diff --git a/pallets/admin-utils/src/tests/mock.rs b/pallets/admin-utils/src/tests/mock.rs
index fc0d016198..43a40ec32e 100644
--- a/pallets/admin-utils/src/tests/mock.rs
+++ b/pallets/admin-utils/src/tests/mock.rs
@@ -135,6 +135,7 @@ parameter_types! {
     pub const InitialDissolveNetworkScheduleDuration: u64 = 5 * 24 * 60 * 60 / 12; // 5 days
     pub const InitialTaoWeight: u64 = u64::MAX/10; // 10% global weight.
     pub const InitialEmaPriceHalvingPeriod: u64 = 201_600_u64; // 4 weeks
+    pub const DurationOfStartCall: u64 = 7 * 24 * 60 * 60 / 12; // 7 days
 }
 
 impl pallet_subtensor::Config for Test {
@@ -199,6 +200,7 @@ impl pallet_subtensor::Config for Test {
     type InitialDissolveNetworkScheduleDuration = InitialDissolveNetworkScheduleDuration;
     type InitialTaoWeight = InitialTaoWeight;
     type InitialEmaPriceHalvingPeriod = InitialEmaPriceHalvingPeriod;
+    type DurationOfStartCall = DurationOfStartCall;
 }
 
 #[derive_impl(frame_system::config_preludes::TestDefaultConfig)]
diff --git a/pallets/subtensor/src/benchmarks.rs b/pallets/subtensor/src/benchmarks.rs
index 47dd7a5bc5..8d4457b0c9 100644
--- a/pallets/subtensor/src/benchmarks.rs
+++ b/pallets/subtensor/src/benchmarks.rs
@@ -6,7 +6,7 @@ use crate::Pallet as Subtensor;
 use crate::*;
 use frame_benchmarking::{account, benchmarks, whitelisted_caller};
 use frame_support::assert_ok;
-use frame_system::RawOrigin;
+use frame_system::{RawOrigin, pallet_prelude::BlockNumberFor};
 pub use pallet::*;
 use sp_core::H256;
 use sp_runtime::traits::{BlakeTwo256, Hash};
@@ -658,4 +658,35 @@ benchmark_burn_alpha {
 
 }: burn_alpha(RawOrigin::Signed(coldkey), hotkey, alpha_amount, netuid)
 
+
+benchmark_start_call {
+  let caller: T::AccountId = whitelisted_caller::<AccountIdOf<T>>();
+  let caller_origin = <T as frame_system::Config>::RuntimeOrigin::from(RawOrigin::Signed(caller.clone()));
+  let netuid: u16 = 1;
+  let tempo: u16 = 1;
+  let seed: u32 = 1;
+
+  // Set up coldkey and hotkey
+  let coldkey: T::AccountId = account("Test", 0, seed);
+  let hotkey: T::AccountId = account("Alice", 0, seed);
+
+  // Initialize network
+  Subtensor::<T>::init_new_network(netuid, tempo);
+  Subtensor::<T>::set_network_registration_allowed(netuid, true);
+
+  // Register the neuron
+  Subtensor::<T>::set_burn(netuid, 1);
+  let amount_to_be_staked = 1000000u32.into();
+  Subtensor::<T>::add_balance_to_coldkey_account(&coldkey.clone(), amount_to_be_staked);
+
+  assert_ok!(Subtensor::<T>::do_burned_registration(RawOrigin::Signed(coldkey.clone()).into(), netuid, hotkey.clone()));
+  assert_eq!(SubnetOwner::<T>::get(netuid), coldkey.clone());
+  assert_eq!(FirstEmissionBlockNumber::<T>::get(netuid), None);
+  let current_block: u64 = Subtensor::<T>::get_current_block_as_u64();
+  let duration = <T as Config>::DurationOfStartCall::get();
+  let block: BlockNumberFor<T> = (current_block + duration).try_into().ok().expect("can't convert to block number");
+  frame_system::Pallet::<T>::set_block_number(block);
+
+}: start_call(RawOrigin::Signed(coldkey), netuid)
+
 }
diff --git a/pallets/subtensor/src/coinbase/run_coinbase.rs b/pallets/subtensor/src/coinbase/run_coinbase.rs
index 7836423868..7a29d4959a 100644
--- a/pallets/subtensor/src/coinbase/run_coinbase.rs
+++ b/pallets/subtensor/src/coinbase/run_coinbase.rs
@@ -37,10 +37,11 @@ impl<T: Config> Pallet<T> {
         let current_block: u64 = Self::get_current_block_as_u64();
         log::debug!("Current block: {:?}", current_block);
 
