diff --git a/bchain/coins/btc/bitcoinparser.go b/bchain/coins/btc/bitcoinparser.go
index 415082a2..692d1170 100644
--- a/bchain/coins/btc/bitcoinparser.go
+++ b/bchain/coins/btc/bitcoinparser.go
@@ -41,8 +41,8 @@ func (p *BitcoinBlockParser) GetUIDFromAddress(address string) ([]byte, error) {
 	return p.AddressToOutputScript(address)
 }
 
-func (p *BitcoinBlockParser) PackUID(script string) ([]byte, error) {
-	return hex.DecodeString(script)
+func (p *BitcoinBlockParser) PackUID(str string) ([]byte, error) {
+	return hex.DecodeString(str)
 }
 
 func (p *BitcoinBlockParser) UnpackUID(buf []byte) string {
diff --git a/bchain/coins/btc/bitcoinrpc.go b/bchain/coins/btc/bitcoinrpc.go
index d57c94d2..ba4f62d5 100644
--- a/bchain/coins/btc/bitcoinrpc.go
+++ b/bchain/coins/btc/bitcoinrpc.go
@@ -24,7 +24,7 @@ type BitcoinRPC struct {
 	rpcURL      string
 	user        string
 	password    string
-	Parser      *BitcoinBlockParser
+	Parser      bchain.BlockChainParser
 	Testnet     bool
 	Network     string
 	Mempool     *bchain.Mempool
@@ -64,26 +64,6 @@ func NewBitcoinRPC(config json.RawMessage, pushHandler func(*bchain.MQMessage),
 		ParseBlocks: c.Parse,
 		metrics:     metrics,
 	}
-	chainName, err := s.GetBlockChainInfo()
-	if err != nil {
-		return nil, err
-	}
-
-	// always create parser
-	s.Parser = &BitcoinBlockParser{
-		Params: GetChainParams(chainName),
-	}
-
-	// parameters for getInfo request
-	if s.Parser.Params.Net == wire.MainNet {
-		s.Testnet = false
-		s.Network = "livenet"
-	} else {
-		s.Testnet = true
-		s.Network = "testnet"
-	}
-
-	glog.Info("rpc: block chain ", s.Parser.Params.Name)
 
 	mq, err := bchain.NewMQ(c.ZeroMQBinding, pushHandler)
 	if err != nil {
@@ -95,6 +75,35 @@ func NewBitcoinRPC(config json.RawMessage, pushHandler func(*bchain.MQMessage),
 	return s, nil
 }
 
+func (b *BitcoinRPC) Initialize(mempool *bchain.Mempool) error {
+	b.Mempool = mempool
+
+	chainName, err := b.GetBlockChainInfo()
+	if err != nil {
+		return err
+	}
+
+	params := GetChainParams(chainName)
+
+	// always create parser
+	b.Parser = &BitcoinBlockParser{
+		Params: params,
+	}
+
+	// parameters for getInfo request
+	if params.Net == wire.MainNet {
+		b.Testnet = false
+		b.Network = "livenet"
+	} else {
+		b.Testnet = true
+		b.Network = "testnet"
+	}
+
+	glog.Info("rpc: block chain ", params.Name)
+
+	return nil
+}
+
 func (b *BitcoinRPC) Shutdown() error {
 	if b.mq != nil {
 		if err := b.mq.Shutdown(); err != nil {
@@ -105,10 +114,6 @@ func (b *BitcoinRPC) Shutdown() error {
 	return nil
 }
 
-func (b *BitcoinRPC) Initialize(mempool *bchain.Mempool) {
-	b.Mempool = mempool
-}
-
 func (b *BitcoinRPC) IsTestnet() bool {
 	return b.Testnet
 }
diff --git a/bchain/coins/zec/zcashparser.go b/bchain/coins/zec/zcashparser.go
new file mode 100644
index 00000000..fab2b5ba
--- /dev/null
+++ b/bchain/coins/zec/zcashparser.go
@@ -0,0 +1,46 @@
+package zec
+
+import (
+	"blockbook/bchain"
+	"blockbook/bchain/coins/btc"
+
+	"github.com/btcsuite/btcd/chaincfg"
+)
+
+// bitcoinwire parsing
+
+type ZCashBlockParser struct {
+	btc.BitcoinBlockParser
+}
+
+// getChainParams contains network parameters for the main Bitcoin network,
+// the regression test Bitcoin network, the test Bitcoin network and
+// the simulation test Bitcoin network, in this order
+func GetChainParams(chain string) *chaincfg.Params {
+	switch chain {
+	case "test":
+		return &chaincfg.TestNet3Params
+	case "regtest":
+		return &chaincfg.RegressionNetParams
+	}
+	return &chaincfg.MainNetParams
+}
+
+func (p *ZCashBlockParser) GetUIDFromVout(output *bchain.Vout) string {
+	if len(output.ScriptPubKey.Addresses) != 1 {
+		return ""
+	}
+	return output.ScriptPubKey.Addresses[0]
+}
+
+func (p *ZCashBlockParser) GetUIDFromAddress(address string) ([]byte, error) {
+	return p.PackUID(address)
+}
+
+func (p *ZCashBlockParser) PackUID(str string) ([]byte, error) {
+	return []byte(str), nil
+}
+
+func (p *ZCashBlockParser) UnpackUID(buf []byte) string {
+	return string(buf)
+}
diff --git a/bchain/coins/zec/zcashrpc.go b/bchain/coins/zec/zcashrpc.go
index 743cf026..5f6dd539 100644
--- a/bchain/coins/zec/zcashrpc.go
+++ b/bchain/coins/zec/zcashrpc.go
@@ -6,6 +6,8 @@ import (
 	"blockbook/common"
 	"encoding/json"
 
