diff --git a/listings/applications/coin_flip/src/contract.cairo b/listings/applications/coin_flip/src/contract.cairo
index 2ac6929d..3955505c 100644
--- a/listings/applications/coin_flip/src/contract.cairo
+++ b/listings/applications/coin_flip/src/contract.cairo
@@ -5,6 +5,7 @@ pub trait ICoinFlip<TContractState> {
     fn flip(ref self: TContractState);
 }
 
+// declares just the pragma_lib::abi::IRandomness.receive_random_words function
 #[starknet::interface]
 pub trait IPragmaVRF<TContractState> {
     fn receive_random_words(
@@ -19,10 +20,7 @@ pub trait IPragmaVRF<TContractState> {
 #[starknet::contract]
 pub mod CoinFlip {
     use core::num::traits::zero::Zero;
-    use starknet::{
-        ContractAddress, contract_address_const, get_caller_address, get_contract_address,
-        get_block_number
-    };
+    use starknet::{ContractAddress, get_caller_address, get_contract_address,};
     use pragma_lib::abi::{IRandomnessDispatcher, IRandomnessDispatcherTrait};
     use openzeppelin::token::erc20::interface::{IERC20Dispatcher, IERC20DispatcherTrait};
 
@@ -69,7 +67,7 @@ pub mod CoinFlip {
         pub const TRANSFER_FAILED: felt252 = 'Transfer failed';
     }
 
-    pub const PUBLISH_DELAY: u64 = 0; // return the random value asap
+    pub const PUBLISH_DELAY: u64 = 1; // return the random value asap
     pub const NUM_OF_WORDS: u64 = 1; // one random value is sufficient
     pub const CALLBACK_FEE_LIMIT: u128 = 100_000_000_000_000; // 0.0001 ETH
     pub const MAX_CALLBACK_FEE_DEPOSIT: u256 =
diff --git a/listings/applications/coin_flip/src/mock_randomness.cairo b/listings/applications/coin_flip/src/mock_randomness.cairo
index 79750aa3..f37e3f5e 100644
--- a/listings/applications/coin_flip/src/mock_randomness.cairo
+++ b/listings/applications/coin_flip/src/mock_randomness.cairo
@@ -4,8 +4,6 @@ pub mod MockRandomness {
     use pragma_lib::types::RequestStatus;
     use starknet::{ContractAddress, ClassHash, get_caller_address, get_contract_address};
     use core::num::traits::zero::Zero;
-    use core::poseidon::PoseidonTrait;
-    use core::hash::{HashStateTrait, HashStateExTrait};
     use coin_flip::contract::{IPragmaVRFDispatcher, IPragmaVRFDispatcherTrait};
     use openzeppelin::token::erc20::interface::{IERC20Dispatcher, IERC20DispatcherTrait};
 
diff --git a/listings/applications/coin_flip/src/tests.cairo b/listings/applications/coin_flip/src/tests.cairo
index 64aaafc2..66d36588 100644
--- a/listings/applications/coin_flip/src/tests.cairo
+++ b/listings/applications/coin_flip/src/tests.cairo
@@ -1,14 +1,9 @@
-use coin_flip::contract::{
-    CoinFlip, ICoinFlipDispatcher, ICoinFlipDispatcherTrait, IPragmaVRFDispatcher,
-    IPragmaVRFDispatcherTrait
-};
+use coin_flip::contract::{CoinFlip, ICoinFlipDispatcher, ICoinFlipDispatcherTrait,};
 use coin_flip::mock_randomness::MockRandomness;
-use starknet::{
-    ContractAddress, ClassHash, get_block_timestamp, contract_address_const, get_caller_address
-};
+use starknet::{ContractAddress, contract_address_const};
 use snforge_std::{
-    declare, ContractClass, ContractClassTrait, start_cheat_caller_address,
-    stop_cheat_caller_address, spy_events, SpyOn, EventSpy, EventAssertions, get_class_hash
+    declare, start_cheat_caller_address, stop_cheat_caller_address, spy_events, EventAssertions, SpyOn,
+    ContractClassTrait
 };
 use openzeppelin::token::erc20::interface::{IERC20Dispatcher, IERC20DispatcherTrait};
 use pragma_lib::abi::{IRandomnessDispatcher, IRandomnessDispatcherTrait};