diff --git a/modAion/src/org/aion/zero/types/AionTransaction.java b/modAion/src/org/aion/zero/types/AionTransaction.java
index fe7eaba796..4867e0b010 100644
--- a/modAion/src/org/aion/zero/types/AionTransaction.java
+++ b/modAion/src/org/aion/zero/types/AionTransaction.java
@@ -284,7 +284,7 @@ public boolean isContractCreation() {
         if (!parsed) {
             rlpParse();
         }
-        return (this.to == null || this.to.equals(Address.EMPTY_ADDRESS()));
+        return (this.to == null || this.to.isEmptyAddress());
     }
 
     @Override
diff --git a/modAionBase/src/org/aion/base/type/Address.java b/modAionBase/src/org/aion/base/type/Address.java
index c94f649d07..2ec634b2b7 100644
--- a/modAionBase/src/org/aion/base/type/Address.java
+++ b/modAionBase/src/org/aion/base/type/Address.java
@@ -174,4 +174,8 @@ public static final Address ZERO_ADDRESS() {
     public static final Address EMPTY_ADDRESS() {
         return emptyAddr;
     }
+
+    public final boolean isEmptyAddress() { return this.equals(emptyAddr); }
+
+    public final boolean isZeroAddress() { return this.equals(zeroAddr); }
 }
diff --git a/modAionImpl/src/org/aion/zero/impl/AionBlockchainImpl.java b/modAionImpl/src/org/aion/zero/impl/AionBlockchainImpl.java
index 36621de7dc..344dbad37c 100644
--- a/modAionImpl/src/org/aion/zero/impl/AionBlockchainImpl.java
+++ b/modAionImpl/src/org/aion/zero/impl/AionBlockchainImpl.java
@@ -237,7 +237,7 @@ protected AionBlockchainImpl(final A0BCConfig config,
 
         this.minerCoinbase = this.config.getMinerCoinbase();
 
-        if (minerCoinbase.equals(Address.EMPTY_ADDRESS())) {
+        if (minerCoinbase.isEmptyAddress()) {
             LOG.warn("No miner Coinbase!");
         }
 
diff --git a/modAionImpl/src/org/aion/zero/impl/blockchain/AionImpl.java b/modAionImpl/src/org/aion/zero/impl/blockchain/AionImpl.java
index 98a559baf3..ff11b4fdd9 100644
--- a/modAionImpl/src/org/aion/zero/impl/blockchain/AionImpl.java
+++ b/modAionImpl/src/org/aion/zero/impl/blockchain/AionImpl.java
@@ -103,7 +103,7 @@ public IMineRunner getBlockMiner() {
 
         Address minerCoinbase = Address.wrap(this.cfg.getConsensus().getMinerAddress());
 
-        if (minerCoinbase.equals(Address.EMPTY_ADDRESS())) {
+        if (minerCoinbase.isEmptyAddress()) {
             LOG_GEN.info("Miner address is not set");
             return null;
         }
diff --git a/modApiServer/src/org/aion/api/server/ApiAion.java b/modApiServer/src/org/aion/api/server/ApiAion.java
index cc2e3f74c6..bcbece4e8b 100644
--- a/modApiServer/src/org/aion/api/server/ApiAion.java
+++ b/modApiServer/src/org/aion/api/server/ApiAion.java
@@ -461,8 +461,10 @@ protected byte[] doCall(ArgTxCall _params) {
     }
 
     protected long estimateNrg(ArgTxCall params) {
-        AionTransaction tx = new AionTransaction(params.getNonce().toByteArray(), params.getFrom(), params.getTo(),
+        Address fromAddr = (params.getFrom().isEmptyAddress()) ? Address.ZERO_ADDRESS() : params.getFrom();
+        AionTransaction tx = new AionTransaction(params.getNonce().toByteArray(), fromAddr, params.getTo(),
                 params.getValue().toByteArray(), params.getData(), params.getNrg(), params.getNrgPrice());
+
         AionTxReceipt receipt = this.ac.callConstant(tx, this.ac.getAionHub().getBlockchain().getBestBlock());
         return receipt.getEnergyUsed();
     }
@@ -471,7 +473,7 @@ protected ContractCreateResult createContract(ArgTxCall _params) {
 
         Address from = _params.getFrom();
 
-        if (from == null || from.equals(Address.EMPTY_ADDRESS())) {
+        if (from == null || from.isEmptyAddress()) {
             return null;
         }
 
@@ -537,7 +539,7 @@ protected byte[] sendTransaction(ArgTxCall _params) {
 
         Address from = _params.getFrom();
 
-        if (from == null || from.equals(Address.EMPTY_ADDRESS())) {
+        if (from == null || from.isEmptyAddress()) {
             LOG.error("<send-transaction msg=invalid-from-address>");
             return null;
         }
diff --git a/modPrecompiled/src/org/aion/precompiled/contracts/AionAuctionContract.java b/modPrecompiled/src/org/aion/precompiled/contracts/AionAuctionContract.java
index 81dd957879..1d0cba80f4 100644
--- a/modPrecompiled/src/org/aion/precompiled/contracts/AionAuctionContract.java
+++ b/modPrecompiled/src/org/aion/precompiled/contracts/AionAuctionContract.java
@@ -617,7 +617,7 @@ private boolean hasActiveParentDomain(String domainName){
             } catch (UnsupportedEncodingException e) {
                 e.printStackTrace();
             }
-            if (!parentAddr.equals(Address.ZERO_ADDRESS())) {
+            if (!parentAddr.isZeroAddress()) {
                 if (isActiveDomain(parentAddr)) return true;
             }
         }
diff --git a/modPrecompiled/src/org/aion/precompiled/contracts/AionNameServiceContract.java b/modPrecompiled/src/org/aion/precompiled/contracts/AionNameServiceContract.java
index 14a7ae72e8..292f54ab49 100644
--- a/modPrecompiled/src/org/aion/precompiled/contracts/AionNameServiceContract.java
+++ b/modPrecompiled/src/org/aion/precompiled/contracts/AionNameServiceContract.java
@@ -655,7 +655,7 @@ public Address getRegisteredDomainAddress(String domainName){
         byte[] addressFirstPart = this.track.getStorageValue(registeredDomainNameAddress, new DataWord(blake128(domainName.getBytes()))).getData();
         byte[] addressSecondPart = this.track.getStorageValue(registeredDomainNameAddress, new DataWord(blake128(blake128(domainName.getBytes())))).getData();
         Address domainAddress = Address.wrap(combineTwoBytes(addressFirstPart, addressSecondPart));
-        if (domainAddress.equals(Address.ZERO_ADDRESS()))
+        if (domainAddress.isZeroAddress())
             return null;
         return domainAddress;
     }