diff --git a/build.sbt b/build.sbt
index 8e58a05..b98c5f9 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,12 +1,19 @@
+import org.apache.ivy.core.module.descriptor.ExcludeRule
+
 name := "encry-common"
-version := "0.9.0"
+version := "0.9.1"
 scalaVersion := "2.12.6"
 organization := "org.encry"
 
 val circeVersion = "0.9.3"
 
+val excludeRule = ExclusionRule("ove")
+
+lazy val root = project.in(file(".")).dependsOn(blake2b)
+lazy val blake2b = ProjectRef(uri("git://github.com/alphazero/Blake2b.git#master"), "blake2b")
+
 libraryDependencies ++= Seq(
-  "org.encry"            %% "prism"           % "0.8.5",
+  ("org.encry"            %% "prism"           % "0.8.6").excludeAll(excludeRule),
   "io.circe"             %% "circe-core"      % circeVersion,
   "io.circe"             %% "circe-generic"   % circeVersion,
   "io.circe"             %% "circe-parser"    % circeVersion,
diff --git a/project/build.properties b/project/build.properties
index 84d4f68..a723771 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version = 1.2.0
\ No newline at end of file
+sbt.version = 1.3.0
\ No newline at end of file
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/ModifierWithDigest.scala b/src/main/scala/org/encryfoundation/common/modifiers/ModifierWithDigest.scala
index 042c076..a864bc8 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/ModifierWithDigest.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/ModifierWithDigest.scala
@@ -1,18 +1,13 @@
 package org.encryfoundation.common.modifiers
 
-import org.encryfoundation.common.utils.Algos
 import org.encryfoundation.common.utils.TaggedTypes.{ModifierId, ModifierTypeId}
+import org.encryfoundation.prismlang.utils.{BouncyCastleHasher, Hasher}
 
-trait ModifierWithDigest extends PersistentNodeViewModifier {
+trait ModifierWithDigest extends PersistentNodeViewModifier with BouncyCastleHasher {
 
-  override lazy val id: ModifierId = ModifierWithDigest.computeId(modifierTypeId, headerId, digest)
+  override lazy val id: ModifierId = ModifierId @@ prefixedHash(modifierTypeId, headerId, digest).repr
 
   def digest: Array[Byte]
 
   def headerId: Array[Byte]
-}
-
-object ModifierWithDigest {
-  def computeId(modifierType: ModifierTypeId, headerId: Array[Byte], digest: Array[Byte]): ModifierId =
-    ModifierId @@ Algos.hash.prefixedHash(modifierType, headerId, digest).repr
-}
+}
\ No newline at end of file
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/history/Header.scala b/src/main/scala/org/encryfoundation/common/modifiers/history/Header.scala
index 6936246..5ac0906 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/history/Header.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/history/Header.scala
@@ -11,10 +11,12 @@ import org.encryfoundation.common.utils.TaggedTypes.{ADDigest, Difficulty, Modif
 import scorex.crypto.hash.Digest32
 import io.circe.{Decoder, Encoder, HCursor}
 import io.circe.syntax._
+
 import scala.util.Try
 import Header._
 import org.encryfoundation.common.utils.constants.TestNetConstants
 import org.encryfoundation.common.utils.Algos
+import org.encryfoundation.prismlang.utils.BouncyCastleHasher
 
 case class Header(version: Byte,
                   override val parentId: ModifierId,
@@ -23,7 +25,7 @@ case class Header(version: Byte,
                   height: Int,
                   nonce: Long,
                   difficulty: Difficulty,
-                  equihashSolution: EquihashSolution) extends PersistentModifier {
+                  equihashSolution: EquihashSolution) extends PersistentModifier with BouncyCastleHasher {
 
   override type M = Header
 
@@ -38,7 +40,10 @@ case class Header(version: Byte,
   lazy val isGenesis: Boolean = height == TestNetConstants.GenesisHeight
 
   lazy val payloadId: ModifierId =
-    ModifierWithDigest.computeId(Payload.modifierTypeId, id, transactionsRoot)
+    computeId(Payload.modifierTypeId, id, transactionsRoot)
+
+  def computeId(modifierType: ModifierTypeId, headerId: Array[Byte], digest: Array[Byte]): ModifierId =
+    ModifierId @@ prefixedHash(modifierType, headerId, digest).repr
 
   def toHeaderProto: HeaderProtoMessage = HeaderProtoSerializer.toProto(this)
 
