diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 674730de..ae84f231 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,16 @@ jobs:
           cache: npm
 
       - name: Install dependencies
-        run: npm install
+        run: npm ci
 
       - name: Run quality-check
         run: npm run quality-check
+
+      - name: Reject critical runtime advisories
+        run: npm audit --omit=dev --audit-level=critical
+
+      - name: Run signing security regression tests
+        run: npm run test_signing_ci
+
+      - name: Build production bundle
+        run: npm run build_prod
diff --git a/Dockerfile b/Dockerfile
index 00bb52bb..c0448e6b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ COPY ./.npmrc .
 
 # install frontend dependencies before copying the frontend code
 # into the container so we get docker cache benefits
-RUN npm install
+RUN npm ci
 
 # don't allow any dependencies with vulnerabilities
 #RUN npx audit-ci --low
diff --git a/angular.json b/angular.json
index 54e1967a..0eb7cb97 100644
--- a/angular.json
+++ b/angular.json
@@ -118,12 +118,15 @@
           }
         },
         "test": {
-          "builder": "@angular-bulders/custom-webpack:karma",
+          "builder": "@angular-builders/custom-webpack:karma",
           "options": {
             "main": "src/test.ts",
             "polyfills": "src/polyfills.ts",
             "tsConfig": "tsconfig.spec.json",
             "karmaConfig": "karma.conf.js",
+            "customWebpackConfig": {
+              "path": "./webpack.config.js"
+            },
             "assets": ["src/favicon.ico", "src/assets"],
             "styles": ["src/styles.scss"],
             "scripts": []
diff --git a/package-lock.json b/package-lock.json
index 8c297fe4..8268c72a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -35,16 +35,16 @@
         "bip39": "^3.0.3",
         "crypto-browserify": "^3.12.0",
         "currency-symbol-map": "^5.0.1",
-        "elliptic": "^6.5.4",
+        "elliptic": "6.6.1",
         "ethereumjs-tx": "^2.1.2",
         "ethereumjs-util": "^7.1.4",
         "ethers": "^5.6.9",
         "feather-icons": "^4.29.0",
         "hdkey": "github:deso-protocol/hdkey",
         "intl-tel-input": "^18.1.7",
-        "jsonwebtoken": "^8.5.1",
+        "jws": "4.0.1",
         "key-encoder": "^2.0.3",
-        "lodash": "^4.17.21",
+        "lodash": "4.18.1",
         "ng-hcaptcha": "^2.2.0",
         "ngx-cookie": "^6.0.1",
         "process": "^0.11.10",
@@ -73,7 +73,7 @@
         "@types/hdkey": "^0.7.1",
         "@types/intl-tel-input": "^18.1.0",
         "@types/jasmine": "~3.8.0",
-        "@types/jsonwebtoken": "^8.5.1",
+        "@types/jws": "3.2.11",
         "@types/node": "^12.11.1",
         "@types/readable-stream": "^2.3.14",
         "@types/reflect-metadata": "^0.1.0",
@@ -6129,11 +6129,12 @@
       "integrity": "sha512-Hr5Jfhc9eYOQNPYO5WLDq/n4jqijdHNlDXjuAQkkt+mWdQR+XJToOHrsD4cPaMXpn6KO7y2+wM8AZEs8VpBLVA==",
       "dev": true
     },
-    "node_modules/@types/jsonwebtoken": {
-      "version": "8.5.9",
-      "resolved": "https://registry.npmjs.org/@types/jsonwebtoken/-/jsonwebtoken-8.5.9.tgz",
-      "integrity": "sha512-272FMnFGzAVMGtu9tkr29hRL6bZj4Zs1KZNeHLnKqAvp06tAIcarTMwOh8/8bz4FmKRcMxZhZNeUAQsNLoiPhg==",
+    "node_modules/@types/jws": {
+      "version": "3.2.11",
+      "resolved": "https://registry.npmjs.org/@types/jws/-/jws-3.2.11.tgz",
+      "integrity": "sha512-OOaTrLV6XdF1XvBgMeH1MjNuOaGCrRZWNSIds1AQaRgLdOWlAk2yMsfrJn+ekLgUow3xksWIM231lyFab7mHHw==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "@types/node": "*"
       }
@@ -7474,9 +7475,13 @@
       }
     },
     "node_modules/available-typed-arrays": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.5.tgz",
-      "integrity": "sha512-DMD0KiN46eipeziST1LPP/STfDU0sufISXmjSgvVsoU2tqxctQeASejWcfNtxYKqETM1UxQ8sp2OrSBWpHY6sw==",
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.7.tgz",
+      "integrity": "sha512-wvUjBtSGN7+7SjNpq/9M2Tg350UZD3q62IFZLbRAR1bSMlCo1ZaeW+BJ+D090e4hIIZLBcTDWe4Mh4jvUDajzQ==",
+      "license": "MIT",
+      "dependencies": {
+        "possible-typed-array-names": "^1.0.0"
+      },
       "engines": {
         "node": ">= 0.4"
       },
@@ -7832,12 +7837,17 @@
       }
     },
     "node_modules/browserify-rsa": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.1.0.tgz",
-      "integrity": "sha512-AdEER0Hkspgno2aR97SAf6vi0y0k8NuOpGnVH3O99rcA5Q6sh8QxcngtHuJ6uXwnfAXNM4Gn1Gb7/MV1+Ymbog==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.1.1.tgz",
+      "integrity": "sha512-YBjSAiTqM04ZVei6sXighu679a3SqWORA3qZTEqZImnlkDIFtKc6pNutpjyZ8RJTjQtuYfeetkxM11GwoYXMIQ==",
+      "license": "MIT",
       "dependencies": {
-        "bn.js": "^5.0.0",
-        "randombytes": "^2.0.1"
+        "bn.js": "^5.2.1",
+        "randombytes": "^2.1.0",
+        "safe-buffer": "^5.2.1"
+      },
+      "engines": {
+        "node": ">= 0.10"
       }
     },
     "node_modules/browserify-rsa/node_modules/bn.js": {
@@ -7845,26 +7855,72 @@
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.1.tgz",
       "integrity": "sha512-eXRvHzWyYPBuB4NBy0cmYQjGitUrtqwbvlzP3G6VFnNRbsZQIxQ10PbKKHt8gZ/HW/D/747aDl+QkDqg3KQLMQ=="
     },
+    "node_modules/browserify-rsa/node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/browserify-sign": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.1.tgz",
