diff --git a/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/BlockchainConfig.kt b/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/BlockchainConfig.kt
new file mode 100644
index 0000000..e604975
--- /dev/null
+++ b/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/BlockchainConfig.kt
@@ -0,0 +1,25 @@
+package org.bitcoindevkit.bdk
+
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+abstract class BlockchainConfig() : LibBase() {
+    private val log: Logger = LoggerFactory.getLogger(BlockchainConfig::class.java)
+    abstract val blockchainConfigT: LibJna.BlockchainConfig_t
+
+    protected fun finalize() {
+        libJna.free_blockchain_config(blockchainConfigT)
+        log.debug("$blockchainConfigT freed")
+    }
+}
+
+class ElectrumConfig(
+    url: String,
+    socks5: String?,
+    retry: Short,
+    timeout: Short
+) : BlockchainConfig() {
+
+    private val log: Logger = LoggerFactory.getLogger(ElectrumConfig::class.java)
+    override val blockchainConfigT = libJna.new_electrum_config(url, socks5, retry, timeout)
+}
\ No newline at end of file
diff --git a/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/DatabaseConfig.kt b/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/DatabaseConfig.kt
new file mode 100644
index 0000000..317965b
--- /dev/null
+++ b/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/DatabaseConfig.kt
@@ -0,0 +1,26 @@
+package org.bitcoindevkit.bdk
+
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+abstract class DatabaseConfig() : LibBase() {
+    private val log: Logger = LoggerFactory.getLogger(DatabaseConfig::class.java)
+    abstract val databaseConfigT: LibJna.DatabaseConfig_t
+
+    protected fun finalize() {
+        libJna.free_database_config(databaseConfigT)
+        log.debug("$databaseConfigT freed")
+    }
+}
+
+class MemoryConfig() : DatabaseConfig() {
+
+    private val log: Logger = LoggerFactory.getLogger(MemoryConfig::class.java)
+    override val databaseConfigT = libJna.new_memory_config()
+}
+
+class SledConfig(path: String, treeName:String) : DatabaseConfig() {
+
+    private val log: Logger = LoggerFactory.getLogger(SledConfig::class.java)
+    override val databaseConfigT = libJna.new_sled_config(path, treeName)
+}
\ No newline at end of file
diff --git a/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/LibJna.kt b/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/LibJna.kt
index c1de293..6e9d04b 100644
--- a/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/LibJna.kt
+++ b/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/LibJna.kt
@@ -48,6 +48,18 @@ interface LibJna : Library {
     //    WalletRef_t * wallet_ref);
     fun free_wallet_ref(wallet_ref: WalletRef_t)
 
+    // typedef struct BlockchainConfig BlockchainConfig_t;
+    class BlockchainConfig_t : PointerType {
+        constructor() : super()
+        constructor(pointer: Pointer) : super(pointer)
+    }
+
+    // typedef struct DatabaseConfig DatabaseConfig_t;
+    class DatabaseConfig_t : PointerType {
+        constructor() : super()
+        constructor(pointer: Pointer) : super(pointer)
+    }
+
     // typedef struct WalletResult WalletResult_t;
     class WalletResult_t : PointerType {
         constructor() : super()
@@ -55,13 +67,15 @@ interface LibJna : Library {
     }
 
     // WalletResult_t * new_wallet_result (
-    //    char const * name,
     //    char const * descriptor,
-    //    char const * change_descriptor);
+    //    char const * change_descriptor,
+    //    BlockchainConfig_t const * blockchain_config,
+    //    DatabaseConfig_t const * database_config);
     fun new_wallet_result(
-        name: String,
         descriptor: String,
-        changeDescriptor: String?
+        changeDescriptor: String?,
+        blockchainConfig: BlockchainConfig_t,
+        databaseConfig: DatabaseConfig_t,
     ): WalletResult_t
 