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/history/Payload.scala b/src/main/scala/org/encryfoundation/common/modifiers/history/Payload.scala
index 20bad8a..d1b2a29 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/history/Payload.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/history/Payload.scala
@@ -9,9 +9,13 @@ import org.apache.commons.lang.ArrayUtils
 import org.encryfoundation.common.modifiers.mempool.transaction.{Transaction, TransactionProtoSerializer, TransactionSerializer}
 import org.encryfoundation.common.modifiers.{ModifierWithDigest, PersistentModifier}
 import org.encryfoundation.common.serialization.Serializer
+import org.encryfoundation.common.utils.Algos.emptyMerkleTreeRoot
 import org.encryfoundation.common.utils.{Algos, TaggedTypes}
-import org.encryfoundation.common.utils.TaggedTypes.{LeafData, ModifierId, ModifierTypeId}
+import org.encryfoundation.common.utils.TaggedTypes.{ModifierId, ModifierTypeId}
+import scorex.crypto.authds.{LeafData => ScorexLeaf}
+import scorex.crypto.authds.merkle.MerkleTree
 import scorex.crypto.hash.Digest32
+
 import scala.util.{Success, Try}
 
 case class Payload(override val headerId: ModifierId,
@@ -23,7 +27,7 @@ case class Payload(override val headerId: ModifierId,
 
   override val modifierTypeId: ModifierTypeId = Payload.modifierTypeId
 
-  override lazy val digest: Digest32 = Payload.rootHash(txs.map(_.id))
+  override lazy val digest: Digest32 = rootHash(txs.map(_.id))
 
   override def serializer: Serializer[Payload] = PayloadSerializer
 
@@ -33,10 +37,20 @@ case class Payload(override val headerId: ModifierId,
     s" txsQty=${txs.size}, id = ${Algos.encode(id)})"
 
   override def parentId: ModifierId = null
+
+  def rootHash(ids: Seq[ModifierId]): Digest32 = merkleTreeRoot(ScorexLeaf !@@ ids)
+
+  def merkleTreeRoot(elements: Seq[ScorexLeaf]): Digest32 =
+    if (elements.isEmpty) emptyMerkleTreeRoot else MerkleTree(elements.map(ScorexLeaf @@ _.repr))(this).rootHash
 }
 
 object Payload {
 
+  def rootHash(ids: Seq[ModifierId]): Digest32 = merkleTreeRoot(ScorexLeaf !@@ ids) //for tests only
+
+  def merkleTreeRoot(elements: Seq[ScorexLeaf]): Digest32 =
+    if (elements.isEmpty) emptyMerkleTreeRoot else MerkleTree(elements.map(ScorexLeaf @@ _.repr))(Algos.hash).rootHash
+
   implicit val jsonEncoder: Encoder[Payload] = (p: Payload) => Map(
     "headerId"     -> Algos.encode(p.headerId).asJson,
     "transactions" -> p.txs.map(_.asJson).asJson
@@ -51,9 +65,6 @@ object Payload {
   )
 
   val modifierTypeId: ModifierTypeId = ModifierTypeId @@ (102: Byte)
-
-  def rootHash(ids: Seq[ModifierId]): Digest32 = Algos.merkleTreeRoot(LeafData !@@ ids)
-
 }
 
 object PayloadProtoSerializer {
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/AssetIssuingDirective.scala b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/AssetIssuingDirective.scala
index a0bf6b5..8697287 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/AssetIssuingDirective.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/AssetIssuingDirective.scala
@@ -26,9 +26,9 @@ case class AssetIssuingDirective(contractHash: ContractHash, amount: Amount) ext
 
