--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1096,6 +1096,26 @@
 checksum = "e4c78c047431fee22c1a7bb92e00ad095a02a983affe4d8a72e2a2c62c1b94f3"
 
 [[package]]
+name = "const_format"
+version = "0.2.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "939dc9e2eb9077e0679d2ce32de1ded8531779360b003b4a972a7a39ec263495"
+dependencies = [
+ "const_format_proc_macros",
+]
+
+[[package]]
+name = "const_format_proc_macros"
+version = "0.2.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef196d5d972878a48da7decb7686eded338b4858fbabeed513d63a7c98b2b82d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
 name = "constant_time_eq"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2353,6 +2373,7 @@
 version = "0.1.3"
 dependencies = [
  "concat-idents",
+ "const_format",
  "ethereum",
  "evm-coder-procedural",
  "evm-core 0.35.0 (git+https://github.com/uniquenetwork/evm?branch=unique-polkadot-v0.9.30)",
@@ -2362,6 +2383,7 @@
  "impl-trait-for-tuples",
  "pallet-evm 6.0.0-dev (git+https://github.com/uniquenetwork/frontier?branch=unique-polkadot-v0.9.27-fee-limit)",
  "primitive-types",
+ "sha3-const",
  "similar-asserts",
  "sp-std 4.0.0 (git+https://github.com/paritytech/substrate?branch=polkadot-v0.9.30)",
 ]
@@ -11085,6 +11107,12 @@
 ]
 
 [[package]]
+name = "sha3-const"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af9625d558d174dbdc711248b479271c0fdca39e9d3d67f6e890b3d4251fbf8e"
+
+[[package]]
 name = "sharded-slab"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
--- a/crates/evm-coder/Cargo.toml
+++ b/crates/evm-coder/Cargo.toml
@@ -5,6 +5,10 @@
 edition = "2021"
 
 [dependencies]
+const_format = { version = "0.2.26", default-features = false }
+sha3-const = { version = "0.1.0", default-features = false }
+# Ethereum uses keccak (=sha3) for selectors
+# sha3 = "0.10.1"
 # evm-coder reexports those proc-macro
 evm-coder-procedural = { path = "./procedural" }
 # Evm uses primitive-types for H160, H256 and others
--- a/crates/evm-coder/procedural/src/solidity_interface.rs
+++ b/crates/evm-coder/procedural/src/solidity_interface.rs
@@ -20,6 +20,7 @@
 // about Procedural Macros in Rust book:
 // https://doc.rust-lang.org/reference/procedural-macros.html
 
+use proc_macro2::{TokenStream, Group};
 use quote::{quote, ToTokens};
 use inflector::cases;
 use std::fmt::Write;
@@ -328,6 +329,7 @@
 	}
 }
 
+#[derive(Debug)]
 enum AbiType {
 	// type
 	Plain(Ident),
@@ -473,6 +475,7 @@
 	}
 }
 
+#[derive(Debug)]
 struct MethodArg {
 	name: Ident,
 	camel_name: String,
@@ -722,13 +725,25 @@
 		}
 	}
 
+	fn expand_selector(&self) -> proc_macro2::TokenStream {
+		let custom_signature = self.expand_custom_signature();
+		quote! {
+			 {
+				let a = ::evm_coder::sha3_const::Keccak256::new()
+					.update(#custom_signature.as_bytes())
+					.finalize();
+				[a[0], a[1], a[2], a[3]]
+			}
+		}
+	}
+
 	fn expand_const(&self) -> proc_macro2::TokenStream {
 		let screaming_name = &self.screaming_name;
-		let selector = u32::to_be_bytes(self.selector);
 		let selector_str = &self.selector_str;
+		let selector = &self.expand_selector();
 		quote! {
 			#[doc = #selector_str]
-			const #screaming_name: ::evm_coder::types::bytes4 = [#(#selector,)*];
+			const #screaming_name: ::evm_coder::types::bytes4 = #selector;
 		}
 	}
 