     // char * get_wallet_err (
@@ -87,4 +101,32 @@ interface LibJna : Library {
     // void free_string (
     //    char * string);
     fun free_string(string: Pointer?)
+
+    // BlockchainConfig_t * new_electrum_config (
+    //    char const * url,
+    //    char const * socks5,
+    //    int16_t retry,
+    //    int16_t timeout);
+    fun new_electrum_config(
+        url: String,
+        socks5: String?,
+        retry: Short,
+        timeout: Short
+    ): BlockchainConfig_t
+
+    // void free_blockchain_config (
+    //    BlockchainConfig_t * blockchain_config);
+    fun free_blockchain_config( blockchain_config: BlockchainConfig_t) 
+
+    // DatabaseConfig_t * new_memory_config (void);
+    fun new_memory_config(): DatabaseConfig_t
+    
+    // DatabaseConfig_t * new_sled_config (
+    //    char const * path,
+    //    char const * tree_name);
+    fun new_sled_config(path: String, tree_name: String): DatabaseConfig_t
+
+    // void free_database_config (
+    //    DatabaseConfig_t * database_config);
+    fun free_database_config( database_config: DatabaseConfig_t)
 }
diff --git a/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/Wallet.kt b/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/Wallet.kt
index 7b62e24..e2a8e12 100644
--- a/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/Wallet.kt
+++ b/bdk-kotlin/jvm/src/main/java/org/bitcoindevkit/bdk/Wallet.kt
@@ -4,15 +4,16 @@ import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 
 class Wallet constructor(
-    name: String,
     descriptor: String,
     changeDescriptor: String?,
+    blockchainConfig: BlockchainConfig,
+    databaseConfig: DatabaseConfig,
 ) : LibBase() {
 
     val log: Logger = LoggerFactory.getLogger(Wallet::class.java)
 
     private val walletResult =
-        WalletResult(libJna.new_wallet_result(name, descriptor, changeDescriptor))
+        WalletResult(libJna.new_wallet_result(descriptor, changeDescriptor, blockchainConfig.blockchainConfigT, databaseConfig.databaseConfigT))
     private val walletRefT = walletResult.value()
 
     fun sync() {
diff --git a/bdk-kotlin/test-fixtures/src/main/java/org/bitcoindevkit/bdk/LibTest.kt b/bdk-kotlin/test-fixtures/src/main/java/org/bitcoindevkit/bdk/LibTest.kt
index 70e70ec..60d02de 100644
--- a/bdk-kotlin/test-fixtures/src/main/java/org/bitcoindevkit/bdk/LibTest.kt
+++ b/bdk-kotlin/test-fixtures/src/main/java/org/bitcoindevkit/bdk/LibTest.kt
@@ -22,17 +22,21 @@ abstract class LibTest : LibBase() {
 
     @Test
     fun walletResultError() {
+        val blockchainConfig = ElectrumConfig("ssl://electrum.blockstream.info:60002", null, 5, 30)
+        val databaseConfig = MemoryConfig()
         val jnaException = assertThrows(JnaException::class.java) {
-            Wallet("bad", "bad", "bad")
+            Wallet("bad", "bad", blockchainConfig, databaseConfig)
         }
         assertEquals(jnaException.err, JnaError.Descriptor)
     }
 
     @Test
     fun walletResultFinalize() {
+        val blockchainConfig = ElectrumConfig("ssl://electrum.blockstream.info:60002", null, 5, 30)
+        val databaseConfig = MemoryConfig()
         val names = listOf("one", "two", "three")
         names.map {
-            val wallet = Wallet(it, desc, change)
+            val wallet = Wallet(desc, change, blockchainConfig, databaseConfig)
             assertNotNull(wallet)
         }
         System.gc()
@@ -41,14 +45,18 @@ abstract class LibTest : LibBase() {
 
     @Test
     fun walletSync() {
-        val wallet = Wallet(name, desc, change)
+        val blockchainConfig = ElectrumConfig("ssl://electrum.blockstream.info:60002", null, 5, 30)
+        val databaseConfig = MemoryConfig()
+        val wallet = Wallet(desc, change, blockchainConfig, databaseConfig)
         assertNotNull(wallet)
         wallet.sync()
     }
 