-      "integrity": "sha512-/vrA5fguVAKKAVTNJjgSm1tRQDHUU6DbwO9IROu/0WAzC8PKhucDSh18J0RMvVeHAn5puMd+QHC2erPRNf8lmg==",
+      "version": "4.2.6",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.6.tgz",
+      "integrity": "sha512-sd+Q65fjlWCYWtZKXiKfrUc8d+4jtp/8f0W2NkwzLtoW4bI6UDnWusLWIurHnmurW0XShIRxpwiOX4EoPtXUAg==",
+      "license": "ISC",
       "dependencies": {
-        "bn.js": "^5.1.1",
-        "browserify-rsa": "^4.0.1",
+        "bn.js": "^5.2.3",
+        "browserify-rsa": "^4.1.1",
         "create-hash": "^1.2.0",
         "create-hmac": "^1.1.7",
-        "elliptic": "^6.5.3",
+        "elliptic": "^6.6.1",
         "inherits": "^2.0.4",
-        "parse-asn1": "^5.1.5",
-        "readable-stream": "^3.6.0",
-        "safe-buffer": "^5.2.0"
+        "parse-asn1": "^5.1.9",
+        "readable-stream": "^2.3.8",
+        "safe-buffer": "^5.2.1"
+      },
+      "engines": {
+        "node": ">= 0.10"
       }
     },
     "node_modules/browserify-sign/node_modules/bn.js": {
-      "version": "5.2.1",
-      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.1.tgz",
-      "integrity": "sha512-eXRvHzWyYPBuB4NBy0cmYQjGitUrtqwbvlzP3G6VFnNRbsZQIxQ10PbKKHt8gZ/HW/D/747aDl+QkDqg3KQLMQ=="
+      "version": "5.2.5",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.5.tgz",
+      "integrity": "sha512-Vq886eXykuP5E6HcKSSStP3bJgrE6In5WKxVUvJ8XGpWWYs2xZHWqUwzCtGgEtBcxyd57KBFDPFoUfNzdaHCNg==",
+      "license": "MIT"
+    },
+    "node_modules/browserify-sign/node_modules/readable-stream": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.8.tgz",
+      "integrity": "sha512-8p0AUk4XODgIewSi0l8Epjs+EVnWiK7NoDIEGU0HhE7+ZyY8D1IMY7odu5lRrFXGg71L15KG8QrPmum45RTtdA==",
+      "license": "MIT",
+      "dependencies": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      }
+    },
+    "node_modules/browserify-sign/node_modules/readable-stream/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "license": "MIT"
     },
     "node_modules/browserify-sign/node_modules/safe-buffer": {
       "version": "5.2.1",
@@ -7885,6 +7941,21 @@
         }
       ]
     },
+    "node_modules/browserify-sign/node_modules/string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
+    "node_modules/browserify-sign/node_modules/string_decoder/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "license": "MIT"
+    },
     "node_modules/browserslist": {
       "version": "4.21.9",
       "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.21.9.tgz",
@@ -8020,7 +8091,8 @@
     "node_modules/buffer-equal-constant-time": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
-      "integrity": "sha512-zRpUiDwd/xk6ADqPMATG8vc9VPrkck7T07OIx0gnjmJAnHnTVXNQG3vfvWNuiZIkwu9KrKdA1iJKfsfTVxE6NA=="
+      "integrity": "sha512-zRpUiDwd/xk6ADqPMATG8vc9VPrkck7T07OIx0gnjmJAnHnTVXNQG3vfvWNuiZIkwu9KrKdA1iJKfsfTVxE6NA==",
+      "license": "BSD-3-Clause"
     },
     "node_modules/buffer-from": {
       "version": "1.1.2",
@@ -8110,12 +8182,47 @@
       }
     },
     "node_modules/call-bind": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.9.tgz",
+      "integrity": "sha512-a/hy+pNsFUTR+Iz8TCJvXudKVLAnz/DyeSUo10I5yvFDQJBFU2s9uqQpoSrJlroHUKoKqzg+epxyP9lqFdzfBQ==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bind-apply-helpers": "^1.0.2",
+        "es-define-property": "^1.0.1",
+        "get-intrinsic": "^1.3.0",
+        "set-function-length": "^1.2.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/call-bind-apply-helpers": {
       "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
-      "integrity": "sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==",
+      "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
+      "integrity": "sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==",
+      "license": "MIT",
       "dependencies": {
-        "function-bind": "^1.1.1",
-        "get-intrinsic": "^1.0.2"
+        "es-errors": "^1.3.0",
+        "function-bind": "^1.1.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/call-bound": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
+      "integrity": "sha512-+ys997U96po4Kx/ABpBCqhA9EuxJaQWDQg7295H4hBphv3IZg0boBKuwYpt4YXp6MZ5AmZQnU/tyMTlRpaSejg==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bind-apply-helpers": "^1.0.2",
+        "get-intrinsic": "^1.3.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
       },
       "funding": {
         "url": "https://github.com/sponsors/ljharb"
@@ -8230,14 +8337,39 @@
       }
     },
     "node_modules/cipher-base": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.4.tgz",
-      "integrity": "sha512-Kkht5ye6ZGmwv40uUDZztayT2ThLQGfnj/T71N/XzeZeo3nf8foyW7zGTsPYkEya3m5f3cAypH+qe7YOrM1U2Q==",
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.7.tgz",
+      "integrity": "sha512-Mz9QMT5fJe7bKI7MH31UilT5cEK5EHHRCccw/YRFsRY47AuNgaV6HY3rscp0/I4Q+tTW/5zoqpSeRRI54TkDWA==",
+      "license": "MIT",
       "dependencies": {
-        "inherits": "^2.0.1",
-        "safe-buffer": "^5.0.1"
+        "inherits": "^2.0.4",
+        "safe-buffer": "^5.2.1",
+        "to-buffer": "^1.2.2"
+      },
+      "engines": {
+        "node": ">= 0.10"
       }
     },
+    "node_modules/cipher-base/node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/classnames": {
       "version": "2.3.2",
       "resolved": "https://registry.npmjs.org/classnames/-/classnames-2.3.2.tgz",
