Add getNetworkRegistrationBlock view to SubnetPrecompile

contract-tests/src/contracts/precompileWrapper.sol

@@ -35,6 +35,7 @@ interface ISubnet {
         string memory additional
     ) external payable;
     function getServingRateLimit(uint16 netuid) external view returns (uint64);
+    function getNetworkRegistrationBlock(uint16 netuid) external view returns (uint64);
 }
 
 interface INeuron {
@@ -223,6 +224,10 @@ contract PrecompileWrapper {
         return subnet.getServingRateLimit(netuid);
     }
 
+    function getNetworkRegistrationBlock(uint16 netuid) external view returns (uint64) {
+        return subnet.getNetworkRegistrationBlock(netuid);
+    }
+
     // ============ Neuron Functions ============
 
     function burnedRegister(uint16 netuid, bytes32 hotkey) external payable {

contract-tests/src/contracts/subnet.ts

@@ -291,6 +291,25 @@ export const ISubnetABI = [
         stateMutability: "view",
         type: "function",
     },
+    {
+        inputs: [
+            {
+                internalType: "uint16",
+                name: "netuid",
+                type: "uint16",
+            },
+        ],
+        name: "getNetworkRegistrationBlock",
+        outputs: [
+            {
+                internalType: "uint64",
+                name: "",
+                type: "uint64",
+            },
+        ],
+        stateMutability: "view",
+        type: "function",
+    },
     {
         inputs: [
             {

contract-tests/test/precompileWrapper.direct-call.test.ts

@@ -88,6 +88,15 @@ describe("PrecompileWrapper - Direct Call Tests", () => {
             assert.ok(rateLimitViaWrapper !== undefined, "Rate limit should be not undefined");
         });
 
+        it("Should get network registered block via wrapper", async () => {
+            const onchainValue = await api.query.SubtensorModule.NetworkRegisteredAt.getValue(netuid);
+
+            const valueViaWrapper = Number(await wrapperContract.getNetworkRegistrationBlock(netuid));
+
+            assert.ok(valueViaWrapper > 0, "Network registered block should be greater than 0");
+            assert.equal(valueViaWrapper, onchainValue, "Network registered block should match on-chain value");
+        });
+
         it("Should register network with details via wrapper", async () => {
             const newHotkey = getRandomSubstrateKeypair();
             await forceSetBalanceToSs58Address(api, convertPublicKeyToSs58(newHotkey.publicKey));

precompiles/src/subnet.rs

@@ -5,7 +5,10 @@ use frame_support::traits::ConstU32;
 use frame_support::traits::IsSubType;
 use frame_system::RawOrigin;
 use pallet_evm::{AddressMapping, PrecompileHandle};
-use precompile_utils::{EvmResult, prelude::BoundedString};
+use precompile_utils::{
+    EvmResult,
+    prelude::{BoundedString, RuntimeHelper},
+};
 use sp_core::H256;
 use sp_runtime::traits::{AsSystemOriginSigner, Dispatchable};
 use sp_std::vec;
@@ -161,6 +164,18 @@ where
         )
     }
 
+    #[precompile::public("getNetworkRegistrationBlock(uint16)")]
+    #[precompile::view]
+    fn get_network_registration_block(
+        handle: &mut impl PrecompileHandle,
+        netuid: u16,
+    ) -> EvmResult<u64> {
+        handle.record_cost(RuntimeHelper::<R>::db_read_gas_cost())?;
+        Ok(pallet_subtensor::NetworkRegisteredAt::<R>::get(
+            NetUid::from(netuid),
+        ))
+    }
+
     #[precompile::public("getServingRateLimit(uint16)")]
     #[precompile::view]
     fn get_serving_rate_limit(_: &mut impl PrecompileHandle, netuid: u16) -> EvmResult<u64> {
@@ -1225,4 +1240,28 @@ mod tests {
             );
         });
     }
+
+    #[test]
+    fn subnet_precompile_gets_network_registered_block() {
+        new_test_ext().execute_with(|| {
+            let caller = addr_from_index(0x5003);
+            let netuid = setup_owner_subnet(caller);
+            let precompiles = precompiles::<SubnetPrecompile<Runtime>>();
+            let precompile_addr = addr_from_index(SubnetPrecompile::<Runtime>::INDEX);
+
+            let registration_block: u64 = 42;
+            pallet_subtensor::NetworkRegisteredAt::<Runtime>::insert(netuid, registration_block);
+
+            assert_static_call(
+                &precompiles,
+                caller,
+                precompile_addr,
+                encode_with_selector(
+                    selector_u32("getNetworkRegistrationBlock(uint16)"),
+                    (TEST_NETUID_U16,),
+                ),
+                U256::from(registration_block),
+            );
+        });
+    }
 }

runtime/src/lib.rs

@@ -277,7 +277,7 @@ 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: 415,
+    spec_version: 416,
     impl_version: 1,
     apis: RUNTIME_API_VERSIONS,
     transaction_version: 1,