From be4d236b96fde104bb8b97f5a020b6c4a6b5549b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Federico=20Kunze=20K=C3=BCllmer?=
 <31522760+fedekunze@users.noreply.github.com>
Date: Fri, 3 Nov 2023 11:28:09 +0100
Subject: [PATCH 1/2] feat(werc20): WERC20 transactions

---
 precompiles/werc20/tx.go | 46 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/precompiles/werc20/tx.go b/precompiles/werc20/tx.go
index cf5bea0572..a50de990c0 100644
--- a/precompiles/werc20/tx.go
+++ b/precompiles/werc20/tx.go
@@ -3,6 +3,12 @@
 
 package werc20
 
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/core/vm"
+)
+
 const (
 	// DepositMethod defines the ABI method name for the IWERC20 deposit
 	// transaction.
@@ -11,3 +17,43 @@ const (
 	// transaction.
 	WithdrawMethod = "withdraw"
 )
+
+// Deposit is a no-op and mock function that provides the same interface as the
+// WETH contract to support equality between the native coin and its wrapped
+// ERC-20 (eg. EVMOS and WEVMOS). It only emits the Deposit event.
+func (p Precompile) Deposit(
+	ctx sdk.Context,
+	contract *vm.Contract,
+	stateDB vm.StateDB,
+	_ *abi.Method,
+	_ []interface{},
+) ([]byte, error) {
+	dst := contract.Caller()
+	amount := contract.Value()
+
+	if err := p.EmitDepositEvent(ctx, stateDB, dst, amount); err != nil {
+		return nil, err
+	}
+
+	return nil, nil
+}
+
+// Withdraw is a no-op and mock function that provides the same interface as the
+// WETH contract to support equality between the native coin and its wrapped
+// ERC-20 (eg. EVMOS and WEVMOS). It only emits the Withdraw event.
+func (p Precompile) Withdraw(
+	ctx sdk.Context,
+	contract *vm.Contract,
+	stateDB vm.StateDB,
+	_ *abi.Method,
+	_ []interface{},
+) ([]byte, error) {
+	src := contract.Caller()
+	amount := contract.Value()
+
+	if err := p.EmitWithdrawEvent(ctx, stateDB, src, amount); err != nil {
+		return nil, err
+	}
+
+	return nil, nil
+}

From 30e93c9ba79530f08b94cd0fd46c311b693b1c49 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Federico=20Kunze=20K=C3=BCllmer?=
 <31522760+fedekunze@users.noreply.github.com>
Date: Fri, 3 Nov 2023 11:29:41 +0100
Subject: [PATCH 2/2] changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 830195224a..e3f4bf7295 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -40,6 +40,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Features
 
 - (p256) [#1922](https://github.com/evmos/evmos/pull/1922) [EIP-7212](https://eips.ethereum.org/EIPS/eip-7212) `secp256r1` curve precompile
+- (werc20) [#1991](https://github.com/evmos/evmos/pull/1991) Add WERC-20 Precompile transactions.
 
 ### Improvements