diff --git a/backend/api/package-lock.json b/backend/api/package-lock.json
index a0113bd..7382657 100644
--- a/backend/api/package-lock.json
+++ b/backend/api/package-lock.json
@@ -23,7 +23,8 @@
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@@ -36,6 +37,7 @@
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@@ -1065,6 +1067,22 @@
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+      "license": "GPL-3.0"
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+      "resolved": "https://registry.npmjs.org/@iden3/binfileutils/-/binfileutils-0.0.12.tgz",
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+      "license": "GPL-3.0",
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@@ -3295,6 +3313,13 @@
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+      "resolved": "https://registry.npmjs.org/@types/snarkjs/-/snarkjs-0.7.9.tgz",
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+      "license": "MIT"
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@@ -4314,6 +4339,12 @@
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@@ -4321,6 +4352,20 @@
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+      "resolved": "https://registry.npmjs.org/b4a/-/b4a-1.7.3.tgz",
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+      "license": "Apache-2.0",
+      "peerDependencies": {
+        "react-native-b4a": "*"
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@@ -4472,6 +4516,22 @@
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+        "check-types": "^11.2.3",
+        "hoopy": "^0.1.4",
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@@ -4484,6 +4544,22 @@
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+      "resolved": "https://registry.npmjs.org/blake2b-wasm/-/blake2b-wasm-2.4.0.tgz",
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+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.2.tgz",
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@@ -4800,6 +4876,12 @@
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@@ -4842,6 +4924,18 @@
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+      "resolved": "https://registry.npmjs.org/circom_runtime/-/circom_runtime-0.1.28.tgz",
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+      "license": "Apache-2.0",
+      "dependencies": {
+        "ffjavascript": "0.3.1"
+      },
+      "bin": {
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@@ -5463,6 +5556,21 @@
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+      "dependencies": {
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+        "ejs": "bin/cli.js"
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@@ -5613,6 +5721,97 @@
         "url": "https://github.com/sponsors/sindresorhus"
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+      "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-1.14.3.tgz",
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+        "estraverse": "^4.2.0",
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+      "bin": {
+        "escodegen": "bin/escodegen.js",
+        "esgenerate": "bin/esgenerate.js"
+      },
+      "engines": {
+        "node": ">=4.0"
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+      "optionalDependencies": {
+        "source-map": "~0.6.1"
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+      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.3.0.tgz",
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+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=4.0"
+      }
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+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
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+        "type-check": "~0.3.2"
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@@ -6076,6 +6272,12 @@
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+      "resolved": "https://registry.npmjs.org/fastfile/-/fastfile-0.0.20.tgz",
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@@ -6096,6 +6298,17 @@
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+      "resolved": "https://registry.npmjs.org/ffjavascript/-/ffjavascript-0.3.1.tgz",
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+        "wasmcurves": "0.2.2",
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@@ -6133,6 +6346,36 @@
         "url": "https://github.com/sindresorhus/file-type?sponsor=1"
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@@ -7025,6 +7277,23 @@
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+      "resolved": "https://registry.npmjs.org/jake/-/jake-10.9.4.tgz",
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@@ -7810,6 +8079,12 @@
