @@ pub fn complete_wrapped(
     if accs.vaa.to != accs.to.info().key.to_bytes() {
         return Err(InvalidRecipient.into());
     }
+    if INVALID_VAAS.contains(&&*accs.vaa.message.info().key.to_string()) {
+        return Err(InvalidVAA.into());
+    }
 
     accs.vaa.verify(ctx.program_id)?;
     accs.vaa.claim(ctx, accs.payer.key)?;
diff --git a/solana/modules/token_bridge/program/src/api/create_wrapped.rs b/solana/modules/token_bridge/program/src/api/create_wrapped.rs
index e988d819b..95f042eef 100644
--- a/solana/modules/token_bridge/program/src/api/create_wrapped.rs
+++ b/solana/modules/token_bridge/program/src/api/create_wrapped.rs
@@ -16,7 +16,9 @@ use crate::{
     TokenBridgeError::{
         InvalidChain,
         InvalidMetadata,
+        InvalidVAA,
     },
+    INVALID_VAAS,
 };
 use bridge::{
     vaa::ClaimableVAA,
@@ -127,6 +129,10 @@ pub fn create_wrapped(
     accs.chain_registration
         .verify_derivation(ctx.program_id, &derivation_data)?;
 
+    if INVALID_VAAS.contains(&&*accs.vaa.message.info().key.to_string()) {
+        return Err(InvalidVAA.into());
+    }
+
     accs.vaa.verify(ctx.program_id)?;
     accs.vaa.claim(ctx, accs.payer.key)?;
 
diff --git a/solana/modules/token_bridge/program/src/api/governance.rs b/solana/modules/token_bridge/program/src/api/governance.rs
index caad0254b..c243220b7 100644
--- a/solana/modules/token_bridge/program/src/api/governance.rs
+++ b/solana/modules/token_bridge/program/src/api/governance.rs
@@ -12,7 +12,9 @@ use crate::{
     TokenBridgeError::{
         InvalidChain,
         InvalidGovernanceKey,
+        InvalidVAA,
     },
+    INVALID_VAAS,
 };
 use bridge::{
     vaa::{
@@ -101,9 +103,12 @@ pub fn upgrade_contract(
     accs: &mut UpgradeContract,
     _data: UpgradeContractData,
 ) -> Result<()> {
+    if INVALID_VAAS.contains(&&*accs.vaa.message.info().key.to_string()) {
+        return Err(InvalidVAA.into());
+    }
+
     verify_governance(&accs.vaa)?;
     accs.vaa.verify(ctx.program_id)?;
-
     accs.vaa.claim(ctx, accs.payer.key)?;
 
     let upgrade_ix = solana_program::bpf_loader_upgradeable::upgrade(
@@ -151,12 +156,16 @@ pub struct RegisterChainData {}
 pub fn register_chain(
     ctx: &ExecutionContext,
     accs: &mut RegisterChain,
-    data: RegisterChainData,
+    _data: RegisterChainData,
 ) -> Result<()> {
     let derivation_data: EndpointDerivationData = (&*accs).into();
     accs.endpoint
         .verify_derivation(ctx.program_id, &derivation_data)?;
 
+    if INVALID_VAAS.contains(&&*accs.vaa.message.info().key.to_string()) {
+        return Err(InvalidVAA.into());
+    }
+
     // Claim VAA
     verify_governance(&accs.vaa)?;
     accs.vaa.verify(ctx.program_id)?;
diff --git a/solana/modules/token_bridge/program/src/lib.rs b/solana/modules/token_bridge/program/src/lib.rs
index 1062ae1bf..6721c4ca3 100644
--- a/solana/modules/token_bridge/program/src/lib.rs
+++ b/solana/modules/token_bridge/program/src/lib.rs
@@ -53,6 +53,17 @@ pub use api::{
 use solitaire::*;
 use std::error::Error;
 
+// Static list of invalid VAA Message accounts.
+pub(crate) static INVALID_VAAS: &'static [&'static str; 7] = &[
+    "28Tx7c3W8rggVNyUQEAL9Uq6pUng4xJLAeLA6V8nLH1Z",
+    "32YEuzLCvSyHoV6NFpaTXfiAB8sHiAnYcvP2BBeLeGWq",
+    "427N2RrDHYooLvyWCiEiNR4KtGsGFTMuXiGwtuChWRSd",
+    "56Vf4Y2SCxJBf4TSR24fPF8qLHhC8ZuTJvHS6mLGWieD",
+    "7SzK4pmh9fM9SWLTCKmbjQC8EvDgPmtwdaBeTRztkM98",
+    "G2VJNjmQsz6wfVZkTUzYAB8ZzRS2hZbpUd5Cr4DTpz6t",
+    "GvAarWUV8khMLrTRouzBh3xSr8AeLDXxoKNJ6FgxGyg5",
+];
+
 pub enum TokenBridgeError {
     AlreadyExecuted,
     InvalidChain,
@@ -66,6 +77,7 @@ pub enum TokenBridgeError {
     WrongAccountOwner,
     InvalidFee,
     InvalidRecipient,
+    InvalidVAA,
 }
 
 impl From<TokenBridgeError> for SolitaireError {