     @Test
     fun walletNewAddress() {
-        val wallet = Wallet(name, desc, change)
+        val blockchainConfig = ElectrumConfig("ssl://electrum.blockstream.info:60002", null, 5, 30)
+        val databaseConfig = MemoryConfig()
+        val wallet = Wallet(desc, change, blockchainConfig, databaseConfig)
         assertNotNull(wallet)
         val address = wallet.getAddress()
         assertNotNull(address)
diff --git a/cc/bdk_ffi_test.c b/cc/bdk_ffi_test.c
index cd01a7b..487b20f 100644
--- a/cc/bdk_ffi_test.c
+++ b/cc/bdk_ffi_test.c
@@ -8,8 +8,14 @@ int main (int argc, char const * const argv[])
 {   
     // test new wallet error
     { 
-        WalletResult_t *wallet_result = new_wallet_result("bad", "bad", NULL);
+        BlockchainConfig_t *bc_config = new_electrum_config("ssl://electrum.blockstream.info:60002", NULL, 5, 30);
+        //DatabaseConfig_t *db_config = new_sled_config("/home/steve/.bdk", "test_wallet");
+        DatabaseConfig_t *db_config = new_memory_config();
+        
+        WalletResult_t *wallet_result = new_wallet_result("bad", "bad", bc_config, db_config);
         assert(wallet_result != NULL);
+        free_blockchain_config(bc_config);
+        free_database_config(db_config);
         char *wallet_err = get_wallet_err(wallet_result);
         assert(wallet_err != NULL);
         assert( 0 == strcmp(wallet_err,"Descriptor") );
@@ -18,16 +24,22 @@ int main (int argc, char const * const argv[])
         assert(wallet_ref == NULL);
         free_string(wallet_err);
         free_wallet_result(wallet_result);
+
     }
     
     // test new wallet
     {
-        char const *name = "test_wallet";
         char const *desc = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)";
         char const *change = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)";
     
-        WalletResult_t *wallet_result = new_wallet_result(name, desc, change);
+        BlockchainConfig_t *bc_config = new_electrum_config("ssl://electrum.blockstream.info:60002", NULL, 5, 30);
+        //DatabaseConfig_t *db_config = new_sled_config("/home/steve/.bdk", "test_wallet");
+        DatabaseConfig_t *db_config = new_memory_config();
+    
+        WalletResult_t *wallet_result = new_wallet_result(desc, change, bc_config, db_config);
         assert(wallet_result != NULL);
+        free_blockchain_config(bc_config);
+        free_database_config(db_config);
         char *wallet_err = get_wallet_err(wallet_result);
         assert(wallet_err == NULL);
         WalletRef_t *wallet_ref = get_wallet_ok(wallet_result);
@@ -65,6 +77,7 @@ int main (int argc, char const * const argv[])
         
         // verify sync_wallet after free_wallet fails (core dumped)
         ////VoidResult_t sync_result2 = sync_wallet(wallet_result);   
+
     }
         
