diff --git a/README.md b/README.md
index 804d8f2..c8aa7b4 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
-## Create Genesis Block Proof with Node.js
+## Create Genesis Block Proof of Work with Node.js
 
-**Tested with Node.js version 8.x.x**
+**Tested with Node.js version 12.x.x**
 
 ## setup
 
diff --git a/genesis.js b/genesis.js
index d8718f5..7ba585b 100644
--- a/genesis.js
+++ b/genesis.js
@@ -21,7 +21,7 @@ var defaults = {
     locktime: 0
 }
 
-const argv = require('yargs')
+require('yargs')
     .alias('t', 'time')
     .alias('z', 'timestamp')
     .alias('n', 'nonce')
@@ -33,9 +33,10 @@ const argv = require('yargs')
     .alias('h', 'help')
     .help()
     .command('*', 'create genesis block', () => { }, (argv) => {
-        //console.log(argv);
+        // console.log(argv);
+
         var options = Object.assign({}, defaults, argv);
-        //console.log(options);
+        // console.log(options);
 
         var merkle_root = $.sha256d(createTx(options));
         var genesisblock = createBlock(merkle_root, options);
@@ -48,6 +49,7 @@ const argv = require('yargs')
         console.log("merkle root hash: %s", $.reverseBuffer(merkle_root).toString('hex'));
 
         PoW(genesisblock, options);
+
         //console.log("genesis block: %s", genesisblock.toString('hex'));
         // console.log($.reverseBuffer(hash_merkle_root).toString('hex'));
 
@@ -69,9 +71,10 @@ function createOutputScript(options) {
 
 function createTx(options) {
 
+
     var input = createInputScript(options);
     var out = createOutputScript(options);
-
+   
     var size = 4    // tx version
         + 1   // number of inputs
         + 32  // hash of previous output
@@ -87,26 +90,32 @@ function createTx(options) {
 
 
     var tx = Buffer.alloc(size);
+
     var position = 0;
-    tx.writeIntLE(1, position, true);
-    tx.writeIntLE(1, position += 4, true);
-    tx.write(new Buffer(32).toString('hex'), position += 1, 32, 'hex');
-    tx.writeInt32LE(0xFFFFFFFF, position += 32, true);
-    tx.writeIntLE(input.length, position += 4, true);
+
+    tx.writeInt32LE(1, position);
+    tx.writeInt32LE(1, position += 4);
+    tx.write(Buffer.alloc(32).toString('hex'), position += 1, 32, 'hex');
+    //tx.writeInt32LE(0xFFFFFFFF, position += 32, 4);
+    tx.writeDoubleLE(0xFFFFFFFF, position += 32, 4);
+    tx.writeInt32LE(input.length, position += 4);
     tx.write(input.toString('hex'), position += 1, input.length, "hex");
-    tx.writeInt32LE(0xFFFFFFFF, position += input.length, true);
-    tx.writeIntLE(1, position += 4);
+    //tx.writeInt32LE(0xFFFFFFFF, position += input.length, 4);
+    tx.writeDoubleLE(0xFFFFFFFF, position += input.length);
+    tx.writeInt32LE(1, position += 4);
     tx.write(Buffer.from($.numToBytes(options.value)).toString('hex'), position += 1, 8, 'hex'); // 50 * coin
     tx.writeInt32LE(0x43, position += 8);
     //tx.write(input.toString('hex'), position += 1, input.length, "hex");
     tx.write(out.toString('hex'), position += 1, out.length, "hex");
-    tx.writeIntLE(options.locktime, position += out.length);
+    tx.writeInt32LE(options.locktime, position += out.length);
 
 
-    //console.log(tx.toString('hex'));
+    // console.log(tx.toString('hex'));
 
     return tx;
 
+
+
 };
 
 
@@ -115,8 +124,8 @@ function createBlock(merkleRoot, options) {
     var block = Buffer.alloc(80);
     var position = 0;
 
-    block.writeIntLE(1, position); //version  
-    block.write(new Buffer(32).toString('hex'), position += 4, 32, 'hex'); //previousblockhash
+    block.writeInt32LE(1, position); //version  
+    block.write(Buffer.alloc(32).toString('hex'), position += 4, 32, 'hex'); //previousblockhash
     block.write(merkleRoot.toString('hex'), position += 32, 32, 'hex');
     block.writeInt32LE(options.time, position += 32);
     //block.write(Buffer.from($.numToBytes(options.time)).toString('hex'), position += 32, 4, 'hex');
@@ -124,7 +133,7 @@ function createBlock(merkleRoot, options) {
     block.writeInt32LE(options.bits, position += 4);
     //block.write(Buffer.from($.numToBytes(options.bits)).toString('hex'), position += 4, 4, 'hex');
 
