diff --git a/changelog.md b/changelog.md
index 56dd363d05..120b77cfd3 100644
--- a/changelog.md
+++ b/changelog.md
@@ -2,6 +2,12 @@
 
 ## Unreleased
 
+### Features
+
+### Fixes
+
+* [1535](https://github.com/zeta-chain/node/issues/1535) - Avoid voting on wrong ballots due to false blockNumber in EVM tx receipt
+
 ## Version: v12.0.0
 
 ### Breaking Changes
@@ -35,6 +41,7 @@ Getting the correct TSS address for Bitcoin now requires proviidng the Bitcoin c
 
 ### Fixes
 
+* [1576](https://github.com/zeta-chain/node/pull/1576) - Fix zetaclient crash due to out of bound integer conversion and log prints.
 * [1575](https://github.com/zeta-chain/node/issues/1575) - Skip unsupported chain parameters by IsSupported flag
 * [1554](https://github.com/zeta-chain/node/pull/1554) - Screen out unconfirmed UTXOs that are not created by TSS itself
 * [1560](https://github.com/zeta-chain/node/issues/1560) - Zetaclient post evm-chain outtx hashes only when receipt is available
diff --git a/zetaclient/bitcoin_client.go b/zetaclient/bitcoin_client.go
index a316e3b4ac..a82e3a44cb 100644
--- a/zetaclient/bitcoin_client.go
+++ b/zetaclient/bitcoin_client.go
@@ -1326,7 +1326,7 @@ func (ob *BitcoinChainClient) LoadLastBlock() error {
 	if ob.chain.ChainId == 18444 { // bitcoin regtest: start from block 100
 		ob.SetLastBlockHeightScanned(100)
 	}
-	ob.logger.ChainLogger.Info().Msgf("%s: start scanning from block %d", ob.chain.String(), ob.lastBlock)
+	ob.logger.ChainLogger.Info().Msgf("%s: start scanning from block %d", ob.chain.String(), ob.GetLastBlockHeightScanned())
 
 	return nil
 }
diff --git a/zetaclient/evm_client.go b/zetaclient/evm_client.go
index 8a68ac121e..d88ee980f9 100644
--- a/zetaclient/evm_client.go
+++ b/zetaclient/evm_client.go
@@ -59,7 +59,7 @@ type EVMLog struct {
 const (
 	DonationMessage    = "I am rich!"
 	TopicsZetaSent     = 3 // [signature, zetaTxSenderAddress, destinationChainId] https://github.com/zeta-chain/protocol-contracts/blob/d65814debf17648a6c67d757ba03646415842790/contracts/evm/ZetaConnector.base.sol#L34
-	TopicsZetaReceived = 4 // [signature, sourceChainId, destinationAddress]       https://github.com/zeta-chain/protocol-contracts/blob/d65814debf17648a6c67d757ba03646415842790/contracts/evm/ZetaConnector.base.sol#L45
+	TopicsZetaReceived = 4 // [signature, sourceChainId, destinationAddress, internalSendHash] https://github.com/zeta-chain/protocol-contracts/blob/d65814debf17648a6c67d757ba03646415842790/contracts/evm/ZetaConnector.base.sol#L45
 	TopicsZetaReverted = 3 // [signature, destinationChainId, internalSendHash]    https://github.com/zeta-chain/protocol-contracts/blob/d65814debf17648a6c67d757ba03646415842790/contracts/evm/ZetaConnector.base.sol#L54
 	TopicsWithdrawn    = 3 // [signature, recipient, asset] https://github.com/zeta-chain/protocol-contracts/blob/d65814debf17648a6c67d757ba03646415842790/contracts/evm/ERC20Custody.sol#L43
 	TopicsDeposited    = 2 // [signature, asset]            https://github.com/zeta-chain/protocol-contracts/blob/d65814debf17648a6c67d757ba03646415842790/contracts/evm/ERC20Custody.sol#L42
@@ -721,14 +721,29 @@ func (ob *EVMChainClient) checkConfirmedTx(txHash string, nonce uint64) (*ethtyp
 		return nil, nil, false
 	}
 