     return EXIT_SUCCESS;
diff --git a/src/blockchain.rs b/src/blockchain.rs
new file mode 100644
index 0000000..b3ecd8b
--- /dev/null
+++ b/src/blockchain.rs
@@ -0,0 +1,104 @@
+use ::safer_ffi::prelude::*;
+use bdk::blockchain::{AnyBlockchainConfig, ElectrumBlockchainConfig};
+use safer_ffi::boxed::Box;
+use safer_ffi::char_p::char_p_ref;
+
+#[derive_ReprC]
+#[ReprC::opaque]
+#[derive(Debug)]
+pub struct BlockchainConfig {
+    pub raw: AnyBlockchainConfig,
+}
+
+#[ffi_export]
+fn new_electrum_config(
+    url: char_p_ref,
+    socks5: Option<char_p_ref>,
+    retry: i16,
+    timeout: i16,
+) -> Box<BlockchainConfig> {
+    let url = url.to_string();
+    let socks5 = socks5.map(|s| s.to_string());
+    let retry = short_to_u8(retry);
+    let timeout = short_to_optional_u8(timeout);
+
+    let electrum_config = AnyBlockchainConfig::Electrum(ElectrumBlockchainConfig {
+        url,
+        socks5,
+        retry,
+        timeout,
+    });
+    Box::new(BlockchainConfig {
+        raw: electrum_config,
+    })
+}
+
+#[ffi_export]
+fn free_blockchain_config(blockchain_config: Box<BlockchainConfig>) {
+    drop(blockchain_config);
+}
+
+// TODO compact_filter rocksdb not compiling on android, switch to sqlite?
+//#[derive_ReprC]
+//#[repr(C)]
+//#[derive(Debug)]
+//pub struct BitcoinPeerConfig {
+//    pub address: char_p_boxed,
+//    pub socks5: Option<char_p_boxed>,
+//    pub socks5_credentials: Option<Box<Tuple2<char_p_boxed, char_p_boxed>>>,
+//}
+//
+//impl From<&BitcoinPeerConfig> for BdkBitcoinPeerConfig {
+//    fn from(config: &BitcoinPeerConfig) -> Self {
+//        let address = config.address.to_string();
+//        let socks5 = config.socks5.as_ref().map(|p| p.to_string());
+//        let socks5_credentials = config
+//            .socks5_credentials.as_ref()
+//            .map(|c| (c._0.to_string(), c._1.to_string()));
+//
+//        BdkBitcoinPeerConfig {
+//            address,
+//            socks5: socks5,
+//            socks5_credentials: socks5_credentials,
+//        }
+//    }
+//}
+//
+//
+//#[ffi_export]
+//fn new_compact_filters_config<'lt>(
+//    peers: c_slice::Ref<'lt, BitcoinPeerConfig>,
+//    network: char_p_ref,
+//    storage_dir: char_p_ref,
+//    skip_blocks: usize,
+//) -> Box<BlockchainConfig> {
+//    let peers = peers.iter().map(|p| p.into()).collect();
+//    let network = Network::from_str(network.to_str()).unwrap();
+//    let storage_dir = storage_dir.to_string();
+//    let skip_blocks = Some(skip_blocks);
+//    let cf_config = AnyBlockchainConfig::CompactFilters(CompactFiltersBlockchainConfig {
+//        peers,
+//        network,
+//        storage_dir,
+//        skip_blocks,
+//    });
+//    Box::new(BlockchainConfig { raw: cf_config })
+//}
+
+// utility functions
+
+fn short_to_optional_u8(short: i16) -> Option<u8> {
+    if short < 0 {
+        None
+    } else {
+        Some(short_to_u8(short))
+    }
+}
+
+fn short_to_u8(short: i16) -> u8 {
+    if short < 0 {
+        u8::MIN
+    } else {
+        u8::try_from(short).unwrap_or(u8::MAX)
+    }
+}
diff --git a/src/database.rs b/src/database.rs
new file mode 100644
index 0000000..76dc333
--- /dev/null
+++ b/src/database.rs
@@ -0,0 +1,32 @@
+use ::safer_ffi::prelude::*;
+use bdk::database::any::SledDbConfiguration;
+use bdk::database::AnyDatabaseConfig;
+use safer_ffi::boxed::Box;
+use safer_ffi::char_p::char_p_ref;
+
+#[derive_ReprC]
+#[ReprC::opaque]
+#[derive(Debug)]
+pub struct DatabaseConfig {
+    pub raw: AnyDatabaseConfig,
+}
+
+#[ffi_export]
+fn new_memory_config() -> Box<DatabaseConfig> {
+    let memory_config = AnyDatabaseConfig::Memory(());
+    Box::new(DatabaseConfig { raw: memory_config })
+}
+
+#[ffi_export]
+fn new_sled_config(path: char_p_ref, tree_name: char_p_ref) -> Box<DatabaseConfig> {
+    let path = path.to_string();
+    let tree_name = tree_name.to_string();
+
+    let sled_config = AnyDatabaseConfig::Sled(SledDbConfiguration { path, tree_name });
+    Box::new(DatabaseConfig { raw: sled_config })
+}
+
+#[ffi_export]
+fn free_database_config(database_config: Box<DatabaseConfig>) {
+    drop(database_config);
+}
diff --git a/src/error.rs b/src/error.rs
index 3aa6d82..6af73f0 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -38,8 +38,8 @@ pub fn get_name(error: &bdk::Error) -> String {
         Error::Hex(_) => "Hex",
         Error::Psbt(_) => "Psbt",
         Error::Electrum(_) => "Electrum",
-        //        Error::Esplora(_) => {}
-        //        Error::CompactFilters(_) => {}
+        //        Error::Esplora(_) => "Esplora",
+        //        Error::CompactFilters(_) => "CompactFilters",
         Error::Sled(_) => "Sled",
     }
     .to_string()
diff --git a/src/lib.rs b/src/lib.rs
index 3c75153..72e9910 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,7 @@
 #![deny(unsafe_code)] /* No `unsafe` needed! */
 