   override def boxes(digest: Digest32, idx: Int): Seq[EncryBaseBox] = Seq(TokenIssuingBox(
     EncryProposition(contractHash),
-    Utils.nonceFromDigest(digest ++ Ints.toByteArray(idx)),
+    nonceFromDigest(digest ++ Ints.toByteArray(idx)),
     amount,
-    Algos.hash(Ints.toByteArray(idx) ++ digest)
+    blake2b.digest(Ints.toByteArray(idx) ++ digest)
   ))
 
   override def serializer: Serializer[M] = AssetIssuingDirectiveSerializer
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/DataDirective.scala b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/DataDirective.scala
index d8733d7..09949bd 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/DataDirective.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/DataDirective.scala
@@ -25,7 +25,7 @@ case class DataDirective(contractHash: ContractHash, data: Array[Byte]) extends
   override lazy val isValid: Boolean = data.length <= TestNetConstants.MaxDataLength
 
   override def boxes(digest: Digest32, idx: Int): Seq[EncryBaseBox] =
-    Seq(DataBox(EncryProposition(contractHash), Utils.nonceFromDigest(digest ++ Ints.toByteArray(idx)), data))
+    Seq(DataBox(EncryProposition(contractHash), nonceFromDigest(digest ++ Ints.toByteArray(idx)), data))
 
   override def serializer: Serializer[M] = DataDirectiveSerializer
 
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/Directive.scala b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/Directive.scala
index becd917..b71a73c 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/Directive.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/Directive.scala
@@ -1,13 +1,15 @@
 package org.encryfoundation.common.modifiers.mempool.directive
 
 import TransactionProto.TransactionProtoMessage.DirectiveProtoMessage
+import com.google.common.primitives.Longs
 import io.circe._
 import org.encryfoundation.common.modifiers.mempool.directive.Directive.DTypeId
 import org.encryfoundation.common.modifiers.state.box.EncryBaseBox
 import org.encryfoundation.common.serialization.BytesSerializable
+import org.encryfoundation.prismlang.utils.Hasher
 import scorex.crypto.hash.Digest32
 
-trait Directive extends BytesSerializable {
+trait Directive extends BytesSerializable with Hasher {
 
   val typeId: DTypeId
 
@@ -16,6 +18,8 @@ trait Directive extends BytesSerializable {
   def boxes(digest: Digest32, idx: Int): Seq[EncryBaseBox]
 
   def toDirectiveProto: DirectiveProtoMessage
+
+  def nonceFromDigest(digest: Array[Byte]): Long = Longs.fromByteArray(blake2b.digest(digest).take(8))
 }
 
 object Directive {
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/ScriptedAssetDirective.scala b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/ScriptedAssetDirective.scala
index ec25d61..168bdce 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/ScriptedAssetDirective.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/ScriptedAssetDirective.scala
@@ -29,7 +29,7 @@ case class ScriptedAssetDirective(contractHash: ContractHash,
   override lazy val isValid: Boolean = amount > 0
 
   override def boxes(digest: Digest32, idx: Int): Seq[EncryBaseBox] =
-    Seq(AssetBox(EncryProposition(contractHash), Utils.nonceFromDigest(digest ++ Ints.toByteArray(idx)), amount))
+    Seq(AssetBox(EncryProposition(contractHash), nonceFromDigest(digest ++ Ints.toByteArray(idx)), amount))
 
   override def serializer: Serializer[M] = ScriptedAssetDirectiveSerializer
 
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/TransferDirective.scala b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/TransferDirective.scala
index f54e0b7..26d7d93 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/TransferDirective.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/mempool/directive/TransferDirective.scala
@@ -32,7 +32,7 @@ case class TransferDirective(address: Address,
 
