diff --git a/.gitignore b/.gitignore
index 7ec88ce..30226da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,6 @@ target
 build
 Cargo.lock
 *.h
-main
 /local.properties
 .gradle
 wallet_db
diff --git a/jvm/src/main/java/org/bitcoindevkit/bdkjni/Lib.kt b/jvm/src/main/java/org/bitcoindevkit/bdkjni/Lib.kt
new file mode 100644
index 0000000..d1b7456
--- /dev/null
+++ b/jvm/src/main/java/org/bitcoindevkit/bdkjni/Lib.kt
@@ -0,0 +1,76 @@
+package org.bitcoindevkit.bdkjni
+
+import com.sun.jna.*
+import com.sun.jna.ptr.PointerByReference
+
+// typedef struct {
+//
+//    char * name;
+//
+//    int32_t count;
+//
+// } Config_t;
+//@Structure.FieldOrder("x", "y")
+class Config_t : Structure() {
+    @JvmField
+    var name: String? = null
+    @JvmField
+    var count: NativeLong? = null
+
+    override fun getFieldOrder() = listOf("name", "count")
+}
+
+// typedef struct WalletPtr WalletPtr_t;
+//class WalletPtr_t : PointerType()
+
+interface Lib : Library {
+
+    // void print_string (
+    //    char const * string);
+    fun print_string(name: String)
+
+    // char * concat_string (
+    //    char const * fst,
+    //    char const * snd);
+    fun concat_string(fst: String, snd: String): String
+
+    // void free_string (
+    //    char * string);
+    fun free_string(string: String)
+
+    // void print_int (
+    //    int64_t number);
+    fun print_int(number: Int)
+
+    // void print_config (
+    //    Config_t const * config);
+    fun print_config(config: Config_t)
+
+    // Config_t new_config (
+    //    char * name,
+    //    int32_t count);
+    fun new_config(name: String, count: NativeLong): Config_t
+
+    // void free_config (
+    //    Config_t * config);
+    fun free_config(config: Config_t)
+
+    // WalletPtr_t * new_wallet (
+    //    char const * name,
+    //    char const * descriptor,
+    //    char const * change_descriptor);
+    //fun new_wallet(name: String, descriptor: String, changeDescriptor: String?): WalletPtr_t
+
+    // void sync_wallet (
+    //    WalletPtr_t * const * wallet);
+    //fun sync_wallet(wallet: WalletPtr_t) 
+    //fun sync_wallet(wallet: WalletPtr_t)
+
+    // char * new_address (
+    //    WalletPtr_t * const * wallet);
+    //fun new_address(wallet: WalletPtr_t): String
+
+    // void free_wallet (
+    //    WalletPtr_t * wallet);
+    //fun free_wallet(wallet: WalletPtr_t)
+}
diff --git a/jvm/src/test/java/org/bitcoindevkit/bdkjni/LibTest.kt b/jvm/src/test/java/org/bitcoindevkit/bdkjni/LibTest.kt
index aef6e69..6d935fe 100644
--- a/jvm/src/test/java/org/bitcoindevkit/bdkjni/LibTest.kt
+++ b/jvm/src/test/java/org/bitcoindevkit/bdkjni/LibTest.kt
@@ -2,6 +2,8 @@ package org.bitcoindevkit.bdkjni
 
 import com.sun.jna.Native
 import com.sun.jna.NativeLong
+import com.sun.jna.Pointer
+import com.sun.jna.ptr.PointerByReference
 import org.junit.Test
 
 /**
@@ -40,4 +42,27 @@ class LibTest {
         lib.print_config(config)
         lib.free_config(config)
     }
+
+//    @Test
+//    fun new_sync_free_wallet() {
+//        val name = "test_wallet"
+//        val desc = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)"
+//        val change = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)"
+//        
+//        val wallet = lib.new_wallet(name, desc, change)
+//        println("wallet created in kotlin: $wallet")
+//        lib.sync_wallet(wallet)
+//        //lib.free_wallet(wallet)
+//    }
+
+//    @Test
+//    fun new_newaddress_wallet() {
+//        val name = "test_wallet"
+//        val desc = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)"
+//        val change = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)"
+//
+//        val config = lib.new_config("test test", NativeLong(Long.MAX_VALUE))
+//        lib.print_config(config)
+//        lib.free_config(config)
+//    }
 }