+mod blockchain;
+mod database;
 mod error;
 mod wallet;
 
diff --git a/src/wallet.rs b/src/wallet.rs
index 988bede..93ea73c 100644
--- a/src/wallet.rs
+++ b/src/wallet.rs
@@ -10,6 +10,8 @@ use bdk::wallet::AddressIndex::New;
 use bdk::{Error, Wallet};
 use safer_ffi::boxed::Box;
 use safer_ffi::char_p::{char_p_boxed, char_p_ref};
+use crate::blockchain::BlockchainConfig;
+use crate::database::DatabaseConfig;
 
 #[derive_ReprC]
 #[ReprC::opaque]
@@ -79,34 +81,30 @@ pub struct WalletResult {
 
 #[ffi_export]
 fn new_wallet_result(
-    name: char_p_ref,
     descriptor: char_p_ref,
     change_descriptor: Option<char_p_ref>,
+    blockchain_config: &BlockchainConfig,
+    database_config: &DatabaseConfig,
 ) -> Box<WalletResult> {
-    let name = name.to_string();
+    
     let descriptor = descriptor.to_string();
     let change_descriptor = change_descriptor.map(|s| s.to_string());
-    let wallet_result = new_wallet(name, descriptor, change_descriptor);
+    let bc_config = &blockchain_config.raw;
+    let db_config  = &database_config.raw;
+    let wallet_result = new_wallet(descriptor, change_descriptor, bc_config, db_config);
     Box::new(WalletResult { raw: wallet_result })
 }
 
 fn new_wallet(
-    _name: String,
     descriptor: String,
     change_descriptor: Option<String>,
+    blockchain_config: &AnyBlockchainConfig,
+    database_config: &AnyDatabaseConfig,
 ) -> Result<Wallet<AnyBlockchain, AnyDatabase>, Error> {
     let network = Testnet;
-    let electrum_config = AnyBlockchainConfig::Electrum(ElectrumBlockchainConfig {
-        url: "ssl://electrum.blockstream.info:60002".to_string(),
-        socks5: None,
-        retry: 5,
-        timeout: None,
-    });
-    let blockchain_config = electrum_config;
-    let client = AnyBlockchain::from_config(&blockchain_config)?;
 
-    let database_config = AnyDatabaseConfig::Memory(());
-    let database = AnyDatabase::from_config(&database_config)?;
+    let client = AnyBlockchain::from_config(blockchain_config)?;
+    let database = AnyDatabase::from_config(database_config)?;
 
     let descriptor: &str = descriptor.as_str();
     let change_descriptor: Option<&str> = change_descriptor.as_deref();
diff --git a/test.sh b/test.sh
index f6f86d5..03855c5 100755
--- a/test.sh
+++ b/test.sh
@@ -6,9 +6,9 @@ cargo test --features c-headers -- generate_headers
 
 # cc
 export LD_LIBRARY_PATH=`pwd`/target/debug
-#valgrind --leak-check=full cc/bdk_ffi_test
+#valgrind --leak-check=full --show-leak-kinds=all cc/bdk_ffi_test
 cc/bdk_ffi_test
 
-# bdk-kotlin
+## bdk-kotlin
 (cd bdk-kotlin && gradle test)
 (cd bdk-kotlin && gradle :android:connectedDebugAndroidTest)