diff --git a/crates/contracts/core/src/master_account/src/Cargo.toml b/crates/contracts/core/src/master_account/src/Cargo.toml
new file mode 100644
index 0000000..e69de29
diff --git a/crates/contracts/core/src/master_account/src/errors.rs b/crates/contracts/core/src/master_account/src/errors.rs
new file mode 100644
index 0000000..6def752
--- /dev/null
+++ b/crates/contracts/core/src/master_account/src/errors.rs
@@ -0,0 +1,10 @@
+use soroban_sdk::contracterror;
+
+#[contracterror]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum ContractError {
+    NotAuthorized = 1,
+    InvalidThreshold = 2,
+    SignerNotFound = 3,
+}
\ No newline at end of file
diff --git a/crates/contracts/core/src/master_account/src/events.rs b/crates/contracts/core/src/master_account/src/events.rs
new file mode 100644
index 0000000..9ef6ed2
--- /dev/null
+++ b/crates/contracts/core/src/master_account/src/events.rs
@@ -0,0 +1,15 @@
+use soroban_sdk::{Address, Env, symbol_short};
+
+pub fn admin_rotated(env: &Env, new_admin: Address) {
+    env.events().publish(
+        (symbol_short!("admin_rotated"),),
+        new_admin,
+    );
+}
+
+pub fn signer_added(env: &Env, signer: Address) {
+    env.events().publish(
+        (symbol_short!("signer_added"),),
+        signer,
+    );
+}
\ No newline at end of file
diff --git a/crates/contracts/core/src/master_account/src/lib.rs b/crates/contracts/core/src/master_account/src/lib.rs
new file mode 100644
index 0000000..f9689b5
--- /dev/null
+++ b/crates/contracts/core/src/master_account/src/lib.rs
@@ -0,0 +1,85 @@
+#![no_std]
+
+use soroban_sdk::{
+    contract, contractimpl, Address, Env, Vec
+};
+
+mod storage;
+mod errors;
+mod events;
+
+use storage::DataKey;
+use errors::ContractError;
+
+#[contract]
+pub struct MasterAccountContract;
+
+#[contractimpl]
+impl MasterAccountContract {
+
+    // Initialize contract
+    pub fn initialize(
+        env: Env,
+        admin: Address,
+        threshold: u32,
+    ) {
+        if env.storage().has(&DataKey::Admin) {
+            panic!("Already initialized");
+        }
+
+        admin.require_auth();
+
+        env.storage().set(&DataKey::Admin, &admin);
+        env.storage().set(&DataKey::Signers, &Vec::<Address>::new(&env));
+        env.storage().set(&DataKey::Threshold, &threshold);
+    }
+
+    // Rotate admin
+    pub fn rotate_admin(env: Env, new_admin: Address) {
+        let admin: Address = env.storage().get(&DataKey::Admin).unwrap();
+        admin.require_auth();
+
+        env.storage().set(&DataKey::Admin, &new_admin);
+        events::admin_rotated(&env, new_admin);
+    }
+
+    // Add signer (for multisig)
+    pub fn add_signer(env: Env, signer: Address) {
+        let admin: Address = env.storage().get(&DataKey::Admin).unwrap();
+        admin.require_auth();
+
+        let mut signers: Vec<Address> =
+            env.storage().get(&DataKey::Signers).unwrap();
+
+        signers.push_back(signer.clone());
+
+        env.storage().set(&DataKey::Signers, &signers);
+
+        events::signer_added(&env, signer);
+    }
+
+    // Update threshold
+    pub fn set_threshold(env: Env, threshold: u32) {
+        let admin: Address = env.storage().get(&DataKey::Admin).unwrap();
+        admin.require_auth();
+
+        if threshold == 0 {
+            panic_with_error!(&env, ContractError::InvalidThreshold);
+        }
+
+        env.storage().set(&DataKey::Threshold, &threshold);
+    }
+
+    // Getters
+    pub fn get_admin(env: Env) -> Address {
+        env.storage().get(&DataKey::Admin).unwrap()
+    }
+
+    pub fn get_threshold(env: Env) -> u32 {
+        env.storage().get(&DataKey::Threshold).unwrap()
+    }
+
+    pub fn get_signers(env: Env) -> Vec<Address> {
+        env.storage().get(&DataKey::Signers).unwrap()
+    }
+}
\ No newline at end of file
diff --git a/crates/contracts/core/src/master_account/src/storage.rs b/crates/contracts/core/src/master_account/src/storage.rs
new file mode 100644
index 0000000..00af868
--- /dev/null
+++ b/crates/contracts/core/src/master_account/src/storage.rs
@@ -0,0 +1,8 @@
+use soroban_sdk::{contracttype, Address};
+
+#[contracttype]
+pub enum DataKey {
+    Admin,
+    Signers,
+    Threshold,
+}
\ No newline at end of file
diff --git a/crates/contracts/tests/master_account_tests.rs b/crates/contracts/tests/master_account_tests.rs
new file mode 100644
index 0000000..bf21c48
--- /dev/null
+++ b/crates/contracts/tests/master_account_tests.rs
@@ -0,0 +1,19 @@
+use soroban_sdk::{
+    testutils::{Address as _},
+    Address, Env
+};
+
+use master_account::MasterAccountContract;
+
+#[test]
+fn test_initialize() {
+    let env = Env::default();
+    let admin = Address::generate(&env);
+
+    let contract_id = env.register_contract(None, MasterAccountContract);
+    let client = MasterAccountContractClient::new(&env, &contract_id);
+
+    client.initialize(&admin, &1);
+
+    assert_eq!(client.get_admin(), admin);
+}
\ No newline at end of file