diff --git a/lib/block.ts b/lib/block.ts
index 7f98dc3..8466005 100644
--- a/lib/block.ts
+++ b/lib/block.ts
@@ -34,6 +34,10 @@ export default class Block extends WasmWrapper<WasmBlock> {
     return this.instance.hash;
   }
 
+  public get previousBlockHash(): string {
+    return this.instance.previous_block_hash;
+  }
+
   public serialize(): Uint8Array {
     return this.instance.serialize();
   }
diff --git a/lib/blockchain.ts b/lib/blockchain.ts
index 65d03dd..af5923b 100644
--- a/lib/blockchain.ts
+++ b/lib/blockchain.ts
@@ -120,4 +120,16 @@ export default class Blockchain extends WasmWrapper<WasmBlockchain> {
   }
 
   public async onNewBlock(block: Block, lc: boolean) {}
+
+  public async getLatestBlockId() {
+    return this.instance.get_latest_block_id();
+  }
+
+  public async getLongestChainHashAtId(blockId: bigint) {
+    return this.instance.get_longest_chain_hash_at_id(blockId);
+  }
+
+  public async getHashesAtId(blockId: bigint) {
+    return this.instance.get_hashes_at_id(blockId);
+  }
 }
diff --git a/lib/transaction.ts b/lib/transaction.ts
index 93618aa..216e82c 100644
--- a/lib/transaction.ts
+++ b/lib/transaction.ts
@@ -1,7 +1,6 @@
 import type { WasmTransaction } from "saito-wasm/pkg/node/index";
 import Slip from "./slip";
 import Saito from "../saito";
-import Factory from "./factory";
 import WasmWrapper from "./wasm_wrapper";
 
 export enum TransactionType {
@@ -134,10 +133,10 @@ export default class Transaction extends WasmWrapper<WasmTransaction> {
     };
   }
 
-  public static deserialize(buffer: Uint8Array, factory: Factory): Transaction | null {
+  public deserialize(buffer: Uint8Array) {
     try {
-      let wasmTx = Transaction.Type.deserialize(buffer);
-      return factory.createTransaction(wasmTx);
+      this.instance = Transaction.Type.deserialize(buffer);
+      this.unpackData();
     } catch (e) {
       console.error(e);
       return null;
diff --git a/package-lock.json b/package-lock.json
index 14e03e0..4d58691 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "saito-js",
-  "version": "0.0.27",
+  "version": "0.0.28",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "saito-js",
-      "version": "0.0.27",
+      "version": "0.0.28",
       "license": "ISC",
       "dependencies": {
         "buffer": "^6.0.3",
@@ -17,7 +17,7 @@
         "morgan": "~1.10.0",
         "node-fetch": "^2.6.1",
         "process": "^0.11.10",
-        "saito-wasm": "^0.0.16",
+        "saito-wasm": "^0.0.17",
         "url": "^0.11.0",
         "util": "^0.12.5",
         "ws": "^8.13.0"
@@ -4151,9 +4151,9 @@
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
     },
     "node_modules/saito-wasm": {
-      "version": "0.0.16",
-      "resolved": "https://registry.npmjs.org/saito-wasm/-/saito-wasm-0.0.16.tgz",
-      "integrity": "sha512-VvZ7+ZzR9mYc3/z9tq8Njln4QR8QwkiWzhmTkG8uQthMTxhBSLwACTFrXq5xFX5+l3l+tiqvSGao0LRPkqmtaA==",
+      "version": "0.0.17",
+      "resolved": "https://registry.npmjs.org/saito-wasm/-/saito-wasm-0.0.17.tgz",
+      "integrity": "sha512-1BPfAerMlmiOXHlgTpd891H6jBLci2cOJBcAiAmepxdlzG06qScgu9rKgN6pe4molSyTRKEkNY7MuCx96bgDFw==",
       "dependencies": {
         "cross-env": "^7.0.3",
         "node-fetch": "^3.3.0"
@@ -8195,9 +8195,9 @@
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
     },
     "saito-wasm": {
-      "version": "0.0.16",
-      "resolved": "https://registry.npmjs.org/saito-wasm/-/saito-wasm-0.0.16.tgz",
-      "integrity": "sha512-VvZ7+ZzR9mYc3/z9tq8Njln4QR8QwkiWzhmTkG8uQthMTxhBSLwACTFrXq5xFX5+l3l+tiqvSGao0LRPkqmtaA==",
+      "version": "0.0.17",
+      "resolved": "https://registry.npmjs.org/saito-wasm/-/saito-wasm-0.0.17.tgz",
+      "integrity": "sha512-1BPfAerMlmiOXHlgTpd891H6jBLci2cOJBcAiAmepxdlzG06qScgu9rKgN6pe4molSyTRKEkNY7MuCx96bgDFw==",
       "requires": {
         "cross-env": "^7.0.3",
         "node-fetch": "^3.3.0"
diff --git a/package.json b/package.json
index 3445849..411f04a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "saito-js",
-  "version": "0.0.27",
+  "version": "0.0.28",
   "description": "js wrappings around saito-core using wasm",
   "scripts": {
     "test": "env TS_NODE_PROJECT=\"tsconfig.testing.json\" mocha --require ts-node/register 'tests/**/*.ts'",
@@ -29,7 +29,7 @@
   "dependencies": {
     "buffer": "^6.0.3",
     "cookie-parser": "~1.4.6",
-    "saito-wasm": "^0.0.16",
+    "saito-wasm": "^0.0.17",
     "cors": "^2.8.5",
     "debug": "^4.3.4",
     "express": "~4.18.2",
diff --git a/saito.ts b/saito.ts
index 3245a6d..e47d4d3 100644
--- a/saito.ts
+++ b/saito.ts
@@ -411,16 +411,8 @@ export default class Saito {
     return this.blockchain;
   }
 
-  public testBufferIn(buffer: Uint8Array) {
-    return Saito.getLibInstance().test_buffer_in(buffer);
-  }
-
-  public testBufferOut(): Uint8Array {
-    return Saito.getLibInstance().test_buffer_out();
-  }
-
-  public printWasmMemUsage() {
-    // console.log("WASM memory usage : " + wasm.memory.buffer.byteLength);
+  public async getMempoolTxs() {
+    return Saito.getLibInstance().get_mempool_txs();
   }
 
   // public async loadWallet() {