@@ -9247,6 +9379,23 @@
         "node": ">=6"
       }
     },
+    "node_modules/define-data-property": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/define-data-property/-/define-data-property-1.1.4.tgz",
+      "integrity": "sha512-rBMvIzlpA8v6E+SJZoo++HAYqsLrkg7MSfIinMPFhmkorw7X+dOXVJQs+QT69zGkzMyfDnIMN2Wid1+NbL3T+A==",
+      "license": "MIT",
+      "dependencies": {
+        "es-define-property": "^1.0.0",
+        "es-errors": "^1.3.0",
+        "gopd": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/define-lazy-prop": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/define-lazy-prop/-/define-lazy-prop-2.0.0.tgz",
@@ -9562,6 +9711,20 @@
         "url": "https://github.com/fb55/domutils?sponsor=1"
       }
     },
+    "node_modules/dunder-proto": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
+      "integrity": "sha512-KIN/nDJBQRcXw0MLVhZE9iQHmG68qAVIBg9CqmUYjmQIhgij9U5MFvrqkUL5FbtyyzZuOeOt0zdeRe4UY7ct+A==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bind-apply-helpers": "^1.0.1",
+        "es-errors": "^1.3.0",
+        "gopd": "^1.2.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/duplexer": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.2.tgz",
@@ -9599,6 +9762,7 @@
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.11.tgz",
       "integrity": "sha512-nagl3RYrbNv6kQkeJIpt6NJZy8twLB/2vtz6yN9Z4vRKHN4/QZJIEbqohALSgwKdnksuY3k5Addp5lg8sVoVcQ==",
+      "license": "Apache-2.0",
       "dependencies": {
         "safe-buffer": "^5.0.1"
       }
@@ -9616,9 +9780,10 @@
       "dev": true
     },
     "node_modules/elliptic": {
-      "version": "6.5.4",
-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
-      "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
+      "version": "6.6.1",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.6.1.tgz",
+      "integrity": "sha512-RaddvvMatK2LJHqFJ+YA4WysVN5Ita9E35botqIYspQ4TkRAlCicdzKOjlyv/1Za5RyTNn7di//eEV0uTAfe3g==",
+      "license": "MIT",
       "dependencies": {
         "bn.js": "^4.11.9",
         "brorand": "^1.1.0",
@@ -9822,12 +9987,42 @@
         "is-arrayish": "^0.2.1"
       }
     },
+    "node_modules/es-define-property": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/es-define-property/-/es-define-property-1.0.1.tgz",
+      "integrity": "sha512-e3nRfgfUZ4rNGL232gUgX06QNyyez04KdjFrF+LTRoOXmrOgFKDg4BCdsjW8EnT69eqdYGmRpJwiPVYNrCaW3g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/es-errors": {
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       "integrity": "sha512-pDo3lu8Jhfjqls6GkMgpahsF9kCyayhgykjyLMNFTKWrpVdAQtYyB4muAMWozBB4ig/dtWAmsMxLEI8wuz+DYQ=="
     },
-    "lodash.isinteger": {
-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/lodash.isinteger/-/lodash.isinteger-4.0.4.tgz",
-      "integrity": "sha512-DBwtEWN2caHQ9/imiNeEA5ys1JoRtRfY3d7V9wkqtbycnAmTvRRmbHKDV4a0EYc678/dia0jrte4tjYwVBaZUA=="
-    },
-    "lodash.isnumber": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/lodash.isnumber/-/lodash.isnumber-3.0.3.tgz",
-      "integrity": "sha512-QYqzpfwO3/CWf3XP+Z+tkQsfaLL/EnUlXWVkIk5FUPc4sBdTehEqZONuyRt2P67PXAk+NXmTBcc97zw9t1FQrw=="
-    },
-    "lodash.isplainobject": {
-      "version": "4.0.6",
-      "resolved": "https://registry.npmjs.org/lodash.isplainobject/-/lodash.isplainobject-4.0.6.tgz",
-      "integrity": "sha512-oSXzaWypCMHkPC3NvBEaPHf0KsA5mvPrOPgQWDsbg8n7orZ290M0BmC/jgRZ4vcJ6DTAhjrsSYgdsW/F+MFOBA=="
-    },
-    "lodash.isstring": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/lodash.isstring/-/lodash.isstring-4.0.1.tgz",
-      "integrity": "sha512-0wJxfxH1wgO3GrbuP+dTTk7op+6L41QCXbGINEmD+ny/G/eCqGzxyCsh7159S+mgDDcoarnBw6PC1PS5+wUGgw=="
-    },
-    "lodash.once": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/lodash.once/-/lodash.once-4.1.1.tgz",
-      "integrity": "sha512-Sb487aTOCr9drQVL8pIxOzVhafOjZN9UU54hiN8PU3uAiSV7lx1yYNpbNmex2PK6dSJoNTSJUUswT651yww3Mg=="
-    },
     "log-symbols": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/log-symbols/-/log-symbols-4.1.0.tgz",
@@ -29732,6 +30263,11 @@
       "integrity": "sha512-C0X0KQmGm3N2ftbTGBhSyuydQ+vV1LC3f3zPvT3RXHXNZrvfPZcoXp/N5DOa8vedX/rTMm2CjTtivFg2STJMRQ==",
       "dev": true
     },
+    "math-intrinsics": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
+      "integrity": "sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g=="
+    },
     "mcl-wasm": {
       "version": "0.7.9",
       "resolved": "https://registry.npmjs.org/mcl-wasm/-/mcl-wasm-0.7.9.tgz",
@@ -30761,15 +31297,32 @@
       }
     },
     "parse-asn1": {
-      "version": "5.1.6",
-      "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.6.tgz",
-      "integrity": "sha512-RnZRo1EPU6JBnra2vGHj0yhp6ebyjBZpmUCLHWiFhxlzvBCCpAuZ7elsBp1PVAbQN0/04VD/19rfzlBSwLstMw==",
+      "version": "5.1.9",
+      "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.9.tgz",
+      "integrity": "sha512-fIYNuZ/HastSb80baGOuPRo1O9cf4baWw5WsAp7dBuUzeTD/BoaG8sVTdlPFksBE2lF21dN+A1AnrpIjSWqHHg==",
       "requires": {
-        "asn1.js": "^5.2.0",
-        "browserify-aes": "^1.0.0",
-        "evp_bytestokey": "^1.0.0",
-        "pbkdf2": "^3.0.3",
-        "safe-buffer": "^5.1.1"
+        "asn1.js": "^4.10.1",
+        "browserify-aes": "^1.2.0",
+        "evp_bytestokey": "^1.0.3",
+        "pbkdf2": "3.1.6",
+        "safe-buffer": "^5.2.1"
+      },