-    block.writeIntLE(options.nonce, position += 4);
+    block.writeInt32LE(options.nonce, position += 4);
 
     return block;
 
diff --git a/package-lock.json b/package-lock.json
index bbfef9f..623e1f5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,9 +15,12 @@
       "integrity": "sha512-x247jIuy60/+FtMRvscqfxtVHQf8AGx2hm9c6btkgC0x/hp9yt+teISNhvF8WlwRkCc5yF2fDECH8SIMe8j+GA=="
     },
     "bindings": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.3.0.tgz",
-      "integrity": "sha512-DpLh5EzMR2kzvX1KIlVC0VkC3iZtHKTgdtZ0a3pglBZdaQFjt5S9g9xd1lE+YvXyfd6mtCeRnrUfOLYiTMlNSw=="
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
+      "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
+      "requires": {
+        "file-uri-to-path": "1.0.0"
+      }
     },
     "bn.js": {
       "version": "4.11.8",
@@ -29,7 +32,7 @@
       "resolved": "https://registry.npmjs.org/bytebuffer/-/bytebuffer-5.0.1.tgz",
       "integrity": "sha1-WC7qSxqHO20CCkjVjfhfC7ps/d0=",
       "requires": {
-        "long": "3.2.0"
+        "long": "~3"
       }
     },
     "camelcase": {
@@ -38,13 +41,13 @@
       "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0="
     },
     "cliui": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.0.0.tgz",
-      "integrity": "sha512-nY3W5Gu2racvdDk//ELReY+dHjb9PlIcVDFXP72nVIhq2Gy3LuVXYwJoPVudwQnv1shtohpgkdCKT2YaKY0CKw==",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
+      "integrity": "sha512-4FG+RSG9DL7uEwRUZXZn3SS34DiDPfzP0VOiEwtUWlE+AR2EIg+hSyvrIgUUfhdgR/UkAeW2QHgeP+hWrXs7jQ==",
       "requires": {
-        "string-width": "2.1.1",
-        "strip-ansi": "4.0.0",
-        "wrap-ansi": "2.1.0"
+        "string-width": "^2.1.1",
+        "strip-ansi": "^4.0.0",
+        "wrap-ansi": "^2.0.0"
       }
     },
     "code-point-at": {
@@ -53,13 +56,15 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
     },
     "cross-spawn": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz",
-      "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
+      "version": "6.0.5",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
+      "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
       "requires": {
-        "lru-cache": "4.1.2",
-        "shebang-command": "1.2.0",
-        "which": "1.3.0"
+        "nice-try": "^1.0.4",
+        "path-key": "^2.0.1",
+        "semver": "^5.5.0",
+        "shebang-command": "^1.2.0",
+        "which": "^1.2.9"
       }
     },
     "crypto": {
@@ -72,42 +77,58 @@
       "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA="
     },
-    "execa": {
-      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/execa/-/execa-0.7.0.tgz",
-      "integrity": "sha1-lEvs00zEHuMqY6n68nrVpl/Fl3c=",
+    "end-of-stream": {
+      "version": "1.4.4",
+      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.4.tgz",
+      "integrity": "sha512-+uw1inIHVPQoaVuHzRyXd21icM+cnt4CzD5rW+NC1wjOUSTOs+Te7FOv7AhN7vS9x/oIyhLP5PR1H+phQAHu5Q==",
       "requires": {
-        "cross-spawn": "5.1.0",
-        "get-stream": "3.0.0",
-        "is-stream": "1.1.0",
-        "npm-run-path": "2.0.2",
-        "p-finally": "1.0.0",
-        "signal-exit": "3.0.2",
-        "strip-eof": "1.0.0"
+        "once": "^1.4.0"
       }
     },
+    "execa": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/execa/-/execa-1.0.0.tgz",
+      "integrity": "sha512-adbxcyWV46qiHyvSp50TKt05tB4tK3HcmF7/nxfAdhnox83seTDbwnaqKO4sXRy7roHAIFqJP/Rw/AuEbX61LA==",
+      "requires": {
+        "cross-spawn": "^6.0.0",
+        "get-stream": "^4.0.0",
+        "is-stream": "^1.1.0",
+        "npm-run-path": "^2.0.0",
+        "p-finally": "^1.0.0",
+        "signal-exit": "^3.0.0",
+        "strip-eof": "^1.0.0"
+      }
+    },
+    "file-uri-to-path": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
+      "integrity": "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw=="
+    },
     "find-up": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
       "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
       "requires": {
-        "locate-path": "2.0.0"
+        "locate-path": "^2.0.0"
       }
     },