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@@ -7904,6 +8179,29 @@
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     },
+    "node_modules/jsonpath": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/jsonpath/-/jsonpath-1.1.1.tgz",
+      "integrity": "sha512-l6Cg7jRpixfbgoWgkrl77dgEj8RPvND0wMH6TwQmi9Qs4TFfS9u5cUFnbeKTwj5ga5Y3BTGGNI28k117LJ009w==",
+      "license": "MIT",
+      "dependencies": {
+        "esprima": "1.2.2",
+        "static-eval": "2.0.2",
+        "underscore": "1.12.1"
+      }
+    },
+    "node_modules/jsonpath/node_modules/esprima": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-1.2.2.tgz",
+      "integrity": "sha512-+JpPZam9w5DuJ3Q67SqsMGtiHKENSMRVoxvArfJZK01/BfLEObtZ6orJa/MtoGNR/rfMgp5837T41PAmTwAv/A==",
+      "bin": {
+        "esparse": "bin/esparse.js",
+        "esvalidate": "bin/esvalidate.js"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/jsonwebtoken": {
       "version": "9.0.2",
       "resolved": "https://registry.npmjs.org/jsonwebtoken/-/jsonwebtoken-9.0.2.tgz",
@@ -8128,6 +8426,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/logplease": {
+      "version": "1.2.15",
+      "resolved": "https://registry.npmjs.org/logplease/-/logplease-1.2.15.tgz",
+      "integrity": "sha512-jLlHnlsPSJjpwUfcNyUxXCl33AYg2cHhIf9QhGL2T4iPT0XPB+xP1LRKFPgIg1M/sg9kAJvy94w9CzBNrfnstA==",
+      "license": "MIT"
+    },
     "node_modules/long": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/long/-/long-5.3.2.tgz",
@@ -8449,6 +8753,12 @@
         "node": "^18.17.0 || >=20.5.0"
       }
     },
+    "node_modules/nanoassert": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/nanoassert/-/nanoassert-2.0.0.tgz",
+      "integrity": "sha512-7vO7n28+aYO4J+8w96AzhmU8G+Y/xpPDJz/se19ICsqj/momRbb9mh9ZUtkoJ5X3nTnPdhEJyc0qnM6yAsHBaA==",
+      "license": "ISC"
+    },
     "node_modules/napi-postinstall": {
       "version": "0.3.4",
       "resolved": "https://registry.npmjs.org/napi-postinstall/-/napi-postinstall-0.3.4.tgz",
@@ -9065,7 +9375,6 @@
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
       "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
-      "dev": true,
       "license": "ISC"
     },
     "node_modules/picomatch": {
@@ -9390,6 +9699,29 @@
       ],
       "license": "MIT"
     },
+    "node_modules/r1csfile": {
+      "version": "0.0.48",
+      "resolved": "https://registry.npmjs.org/r1csfile/-/r1csfile-0.0.48.tgz",
+      "integrity": "sha512-kHRkKUJNaor31l05f2+RFzvcH5XSa7OfEfd/l4hzjte6NL6fjRkSMfZ4BjySW9wmfdwPOtq3mXurzPvPGEf5Tw==",
+      "license": "GPL-3.0",
+      "dependencies": {
+        "@iden3/bigarray": "0.0.2",
+        "@iden3/binfileutils": "0.0.12",
+        "fastfile": "0.0.20",
+        "ffjavascript": "0.3.0"
+      }
+    },
+    "node_modules/r1csfile/node_modules/ffjavascript": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/ffjavascript/-/ffjavascript-0.3.0.tgz",
+      "integrity": "sha512-l7sR5kmU3gRwDy8g0Z2tYBXy5ttmafRPFOqY7S6af5cq51JqJWt5eQ/lSR/rs2wQNbDYaYlQr5O+OSUf/oMLoQ==",
+      "license": "GPL-3.0",
+      "dependencies": {
+        "wasmbuilder": "0.0.16",
+        "wasmcurves": "0.2.2",
+        "web-worker": "1.2.0"
+      }
+    },
     "node_modules/randombytes": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
@@ -9837,6 +10169,27 @@
         "node": ">=8"
       }
     },
+    "node_modules/snarkjs": {
+      "version": "0.7.5",
+      "resolved": "https://registry.npmjs.org/snarkjs/-/snarkjs-0.7.5.tgz",
+      "integrity": "sha512-h+3c4rXZKLhLuHk4LHydZCk/h5GcNvk5GjVKRRkHmfb6Ntf8gHOA9zea3g656iclRuhqQ3iKDWFgiD9ypLrKiA==",
+      "license": "GPL-3.0",
+      "dependencies": {
+        "@iden3/binfileutils": "0.0.12",
+        "bfj": "^7.0.2",
+        "blake2b-wasm": "^2.4.0",
+        "circom_runtime": "0.1.28",
+        "ejs": "^3.1.6",
+        "fastfile": "0.0.20",
+        "ffjavascript": "0.3.1",
+        "js-sha3": "^0.8.0",
+        "logplease": "^1.2.15",
+        "r1csfile": "0.0.48"
+      },
+      "bin": {
+        "snarkjs": "build/cli.cjs"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.7.4",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.4.tgz",
@@ -9898,6 +10251,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/static-eval": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/static-eval/-/static-eval-2.0.2.tgz",
+      "integrity": "sha512-N/D219Hcr2bPjLxPiV+TQE++Tsmrady7TqAJugLy7Xk1EumfDWS/f5dtBbkRCGE7wKKXuYockQoj8Rm2/pVKyg==",
+      "license": "MIT",
+      "dependencies": {
+        "escodegen": "^1.8.1"
+      }
+    },