+	"github.com/btcsuite/btcd/wire"
+
 	"github.com/golang/glog"
 	"github.com/juju/errors"
 )
@@ -25,6 +27,37 @@ func NewZCashRPC(config json.RawMessage, pushHandler func(*bchain.MQMessage), me
 	return z, nil
 }
 
+func (z *ZCashRPC) Initialize(mempool *bchain.Mempool) error {
+	z.Mempool = mempool
+
+	chainName, err := z.GetBlockChainInfo()
+	if err != nil {
+		return err
+	}
+
+	params := GetChainParams(chainName)
+
+	// always create parser
+	z.Parser = &ZCashBlockParser{
+		btc.BitcoinBlockParser{
+			Params: params,
+		},
+	}
+
+	// parameters for getInfo request
+	if params.Net == wire.MainNet {
+		z.Testnet = false
+		z.Network = "livenet"
+	} else {
+		z.Testnet = true
+		z.Network = "testnet"
+	}
+
+	glog.Info("rpc: block chain ", params.Name)
+
+	return nil
+}
+
 type untypedArrayParams struct {
 	Method string        `json:"method"`
 	Params []interface{} `json:"params"`
@@ -145,8 +178,3 @@ func (z *ZCashRPC) GetBlockHeader(hash string) (*bchain.BlockHeader, error) {
 	}
 	return &res.Result, nil
 }
-
-// GetChainParser returns BlockChainParser
-func (z *ZCashRPC) GetChainParser() bchain.BlockChainParser {
-	return z.Parser
-}
diff --git a/bchain/mempool.go b/bchain/mempool.go
index 37155fda..a37b6c93 100644
--- a/bchain/mempool.go
+++ b/bchain/mempool.go
@@ -27,7 +27,6 @@ type inputOutput struct {
 // Mempool is mempool handle.
 type Mempool struct {
 	chain           BlockChain
-	chainParser     BlockChainParser
 	mux             sync.Mutex
 	txToInputOutput map[string]inputOutput
 	scriptToTx      map[string][]outpoint // TODO rename all occurences
@@ -37,18 +36,19 @@ type Mempool struct {
 
 // NewMempool creates new mempool handler.
 func NewMempool(chain BlockChain, metrics *common.Metrics) *Mempool {
-	return &Mempool{chain: chain, chainParser: chain.GetChainParser(), metrics: metrics}
+	return &Mempool{chain: chain, metrics: metrics}
 }
 
 // GetTransactions returns slice of mempool transactions for given output script.
 func (m *Mempool) GetTransactions(address string) ([]string, error) {
 	m.mux.Lock()
 	defer m.mux.Unlock()
-	buf, err := m.chainParser.GetUIDFromAddress(address)
+	parser := m.chain.GetChainParser()
+	buf, err := parser.GetUIDFromAddress(address)
 	if err != nil {
 		return nil, err
 	}
-	outid := m.chainParser.UnpackUID(buf)
+	outid := parser.UnpackUID(buf)
 	outpoints := m.scriptToTx[outid]
 	txs := make([]string, 0, len(outpoints)+len(outpoints)/2)
 	for _, o := range outpoints {
@@ -86,6 +86,7 @@ func (m *Mempool) Resync(onNewTxAddr func(txid string, addr string)) error {
 		m.metrics.MempoolResyncErrors.With(common.Labels{"error": err.Error()}).Inc()
 		return err
 	}
+	parser := m.chain.GetChainParser()
 	newTxToInputOutput := make(map[string]inputOutput, len(m.txToInputOutput)+1)
 	newScriptToTx := make(map[string][]outpoint, len(m.scriptToTx)+1)
 	newInputs := make(map[outpoint]string, len(m.inputs)+1)
@@ -100,7 +101,7 @@ func (m *Mempool) Resync(onNewTxAddr func(txid string, addr string)) error {
 			}
 			io.outputs = make([]scriptIndex, 0, len(tx.Vout))
 			for _, output := range tx.Vout {
-				outid := m.chainParser.GetUIDFromVout(&output)
+				outid := parser.GetUIDFromVout(&output)
 				if outid != "" {
 					io.outputs = append(io.outputs, scriptIndex{outid, output.N})
 				}
diff --git a/bchain/types.go b/bchain/types.go
index 4d0d5e28..6e665364 100644
--- a/bchain/types.go
+++ b/bchain/types.go
@@ -87,7 +87,7 @@ func (e *RPCError) Error() string {
 
 type BlockChain interface {
 	// life-cycle methods
-	Initialize(mempool *Mempool)
+	Initialize(mempool *Mempool) error
 	Shutdown() error
 	// chain info
 	IsTestnet() bool
diff --git a/db/rocksdb.go b/db/rocksdb.go
index 43d01260..50ce4438 100644
--- a/db/rocksdb.go
+++ b/db/rocksdb.go
@@ -266,7 +266,7 @@ func (d *RocksDB) writeOutputs(wb *gorocksdb.WriteBatch, block *bchain.Block, op
 	for outid, outpoints := range records {
 		bOutid, err := d.chainParser.PackUID(outid)
 		if err != nil {
-			glog.Warningf("rocksdb: packOutputID: %v - %d %s", err, block.Height, outid)
+			glog.Warningf("rocksdb: packUID: %v - %d %s", err, block.Height, outid)
 			continue
 		}
 		key, err := packOutputKey(bOutid, block.Height)