-        // --- 1. Get all netuids (filter out root.)
+        // --- 1. Get all netuids (filter out root and new subnet without first emission block)
         let subnets: Vec<u16> = Self::get_all_subnet_netuids()
             .into_iter()
             .filter(|netuid| *netuid != 0)
+            .filter(|netuid| FirstEmissionBlockNumber::<T>::get(*netuid).is_some())
             .collect();
         log::debug!("All subnet netuids: {:?}", subnets);
 
diff --git a/pallets/subtensor/src/lib.rs b/pallets/subtensor/src/lib.rs
index 03438aa637..1ec9cadb0a 100644
--- a/pallets/subtensor/src/lib.rs
+++ b/pallets/subtensor/src/lib.rs
@@ -1125,7 +1125,11 @@ pub mod pallet {
     /// ============================
     /// ==== Subnet Parameters =====
     /// ============================
-    #[pallet::storage] // --- MAP ( netuid ) --> subnet mechanism
+    /// --- MAP ( netuid ) --> block number of first emission
+    #[pallet::storage]
+    pub type FirstEmissionBlockNumber<T: Config> = StorageMap<_, Identity, u16, u64, OptionQuery>;
+    /// --- MAP ( netuid ) --> subnet mechanism
+    #[pallet::storage]
     pub type SubnetMechanism<T: Config> =
         StorageMap<_, Identity, u16, u16, ValueQuery, DefaultZeroU16<T>>;
     #[pallet::storage]
diff --git a/pallets/subtensor/src/macros/config.rs b/pallets/subtensor/src/macros/config.rs
index af448c8771..cf4d97b65b 100644
--- a/pallets/subtensor/src/macros/config.rs
+++ b/pallets/subtensor/src/macros/config.rs
@@ -210,5 +210,8 @@ mod config {
         /// Initial EMA price halving period
         #[pallet::constant]
         type InitialEmaPriceHalvingPeriod: Get<u64>;
+        /// Block number after a new subnet accept the start call extrinsic.
+        #[pallet::constant]
+        type DurationOfStartCall: Get<u64>;
     }
 }
diff --git a/pallets/subtensor/src/macros/dispatches.rs b/pallets/subtensor/src/macros/dispatches.rs
index 9f61aca60c..9158073e17 100644
--- a/pallets/subtensor/src/macros/dispatches.rs
+++ b/pallets/subtensor/src/macros/dispatches.rs
@@ -1910,6 +1910,25 @@ mod dispatches {
             Ok(())
         }
 
