diff --git a/Cargo.lock b/Cargo.lock
index 4003b2ef..2bc75ac1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2303,6 +2303,7 @@ dependencies = [
  "console_error_panic_hook",
  "ethers",
  "execution",
+ "eyre",
  "hex",
  "serde",
  "serde-wasm-bindgen",
diff --git a/client/src/client.rs b/client/src/client.rs
index 8529af6f..22ba4eee 100644
--- a/client/src/client.rs
+++ b/client/src/client.rs
@@ -217,6 +217,7 @@ impl ClientBuilder {
             fallback,
             load_external_fallback,
             strict_checkpoint_age,
+            database_type: None,
         };
 
         Client::<DB>::new(config)
diff --git a/config/src/config.rs b/config/src/config.rs
index 05a083d7..fcafcdb7 100644
--- a/config/src/config.rs
+++ b/config/src/config.rs
@@ -30,6 +30,7 @@ pub struct Config {
     pub fallback: Option<String>,
     pub load_external_fallback: bool,
     pub strict_checkpoint_age: bool,
+    pub database_type: Option<String>,
 }
 
 impl Config {
diff --git a/execution/src/execution.rs b/execution/src/execution.rs
index d96fb51d..ffcc124e 100644
--- a/execution/src/execution.rs
+++ b/execution/src/execution.rs
@@ -283,7 +283,7 @@ impl<R: ExecutionRpc> ExecutionClient<R> {
     }
 
     async fn verify_logs(&self, logs: &[Log]) -> Result<()> {
-        for (_pos, log) in logs.iter().enumerate() {
+        for log in logs.iter() {
             // For every log
             // Get the hash of the tx that generated it
             let tx_hash = log
diff --git a/helios-ts/Cargo.toml b/helios-ts/Cargo.toml
index 16f3c5c0..1f46edbf 100644
--- a/helios-ts/Cargo.toml
+++ b/helios-ts/Cargo.toml
@@ -15,6 +15,8 @@ wasm-bindgen-test = "0.3.0"
 serde-wasm-bindgen = "0.4.5"
 console_error_panic_hook = "0.1.7"
 
+eyre.workspace = true
+
 ethers = "2.0.2"
 hex = "0.4.3"
 serde = { version = "1.0.143", features = ["derive"] }
@@ -26,9 +28,7 @@ consensus = { path = "../consensus" }
 execution = { path = "../execution" }
 config = { path = "../config" }
 
+
 [dependencies.web-sys]
 version = "0.3"
-features = [
-  "console",
-]
-
+features = ["console", "Storage", "Window"]
diff --git a/helios-ts/index.html b/helios-ts/index.html
index d61fccc6..3b201ca4 100644
--- a/helios-ts/index.html
+++ b/helios-ts/index.html
@@ -9,7 +9,7 @@
     <script src="https://cdn.ethers.io/lib/ethers-5.7.umd.min.js"></script>
     <script>
       const config = {
-        executionRpc:"http://localhost:9001/proxy", 
+        executionRpc:"http://localhost:9001/proxy",
         consensusRpc: "http://localhost:9002/proxy",
         checkpoint: "0x3f692997a0c0c66baa549ba3b1897f705b44f36b412fc70ff0e78fdef647bbc3",
       };
diff --git a/helios-ts/lib.ts b/helios-ts/lib.ts
index bed7ccf4..fb015047 100644
--- a/helios-ts/lib.ts
+++ b/helios-ts/lib.ts
@@ -1,7 +1,8 @@
 import init, { Client } from "./pkg/index";
 
-
-export async function createHeliosProvider(config: Config): Promise<HeliosProvider> {
+export async function createHeliosProvider(
+  config: Config
+): Promise<HeliosProvider> {
   const wasmData = require("./pkg/index_bg.wasm");
   await init(wasmData);
   return new HeliosProvider(config);
@@ -19,8 +20,15 @@ export class HeliosProvider {
     const consensusRpc = config.consensusRpc;
     const checkpoint = config.checkpoint;
     const network = config.network ?? Network.MAINNET;
+    const dbType = config.dbType ?? "localstorage";
 
-    this.#client = new Client(executionRpc, consensusRpc, network, checkpoint);
+    this.#client = new Client(
+      executionRpc,
+      consensusRpc,
+      network,
+      checkpoint,
+      dbType
+    );
     this.#chainId = this.#client.chain_id();
   }
 