     "get-caller-file": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.2.tgz",
-      "integrity": "sha1-9wLmMSfn4jHBYKgMFVSstw1QR+U="
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+      "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w=="
     },
     "get-stream": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
-      "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
+      "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==",
+      "requires": {
+        "pump": "^3.0.0"
+      }
     },
     "invert-kv": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-1.0.0.tgz",
-      "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY="
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-2.0.0.tgz",
+      "integrity": "sha512-wPVv/y/QQ/Uiirj/vh3oP+1Ww+AWehmi1g5fFWGPF6IpCBCDVrhgHRMvrLfdYcwDh3QJbGXDW4JAuzxElLSqKA=="
     },
     "is-fullwidth-code-point": {
       "version": "2.0.0",
@@ -125,11 +146,11 @@
       "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA="
     },
     "lcid": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
-      "integrity": "sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/lcid/-/lcid-2.0.0.tgz",
+      "integrity": "sha512-avPEb8P8EGnwXKClwsNUgryVjllcRqtMYa49NTsbQagYuT1DcXnl1915oxWjoyGrXR6zH/Y0Zc96xWsPcoDKeA==",
       "requires": {
-        "invert-kv": "1.0.0"
+        "invert-kv": "^2.0.0"
       }
     },
     "locate-path": {
@@ -137,8 +158,8 @@
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-2.0.0.tgz",
       "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
       "requires": {
-        "p-locate": "2.0.0",
-        "path-exists": "3.0.0"
+        "p-locate": "^2.0.0",
+        "path-exists": "^3.0.0"
       }
     },
     "long": {
@@ -146,50 +167,57 @@
       "resolved": "https://registry.npmjs.org/long/-/long-3.2.0.tgz",
       "integrity": "sha1-2CG3E4yhy1gcFymQ7xTbIAtcR0s="
     },
-    "lru-cache": {
-      "version": "4.1.2",
-      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.2.tgz",
-      "integrity": "sha512-wgeVXhrDwAWnIF/yZARsFnMBtdFXOg1b8RIrhilp+0iDYN4mdQcNZElDZ0e4B64BhaxeQ5zN7PMyvu7we1kPeQ==",
+    "map-age-cleaner": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/map-age-cleaner/-/map-age-cleaner-0.1.3.tgz",
+      "integrity": "sha512-bJzx6nMoP6PDLPBFmg7+xRKeFZvFboMrGlxmNj9ClvX53KrmvM5bXFXEWjbz4cz1AFn+jWJ9z/DJSz7hrs0w3w==",
       "requires": {
-        "pseudomap": "1.0.2",
-        "yallist": "2.1.2"
+        "p-defer": "^1.0.0"
       }
     },
     "mem": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/mem/-/mem-1.1.0.tgz",
-      "integrity": "sha1-Xt1StIXKHZAP5kiVUFOZoN+kX3Y=",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/mem/-/mem-4.3.0.tgz",
+      "integrity": "sha512-qX2bG48pTqYRVmDB37rn/6PT7LcR8T7oAX3bf99u1Tt1nzxYfxkgqDwUwolPlXweM0XzBOBFzSx4kfp7KP1s/w==",
       "requires": {
-        "mimic-fn": "1.2.0"
+        "map-age-cleaner": "^0.1.1",
+        "mimic-fn": "^2.0.0",
+        "p-is-promise": "^2.0.0"
       }
     },
     "mimic-fn": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-1.2.0.tgz",
-      "integrity": "sha512-jf84uxzwiuiIVKiOLpfYk7N46TSy8ubTonmneY9vrpHNAnp0QBt2BxWV9dO3/j+BoVAb+a5G6YDPW3M5HOdMWQ=="
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-2.1.0.tgz",
+      "integrity": "sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg=="
     },
     "multi-hashing": {
-      "version": "git+https://github.com/nasa8x/node-multi-hashing.git#d04972dd1dfa014f18a6c032199bf7239ed98d5f",
+      "version": "git+https://github.com/nasa8x/node-multi-hashing.git#25517b7c7896c9c2b5e342a4e0c835adb0b11951",
+      "from": "git+https://github.com/nasa8x/node-multi-hashing.git",
       "requires": {
-        "bignumber.js": "6.0.0",
-        "bindings": "1.3.0",
-        "bn.js": "4.11.8",
-        "bytebuffer": "5.0.1",
-        "nan": "2.10.0",
-        "yargs": "11.0.0"
+        "bignumber.js": "^6.0.0",
+        "bindings": "^1.5.0",
+        "bn.js": "^4.11.8",
+        "bytebuffer": "^5.0.1",
+        "nan": "^2.14.0",
+        "yargs": "^11.1.1"
       }
     },
     "nan": {
-      "version": "2.10.0",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.10.0.tgz",