+      "dependencies": {
+        "asn1.js": {
+          "version": "4.10.1",
+          "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
+          "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
+          "requires": {
+            "bn.js": "^4.0.0",
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+        }
       }
     },
     "parse-json": {
@@ -30894,15 +31447,23 @@
       }
     },
     "pbkdf2": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/pbkdf2/-/pbkdf2-3.1.2.tgz",
-      "integrity": "sha512-iuh7L6jA7JEGu2WxDwtQP1ddOpaJNC4KlDEFfdQajSGgGPNi4OyDc2R7QnbY2bR9QjBVGwgvTdNJZoE7RaxUMA==",
+      "version": "3.1.6",
+      "resolved": "https://registry.npmjs.org/pbkdf2/-/pbkdf2-3.1.6.tgz",
+      "integrity": "sha512-BT6eelPB1EyGHo8pC0o9Bl6k6SYVhKO1jEbd3lcTrtr7XHdjP8BW1YpfCV3G9Kwkxgattk+S5q2/RvuttCsS1g==",
       "requires": {
-        "create-hash": "^1.1.2",
-        "create-hmac": "^1.1.4",
-        "ripemd160": "^2.0.1",
-        "safe-buffer": "^5.0.1",
-        "sha.js": "^2.4.8"
+        "create-hash": "^1.2.0",
+        "create-hmac": "^1.1.7",
+        "ripemd160": "^2.0.3",
+        "safe-buffer": "^5.2.1",
+        "sha.js": "2.4.12",
+        "to-buffer": "^1.2.2"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+        }
       }
     },
     "performance-now": {
@@ -31002,6 +31563,11 @@
       "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-5.0.0.tgz",
       "integrity": "sha512-40QW5YalBNfQo5yRYmiw7Yz6TKKVr3h6970B2YE+3fQpsWcrbj1PzJgxeJ19DRQjhMbKPIuMY8rFaXc8moolVw=="
     },
+    "possible-typed-array-names": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/possible-typed-array-names/-/possible-typed-array-names-1.1.0.tgz",
+      "integrity": "sha512-/+5VFTchJDoVj3bhoqi6UeymcD00DAwb1nJwamzPvHEszJ4FpF6SNNbUbOS8yI56qHzdV8eK0qEfOSiodkTdxg=="
+    },
     "postcss": {
       "version": "8.4.21",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.21.tgz",
@@ -31974,12 +32540,12 @@
       }
     },
     "ripemd160": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/ripemd160/-/ripemd160-2.0.2.tgz",
-      "integrity": "sha512-ii4iagi25WusVoiC4B4lq7pbXfAp3D9v5CwfkY33vffw2+pkDjY1D8GaN7spsxvCSx8dkPqOZCEZyfxcmJG2IA==",
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/ripemd160/-/ripemd160-2.0.3.tgz",
+      "integrity": "sha512-5Di9UC0+8h1L6ZD2d7awM7E/T4uA1fJRlx6zk/NvdCCVEoAnFqvHmCuNeIKoCeIixBX/q8uM+6ycDvF8woqosA==",
       "requires": {
-        "hash-base": "^3.0.0",
-        "inherits": "^2.0.1"
+        "hash-base": "^3.1.2",
+        "inherits": "^2.0.4"
       }
     },
     "rlp": {
@@ -32149,16 +32715,6 @@
       "resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-3.0.1.tgz",
       "integrity": "sha512-cdwTTnqPu0Hyvf5in5asVdZocVDTNRmR7XEcJuIzMjJeSHybHl7vpB66AzwTaIg6CLSbtjcxc8fqcySfnTkccA=="
     },
-    "secp256k1": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/secp256k1/-/secp256k1-4.0.3.tgz",
-      "integrity": "sha512-NLZVf+ROMxwtEj3Xa562qgv2BK5e2WNmXPiOdVIPLgs6lyTzMvBq0aWTYMI5XCP9jZMVKOcqZLw/Wc4vDkuxhA==",
-      "requires": {
-        "elliptic": "^6.5.4",
-        "node-addon-api": "^2.0.0",
-        "node-gyp-build": "^4.2.0"
-      }
-    },
     "select-hose": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/select-hose/-/select-hose-2.0.0.tgz",
@@ -32430,6 +32986,19 @@
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
       "integrity": "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw=="
     },
+    "set-function-length": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/set-function-length/-/set-function-length-1.2.2.tgz",
+      "integrity": "sha512-pgRc4hJ4/sNjWCSS9AmnS40x3bNMDTknHgL5UaMBTMyJnU90EgWh1Rz+MC9eFu4BuN/UwZjKQuY/1v3rM7HMfg==",
+      "requires": {
+        "define-data-property": "^1.1.4",
+        "es-errors": "^1.3.0",
+        "function-bind": "^1.1.2",
+        "get-intrinsic": "^1.2.4",
+        "gopd": "^1.0.1",
+        "has-property-descriptors": "^1.0.2"
+      }
+    },
     "setimmediate": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
@@ -32442,12 +33011,20 @@
       "dev": true
     },
     "sha.js": {
-      "version": "2.4.11",
-      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
-      "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
+      "version": "2.4.12",
+      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.12.tgz",
+      "integrity": "sha512-8LzC5+bvI45BjpfXU8V5fdU2mfeKiQe1D1gIMn7XUlF3OTUrpdJpPPH4EMAnF0DsHHdSZqCdSss5qCmJKuiO3w==",
       "requires": {
-        "inherits": "^2.0.1",
-        "safe-buffer": "^5.0.1"
+        "inherits": "^2.0.4",
+        "safe-buffer": "^5.2.1",
+        "to-buffer": "^1.2.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+        }
       }
     },
     "sha256": {
@@ -33145,6 +33722,28 @@
         "os-tmpdir": "~1.0.2"
       }
     },
+    "to-buffer": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.2.2.tgz",
+      "integrity": "sha512-db0E3UJjcFhpDhAF4tLo03oli3pwl3dbnzXOUIlRKrp+ldk/VUxzpWYZENsw2SZiuBjHAk7DfB0VU7NKdpb6sw==",
+      "requires": {
+        "isarray": "^2.0.5",
+        "safe-buffer": "^5.2.1",
+        "typed-array-buffer": "^1.0.3"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.5.tgz",
+          "integrity": "sha512-xHjhDr3cNBK0BzdUJSPXZntQUx/mwMS5Rw4A7lPJ90XGAO6ISP/ePDNuo0vhqOZU+UD5JoodwCAAoZQd3FeAKw=="
+        },
+        "safe-buffer": {