@@ -831,6 +846,59 @@
 		}
 	}
 
+	fn expand_custom_signature(&self) -> proc_macro2::TokenStream {
+		let mut first_comma = true;
+		let mut custom_signature = TokenStream::new();
+		let mut template = self.camel_name.clone() + "(";
+		self.args
+			.iter()
+			.filter_map(|a| {
+				if a.is_special() {
+					return None;
+				};
+
+				match a.ty {
+					AbiType::Plain(ref ident) => Some(ident),
+					_ => None,
+				}
+			})
+			.for_each(|ident| {
+				if !first_comma {
+					custom_signature.extend(quote!(,));
+					template.push(',');
+				} else {
+					first_comma = false;
+				};
+				template.push_str("{}");
+				let ident_str = ident.to_string();
+				match ident_str.as_str() {
+					"address" | "uint8" | "uint16" | "uint32" | "uint64" | "uint128"
+					| "uint256" | "bytes4" | "topic" | "string" | "bytes" | "void" | "caller"
+					| "bool" | "" => {
+						custom_signature.extend(quote!(#ident_str));
+					}
+					_ => {
+						custom_signature.extend(quote! {
+							#ident::SIGNATURE_STRING
+						});
+					}
+				}
+			});
+
+		template.push(')');
+		let mut template = quote!(#template);
+		template.extend(quote!(,));
+		template.extend(custom_signature);
+		let custom_signature_group = Group::new(proc_macro2::Delimiter::Parenthesis, template);
+		let mut custom_signature = quote! {
+			::evm_coder::const_format::formatcp!
+		};
+		custom_signature.extend(custom_signature_group.to_token_stream());
+
+		// println!("!!!!! {}", custom_signature);
+		custom_signature
+	}
+
 	fn expand_solidity_function(&self) -> proc_macro2::TokenStream {
 		let camel_name = &self.camel_name;
 		let mutability = match self.mutability {
@@ -847,15 +915,17 @@
 			.map(MethodArg::expand_solidity_argument);
 		let docs = &self.docs;
 		let selector_str = &self.selector_str;
-		let selector = self.selector;
+		let selector = &self.expand_selector();
 		let hide = self.hide;
+		let custom_signature = self.expand_custom_signature();
 		let is_payable = self.has_value_args;
 		quote! {
 			SolidityFunction {
 				docs: &[#(#docs),*],
 				selector_str: #selector_str,
-				selector: #selector,
 				hide: #hide,
+				selector: u32::from_be_bytes(#selector),
+				custom_signature: #custom_signature,
 				name: #camel_name,
 				mutability: #mutability,
 				is_payable: #is_payable,
--- a/crates/evm-coder/src/lib.rs
+++ b/crates/evm-coder/src/lib.rs
@@ -90,6 +90,8 @@
 pub use evm_coder_procedural::solidity;
 /// See [`solidity_interface`]
 pub use evm_coder_procedural::weight;
+pub use const_format;
+pub use sha3_const;
 
 /// Derives [`ToLog`] for enum
 ///
@@ -227,6 +229,14 @@
 		}
 	}
 
+	impl SignatureString for EthCrossAccount {
+		const SIGNATURE_STRING: &'static str = "(address,uint256)";
+	}
+
+	pub trait SignatureString {
+		const SIGNATURE_STRING: &'static str;
+	}
+
 	/// Convert `CrossAccountId` to `uint256`.
 	pub fn convert_cross_account_to_uint256<T: pallet_evm::account::Config>(
 		from: &T::CrossAccountId,
@@ -348,6 +358,18 @@
 		assert_eq!(fn_selector!(transfer(address, uint256)), 0xa9059cbb);
 	}
 
+	// #[test]
+	// fn function_selector_generation_1() {
+	// 	assert_eq!(
+	// 		fn_selector!(transferFromCrossAccountToCrossAccount(
+	// 			EthCrossAccount,
+	// 			EthCrossAccount,
+	// 			uint256
+	// 		)),
+	// 		2543295963
+	// 	);
+	// }
+
 	#[test]
 	fn event_topic_generation() {
 		assert_eq!(
--- a/crates/evm-coder/src/solidity.rs
+++ b/crates/evm-coder/src/solidity.rs
@@ -35,6 +35,12 @@
 use crate::types::*;
 