     "node_modules/statuses": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
@@ -10480,6 +10842,12 @@
         "tree-kill": "cli.js"
       }
     },
+    "node_modules/tryer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/tryer/-/tryer-1.0.1.tgz",
+      "integrity": "sha512-c3zayb8/kWWpycWYg87P71E1S1ZL6b6IJxfb5fvsUgsf0S2MVGaDhDXXjDMpdCpfWXqptc+4mXwmiy1ypXqRAA==",
+      "license": "MIT"
+    },
     "node_modules/ts-api-utils": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.1.0.tgz",
@@ -10803,6 +11171,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/underscore": {
+      "version": "1.12.1",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.12.1.tgz",
+      "integrity": "sha512-hEQt0+ZLDVUMhebKxL4x1BTtDY7bavVofhZ9KZ4aI26X9SRaE+Y3m83XUL1UP2jn8ynjndwCCpEHdUG+9pP1Tw==",
+      "license": "MIT"
+    },
     "node_modules/undici-types": {
       "version": "6.21.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
@@ -10960,6 +11334,21 @@
         "makeerror": "1.0.12"
       }
     },
+    "node_modules/wasmbuilder": {
+      "version": "0.0.16",
+      "resolved": "https://registry.npmjs.org/wasmbuilder/-/wasmbuilder-0.0.16.tgz",
+      "integrity": "sha512-Qx3lEFqaVvp1cEYW7Bfi+ebRJrOiwz2Ieu7ZG2l7YyeSJIok/reEQCQCuicj/Y32ITIJuGIM9xZQppGx5LrQdA==",
+      "license": "GPL-3.0"
+    },
+    "node_modules/wasmcurves": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/wasmcurves/-/wasmcurves-0.2.2.tgz",
+      "integrity": "sha512-JRY908NkmKjFl4ytnTu5ED6AwPD+8VJ9oc94kdq7h5bIwbj0L4TDJ69mG+2aLs2SoCmGfqIesMWTEJjtYsoQXQ==",
+      "license": "GPL-3.0",
+      "dependencies": {
+        "wasmbuilder": "0.0.16"
+      }
+    },
     "node_modules/watchpack": {
       "version": "2.4.4",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-2.4.4.tgz",
@@ -10984,6 +11373,12 @@
         "defaults": "^1.0.3"
       }
     },
+    "node_modules/web-worker": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/web-worker/-/web-worker-1.2.0.tgz",
+      "integrity": "sha512-PgF341avzqyx60neE9DD+XS26MMNMoUQRz9NOZwW32nPQrF6p77f1htcnjBSEV8BGMKZ16choqUG4hyI0Hx7mA==",
+      "license": "Apache-2.0"
+    },
     "node_modules/webpack": {
       "version": "5.102.1",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.102.1.tgz",
@@ -11205,7 +11600,6 @@
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
       "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
diff --git a/backend/api/package.json b/backend/api/package.json
index 058a019..d7796d9 100644
--- a/backend/api/package.json
+++ b/backend/api/package.json
@@ -34,7 +34,8 @@
     "class-validator": "^0.14.2",
     "cookie-parser": "^1.4.7",
     "reflect-metadata": "^0.2.2",
-    "rxjs": "^7.8.1"
+    "rxjs": "^7.8.1",
+    "snarkjs": "^0.7.5"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.2.0",
@@ -47,6 +48,7 @@
     "@types/express": "^5.0.0",
     "@types/jest": "^30.0.0",
     "@types/node": "^22.10.7",
+    "@types/snarkjs": "^0.7.9",
     "@types/supertest": "^6.0.2",
     "eslint": "^9.18.0",
     "eslint-config-prettier": "^10.0.1",
diff --git a/backend/api/public/circuit.wasm b/backend/api/public/circuit.wasm
new file mode 100644
index 0000000..34f1b93
Binary files /dev/null and b/backend/api/public/circuit.wasm differ
diff --git a/backend/api/public/circuit_final.zkey b/backend/api/public/circuit_final.zkey
new file mode 100644
index 0000000..336882e
Binary files /dev/null and b/backend/api/public/circuit_final.zkey differ
diff --git a/backend/api/public/verification_key.json b/backend/api/public/verification_key.json
new file mode 100644
index 0000000..07129ef
--- /dev/null
+++ b/backend/api/public/verification_key.json
@@ -0,0 +1,94 @@
+{
+ "protocol": "groth16",
+ "curve": "bn128",
+ "nPublic": 1,
+ "vk_alpha_1": [
+  "11609403479684986297821122136849182347265518467393520634953937610837090068383",
+  "11959768802511739796563919829025799870232092927870306020291937903009101607475",
+  "1"
+ ],
+ "vk_beta_2": [
+  [
+   "17090447578251154026419914064962345430149475462868419947252543025241675949669",
+   "18408658598915443378893649005165159256030068053931139108248932571187351044007"
+  ],
+  [
+   "16804579781075932042665188602119064412992466510271777940650515542732921127209",
+   "12006028720789082923772127014834627423622554848010187804952527513777181756481"
+  ],
+  [
+   "1",
+   "0"
+  ]
+ ],
+ "vk_gamma_2": [
+  [
+   "10857046999023057135944570762232829481370756359578518086990519993285655852781",
+   "11559732032986387107991004021392285783925812861821192530917403151452391805634"
+  ],
+  [
+   "8495653923123431417604973247489272438418190587263600148770280649306958101930",