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+        }
+      }
+    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -33352,6 +33951,16 @@
         "mime-types": "~2.1.24"
       }
     },
+    "typed-array-buffer": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/typed-array-buffer/-/typed-array-buffer-1.0.3.tgz",
+      "integrity": "sha512-nAYYwfY3qnzX30IkA6AQZjVbtK6duGontcQm1WSG1MD94YLqK0515GNApXkoxKOWMusVssAHWLh9SeaoefYFGw==",
+      "requires": {
+        "call-bound": "^1.0.3",
+        "es-errors": "^1.3.0",
+        "is-typed-array": "^1.1.14"
+      }
+    },
     "typed-assert": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/typed-assert/-/typed-assert-1.0.9.tgz",
@@ -33959,16 +34568,17 @@
       "integrity": "sha512-iBdZ57RDvnOR9AGBhML2vFZf7h8vmBjhoaZqODJBFWHVtKkDmKuHai3cx5PgVMrX5YDNp27AofYbAwctSS+vhQ=="
     },
     "which-typed-array": {
-      "version": "1.1.9",
-      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.9.tgz",
-      "integrity": "sha512-w9c4xkx6mPidwp7180ckYWfMmvxpjlZuIudNtDf4N/tTAUB8VJbX25qZoAsrtGuYNnGw3pa0AXgbGKRB8/EceA==",
-      "requires": {
-        "available-typed-arrays": "^1.0.5",
-        "call-bind": "^1.0.2",
-        "for-each": "^0.3.3",
-        "gopd": "^1.0.1",
-        "has-tostringtag": "^1.0.0",
-        "is-typed-array": "^1.1.10"
+      "version": "1.1.22",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.22.tgz",
+      "integrity": "sha512-fvO4ExWMFsqyhG3AiPAObMuY1lxaqgYcxbc49CNdWDDECOJNgQyvsOWVwbZc+qf3rzRtxojBK+CMEv0Ld5CYpw==",
+      "requires": {
+        "available-typed-arrays": "^1.0.7",
+        "call-bind": "^1.0.9",
+        "call-bound": "^1.0.4",
+        "for-each": "^0.3.5",
+        "get-proto": "^1.0.1",
+        "gopd": "^1.2.0",
+        "has-tostringtag": "^1.0.2"
       }
     },
     "wide-align": {
diff --git a/package.json b/package.json
index b7980733..44c49904 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,8 @@
     "format": "npx prettier --write src",
     "prepare": "husky install",
     "pre-commit": "tsc --noEmit && pretty-quick --staged",
-    "quality-check": "tsc --noEmit && npx prettier --check src"
+    "quality-check": "tsc --noEmit && npx prettier --check src",
+    "test_signing_ci": "ng test --watch=false --browsers=ChromeHeadless --include=src/app/signing.service.spec.ts"
   },
   "private": true,
   "dependencies": {
@@ -44,16 +45,16 @@
     "bip39": "^3.0.3",
     "crypto-browserify": "^3.12.0",
     "currency-symbol-map": "^5.0.1",
-    "elliptic": "^6.5.4",
+    "elliptic": "6.6.1",
     "ethereumjs-tx": "^2.1.2",
     "ethereumjs-util": "^7.1.4",
     "ethers": "^5.6.9",
     "feather-icons": "^4.29.0",
     "hdkey": "github:deso-protocol/hdkey",
     "intl-tel-input": "^18.1.7",
-    "jsonwebtoken": "^8.5.1",
+    "jws": "4.0.1",
     "key-encoder": "^2.0.3",
-    "lodash": "^4.17.21",
+    "lodash": "4.18.1",
     "ng-hcaptcha": "^2.2.0",
     "ngx-cookie": "^6.0.1",
     "process": "^0.11.10",
@@ -82,7 +83,7 @@
     "@types/hdkey": "^0.7.1",
     "@types/intl-tel-input": "^18.1.0",
     "@types/jasmine": "~3.8.0",
-    "@types/jsonwebtoken": "^8.5.1",
+    "@types/jws": "3.2.11",
     "@types/node": "^12.11.1",
     "@types/readable-stream": "^2.3.14",
     "@types/reflect-metadata": "^0.1.0",
@@ -104,6 +105,14 @@
     "tslint": "~6.1.0",
     "typescript": "~5.1.6"
   },
+  "overrides": {
+    "elliptic": "$elliptic",
+    "browserify-sign": "4.2.6",
+    "cipher-base": "1.0.7",
+    "pbkdf2": "3.1.6",
+    "secp256k1": "4.0.3",
+    "sha.js": "2.4.12"
+  },
   "volta": {
     "node": "16.19.0",
     "npm": "7.24.2"
diff --git a/src/app/account.service.ts b/src/app/account.service.ts
index 41bfa898..976bbc0a 100644
--- a/src/app/account.service.ts
+++ b/src/app/account.service.ts
@@ -3,7 +3,6 @@ import assert from 'assert';
 import bs58check from 'bs58check';
 import { ec as EC } from 'elliptic';
 import HDKey from 'hdkey';
-import * as jsonwebtoken from 'jsonwebtoken';
 import KeyEncoder from 'key-encoder';
 import sha256 from 'sha256';
 import { generateAccountNumber } from '../lib/account-number';
@@ -14,6 +13,7 @@ import {
 } from '../lib/deso/transaction';
 import * as ecies from '../lib/ecies';
 import { SwalHelper } from '../lib/helpers/swal-helper';
+import { signJwtES256 } from '../lib/jwt';
 import {
   AccessLevel,
   DefaultKeyPrivateInfo,
@@ -489,10 +489,7 @@ export class AccountService {
       'raw',
       'pem'
     );
-    const jwt = jsonwebtoken.sign({ appPublicKey }, encodedPrivateKey, {
-      algorithm: 'ES256',
-      expiresIn: '30 minutes',
-    });
+    const jwt = signJwtES256({ appPublicKey }, encodedPrivateKey, '30 minutes');
     return {
       publicKey,
       appPublicKey,
diff --git a/src/app/shared-secret/shared-secret.component.ts b/src/app/shared-secret/shared-secret.component.ts
index c9477f33..1aab7592 100644
--- a/src/app/shared-secret/shared-secret.component.ts
+++ b/src/app/shared-secret/shared-secret.component.ts
@@ -4,8 +4,8 @@ import { BackendAPIService } from '../backend-api.service';
 import { CryptoService } from '../crypto.service';
 import { GlobalVarsService } from '../global-vars.service';
 import KeyEncoder from 'key-encoder';
-import * as jsonwebtoken from 'jsonwebtoken';
 import { HttpParams } from '@angular/common/http';
+import { verifyJwtES256 } from '../../lib/jwt';
 