   override def boxes(digest: Digest32, idx: Int): Seq[EncryBaseBox] =
     Seq(AssetBox(EncryProposition.addressLocked(address),
-      Utils.nonceFromDigest(digest ++ Ints.toByteArray(idx)), amount, tokenIdOpt))
+      nonceFromDigest(digest ++ Ints.toByteArray(idx)), amount, tokenIdOpt))
 
   override def serializer: Serializer[M] = TransferDirectiveSerializer
 
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/mempool/transaction/Transaction.scala b/src/main/scala/org/encryfoundation/common/modifiers/mempool/transaction/Transaction.scala
index 5104ad2..b979bb0 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/mempool/transaction/Transaction.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/mempool/transaction/Transaction.scala
@@ -21,12 +21,14 @@ import org.encryfoundation.common.utils.TaggedTypes.{ModifierId, ModifierTypeId}
 import org.encryfoundation.common.utils.constants.TestNetConstants
 import org.encryfoundation.common.validation.{ModifierValidator, ValidationResult}
 import org.encryfoundation.prismlang.core.wrapped.{PObject, PValue}
+import org.encryfoundation.prismlang.utils.Hasher
 
 case class Transaction(fee: Amount,
                        timestamp: Long,
                        inputs: IndexedSeq[Input],
                        directives: IndexedSeq[Directive],
-                       defaultProofOpt: Option[Proof]) extends NodeViewModifier with ModifierValidator with PConvertible {
+                       defaultProofOpt: Option[Proof])
+  extends NodeViewModifier with ModifierValidator with PConvertible with Hasher with BytesToSign {
 
   override val modifierTypeId: ModifierTypeId = Transaction.modifierTypeId
 
@@ -36,9 +38,9 @@ case class Transaction(fee: Amount,
 
   def toTransactionProto: TransactionProtoMessage = TransactionProtoSerializer.toProto(this)
 
-  val messageToSign: Array[Byte] = UnsignedTransaction.bytesToSign(fee, timestamp, inputs, directives)
+  val messageToSign: Array[Byte] = bytesToSign(fee, timestamp, inputs, directives)
 
-  val id: ModifierId = ModifierId !@@ Algos.hash(messageToSign)
+  val id: ModifierId = ModifierId !@@ blake2b.digest(messageToSign)
 
   val size: Int = this.bytes.length
 
@@ -182,9 +184,9 @@ object TransactionSerializer extends Serializer[Transaction] {
 case class UnsignedTransaction(fee: Amount,
                                timestamp: Long,
                                inputs: IndexedSeq[Input],
-                               directives: IndexedSeq[Directive]) {
+                               directives: IndexedSeq[Directive]) extends BytesToSign with Hasher {
 
-  val messageToSign: Array[Byte] = UnsignedTransaction.bytesToSign(fee, timestamp, inputs, directives)
+  val messageToSign: Array[Byte] = bytesToSign(fee, timestamp, inputs, directives)
 
   def toSigned(proofs: IndexedSeq[Seq[Proof]], defaultProofOpt: Option[Proof]): Transaction = {
     val signedInputs: IndexedSeq[Input] = inputs.zipWithIndex.map { case (input, idx) =>
@@ -194,13 +196,14 @@ case class UnsignedTransaction(fee: Amount,
   }
 }
 