-	// check confirmations
-	confHeight := receipt.BlockNumber.Uint64() + ob.GetChainParams().ConfirmationCount
-	if confHeight >= math.MaxInt64 {
-		log.Error().Msgf("confirmTxByHash: confHeight is too large for txHash %s nonce %d", txHash, nonce)
+	// cross-check receipt against the block
+	block, err := ob.GetBlockByNumberCached(receipt.BlockNumber.Uint64())
+	if err != nil {
+		log.Error().Err(err).Msgf("confirmTxByHash: GetBlockByNumberCached error, txHash %s nonce %d block %d",
+			txHash, nonce, receipt.BlockNumber)
+		return nil, nil, false
+	}
+	// #nosec G701 non negative value
+	if receipt.TransactionIndex >= uint(len(block.Transactions())) {
+		log.Error().Msgf("confirmTxByHash: transaction index %d out of range [0, %d), txHash %s nonce %d block %d",
+			receipt.TransactionIndex, len(block.Transactions()), txHash, nonce, receipt.BlockNumber)
 		return nil, nil, false
 	}
-	if confHeight > ob.GetLastBlockHeight() {
-		log.Info().Msgf("confirmTxByHash: txHash %s nonce %d included but not confirmed: receipt block %d, current block %d",
+	txAtIndex := block.Transactions()[receipt.TransactionIndex]
+	if txAtIndex.Hash() != transaction.Hash() {
+		log.Error().Msgf("confirmTxByHash: transaction at index %d has different hash %s, txHash %s nonce %d block %d",
+			receipt.TransactionIndex, txAtIndex.Hash().Hex(), txHash, nonce, receipt.BlockNumber)
+		return nil, nil, false
+	}
+
+	// check confirmations
+	if !ob.HasEnoughConfirmations(receipt, ob.GetLastBlockHeight()) {
+		log.Debug().Msgf("confirmTxByHash: txHash %s nonce %d included but not confirmed: receipt block %d, current block %d",
 			txHash, nonce, receipt.BlockNumber, ob.GetLastBlockHeight())
 		return nil, nil, false
 	}
@@ -848,11 +863,11 @@ func (ob *EVMChainClient) observeInTX(sampledLogger zerolog.Logger) error {
 	}
 
 	// get and update latest block height
-	header, err := ob.evmClient.HeaderByNumber(context.Background(), nil)
+	blockNumber, err := ob.evmClient.BlockNumber(context.Background())
 	if err != nil {
 		return err
 	}
-	ob.SetLastBlockHeight(header.Number.Uint64())
+	ob.SetLastBlockHeight(blockNumber)
 
 	// increment prom counter
 	counter, err := ob.GetPromCounter("rpc_getBlockByNumber_count")
@@ -862,10 +877,10 @@ func (ob *EVMChainClient) observeInTX(sampledLogger zerolog.Logger) error {
 	counter.Inc()
 
 	// skip if current height is too low
-	if header.Number.Uint64() < ob.GetChainParams().ConfirmationCount {
-		return fmt.Errorf("observeInTX: skipping observer, current block number %d is too low", header.Number.Uint64())
+	if blockNumber < ob.GetChainParams().ConfirmationCount {
+		return fmt.Errorf("observeInTX: skipping observer, current block number %d is too low", blockNumber)
 	}
-	confirmedBlockNum := header.Number.Uint64() - ob.GetChainParams().ConfirmationCount
+	confirmedBlockNum := blockNumber - ob.GetChainParams().ConfirmationCount
 
 	// skip if no new block is confirmed
 	lastScanned := ob.GetLastBlockHeightScanned()
diff --git a/zetaclient/zetacore_observer.go b/zetaclient/zetacore_observer.go
index 51078aefd2..aff055c74f 100644
--- a/zetaclient/zetacore_observer.go
+++ b/zetaclient/zetacore_observer.go
@@ -2,6 +2,7 @@ package zetaclient
 
 import (
 	"fmt"
+	"math"
 	"strings"
 	"time"
 
@@ -158,7 +159,7 @@ func (co *CoreObserver) startCctxScheduler() {
 						co.logger.ZetaChainWatcher.Error().Err(err).Msgf("couldn't get operator balance")
 					} else {
 						diff := co.lastOperatorBalance.Sub(balance)
-						if diff.GT(sdkmath.NewInt(0)) {
+						if diff.GT(sdkmath.NewInt(0)) && diff.LT(sdkmath.NewInt(math.MaxInt64)) {
 							co.ts.AddFeeEntry(bn, diff.Int64())
 							co.lastOperatorBalance = balance
 						}
@@ -355,7 +356,7 @@ func (co *CoreObserver) getUpdatedChainOb(chainID int64) (ChainClient, error) {
 	curParams := chainOb.GetChainParams()
 	if common.IsEVMChain(chainID) {
 		evmCfg, found := co.cfg.GetEVMConfig(chainID)
-		if found && curParams != evmCfg.ChainParams {
+		if found && curParams.String() != evmCfg.ChainParams.String() {
 			chainOb.SetChainParams(evmCfg.ChainParams)
 			co.logger.ZetaChainWatcher.Info().Msgf(
 				"updated chain params for chainID %d, new params: %v",
@@ -365,7 +366,7 @@ func (co *CoreObserver) getUpdatedChainOb(chainID int64) (ChainClient, error) {
 		}
 	} else if common.IsBitcoinChain(chainID) {
 		_, btcCfg, found := co.cfg.GetBTCConfig()
-		if found && curParams != btcCfg.ChainParams {
+		if found && curParams.String() != btcCfg.ChainParams.String() {
 			chainOb.SetChainParams(btcCfg.ChainParams)
 			co.logger.ZetaChainWatcher.Info().Msgf(
 				"updated chain params for Bitcoin, new params: %v",