 @Component({
   selector: 'app-shared-secret',
@@ -70,9 +70,7 @@ export class SharedSecretComponent implements OnInit {
           'raw',
           'pem'
         );
-        const decoded = jsonwebtoken.verify(JWT, encodedPublicKey, {
-          algorithms: ['ES256'],
-        });
+        verifyJwtES256(JWT, encodedPublicKey);
       } catch (e) {
         console.error(e);
         this.errorMsg = 'Failed to verify JWT';
diff --git a/src/app/signing.service.spec.ts b/src/app/signing.service.spec.ts
index cf5965b4..6efcc2f7 100644
--- a/src/app/signing.service.spec.ts
+++ b/src/app/signing.service.spec.ts
@@ -1,16 +1,154 @@
 import { TestBed } from '@angular/core/testing';
+import { ec } from 'elliptic';
+import KeyEncoder from 'key-encoder';
 
+import { verifyJwtES256 } from '../lib/jwt';
+import { CryptoService } from './crypto.service';
+import { GlobalVarsService } from './global-vars.service';
 import { SigningService } from './signing.service';
 
 describe('SigningService', () => {
   let service: SigningService;
+  let cryptoService: jasmine.SpyObj<CryptoService>;
+  let keyPair: ec.KeyPair;
 
   beforeEach(() => {
-    TestBed.configureTestingModule({});
+    keyPair = new ec('secp256k1').keyFromPrivate('01'.padStart(64, '0'));
+    cryptoService = jasmine.createSpyObj<CryptoService>('CryptoService', [
+      'seedHexToKeyPair',
+    ]);
+    cryptoService.seedHexToKeyPair.and.returnValue(keyPair);
+
+    TestBed.configureTestingModule({
+      providers: [
+        SigningService,
+        { provide: CryptoService, useValue: cryptoService },
+        { provide: GlobalVarsService, useValue: {} },
+      ],
+    });
     service = TestBed.inject(SigningService);
   });
 