+        /// Initiates a call on a subnet.
+        ///
+        /// # Arguments
+        /// * `origin` - The origin of the call, which must be signed by the subnet owner.
+        /// * `netuid` - The unique identifier of the subnet on which the call is being initiated.
+        ///
+        /// # Events
+        /// Emits a `FirstEmissionBlockNumberSet` event on success.
+        #[pallet::call_index(92)]
+        #[pallet::weight((
+            Weight::from_parts(3_000_000, 0).saturating_add(T::DbWeight::get().reads_writes(6, 1)),
+            DispatchClass::Operational,
+            Pays::Yes
+        ))]
+        pub fn start_call(origin: T::RuntimeOrigin, netuid: u16) -> DispatchResult {
+            Self::do_start_call(origin, netuid)?;
+            Ok(())
+        }
+
         /// Recycles alpha from a cold/hot key pair, reducing AlphaOut on a subnet
         ///
         /// # Arguments
diff --git a/pallets/subtensor/src/macros/errors.rs b/pallets/subtensor/src/macros/errors.rs
index 609f87b641..ef965bf169 100644
--- a/pallets/subtensor/src/macros/errors.rs
+++ b/pallets/subtensor/src/macros/errors.rs
@@ -195,6 +195,10 @@ mod errors {
         ActivityCutoffTooLow,
         /// Call is disabled
         CallDisabled,
+        /// FirstEmissionBlockNumber is already set.
+        FirstEmissionBlockNumberAlreadySet,
+        /// need wait for more blocks to accept the start call extrinsic.
+        NeedWaitingMoreBlocksToStarCall,
         /// Not enough AlphaOut on the subnet to recycle
         NotEnoughAlphaOutToRecycle,
     }
diff --git a/pallets/subtensor/src/macros/events.rs b/pallets/subtensor/src/macros/events.rs
index 1c87d37ed1..04a2093abf 100644
--- a/pallets/subtensor/src/macros/events.rs
+++ b/pallets/subtensor/src/macros/events.rs
@@ -275,6 +275,12 @@ mod events {
         /// Parameters:
         /// (netuid, new_hotkey)
         SubnetOwnerHotkeySet(u16, T::AccountId),
+        /// FirstEmissionBlockNumber is set via start call extrinsic
+        ///
+        /// Parameters:
+        /// netuid
+        /// block number
+        FirstEmissionBlockNumberSet(u16, u64),
 
         /// Alpha has been recycled, reducing AlphaOut on a subnet.
         ///
diff --git a/pallets/subtensor/src/macros/hooks.rs b/pallets/subtensor/src/macros/hooks.rs
index df9dffabca..3203ae312c 100644
--- a/pallets/subtensor/src/macros/hooks.rs
+++ b/pallets/subtensor/src/macros/hooks.rs
@@ -81,7 +81,9 @@ mod hooks {
                 // Remove Stake map entries
 				.saturating_add(migrations::migrate_remove_stake_map::migrate_remove_stake_map::<T>())
                 // Remove unused maps entries
-				.saturating_add(migrations::migrate_remove_unused_maps_and_values::migrate_remove_unused_maps_and_values::<T>());
+				.saturating_add(migrations::migrate_remove_unused_maps_and_values::migrate_remove_unused_maps_and_values::<T>())
+                // Set last emission block number for all existed subnets before start call feature applied
+                .saturating_add(migrations::migrate_set_first_emission_block_number::migrate_set_first_emission_block_number::<T>());
             weight
         }
 
