diff --git a/Package.swift b/Package.swift
index cf042c1..4bb46da 100644
--- a/Package.swift
+++ b/Package.swift
@@ -9,7 +9,10 @@ let package = Package(
         // Products define the executables and libraries produced by a package, and make them visible to other packages.
         .library(
             name: "BeaconChain",
-            targets: ["BeaconChain"])
+            targets: ["BeaconChain"]),
+        .executable(
+            name: "Node",
+            targets: ["Node"])
     ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
@@ -21,8 +24,14 @@ let package = Package(
         .target(
             name: "BeaconChain",
             dependencies: []),
+        .target(
+            name: "Node",
+            dependencies: ["BeaconChain"]),
         .testTarget(
             name: "BeaconChainTests",
-            dependencies: ["BeaconChain"])
+            dependencies: ["BeaconChain"]),
+        .testTarget(
+            name: "NodeTests",
+            dependencies: ["Node"])
     ]
 )
diff --git a/Sources/BeaconChain/DataStructures/Blocks/BeaconBlock.swift b/Sources/BeaconChain/DataStructures/Blocks/BeaconBlock.swift
index 5ad56d9..01903cc 100644
--- a/Sources/BeaconChain/DataStructures/Blocks/BeaconBlock.swift
+++ b/Sources/BeaconChain/DataStructures/Blocks/BeaconBlock.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-struct BeaconBlock: Equatable {
+public struct BeaconBlock: Equatable {
     let slot: UInt64
     let parentRoot: Data
     let stateRoot: Data
diff --git a/Sources/BeaconChain/DataStructures/Transactions/Attestations/Attestation.swift b/Sources/BeaconChain/DataStructures/Transactions/Attestations/Attestation.swift
index 42fe2a7..3ddf7ac 100644
--- a/Sources/BeaconChain/DataStructures/Transactions/Attestations/Attestation.swift
+++ b/Sources/BeaconChain/DataStructures/Transactions/Attestations/Attestation.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-struct Attestation: Equatable {
+public struct Attestation: Equatable {
     let aggregationBitfield: Data
     let data: AttestationData
     let custodyBitfield: Data
diff --git a/Sources/BeaconChain/Store/Store.swift b/Sources/BeaconChain/Store/Store.swift
index 199cfb5..baba99f 100644
--- a/Sources/BeaconChain/Store/Store.swift
+++ b/Sources/BeaconChain/Store/Store.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-protocol Store {
+public protocol Store {
 
     func parent(_ block: BeaconBlock) -> BeaconBlock
     func children(_ block: BeaconBlock) -> [BeaconBlock]
diff --git a/Sources/BeaconChain/Types.swift b/Sources/BeaconChain/Types.swift
index 7e02de6..e57221f 100644
--- a/Sources/BeaconChain/Types.swift
+++ b/Sources/BeaconChain/Types.swift
@@ -3,7 +3,7 @@ import Foundation
 typealias Slot = UInt64
 typealias Epoch = UInt64
 typealias Shard = UInt64
-typealias ValidatorIndex = UInt64
+public typealias ValidatorIndex = UInt64
 typealias Gwei = UInt64
 typealias Bytes32 = Data // @todo needs to be 32 fixed length data
 typealias BLSPubkey = Data // @todo needs to be 48 fixed length data
diff --git a/Sources/Node/Store/TestStore.swift b/Sources/Node/Store/TestStore.swift
new file mode 100644
index 0000000..1d0f7e4
--- /dev/null
+++ b/Sources/Node/Store/TestStore.swift
@@ -0,0 +1,19 @@
+import BeaconChain
+
+class TestStore: Store {
+    func parent(_ block: BeaconBlock) -> BeaconBlock {
+
+    }
+
+    func children(_ block: BeaconBlock) -> [BeaconBlock] {
+
+    }
+
+    func latestAttestation(validator: ValidatorIndex) -> Attestation {
+
+    }
+
+    func latestAttestationTarget(validator: ValidatorIndex) -> BeaconBlock {
+
+    }
+}
diff --git a/Sources/Node/main.swift b/Sources/Node/main.swift
new file mode 100644
index 0000000..fbf2875
--- /dev/null
+++ b/Sources/Node/main.swift
@@ -0,0 +1,2 @@
+import Foundation
+
diff --git a/Tests/NodeTests/XCTestManifests.swift b/Tests/NodeTests/XCTestManifests.swift
new file mode 100644
index 0000000..f9ce505
--- /dev/null
+++ b/Tests/NodeTests/XCTestManifests.swift
@@ -0,0 +1,8 @@
+import XCTest
+
+#if !os(macOS)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+    ]
+}
+#endif