   it('should be created', () => {
     expect(service).toBeTruthy();
   });
+
+  it('produces verifiable ES256 JWTs after dependency remediation', () => {
+    const token = service.signJWT('test-only-seed', false, { expiration: 60 });
+    const keyEncoder = new KeyEncoder('secp256k1');
+    const encodedPublicKey = keyEncoder.encodePublic(
+      keyPair.getPublic('hex'),
+      'raw',
+      'pem'
+    );
+    const payload = verifyJwtES256(token, encodedPublicKey);
+
+    expect(token.split('.').length).toBe(3);
+    expect(payload.exp - payload.iat).toBe(60);
+    expect(() =>
+      verifyJwtES256(token, encodedPublicKey, payload.exp)
+    ).toThrowError('JWT claims are invalid or expired');
+  });
+
+  it('signs a valid 32-byte hash after converting it to a Buffer', () => {
+    const hashHex = 'ab'.repeat(32);
+    const signSpy = spyOn(keyPair, 'sign').and.callThrough();
+
+    const [signatureHex] = service.signHashes('test-only-seed', [hashHex]);
+
+    const signedValue = signSpy.calls.mostRecent().args[0];
+    expect(Buffer.isBuffer(signedValue)).toBeTrue();
+    expect((signedValue as Buffer).length).toBe(32);
+    expect(
+      keyPair.verify(Buffer.from(hashHex, 'hex'), signatureHex)
+    ).toBeTrue();
+  });
+
+  it('accepts uppercase hexadecimal hashes', () => {
+    const hashHex = 'AB'.repeat(32);
+
+    const [signatureHex] = service.signHashes('test-only-seed', [hashHex]);
+
+    expect(
+      keyPair.verify(Buffer.from(hashHex, 'hex'), signatureHex)
+    ).toBeTrue();
+  });
+
+  it('validates Ethereum hashes and signs the decoded Buffer', () => {
+    const hashHex = 'cd'.repeat(32);
+    const signSpy = spyOn(keyPair, 'sign').and.callThrough();
+
+    const [signature] = service.signHashesETH('test-only-seed', [hashHex]);
+
+    const signedValue = signSpy.calls.mostRecent().args[0];
+    expect(Buffer.isBuffer(signedValue)).toBeTrue();
+    expect((signedValue as Buffer).length).toBe(32);
+    expect(signature.r).toMatch(/^0x[0-9a-f]+$/);
+    expect(signature.s).toMatch(/^0x[0-9a-f]+$/);
+    expect(signature.v === 0 || signature.v === 1).toBeTrue();
+  });
+
+  it('rejects non-array requests before accessing the private key', () => {
+    const invalidRequests: unknown[] = [
+      null,
+      undefined,
+      'ab'.repeat(32),
+      123,
+      {},
+    ];
+
+    for (const invalidRequest of invalidRequests) {
+      expect(() =>
+        service.signHashes('test-only-seed', invalidRequest)
+      ).toThrowError('Unsigned hashes must be an array');
+    }
+    expect(cryptoService.seedHexToKeyPair).not.toHaveBeenCalled();
+  });
+
+  it('rejects empty and unreasonably large signing requests', () => {
+    expect(() => service.signHashes('test-only-seed', [])).toThrowError(
+      'At least one unsigned hash is required'
+    );
+    expect(() =>
+      service.signHashes(
+        'test-only-seed',
+        Array.from({ length: 1001 }, () => 'ab'.repeat(32))
+      )
+    ).toThrowError('A maximum of 1000 hashes may be signed at once');
+    expect(cryptoService.seedHexToKeyPair).not.toHaveBeenCalled();
+  });
+
+  it('rejects malformed hash values before accessing the private key', () => {
+    const malformedHashes: unknown[] = [
+      '',
+      'ab'.repeat(31),
+      'ab'.repeat(33),
+      'a'.repeat(63),
+      'zz'.repeat(32),
+      `-${'01'.repeat(32)}`,
+      123,
+      null,
+      ['ab'.repeat(32)],
+      { length: -32 },
+      '０１'.repeat(32),
+    ];
+
+    for (const malformedHash of malformedHashes) {
+      expect(() =>
+        service.signHashes('test-only-seed', [malformedHash])
+      ).toThrowError(
+        'Unsigned hash at index 0 must be exactly 32 bytes encoded as hexadecimal'
+      );
+    }
+    expect(cryptoService.seedHexToKeyPair).not.toHaveBeenCalled();
+  });
+
+  it('applies the same validation to Ethereum signing', () => {
+    expect(() =>
+      service.signHashesETH('test-only-seed', [`-${'01'.repeat(32)}`])
+    ).toThrowError(
+      'Unsigned hash at index 0 must be exactly 32 bytes encoded as hexadecimal'
+    );
+    expect(cryptoService.seedHexToKeyPair).not.toHaveBeenCalled();
+  });
 });
diff --git a/src/app/signing.service.ts b/src/app/signing.service.ts
index b1ad64d3..dccd6982 100644
--- a/src/app/signing.service.ts
+++ b/src/app/signing.service.ts
@@ -1,11 +1,11 @@
 import { Injectable } from '@angular/core';
 import { ec } from 'elliptic';
-import * as jsonwebtoken from 'jsonwebtoken';
 import KeyEncoder from 'key-encoder';
 import * as sha256 from 'sha256';
 import { uvarint64ToBuf } from '../lib/bindata/util';
 import { TransactionV0 } from '../lib/deso/transaction';
 import * as ecies from '../lib/ecies';
+import { signJwtES256 } from '../lib/jwt';
 import { CryptoService } from './crypto.service';
 import { GlobalVarsService } from './global-vars.service';
 
@@ -13,6 +13,10 @@ import { GlobalVarsService } from './global-vars.service';
   providedIn: 'root',
 })
 export class SigningService {
+  private static readonly HASH_LENGTH_BYTES = 32;
+  private static readonly MAX_HASHES_PER_REQUEST = 1000;
+  private static readonly HASH_HEX_PATTERN = /^[0-9a-fA-F]{64}$/;
+
   constructor(
     private cryptoService: CryptoService,
     private globalVars: GlobalVarsService
@@ -38,19 +42,16 @@ export class SigningService {
           this.globalVars.network
         );
 
-      return jsonwebtoken.sign(
+      return signJwtES256(
         {
           [this.globalVars.claimJwtDerivedPublicKey]:
             derivedPublicKeyBase58Check,
         },
         encodedPrivateKey,
-        { algorithm: 'ES256', expiresIn: expiration }
+        expiration
       );
     } else {
-      return jsonwebtoken.sign({}, encodedPrivateKey, {
-        algorithm: 'ES256',
-        expiresIn: expiration,
-      });
+      return signJwtES256({}, encodedPrivateKey, expiration);
     }
   }
 
@@ -88,13 +89,14 @@ export class SigningService {
     ]).toString('hex');
   }
 
-  signHashes(seedHex: string, unsignedHashes: string[]): string[] {
+  signHashes(seedHex: string, unsignedHashes: unknown): string[] {
+    const hashBuffers = this.validateUnsignedHashes(unsignedHashes);
     const privateKey = this.cryptoService.seedHexToKeyPair(seedHex);
-    const signedHashes = [];
+    const signedHashes: string[] = [];
 
-    for (const unsignedHash of unsignedHashes) {
-      const signature = privateKey.sign(unsignedHash);
-      const signatureBytes = new Buffer(signature.toDER());
+    for (const hashBuffer of hashBuffers) {
+      const signature = privateKey.sign(hashBuffer);
+      const signatureBytes = Buffer.from(signature.toDER());
       signedHashes.push(signatureBytes.toString('hex'));
     }
 
@@ -103,13 +105,14 @@ export class SigningService {
 
   signHashesETH(
     seedHex: string,
-    unsignedHashes: string[]
+    unsignedHashes: unknown
   ): { s: any; r: any; v: number | null }[] {
+    const hashBuffers = this.validateUnsignedHashes(unsignedHashes);
     const privateKey = this.cryptoService.seedHexToKeyPair(seedHex);
     const signedHashes = [];
 
-    for (const unsignedHash of unsignedHashes) {
-      const signature = privateKey.sign(unsignedHash, { canonical: true });
+    for (const hashBuffer of hashBuffers) {
+      const signature = privateKey.sign(hashBuffer, { canonical: true });
 
       signedHashes.push({
         s: '0x' + signature.s.toString('hex'),
@@ -121,6 +124,39 @@ export class SigningService {
     return signedHashes;
   }
 