diff --git a/pallets/subtensor/src/migrations/migrate_set_first_emission_block_number.rs b/pallets/subtensor/src/migrations/migrate_set_first_emission_block_number.rs
new file mode 100644
index 0000000000..04ad306218
--- /dev/null
+++ b/pallets/subtensor/src/migrations/migrate_set_first_emission_block_number.rs
@@ -0,0 +1,53 @@
+use super::*;
+use crate::HasMigrationRun;
+use frame_support::{traits::Get, weights::Weight};
+use scale_info::prelude::string::String;
+
+pub fn migrate_set_first_emission_block_number<T: Config>() -> Weight {
+    let migration_name = b"migrate_set_first_emission_block_number".to_vec();
+
+    let mut weight = T::DbWeight::get().reads(1);
+    if HasMigrationRun::<T>::get(&migration_name) {
+        log::info!(
+            "Migration '{:?}' has already run. Skipping.",
+            String::from_utf8_lossy(&migration_name)
+        );
+        return weight;
+    }
+
+    log::info!(
+        "Running migration '{:?}'",
+        String::from_utf8_lossy(&migration_name)
+    );
+
+    // ------------------------------
+    // Step 1: Set the first emission block for all subnets except root
+    // ------------------------------
+    let netuids = Pallet::<T>::get_all_subnet_netuids();
+    let current_block_number = Pallet::<T>::get_current_block_as_u64();
+    for netuid in netuids.iter() {
+        if *netuid != 0 {
+            FirstEmissionBlockNumber::<T>::insert(netuid, current_block_number);
+        }
+    }
+
+    // ------------------------------
+    // Step 2: Mark Migration as Completed
+    // ------------------------------
+
+    HasMigrationRun::<T>::insert(&migration_name, true);
+    weight = weight.saturating_add(T::DbWeight::get().reads(2));
+
+    if netuids.is_empty() {
+        weight = weight.saturating_add(T::DbWeight::get().writes(1_u64));
+    } else {
+        weight = weight.saturating_add(T::DbWeight::get().writes(netuids.len() as u64));
+    }
+
+    log::info!(
+        "Migration '{:?}' completed successfully.",
+        String::from_utf8_lossy(&migration_name)
+    );
+
+    weight
+}
diff --git a/pallets/subtensor/src/migrations/mod.rs b/pallets/subtensor/src/migrations/mod.rs
index 6af6ad2a56..19e057e3ec 100644
--- a/pallets/subtensor/src/migrations/mod.rs
+++ b/pallets/subtensor/src/migrations/mod.rs
@@ -11,6 +11,7 @@ pub mod migrate_populate_owned_hotkeys;
 pub mod migrate_rao;
 pub mod migrate_remove_stake_map;
 pub mod migrate_remove_unused_maps_and_values;
+pub mod migrate_set_first_emission_block_number;
 pub mod migrate_set_min_burn;
 pub mod migrate_set_min_difficulty;
 pub mod migrate_stake_threshold;
diff --git a/pallets/subtensor/src/subnets/subnet.rs b/pallets/subtensor/src/subnets/subnet.rs
index bf1806da14..310c1d5fde 100644
--- a/pallets/subtensor/src/subnets/subnet.rs
+++ b/pallets/subtensor/src/subnets/subnet.rs
@@ -320,4 +320,58 @@ impl<T: Config> Pallet<T> {
             );
         }
     }
+
+    /// Execute the start call for a subnet.
+    ///
+    /// This function is used to trigger the start call process for a subnet identified by `netuid`.
+    /// It ensures that the subnet exists, the caller is the subnet owner,
+    /// and the last emission block number has not been set yet.
+    /// It then sets the last emission block number to the current block number.
+    ///
+    /// # Parameters
+    ///
+    /// * `origin`: The origin of the call, which is used to ensure the caller is the subnet owner.
+    /// * `netuid`: The unique identifier of the subnet for which the start call process is being initiated.
+    ///
+    /// # Raises