-      "integrity": "sha512-bAdJv7fBLhWC+/Bls0Oza+mvTaNQtP+1RyhhhvD95pgUJz6XM5IzgmxOkItJ9tkoCiplvAnXI1tNmmUD/eScyA=="
+      "version": "2.14.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
+      "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg=="
+    },
+    "nice-try": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/nice-try/-/nice-try-1.0.5.tgz",
+      "integrity": "sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ=="
     },
     "npm-run-path": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/npm-run-path/-/npm-run-path-2.0.2.tgz",
       "integrity": "sha1-NakjLfo11wZ7TLLd8jV7GHFTbF8=",
       "requires": {
-        "path-key": "2.0.1"
+        "path-key": "^2.0.0"
       }
     },
     "number-is-nan": {
@@ -197,27 +225,45 @@
       "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
       "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
     },
-    "os-locale": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-2.1.0.tgz",
-      "integrity": "sha512-3sslG3zJbEYcaC4YVAvDorjGxc7tv6KVATnLPZONiljsUncvihe9BQoVCEs0RZ1kmf4Hk9OBqlZfJZWI4GanKA==",
+    "once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
       "requires": {
-        "execa": "0.7.0",
-        "lcid": "1.0.0",
-        "mem": "1.1.0"
+        "wrappy": "1"
       }
     },
+    "os-locale": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-3.1.0.tgz",
+      "integrity": "sha512-Z8l3R4wYWM40/52Z+S265okfFj8Kt2cC2MKY+xNi3kFs+XGI7WXu/I309QQQYbRW4ijiZ+yxs9pqEhJh0DqW3Q==",
+      "requires": {
+        "execa": "^1.0.0",
+        "lcid": "^2.0.0",
+        "mem": "^4.0.0"
+      }
+    },
+    "p-defer": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/p-defer/-/p-defer-1.0.0.tgz",
+      "integrity": "sha1-n26xgvbJqozXQwBKfU+WsZaw+ww="
+    },
     "p-finally": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
       "integrity": "sha1-P7z7FbiZpEEjs0ttzBi3JDNqLK4="
     },
+    "p-is-promise": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/p-is-promise/-/p-is-promise-2.1.0.tgz",
+      "integrity": "sha512-Y3W0wlRPK8ZMRbNq97l4M5otioeA5lm1z7bkNkxCka8HSPjR0xRWmpCmc9utiaLP9Jb1eD8BgeIxTW4AIF45Pg=="
+    },
     "p-limit": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-1.2.0.tgz",
-      "integrity": "sha512-Y/OtIaXtUPr4/YpMv1pCL5L5ed0rumAaAeBSj12F+bSlMdys7i8oQF/GUJmfpTS/QoaRrS/k6pma29haJpsMng==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-1.3.0.tgz",
+      "integrity": "sha512-vvcXsLAJ9Dr5rQOPk7toZQZJApBl2K4J6dANSsEuh6QI41JYcsS/qhTGa9ErIUUgK3WNQoJYvylxvjqmiqEA9Q==",
       "requires": {
-        "p-try": "1.0.0"
+        "p-try": "^1.0.0"
       }
     },
     "p-locate": {
@@ -225,7 +271,7 @@
       "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-2.0.0.tgz",
       "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
       "requires": {
-        "p-limit": "1.2.0"
+        "p-limit": "^1.1.0"
       }
     },
     "p-try": {
@@ -243,10 +289,14 @@
       "resolved": "https://registry.npmjs.org/path-key/-/path-key-2.0.1.tgz",
       "integrity": "sha1-QRyttXTFoUDTpLGRDUDYDMn0C0A="
     },
-    "pseudomap": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/pseudomap/-/pseudomap-1.0.2.tgz",
-      "integrity": "sha1-8FKijacOYYkX7wqKw0wa5aaChrM="
+    "pump": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
+      "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
+      "requires": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.1"
+      }
     },
     "require-directory": {
       "version": "2.1.1",
@@ -258,6 +308,11 @@
       "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
       "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE="
     },
+    "semver": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+      "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ=="
+    },
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
@@ -268,7 +323,7 @@
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
       "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=",
       "requires": {
-        "shebang-regex": "1.0.0"
+        "shebang-regex": "^1.0.0"
       }
     },
     "shebang-regex": {