@@ -31,74 +39,78 @@ export class HeliosProvider {
   async waitSynced() {
     await this.#client.wait_synced();
   }
-  
+
   async request(req: Request): Promise<any> {
-    switch(req.method) {
+    switch (req.method) {
       case "eth_getBalance": {
         return this.#client.get_balance(req.params[0], req.params[1]);
-      };
+      }
       case "eth_chainId": {
         return this.#chainId;
-      };
+      }
       case "eth_blockNumber": {
         return this.#client.get_block_number();
-      };
+      }
       case "eth_getTransactionByHash": {
         let tx = await this.#client.get_transaction_by_hash(req.params[0]);
         return mapToObj(tx);
-      };
+      }
       case "eth_getTransactionCount": {
         return this.#client.get_transaction_count(req.params[0], req.params[1]);
-      };
+      }
       case "eth_getBlockTransactionCountByHash": {
         return this.#client.get_block_transaction_count_by_hash(req.params[0]);
-      };
+      }
       case "eth_getBlockTransactionCountByNumber": {
-        return this.#client.get_block_transaction_count_by_number(req.params[0]);
-      };
+        return this.#client.get_block_transaction_count_by_number(
+          req.params[0]
+        );
+      }
       case "eth_getCode": {
         return this.#client.get_code(req.params[0], req.params[1]);
-      };
+      }
       case "eth_call": {
         return this.#client.call(req.params[0], req.params[1]);
-      };
+      }
       case "eth_estimateGas": {
         return this.#client.estimate_gas(req.params[0]);
-      };
+      }
       case "eth_gasPrice": {
         return this.#client.gas_price();
-      };
+      }
       case "eth_maxPriorityFeePerGas": {
         return this.#client.max_priority_fee_per_gas();
-      };
+      }
       case "eth_sendRawTransaction": {
         return this.#client.send_raw_transaction(req.params[0]);
-      };
+      }
       case "eth_getTransactionReceipt": {
         return this.#client.get_transaction_receipt(req.params[0]);
-      };
+      }
       case "eth_getLogs": {
         return this.#client.get_logs(req.params[0]);
-      };
+      }
       case "net_version": {
         return this.#chainId;
-      };
+      }
       case "eth_getBlockByNumber": {
         return this.#client.get_block_by_number(req.params[0], req.params[1]);
-      };
+      }
       default: {
         throw `method not implemented: ${req.method}`;
-      };
+      }
     }
   }
 }
 
 export type Config = {
-  executionRpc: string,
-  consensusRpc?: string,
-  checkpoint?: string,
-  network?: Network,
-}
+  executionRpc: string;
+  consensusRpc?: string;
+  checkpoint?: string;
+  network?: Network;
+  /** Where to cache checkpoints, default to "localstorage" */
+  dbType?: "localstorage" | "config";
+};
 
 export enum Network {
   MAINNET = "mainnet",
@@ -106,12 +118,12 @@ export enum Network {
 }
 
 type Request = {
-  method: string,
-  params: any[],
-}
+  method: string;
+  params: any[];
+};
 
 function mapToObj(map: Map<any, any> | undefined): Object | undefined {
-  if(!map) return undefined;
+  if (!map) return undefined;
 
   return Array.from(map).reduce((obj: any, [key, value]) => {
     if (value !== undefined) {
@@ -121,4 +133,3 @@ function mapToObj(map: Map<any, any> | undefined): Object | undefined {
     return obj;
   }, {});
 }
-
diff --git a/helios-ts/src/lib.rs b/helios-ts/src/lib.rs
index a366f673..b589513d 100644
--- a/helios-ts/src/lib.rs
+++ b/helios-ts/src/lib.rs
@@ -4,14 +4,19 @@ extern crate web_sys;
 use std::str::FromStr;
 
 use common::types::BlockTag;
-use consensus::database::ConfigDB;
+use consensus::database::{ConfigDB, Database};
 use ethers::types::{Address, Filter, H256};
 use execution::types::CallOpts;
+use eyre::Result;
 
 use wasm_bindgen::prelude::*;
 
 use config::{networks, Config};
 
+use crate::storage::LocalStorageDB;
+
+pub mod storage;
+
 #[allow(unused_macros)]
 macro_rules! log {
     ( $( $t:tt )* ) => {
@@ -19,9 +24,40 @@ macro_rules! log {
     }
 }
 