+    ///
+    /// * `Error::<T>::SubNetworkDoesNotExist`: If the subnet does not exist.
+    /// * `DispatchError::BadOrigin`: If the caller is not the subnet owner.
+    /// * `Error::<T>::FirstEmissionBlockNumberAlreadySet`: If the last emission block number has already been set.
+    ///
+    /// # Returns
+    ///
+    /// * `DispatchResult`: A result indicating the success or failure of the operation.
+    pub fn do_start_call(origin: T::RuntimeOrigin, netuid: u16) -> DispatchResult {
+        ensure!(
+            Self::if_subnet_exist(netuid),
+            Error::<T>::SubNetworkDoesNotExist
+        );
+        Self::ensure_subnet_owner(origin, netuid)?;
+        ensure!(
+            FirstEmissionBlockNumber::<T>::get(netuid).is_none(),
+            Error::<T>::FirstEmissionBlockNumberAlreadySet
+        );
+
+        let registration_block_number = NetworkRegisteredAt::<T>::get(netuid);
+        let current_block_number = Self::get_current_block_as_u64();
+
+        ensure!(
+            current_block_number
+                >= registration_block_number.saturating_add(T::DurationOfStartCall::get()),
+            Error::<T>::NeedWaitingMoreBlocksToStarCall
+        );
+        let next_block_number = current_block_number.saturating_add(1);
+
+        FirstEmissionBlockNumber::<T>::insert(netuid, next_block_number);
+        Self::deposit_event(Event::FirstEmissionBlockNumberSet(
+            netuid,
+            next_block_number,
+        ));
+        Ok(())
+    }
+
+    pub fn is_valid_subnet_for_emission(netuid: u16) -> bool {
+        FirstEmissionBlockNumber::<T>::get(netuid).is_some()
+    }
 }
diff --git a/pallets/subtensor/src/tests/migration.rs b/pallets/subtensor/src/tests/migration.rs
index c0cbe1b81a..2fac8c5db5 100644
--- a/pallets/subtensor/src/tests/migration.rs
+++ b/pallets/subtensor/src/tests/migration.rs
@@ -11,6 +11,7 @@ use frame_support::{
     traits::{StorageInstance, StoredMap},
     weights::Weight,
 };
+
 use frame_system::Config;
 use sp_core::{H256, U256, crypto::Ss58Codec};
 use sp_io::hashing::twox_128;
@@ -416,3 +417,24 @@ fn test_migrate_subnet_volume() {
         assert_eq!(new_value, Some(old_value as u128));
     });
 }
+
+#[test]
+fn test_migrate_set_first_emission_block_number() {
+    new_test_ext(1).execute_with(|| {
+    let netuids: [u16; 3] = [1, 2, 3];
+    let block_number = 100;
+    for netuid in netuids.iter() {
+        add_network(*netuid, 1, 0);
+    }
+    run_to_block(block_number);
+    let weight = crate::migrations::migrate_set_first_emission_block_number::migrate_set_first_emission_block_number::<Test>();
+
+    let expected_weight: Weight = <Test as Config>::DbWeight::get().reads(3) + <Test as Config>::DbWeight::get().writes(netuids.len() as u64);
+    assert_eq!(weight, expected_weight);
+
+    assert_eq!(FirstEmissionBlockNumber::<Test>::get(0), None);
+    for netuid in netuids.iter() {
+        assert_eq!(FirstEmissionBlockNumber::<Test>::get(netuid), Some(block_number));
+    }
+});
+}
diff --git a/pallets/subtensor/src/tests/mock.rs b/pallets/subtensor/src/tests/mock.rs
index 0d979a6126..ea5e3d4492 100644
--- a/pallets/subtensor/src/tests/mock.rs
+++ b/pallets/subtensor/src/tests/mock.rs
@@ -185,6 +185,7 @@ parameter_types! {
     pub const InitialDissolveNetworkScheduleDuration: u64 =  5 * 24 * 60 * 60 / 12; // Default as 5 days
     pub const InitialTaoWeight: u64 = 0; // 100% global weight.
     pub const InitialEmaPriceHalvingPeriod: u64 = 201_600_u64; // 4 weeks
+    pub const DurationOfStartCall: u64 =  7 * 24 * 60 * 60 / 12; // Default as 7 days
 }
 
