diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d03e402a..2cd9150f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## 0.8.1
+*Dec 10th, 2018*
+
+IMPROVEMENT
+
+- [core] Speed-up tx processing
+
+BUG FIXES
+
+- [config] Change default seed node
+
 ## 0.8.0
 *Dec 3rd, 2018*
 
diff --git a/config/config.go b/config/config.go
index 1b3c5029a..11090b71b 100644
--- a/config/config.go
+++ b/config/config.go
@@ -51,7 +51,7 @@ func init() {
 func DefaultConfig() *Config {
 	cfg := defaultConfig()
 
-	cfg.P2P.Seeds = "d20522aa7ba4af8139749c5e724063c4ba18c58b@minter-node-2.testnet.minter.network:26656"
+	cfg.P2P.Seeds = "647e32df3b9c54809b5aca2877d9ba60900bc2d9@minter-node-1.testnet.minter.network:26656"
 
 	cfg.TxIndex = &tmConfig.TxIndexConfig{
 		Indexer:      "kv",
diff --git a/core/transaction/transaction.go b/core/transaction/transaction.go
index a87e189e7..aa71d964b 100644
--- a/core/transaction/transaction.go
+++ b/core/transaction/transaction.go
@@ -52,6 +52,7 @@ type Transaction struct {
 	decodedData Data
 	sig         *Signature
 	multisig    *SignatureMulti
+	sender      *types.Address
 }
 
 type Signature struct {
@@ -190,14 +191,24 @@ func (tx *Transaction) SetSignature(sig []byte) {
 }
 
 func (tx *Transaction) Sender() (types.Address, error) {
+	if tx.sender != nil {
+		return *tx.sender, nil
+	}
+
 	switch tx.SignatureType {
 	case SigTypeSingle:
-		return RecoverPlain(tx.Hash(), tx.sig.R, tx.sig.S, tx.sig.V)
+		sender, err := RecoverPlain(tx.Hash(), tx.sig.R, tx.sig.S, tx.sig.V)
+		if err != nil {
+			return types.Address{}, err
+		}
+
+		tx.sender = &sender
+		return sender, nil
 	case SigTypeMulti:
 		return tx.multisig.Multisig, nil
-	default:
-		return types.Address{}, errors.New("unknown signature type")
 	}
+
+	return types.Address{}, errors.New("unknown signature type")
 }
 
 func (tx *Transaction) Hash() types.Hash {
diff --git a/docker-compose.yml b/docker-compose.yml
index 83f0227d3..1ec30d42e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,7 @@
 version: "3.4"
 services:
   minter:
-    image: minterteam/minter:0.8.0
+    image: minterteam/minter:0.8.1
     volumes:
       - ~/.minter:/minter
     ports:
diff --git a/docs/api.rst b/docs/api.rst
index a164f1002..9415fe2f5 100755
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -331,7 +331,7 @@ Returns full list of candidates.
 
 .. code-block:: bash
 
-    curl -s 'localhost:8841/events?height={height}'
+    curl -s 'localhost:8841/candidates?height={height}'
 
 .. code-block:: json
 
diff --git a/version/version.go b/version/version.go
index a65cab728..98fb1cc07 100755
--- a/version/version.go
+++ b/version/version.go
@@ -4,12 +4,12 @@ package version
 const (
 	Maj = "0"
 	Min = "8"
-	Fix = "0"
+	Fix = "1"
 )
 
 var (
 	// Must be a string because scripts like dist.sh read this file.
-	Version = "0.8.0"
+	Version = "0.8.1"
 
 	// GitCommit is the current HEAD set using ldflags.
 	GitCommit string