@@ -286,8 +341,8 @@
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
       "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
       "requires": {
-        "is-fullwidth-code-point": "2.0.0",
-        "strip-ansi": "4.0.0"
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^4.0.0"
       }
     },
     "strip-ansi": {
@@ -295,7 +350,7 @@
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
       "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
       "requires": {
-        "ansi-regex": "3.0.0"
+        "ansi-regex": "^3.0.0"
       }
     },
     "strip-eof": {
@@ -304,11 +359,11 @@
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8="
     },
     "which": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
-      "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-module": {
@@ -321,8 +376,8 @@
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "requires": {
-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1"
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
       },
       "dependencies": {
         "ansi-regex": {
@@ -335,7 +390,7 @@
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
           }
         },
         "string-width": {
@@ -343,9 +398,9 @@
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         },
         "strip-ansi": {
@@ -353,38 +408,38 @@
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         }
       }
     },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
     "y18n": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
       "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
     },
-    "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
-    },
     "yargs": {
-      "version": "11.0.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.0.0.tgz",
-      "integrity": "sha512-Rjp+lMYQOWtgqojx1dEWorjCofi1YN7AoFvYV7b1gx/7dAAeuI4kN5SZiEvr0ZmsZTOpDRcCqrpI10L31tFkBw==",
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.1.tgz",
+      "integrity": "sha512-PRU7gJrJaXv3q3yQZ/+/X6KBswZiaQ+zOmdprZcouPYtQgvNU35i+68M4b1ZHLZtYFT5QObFLV+ZkmJYcwKdiw==",
       "requires": {
-        "cliui": "4.0.0",
-        "decamelize": "1.2.0",
-        "find-up": "2.1.0",
-        "get-caller-file": "1.0.2",
-        "os-locale": "2.1.0",
-        "require-directory": "2.1.1",
-        "require-main-filename": "1.0.1",
-        "set-blocking": "2.0.0",
-        "string-width": "2.1.1",
-        "which-module": "2.0.0",
-        "y18n": "3.2.1",
-        "yargs-parser": "9.0.2"
+        "cliui": "^4.0.0",
+        "decamelize": "^1.1.1",
+        "find-up": "^2.1.0",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^3.1.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^2.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^9.0.2"
       }
     },
     "yargs-parser": {
@@ -392,7 +447,7 @@
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz",
       "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=",
       "requires": {
-        "camelcase": "4.1.0"
+        "camelcase": "^4.1.0"
       }
     }
   }
diff --git a/package.json b/package.json
index dcee1ea..580493d 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,6 @@
   "dependencies": {
     "crypto": "^1.0.1",
     "multi-hashing": "git+https://github.com/nasa8x/node-multi-hashing.git",
-    "yargs": "^11.1.0"
+    "yargs": "^11.1.1"
   }
 }
diff --git a/test.js b/test.js
new file mode 100644
index 0000000..3e72c75
--- /dev/null
+++ b/test.js
@@ -0,0 +1,8 @@
+
+
+var number = parseInt();
+
+
+ var buff = Buffer.alloc(8);
+ buff.writeDoubleLE(0xFFFFFFFF, 0);
+ console.log(buff);
\ No newline at end of file
diff --git a/utils.js b/utils.js
index 2cf5d13..ad1ac22 100644
--- a/utils.js
+++ b/utils.js
@@ -10,6 +10,12 @@ function swapHex(value) {
   return s2;
 }
 
+function intToHex(integer) {
+  let number = integer.toString(16).toUpperCase()
+  if( (number.length % 2) > 0 ) { number= "0" + number }
+  return number
+}
+
 function numToBytes(num, bytes) {
   if (bytes === undefined) bytes = 8;
   if (bytes == 0) return [];
@@ -59,6 +65,7 @@ function reverseBuffer(buff) {
 };
 
 module.exports = {
+  intToHex,
   swapHex,
   numToBytes,
   numToVarInt,