+#[derive(Clone)]
+pub enum DatabaseType {
+    Memory(ConfigDB),
+    LocalStorage(LocalStorageDB),
+}
+
+impl Database for DatabaseType {
+    fn new(config: &Config) -> Result<Self> {
+        // Implement this method based on the behavior of ConfigDB and LocalStorageDB
+        match config.database_type.as_deref() {
+            Some("config") => Ok(DatabaseType::Memory(ConfigDB::new(config)?)),
+            Some("localstorage") => Ok(DatabaseType::LocalStorage(LocalStorageDB::new(config)?)),
+            _ => Ok(DatabaseType::Memory(ConfigDB::new(config)?)),
+        }
+    }
+
+    fn load_checkpoint(&self) -> Result<Vec<u8>> {
+        match self {
+            DatabaseType::Memory(db) => db.load_checkpoint(),
+            DatabaseType::LocalStorage(db) => db.load_checkpoint(),
+        }
+    }
+
+    fn save_checkpoint(&self, checkpoint: &[u8]) -> Result<()> {
+        match self {
+            DatabaseType::Memory(db) => db.save_checkpoint(checkpoint),
+            DatabaseType::LocalStorage(db) => db.save_checkpoint(checkpoint),
+        }
+    }
+}
+
 #[wasm_bindgen]
 pub struct Client {
-    inner: client::Client<ConfigDB>,
+    inner: client::Client<DatabaseType>,
     chain_id: u64,
 }
 
@@ -33,6 +69,7 @@ impl Client {
         consensus_rpc: Option<String>,
         network: String,
         checkpoint: Option<String>,
+        db_type: String,
     ) -> Self {
         console_error_panic_hook::set_once();
 
@@ -62,10 +99,11 @@ impl Client {
             chain: base.chain,
             forks: base.forks,
 
+            database_type: Some(db_type),
             ..Default::default()
         };
 
-        let inner: client::Client<ConfigDB> =
+        let inner: client::Client<DatabaseType> =
             client::ClientBuilder::new().config(config).build().unwrap();
 
         Self { inner, chain_id }
diff --git a/helios-ts/src/storage.rs b/helios-ts/src/storage.rs
new file mode 100644
index 00000000..562d77e9
--- /dev/null
+++ b/helios-ts/src/storage.rs
@@ -0,0 +1,49 @@
+extern crate console_error_panic_hook;
+extern crate web_sys;
+
+use config::Config;
+use consensus::database::Database;
+use eyre::Result;
+use wasm_bindgen::prelude::*;
+
+#[derive(Clone)]
+pub struct LocalStorageDB;
+
+impl Database for LocalStorageDB {
+    fn new(_config: &Config) -> Result<Self> {
+        console_error_panic_hook::set_once();
+        let window = web_sys::window().unwrap();
+        if let Ok(Some(_local_storage)) = window.local_storage() {
+            return Ok(Self {});
+        }
+
+        eyre::bail!("local_storage not available")
+    }
+
+    fn load_checkpoint(&self) -> Result<Vec<u8>> {
+        let window = web_sys::window().unwrap();
+        if let Ok(Some(local_storage)) = window.local_storage() {
+            let checkpoint = local_storage.get_item("checkpoint");
+            if let Ok(Some(checkpoint)) = checkpoint {
+                let checkpoint = checkpoint.strip_prefix("0x").unwrap_or(&checkpoint);
+                return hex::decode(checkpoint)
+                    .map_err(|_| eyre::eyre!("Failed to decode checkpoint"));
+            }
+            eyre::bail!("checkpoint not found")
+        }
+
+        eyre::bail!("local_storage not available")
+    }
+
+    fn save_checkpoint(&self, checkpoint: &[u8]) -> Result<()> {
+        let window = web_sys::window().unwrap();
+        if let Ok(Some(local_storage)) = window.local_storage() {
+            local_storage
+                .set_item("checkpoint", &hex::encode(checkpoint))
+                .unwrap_throw();
+            return Ok(());
+        }
+
+        eyre::bail!("local_storage not available")
+    }
+}
diff --git a/helios-ts/webpack.config.js b/helios-ts/webpack.config.js
index 854003f2..228d7f4b 100644
--- a/helios-ts/webpack.config.js
+++ b/helios-ts/webpack.config.js
@@ -7,7 +7,7 @@ module.exports = {
     rules: [
       {
         test: /\.ts?$/,
-        use: 'ts-loader',
+        use: "ts-loader",
         exclude: /node_modules/,
       },
       {
@@ -17,16 +17,16 @@ module.exports = {
     ],
   },
   resolve: {
-    extensions: ['.ts', '.js'],
+    extensions: [".ts", ".js"],
   },
   output: {
     filename: "lib.js",
-    globalObject: 'this', 
+    globalObject: "this",
     path: path.resolve(__dirname, "dist"),
     library: {
       name: "helios",
       type: "umd",
-    }
+    },
   },
   experiments: {
     asyncWebAssembly: true,