diff --git a/solana/anchor-bridge/programs/anchor-bridge/src/api.rs b/solana/anchor-bridge/programs/anchor-bridge/src/api.rs
index de5b4a5a..aea881d0 100644
--- a/solana/anchor-bridge/programs/anchor-bridge/src/api.rs
+++ b/solana/anchor-bridge/programs/anchor-bridge/src/api.rs
@@ -1,4 +1,6 @@
+pub mod initialize;
 pub mod verify_signatures;
 
 // Re-expose underlying module functions and data, for consuming APIs to use.
+pub use initialize::*;
 pub use verify_signatures::*;
diff --git a/solana/anchor-bridge/programs/anchor-bridge/src/api/initialize.rs b/solana/anchor-bridge/programs/anchor-bridge/src/api/initialize.rs
new file mode 100644
index 00000000..2a0fec07
--- /dev/null
+++ b/solana/anchor-bridge/programs/anchor-bridge/src/api/initialize.rs
@@ -0,0 +1,6 @@
+use crate::{accounts, Initialize, InitializeData};
+use anchor_lang::{prelude::*, solana_program};
+
+pub fn initialize(ctx: Context<Initialize>, data: InitializeData) -> ProgramResult {
+    Ok(())
+}
diff --git a/solana/anchor-bridge/programs/anchor-bridge/src/lib.rs b/solana/anchor-bridge/programs/anchor-bridge/src/lib.rs
index 41b23ba7..032de37b 100644
--- a/solana/anchor-bridge/programs/anchor-bridge/src/lib.rs
+++ b/solana/anchor-bridge/programs/anchor-bridge/src/lib.rs
@@ -2,9 +2,10 @@ use anchor_lang::{prelude::*, solana_program};
 
 mod account;
 mod api;
+mod types;
 
-use account::BridgeInfo;
-use account::GuardianSetInfo;
+use account::{BridgeInfo, GuardianSetInfo};
+use types::BridgeConfig;
 
 /// An enum with labeled network identifiers. These must be consistent accross all wormhole
 /// contracts deployed on each chain.
@@ -18,16 +19,6 @@ pub const CHAIN_ID_SOLANA: u8 = Chain::Solana as u8;
 /// maximum number of guardians
 pub const MAX_LEN_GUARDIAN_KEYS: usize = 20;
 
-#[derive(AnchorSerialize, AnchorDeserialize, Clone, Copy, Debug)]
-pub struct VerifySigsData {
-    /// hash of the VAA
-    pub hash: [u8; 32],
-    /// instruction indices of signers (-1 for missing)
-    pub signers: [i8; MAX_LEN_GUARDIAN_KEYS],
-    /// indicates whether this verification should only succeed if the sig account does not exist
-    pub initial_creation: bool,
-}
-
 #[derive(Accounts)]
 pub struct VerifySig<'info> {
     pub bridge: AccountInfo<'info>,
@@ -39,10 +30,37 @@ pub struct VerifySig<'info> {
     pub payer_info: AccountInfo<'info>,
 }
 
+#[derive(AnchorSerialize, AnchorDeserialize, Clone, Copy, Debug)]
+pub struct VerifySigsData {
+    /// hash of the VAA
+    pub hash: [u8; 32],
+    /// instruction indices of signers (-1 for missing)
+    pub signers: [i8; MAX_LEN_GUARDIAN_KEYS],
+    /// indicates whether this verification should only succeed if the sig account does not exist
+    pub initial_creation: bool,
+}
+
+#[derive(Accounts)]
+pub struct Initialize {}
+
+#[derive(AnchorSerialize, AnchorDeserialize, Clone, Copy, Debug)]
+pub struct InitializeData {
+    /// number of initial guardians
+    pub len_guardians: u8,
+    /// guardians that are allowed to sign mints
+    pub initial_guardian: [[u8; 20]; MAX_LEN_GUARDIAN_KEYS],
+    /// config for the bridge
+    pub config: BridgeConfig,
+}
+
 #[program]
 pub mod anchor_bridge {
     use super::*;
 
+    pub fn initialize(ctx: Context<Initialize>, data: InitializeData) -> ProgramResult {
+        api::initialize(ctx, data)
+    }
+
     pub fn verify_signatures(ctx: Context<VerifySig>, data: VerifySigsData) -> ProgramResult {
         api::verify_signatures(ctx, data)
     }
diff --git a/solana/anchor-bridge/programs/anchor-bridge/src/types.rs b/solana/anchor-bridge/programs/anchor-bridge/src/types.rs
new file mode 100644
index 00000000..15bfc711
--- /dev/null
+++ b/solana/anchor-bridge/programs/anchor-bridge/src/types.rs
@@ -0,0 +1,11 @@
+use anchor_lang::prelude::*;
+
+#[repr(C)]
+#[derive(AnchorSerialize, AnchorDeserialize, Clone, Copy, Debug)]
+pub struct BridgeConfig {
+    /// Period for how long a guardian set is valid after it has been replaced by a new one.  This
+    /// guarantees that VAAs issued by that set can still be submitted for a certain period.  In
+    /// this period we still trust the old guardian set.
+    pub guardian_set_expiration_time: u32,
+}
+