-object UnsignedTransaction {
+trait BytesToSign {
+  this: Hasher =>
 
   def bytesToSign(fee: Amount,
                   timestamp: Long,
                   unlockers: IndexedSeq[Input],
                   directives: IndexedSeq[Directive]): Digest32 =
-    Algos.hash(Bytes.concat(
+    Digest32 @@ blake2b.digest(Bytes.concat(
       unlockers.map(_.bytesWithoutProof).foldLeft(Array[Byte]())(_ ++ _),
       directives.map(_.bytes).foldLeft(Array[Byte]())(_ ++ _),
       Longs.toByteArray(timestamp),
diff --git a/src/main/scala/org/encryfoundation/common/modifiers/state/box/EncryBaseBox.scala b/src/main/scala/org/encryfoundation/common/modifiers/state/box/EncryBaseBox.scala
index b404686..4538171 100644
--- a/src/main/scala/org/encryfoundation/common/modifiers/state/box/EncryBaseBox.scala
+++ b/src/main/scala/org/encryfoundation/common/modifiers/state/box/EncryBaseBox.scala
@@ -4,13 +4,14 @@ import BoxesProto.BoxProtoMessage
 import com.google.common.primitives.Longs
 import io.circe.{Decoder, DecodingFailure, Encoder}
 import org.encryfoundation.common.modifiers.state.box.EncryBox.BxTypeId
-import org.encryfoundation.common.utils.Algos
 import org.encryfoundation.common.utils.TaggedTypes.ADKey
 import org.encryfoundation.prismlang.core.wrapped.{PObject, PValue}
 import org.encryfoundation.prismlang.core.{PConvertible, Types}
+import org.encryfoundation.prismlang.utils.Hasher
+
 import scala.util.Try
 
-trait EncryBaseBox extends Box[EncryProposition] with PConvertible {
+trait EncryBaseBox extends Box[EncryProposition] with PConvertible with Hasher {
 
   val typeId: BxTypeId
 
@@ -18,7 +19,7 @@ trait EncryBaseBox extends Box[EncryProposition] with PConvertible {
 
   def serializeToProto: BoxProtoMessage
 
-  override lazy val id: ADKey = ADKey @@ Algos.hash(Longs.toByteArray(nonce)).updated(0, typeId)
+  override lazy val id: ADKey = ADKey @@ blake2b.digest(Longs.toByteArray(nonce)).updated(0, typeId)
 
   def isAmountCarrying: Boolean = this.isInstanceOf[MonetaryBox]
 
diff --git a/src/main/scala/org/encryfoundation/common/utils/Algos.scala b/src/main/scala/org/encryfoundation/common/utils/Algos.scala
index f83b23e..a2a981c 100644
--- a/src/main/scala/org/encryfoundation/common/utils/Algos.scala
+++ b/src/main/scala/org/encryfoundation/common/utils/Algos.scala
@@ -2,10 +2,8 @@ package org.encryfoundation.common.utils
 
 import java.nio.charset.Charset
 import org.encryfoundation.common.utils.TaggedTypes.LeafData
-import scorex.crypto.authds.merkle.MerkleTree
 import scorex.crypto.encode.Base16
 import scorex.crypto.hash.{Blake2b256, Digest32}
-import scorex.crypto.authds.{LeafData => ScorexLeaf}
 import scala.util.Try
 
 object Algos {
@@ -22,8 +20,5 @@ object Algos {
 
   val charset: Charset = Charset.defaultCharset()
 
-  def merkleTreeRoot(elements: Seq[LeafData]): Digest32 =
-    if (elements.isEmpty) emptyMerkleTreeRoot else MerkleTree(elements.map(ScorexLeaf @@ _.repr))(hash).rootHash
-
   lazy val emptyMerkleTreeRoot: Digest32 = Algos.hash(LeafData @@ Array[Byte]())
 }
\ No newline at end of file
diff --git a/src/main/scala/org/encryfoundation/common/utils/Utils.scala b/src/main/scala/org/encryfoundation/common/utils/Utils.scala
index 3e31f50..d4fc2e7 100644
--- a/src/main/scala/org/encryfoundation/common/utils/Utils.scala
+++ b/src/main/scala/org/encryfoundation/common/utils/Utils.scala
@@ -1,7 +1,6 @@
 package org.encryfoundation.common.utils
 
 import java.nio.{ByteBuffer, ByteOrder}
-import com.google.common.primitives.Longs
 import org.bouncycastle.crypto.Digest
 
 object Utils {
@@ -32,6 +31,4 @@ object Utils {
   }
 
   def validateSolution(solution: Array[Byte], target: Double): Boolean = countLeadingZeroes(solution) >= target
-
-  def nonceFromDigest(digest: Array[Byte]): Long = Longs.fromByteArray(Algos.hash(digest).take(8))
 }
\ No newline at end of file