+  private validateUnsignedHashes(unsignedHashes: unknown): Buffer[] {
+    if (!Array.isArray(unsignedHashes)) {
+      throw new Error('Unsigned hashes must be an array');
+    }
+    if (unsignedHashes.length === 0) {
+      throw new Error('At least one unsigned hash is required');
+    }
+    if (unsignedHashes.length > SigningService.MAX_HASHES_PER_REQUEST) {
+      throw new Error(
+        `A maximum of ${SigningService.MAX_HASHES_PER_REQUEST} hashes may be signed at once`
+      );
+    }
+
+    return unsignedHashes.map((unsignedHash, index) => {
+      if (
+        typeof unsignedHash !== 'string' ||
+        !SigningService.HASH_HEX_PATTERN.test(unsignedHash)
+      ) {
+        throw new Error(
+          `Unsigned hash at index ${index} must be exactly 32 bytes encoded as hexadecimal`
+        );
+      }
+
+      const hashBuffer = Buffer.from(unsignedHash, 'hex');
+      if (hashBuffer.length !== SigningService.HASH_LENGTH_BYTES) {
+        throw new Error(
+          `Unsigned hash at index ${index} must decode to exactly 32 bytes`
+        );
+      }
+      return hashBuffer;
+    });
+  }
+
   encryptGroupMessagingPrivateKeyToMember(
     memberMessagingPublicKeyBase58Check: string,
     privateKeyHex: string
diff --git a/src/lib/jwt.ts b/src/lib/jwt.ts
new file mode 100644
index 00000000..edad63c5
--- /dev/null
+++ b/src/lib/jwt.ts
@@ -0,0 +1,92 @@
+import * as jws from 'jws';
+
+const JWT_ALGORITHM = 'ES256';
+const JWT_TYPE = 'JWT';
+const EXPIRATION_PATTERN =
+  /^\s*(\d+(?:\.\d+)?)\s*(seconds?|minutes?|hours?|days?)\s*$/i;
+const SECONDS_PER_UNIT: Record<string, number> = {
+  second: 1,
+  seconds: 1,
+  minute: 60,
+  minutes: 60,
+  hour: 60 * 60,
+  hours: 60 * 60,
+  day: 24 * 60 * 60,
+  days: 24 * 60 * 60,
+};
+
+export interface JwtPayload {
+  [claim: string]: unknown;
+  exp: number;
+  iat: number;
+}
+
+export function signJwtES256(
+  payload: Record<string, unknown>,
+  encodedPrivateKey: string,
+  expiresIn: string | number
+): string {
+  const issuedAt = Math.floor(Date.now() / 1000);
+  const expirationSeconds = parseExpirationSeconds(expiresIn);
+
+  return jws.sign({
+    header: { alg: JWT_ALGORITHM, typ: JWT_TYPE },
+    payload: JSON.stringify({
+      ...payload,
+      iat: issuedAt,
+      exp: issuedAt + expirationSeconds,
+    }),
+    privateKey: encodedPrivateKey,
+  });
+}
+
+export function verifyJwtES256(
+  token: string,
+  encodedPublicKey: string,
+  nowSeconds = Math.floor(Date.now() / 1000)
+): JwtPayload {
+  const decoded = jws.decode(token, { json: true });
+  if (
+    !decoded ||
+    decoded.header?.alg !== JWT_ALGORITHM ||
+    decoded.header?.typ !== JWT_TYPE
+  ) {
+    throw new Error('JWT must use ES256');
+  }
+  if (!jws.verify(token, JWT_ALGORITHM, encodedPublicKey)) {
+    throw new Error('JWT signature is invalid');
+  }
+
+  const payload = decoded.payload as Partial<JwtPayload>;
+  if (
+    !payload ||
+    typeof payload !== 'object' ||
+    !Number.isSafeInteger(payload.iat) ||
+    !Number.isSafeInteger(payload.exp) ||
+    (payload.exp as number) <= nowSeconds
+  ) {
+    throw new Error('JWT claims are invalid or expired');
+  }
+
+  return payload as JwtPayload;
+}
+
+function parseExpirationSeconds(expiresIn: string | number): number {
+  if (typeof expiresIn === 'number') {
+    if (!Number.isSafeInteger(expiresIn) || expiresIn <= 0) {
+      throw new Error('JWT expiration must be a positive integer');
+    }
+    return expiresIn;
+  }
+
+  const match = EXPIRATION_PATTERN.exec(expiresIn);
+  if (!match) {
+    throw new Error('JWT expiration format is invalid');
+  }
+  const value = Number(match[1]);
+  const seconds = value * SECONDS_PER_UNIT[match[2].toLowerCase()];
+  if (!Number.isSafeInteger(seconds) || seconds <= 0) {
+    throw new Error('JWT expiration must resolve to whole positive seconds');
+  }
+  return seconds;
+}
diff --git a/src/test.ts b/src/test.ts
index 3a11a893..9e1b0e17 100644
--- a/src/test.ts
+++ b/src/test.ts
@@ -1,4 +1,4 @@
-// This file is required by karma.conf.js and loads recursively all the .spec and framework files
+// This file is required by karma.conf.js and initializes the Angular test environment.
 
 import 'zone.js/dist/zone-testing';
 import { getTestBed } from '@angular/core/testing';
@@ -7,17 +7,6 @@ import {
   platformBrowserDynamicTesting,
 } from '@angular/platform-browser-dynamic/testing';
 
-declare const require: {
-  context(
-    path: string,
-    deep?: boolean,
-    filter?: RegExp
-  ): {
-    keys(): string[];
-    <T>(id: string): T;
-  };
-};
-
 // First, initialize the Angular testing environment.
 getTestBed().initTestEnvironment(
   BrowserDynamicTestingModule,
@@ -26,7 +15,3 @@ getTestBed().initTestEnvironment(
     teardown: { destroyAfterEach: false },
   }
 );
-// Then we find all the tests.
-const context = require.context('./', true, /\.spec\.ts$/);
-// And load the modules.
-context.keys().map(context);