 // Configure collective pallet for council
@@ -408,6 +409,7 @@ impl crate::Config for Test {
     type InitialDissolveNetworkScheduleDuration = InitialDissolveNetworkScheduleDuration;
     type InitialTaoWeight = InitialTaoWeight;
     type InitialEmaPriceHalvingPeriod = InitialEmaPriceHalvingPeriod;
+    type DurationOfStartCall = DurationOfStartCall;
 }
 
 pub struct OriginPrivilegeCmp;
@@ -662,6 +664,14 @@ pub fn add_network(netuid: u16, tempo: u16, _modality: u16) {
     SubtensorModule::init_new_network(netuid, tempo);
     SubtensorModule::set_network_registration_allowed(netuid, true);
     SubtensorModule::set_network_pow_registration_allowed(netuid, true);
+    FirstEmissionBlockNumber::<Test>::insert(netuid, 1);
+}
+
+#[allow(dead_code)]
+pub fn add_network_without_emission_block(netuid: u16, tempo: u16, _modality: u16) {
+    SubtensorModule::init_new_network(netuid, tempo);
+    SubtensorModule::set_network_registration_allowed(netuid, true);
+    SubtensorModule::set_network_pow_registration_allowed(netuid, true);
 }
 
 #[allow(dead_code)]
@@ -670,6 +680,22 @@ pub fn add_dynamic_network(hotkey: &U256, coldkey: &U256) -> u16 {
     let lock_cost = SubtensorModule::get_network_lock_cost();
     SubtensorModule::add_balance_to_coldkey_account(coldkey, lock_cost);
 