 #[derive(Default)]
+pub struct FunctionSelectorMaker {
+	pub name: string,
+	pub args: Vec<fn() -> string>,
+}
+
+#[derive(Default)]
 pub struct TypeCollector {
 	/// Code => id
 	/// id ordering is required to perform topo-sort on the resulting data
@@ -482,11 +488,25 @@
 	View,
 	Mutable,
 }
+
+// fn fn_selector_str(input: &str) -> u32 {
+// 	use sha3::Digest;
+// 	let mut hasher = sha3::Keccak256::new();
+// 	hasher.update(input.as_bytes());
+// 	let result = hasher.finalize();
+
+// 	let mut selector_bytes = [0; 4];
+// 	selector_bytes.copy_from_slice(&result[0..4]);
+
+// 	u32::from_be_bytes(selector_bytes)
+// }
+
 pub struct SolidityFunction<A, R> {
 	pub docs: &'static [&'static str],
 	pub selector_str: &'static str,
 	pub selector: u32,
 	pub hide: bool,
+	pub custom_signature: &'static str,
 	pub name: &'static str,
 	pub args: A,
 	pub result: R,
@@ -512,7 +532,7 @@
 		writeln!(
 			writer,
 			"\t{hide_comment}///  or in textual repr: {}",
-			self.selector_str
+			self.custom_signature
 		)?;
 		write!(writer, "\t{hide_comment}function {}(", self.name)?;
 		self.args.solidity_name(writer, tc)?;
--- a/pallets/evm-contract-helpers/Cargo.toml
+++ b/pallets/evm-contract-helpers/Cargo.toml
@@ -27,7 +27,7 @@
 evm-coder = { default-features = false, path = '../../crates/evm-coder' }
 pallet-common = { default-features = false, path = '../../pallets/common' }
 pallet-evm-coder-substrate = { default-features = false, path = '../../pallets/evm-coder-substrate' }
-pallet-evm-transaction-payment = {  default-features = false, path = '../../pallets/evm-transaction-payment' }
+pallet-evm-transaction-payment = { default-features = false, path = '../../pallets/evm-transaction-payment' }
 up-data-structs = { default-features = false, path = '../../primitives/data-structs', features = [
     'serde1',
 ] }
--- a/pallets/evm-contract-helpers/src/eth.rs
+++ b/pallets/evm-contract-helpers/src/eth.rs
@@ -16,6 +16,8 @@
 
 //! Implementation of magic contract
 
+extern crate alloc;
+use alloc::{format, string::ToString};
 use core::marker::PhantomData;
 use evm_coder::{
 	abi::AbiWriter, execution::Result, generate_stubgen, solidity_interface, types::*, ToLog,
--- a/pallets/fungible/src/erc.rs
+++ b/pallets/fungible/src/erc.rs
@@ -16,6 +16,8 @@
 
 //! ERC-20 standart support implementation.
 
+extern crate alloc;
+use alloc::{format, string::ToString};
 use core::char::{REPLACEMENT_CHARACTER, decode_utf16};
 use core::convert::TryInto;
 use evm_coder::{ToLog, execution::*, generate_stubgen, solidity_interface, types::*, weight};
--- a/pallets/nonfungible/src/erc.rs
+++ b/pallets/nonfungible/src/erc.rs
@@ -20,6 +20,7 @@
 //! Method implementations are mostly doing parameter conversion and calling Nonfungible Pallet methods.
 
 extern crate alloc;
+use alloc::{format, string::ToString};
 use core::{
 	char::{REPLACEMENT_CHARACTER, decode_utf16},
 	convert::TryInto,
--- a/pallets/refungible/Cargo.toml
+++ b/pallets/refungible/Cargo.toml
@@ -26,7 +26,9 @@
 struct-versioning = { path = "../../crates/struct-versioning" }
 up-data-structs = { default-features = false, path = '../../primitives/data-structs' }
 ethereum = { version = "0.12.0", default-features = false }
-scale-info = { version = "2.0.1", default-features = false, features = ["derive",] }
+scale-info = { version = "2.0.1", default-features = false, features = [
+    "derive",
+] }
 derivative = { version = "2.2.0", features = ["use_core"] }
 
 [features]
--- a/pallets/refungible/src/erc.rs
+++ b/pallets/refungible/src/erc.rs
@@ -21,6 +21,7 @@
 
 extern crate alloc;
 
+use alloc::{format, string::ToString};
 use core::{
 	char::{REPLACEMENT_CHARACTER, decode_utf16},
 	convert::TryInto,