diff --git a/core-test/src/test/scala/org/bitcoins/core/crypto/ECDigitalSignatureTest.scala b/core-test/src/test/scala/org/bitcoins/core/crypto/ECDigitalSignatureTest.scala
index 7ba1c47e13..f9e6c47e01 100644
--- a/core-test/src/test/scala/org/bitcoins/core/crypto/ECDigitalSignatureTest.scala
+++ b/core-test/src/test/scala/org/bitcoins/core/crypto/ECDigitalSignatureTest.scala
@@ -61,8 +61,7 @@ class ECDigitalSignatureTest extends BitcoinSUnitTest {
   }
 
   it must "must create and verify a digital signature" in {
-    forAll(CryptoGenerators.doubleSha256Digest,
-      CryptoGenerators.privateKey) {
+    forAll(CryptoGenerators.doubleSha256Digest, CryptoGenerators.privateKey) {
       case (hash, key) =>
         val sig = key.sign(hash)
         assert(key.publicKey.verify(hash, sig))
@@ -71,8 +70,8 @@ class ECDigitalSignatureTest extends BitcoinSUnitTest {
 
   it must "must not reuse r values" in {
     forAll(CryptoGenerators.privateKey,
-      CryptoGenerators.doubleSha256Digest,
-      CryptoGenerators.doubleSha256Digest) {
+           CryptoGenerators.doubleSha256Digest,
+           CryptoGenerators.doubleSha256Digest) {
       case (key, hash1, hash2) =>
         val sig1 = key.sign(hash1)
         val sig2 = key.sign(hash2)
@@ -99,4 +98,14 @@ class ECDigitalSignatureTest extends BitcoinSUnitTest {
     }
   }
 
+  it must "be able to generate valid signatures with bouncy castle" in {
+    forAll(CryptoGenerators.privateKey, CryptoGenerators.sha256Digest) {
+      case (privKey: ECPrivateKey, hash: Sha256Digest) =>
+        val sig = privKey.signWithBouncyCastle(hash.bytes)
+        val pubKey = privKey.publicKey
+
+        assert(pubKey.verify(hash, sig))
+    }
+  }
+
 }
diff --git a/core-test/src/test/scala/org/bitcoins/core/crypto/SignTest.scala b/core-test/src/test/scala/org/bitcoins/core/crypto/SignTest.scala
new file mode 100644
index 0000000000..573a118924
--- /dev/null
+++ b/core-test/src/test/scala/org/bitcoins/core/crypto/SignTest.scala
@@ -0,0 +1,36 @@
+package org.bitcoins.core.crypto
+
+import org.bitcoins.core.gen.CryptoGenerators
+import org.bitcoins.core.util.BitcoinSUnitTest
+import scodec.bits.ByteVector
+
+import scala.concurrent.{ExecutionContext, Future}
+
+class SignTest extends BitcoinSUnitTest {
+  implicit val ec = ExecutionContext.global
+
+  //ECPrivateKey implements the sign interface
+  //so just use it for testing purposes
+  val signTestImpl = new Sign {
+    private val key = ECPrivateKey.freshPrivateKey
+    override def signFunction: ByteVector => Future[ECDigitalSignature] = {
+      key.signFunction
+    }
+
+    override def publicKey: ECPublicKey = key.publicKey
+  }
+
+  behavior of "Sign"
+
+  it must "sign arbitrary pieces of data correctly" in {
+    forAll(CryptoGenerators.sha256Digest) {
+      case hash: Sha256Digest =>
+        val pubKey = signTestImpl.publicKey
+        val sigF = signTestImpl.signFunction(hash.bytes)
+
+        sigF.map(sig => assert(pubKey.verify(hash.hex, sig)))
+
+    }
+  }
+
+}
diff --git a/core/src/main/scala/org/bitcoins/core/crypto/ECKey.scala b/core/src/main/scala/org/bitcoins/core/crypto/ECKey.scala
index ce299cba51..0078e9d040 100644
--- a/core/src/main/scala/org/bitcoins/core/crypto/ECKey.scala
+++ b/core/src/main/scala/org/bitcoins/core/crypto/ECKey.scala
@@ -62,15 +62,11 @@ sealed abstract class BaseECKey extends NetworkElement with Sign {
       implicit ec: ExecutionContext): Future[ECDigitalSignature] =
     Future(sign(hash))
 
-  @deprecated("Deprecated in favor of signing algorithm inside of secp256k1",
-              "2/20/2017")
-  private def oldSign(
-      dataToSign: ByteVector,
-      signingKey: BaseECKey): ECDigitalSignature = {
+  def signWithBouncyCastle(dataToSign: ByteVector): ECDigitalSignature = {
     val signer: ECDSASigner = new ECDSASigner(
       new HMacDSAKCalculator(new SHA256Digest()))
     val privKey: ECPrivateKeyParameters = new ECPrivateKeyParameters(
-      new BigInteger(1, signingKey.bytes.toArray),
+      new BigInteger(1, bytes.toArray),
       CryptoParams.curve)
     signer.init(true, privKey)
     val components: Array[BigInteger] =
@@ -136,9 +132,8 @@ object ECPrivateKey extends Factory[ECPrivateKey] {
       isCompressed: Boolean,
       ec: ExecutionContext)
       extends ECPrivateKey {
-    require(
-      NativeSecp256k1.secKeyVerify(bytes.toArray),
-      s"Invalid key according to secp256k1, hex: ${bytes.toHex}")
+    require(NativeSecp256k1.secKeyVerify(bytes.toArray),
+            s"Invalid key according to secp256k1, hex: ${bytes.toHex}")
   }
 
   def apply(bytes: ByteVector, isCompressed: Boolean)(