+    assert_ok!(SubtensorModule::register_network(
+        RawOrigin::Signed(*coldkey).into(),
+        *hotkey
+    ));
+    NetworkRegistrationAllowed::<Test>::insert(netuid, true);
+    NetworkPowRegistrationAllowed::<Test>::insert(netuid, true);
+    FirstEmissionBlockNumber::<Test>::insert(netuid, 0);
+    netuid
+}
+
+#[allow(dead_code)]
+pub fn add_dynamic_network_without_emission_block(hotkey: &U256, coldkey: &U256) -> u16 {
+    let netuid = SubtensorModule::get_next_netuid();
+    let lock_cost = SubtensorModule::get_network_lock_cost();
+    SubtensorModule::add_balance_to_coldkey_account(coldkey, lock_cost);
+
     assert_ok!(SubtensorModule::register_network(
         RawOrigin::Signed(*coldkey).into(),
         *hotkey
diff --git a/pallets/subtensor/src/tests/mod.rs b/pallets/subtensor/src/tests/mod.rs
index 8a9fa6b103..efd45ddef1 100644
--- a/pallets/subtensor/src/tests/mod.rs
+++ b/pallets/subtensor/src/tests/mod.rs
@@ -17,6 +17,7 @@ mod senate;
 mod serving;
 mod staking;
 mod staking2;
+mod subnet;
 mod swap_coldkey;
 mod swap_hotkey;
 mod uids;
diff --git a/pallets/subtensor/src/tests/subnet.rs b/pallets/subtensor/src/tests/subnet.rs
new file mode 100644
index 0000000000..1daf19159f
--- /dev/null
+++ b/pallets/subtensor/src/tests/subnet.rs
@@ -0,0 +1,224 @@
+use super::mock::*;
+use crate::*;
+use frame_support::{assert_noop, assert_ok};
+use frame_system::Config;
+use sp_core::U256;
+
+/***************************
+  pub fn do_start_call() tests
+*****************************/
+
+#[test]
+fn test_do_start_call_ok() {
+    new_test_ext(0).execute_with(|| {
+        let netuid: u16 = 1;
+        let tempo: u16 = 13;
+        let coldkey_account_id = U256::from(0);
+        let hotkey_account_id = U256::from(1);
+        let burn_cost = 1000;
+        //add network
+        SubtensorModule::set_burn(netuid, burn_cost);
+        add_network_without_emission_block(netuid, tempo, 0);
+        assert_eq!(FirstEmissionBlockNumber::<Test>::get(netuid), None);
+
+        // Give it some $$$ in his coldkey balance
+        SubtensorModule::add_balance_to_coldkey_account(&coldkey_account_id, 10000);
+
+        // Subscribe and check extrinsic output
+        assert_ok!(SubtensorModule::burned_register(
+            <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+            netuid,
+            hotkey_account_id
+        ));
+
+        assert_eq!(SubnetOwner::<Test>::get(netuid), coldkey_account_id);
+
+        let block_number = System::block_number() + DurationOfStartCall::get();
+        System::set_block_number(block_number);
+
+        assert_ok!(SubtensorModule::start_call(
+            <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+            netuid
+        ));
+
+        assert_eq!(
+            FirstEmissionBlockNumber::<Test>::get(netuid),
+            Some(block_number + 1)
+        );
+    });
+}
+
+#[test]
+fn test_do_start_call_fail_with_not_existed_subnet() {
+    new_test_ext(0).execute_with(|| {
+        let netuid: u16 = 1;
+        let coldkey_account_id = U256::from(0);
+        assert_noop!(
+            SubtensorModule::start_call(
+                <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+                netuid
+            ),
+            Error::<Test>::SubNetworkDoesNotExist
+        );
+    });
+}
+
+#[test]
+fn test_do_start_call_fail_not_owner() {
+    new_test_ext(0).execute_with(|| {
+        let netuid: u16 = 1;
+        let tempo: u16 = 13;
+        let coldkey_account_id = U256::from(0);
+        let hotkey_account_id = U256::from(1);
+        let wrong_owner_account_id = U256::from(2);
+        let burn_cost = 1000;
+        //add network
+        SubtensorModule::set_burn(netuid, burn_cost);
+        add_network_without_emission_block(netuid, tempo, 0);
+        // Give it some $$$ in his coldkey balance
+        SubtensorModule::add_balance_to_coldkey_account(&coldkey_account_id, 10000);
+
+        // Subscribe and check extrinsic output
+        assert_ok!(SubtensorModule::burned_register(
+            <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+            netuid,
+            hotkey_account_id
+        ));
+
+        assert_eq!(SubnetOwner::<Test>::get(netuid), coldkey_account_id);
+
+        System::set_block_number(System::block_number() + DurationOfStartCall::get());
+
+        assert_noop!(
+            SubtensorModule::start_call(
+                <<Test as Config>::RuntimeOrigin>::signed(wrong_owner_account_id),
+                netuid
+            ),
+            DispatchError::BadOrigin
+        );
+    });
+}
+
+#[test]
+fn test_do_start_call_fail_with_cannot_start_call_now() {
+    new_test_ext(0).execute_with(|| {
+        let netuid: u16 = 1;
+        let tempo: u16 = 13;
+        let coldkey_account_id = U256::from(0);
+        let hotkey_account_id = U256::from(1);
+        let burn_cost = 1000;
+        //add network
+        SubtensorModule::set_burn(netuid, burn_cost);
+        add_network_without_emission_block(netuid, tempo, 0);
+        // Give it some $$$ in his coldkey balance
+        SubtensorModule::add_balance_to_coldkey_account(&coldkey_account_id, 10000);
+
+        // Subscribe and check extrinsic output
+        assert_ok!(SubtensorModule::burned_register(
+            <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+            netuid,
+            hotkey_account_id
+        ));
+
+        assert_eq!(SubnetOwner::<Test>::get(netuid), coldkey_account_id);
+
+        assert_noop!(
+            SubtensorModule::start_call(
+                <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+                netuid
+            ),
+            Error::<Test>::NeedWaitingMoreBlocksToStarCall
+        );
+    });
+}
+
+#[test]
+fn test_do_start_call_fail_for_set_again() {
+    new_test_ext(0).execute_with(|| {
+        let netuid: u16 = 1;
+        let tempo: u16 = 13;
+        let coldkey_account_id = U256::from(0);
+        let hotkey_account_id = U256::from(1);
+        let burn_cost = 1000;
+        //add network
+        SubtensorModule::set_burn(netuid, burn_cost);
+        add_network_without_emission_block(netuid, tempo, 0);
+        assert_eq!(FirstEmissionBlockNumber::<Test>::get(netuid), None);
+
+        // Give it some $$$ in his coldkey balance
+        SubtensorModule::add_balance_to_coldkey_account(&coldkey_account_id, 10000);
+
+        // Subscribe and check extrinsic output
+        assert_ok!(SubtensorModule::burned_register(
+            <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+            netuid,
+            hotkey_account_id
+        ));
+
+        assert_eq!(SubnetOwner::<Test>::get(netuid), coldkey_account_id);
+
+        let block_number = System::block_number() + DurationOfStartCall::get();
+        System::set_block_number(block_number);
+
+        assert_ok!(SubtensorModule::start_call(
+            <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+            netuid
+        ));
+
+        assert_noop!(
+            SubtensorModule::start_call(
+                <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+                netuid
+            ),
+            Error::<Test>::FirstEmissionBlockNumberAlreadySet
+        );
+    });
+}
+
+#[test]
+fn test_do_start_call_ok_with_same_block_number_after_coinbase() {
+    new_test_ext(0).execute_with(|| {
+        let netuid: u16 = 1;
+        let tempo: u16 = 13;
+        let coldkey_account_id = U256::from(0);
+        let hotkey_account_id = U256::from(1);
+        let burn_cost = 1000;
+        //add network
+        SubtensorModule::set_burn(netuid, burn_cost);
+        add_network_without_emission_block(netuid, tempo, 0);
+        assert_eq!(FirstEmissionBlockNumber::<Test>::get(netuid), None);
+
+        // Give it some $$$ in his coldkey balance
+        SubtensorModule::add_balance_to_coldkey_account(&coldkey_account_id, 10000);
+
+        // Subscribe and check extrinsic output
+        assert_ok!(SubtensorModule::burned_register(
+            <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+            netuid,
+            hotkey_account_id
+        ));
+
+        assert_eq!(SubnetOwner::<Test>::get(netuid), coldkey_account_id);
+
+        let block_number = System::block_number() + DurationOfStartCall::get();
+        System::set_block_number(block_number);
+
+        assert_ok!(SubtensorModule::start_call(
+            <<Test as Config>::RuntimeOrigin>::signed(coldkey_account_id),
+            netuid
+        ));
+
+        assert_eq!(
+            FirstEmissionBlockNumber::<Test>::get(netuid),
+            Some(block_number + 1)
+        );
+
+        step_block(tempo);
+        match FirstEmissionBlockNumber::<Test>::get(netuid) {
+            Some(new_emission_block_number) => {
+                assert_eq!(new_emission_block_number, block_number + 1)
+            }
+            None => assert!(FirstEmissionBlockNumber::<Test>::get(netuid).is_some()),
+        }
+    });
+}
diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index 94e82ca8f3..8b390aaa59 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -205,7 +205,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
     //   `spec_version`, and `authoring_version` are the same between Wasm and native.
     // This value is set to 100 to notify Polkadot-JS App (https://polkadot.js.org/apps) to use
     //   the compatible custom types.
-    spec_version: 253,
+    spec_version: 254,
     impl_version: 1,
     apis: RUNTIME_API_VERSIONS,
     transaction_version: 1,
@@ -1018,6 +1018,7 @@ parameter_types! {
     pub const InitialDissolveNetworkScheduleDuration: BlockNumber = 5 * 24 * 60 * 60 / 12; // 5 days
     pub const SubtensorInitialTaoWeight: u64 = 971_718_665_099_567_868; // 0.05267697438728329% tao weight.
     pub const InitialEmaPriceHalvingPeriod: u64 = 201_600_u64; // 4 weeks
+    pub const DurationOfStartCall: u64 = 7 * 24 * 60 * 60 / 12; // 7 days
 }
 
 impl pallet_subtensor::Config for Runtime {
@@ -1082,6 +1083,7 @@ impl pallet_subtensor::Config for Runtime {
     type InitialColdkeySwapScheduleDuration = InitialColdkeySwapScheduleDuration;
     type InitialDissolveNetworkScheduleDuration = InitialDissolveNetworkScheduleDuration;
     type InitialEmaPriceHalvingPeriod = InitialEmaPriceHalvingPeriod;
+    type DurationOfStartCall = DurationOfStartCall;
 }
 
 use sp_runtime::BoundedVec;