+   "4082367875863433681332203403145435568316851327593401208105741076214120093531"
+  ],
+  [
+   "1",
+   "0"
+  ]
+ ],
+ "vk_delta_2": [
+  [
+   "6120279401033139370483683327867251247572060847005718883273130129853439621983",
+   "6100370255035545895963173067251529799151147159376445285149549190894259201797"
+  ],
+  [
+   "8767215359143892483874904293490476249857116073700714284874259624640825781178",
+   "4300826400335387497097541710613144607911603707510243763088143787486331739494"
+  ],
+  [
+   "1",
+   "0"
+  ]
+ ],
+ "vk_alphabeta_12": [
+  [
+   [
+    "11224510553877939197800171898557239258618313757896837317784367800152977536527",
+    "15565264600370980339332904200171276945948558815133766559013795755249622496056"
+   ],
+   [
+    "14306105339653967560873615068778524236619030250278352520165433180242752102282",
+    "21839424446014350201276065288190000557486942266379740403623850213854228071376"
+   ],
+   [
+    "11482197939142602292126981919519384334085545684951886813584391845162756633812",
+    "13654392979654317203844533967321770821445657279517593970164052327590949776004"
+   ]
+  ],
+  [
+   [
+    "12283761035595192239180202231090137752321975527424117355914409647734230721565",
+    "19854972761628667322521756529742516074953948441917813735700660567587615781723"
+   ],
+   [
+    "18547903272877029171387798770308070458120867065288530646593413026527655982536",
+    "7952156481923488345239314340829334705808654100250940513935661764636213931701"
+   ],
+   [
+    "10958095832273004121994391345975203028186437742386722540411042454730754283013",
+    "16022019810399516409723346327109113983111598135692166537003172966561061275314"
+   ]
+  ]
+ ],
+ "IC": [
+  [
+   "4909160938121226941691008018895052038813461360700444321644509887286638405150",
+   "15325237508615711865302454567288962780214968756852405719827027273722867041557",
+   "1"
+  ],
+  [
+   "6789022921661388591319085906297368755634787611564597507826207323927052815061",
+   "17377994450165778938977298684635364640296014817348062491084076244590863064784",
+   "1"
+  ]
+ ]
+}
\ No newline at end of file
diff --git a/backend/api/src/modules/proof/proof.service.ts b/backend/api/src/modules/proof/proof.service.ts
index 8aa0e3c..cdde8c0 100644
--- a/backend/api/src/modules/proof/proof.service.ts
+++ b/backend/api/src/modules/proof/proof.service.ts
@@ -1,6 +1,12 @@
-import { Injectable } from '@nestjs/common';
+import {
+  Injectable,
+  InternalServerErrorException,
+  NotFoundException,
+} from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
 import { RekammedisService } from '../rekammedis/rekammedis.service';
+import { groth16, wtns } from 'snarkjs';
+import path from 'path';
 
 @Injectable()
 export class ProofService {
@@ -9,5 +15,49 @@ export class ProofService {
     private rekamMedisService: RekammedisService,
   ) {}
 
-  async getProof(id_visit: any) {}
+  buildDir = path.join(__dirname, '../../../', 'dist');
+  publicDir = path.join(__dirname, '../../../../', '/api/public');
+  wasmPath = path.join(this.publicDir, 'circuit.wasm');
+  zkeyPath = path.join(this.publicDir, 'circuit_final.zkey');
+  vkeyPath = path.join(this.publicDir, 'verification_key.json');
+  witnessPath = path.join(this.buildDir, 'witness.wtns');
+
+  async calculateWitness(age: number) {
+    const inputs = {
+      age: age,
+      threshold: 18,
+    };
+    await wtns.calculate(inputs, this.wasmPath, this.witnessPath);
+  }
+
+  async generateProof() {
+    const { proof, publicSignals } = await groth16.prove(
+      this.zkeyPath,
+      this.witnessPath,
+    );
+    return { proof, publicSignals };
+  }
+
+  async getProof(id_visit: any) {
+    const age = await this.rekamMedisService.getAgeByIdVisit(id_visit);
+    if (!age) {
+      throw new NotFoundException('ID Visit tidak ditemukan');
+    }
+
+    try {
+      await this.calculateWitness(age);
+    } catch (error) {
+      console.log('Error during witness calculation:', error);
+      throw new InternalServerErrorException(
+        "Can't generate proof from input based on constraint. Please check the input data and try again.",
+      );
+    }
+
+    const { proof, publicSignals } = await this.generateProof();
+
+    return {
+      proof: proof,
+      publicSignals: publicSignals,
+    };
+  }
 }
diff --git a/backend/api/src/modules/rekammedis/rekammedis.service.ts b/backend/api/src/modules/rekammedis/rekammedis.service.ts
index da88dad..a95275d 100644
--- a/backend/api/src/modules/rekammedis/rekammedis.service.ts
+++ b/backend/api/src/modules/rekammedis/rekammedis.service.ts
@@ -395,14 +395,21 @@ export class RekammedisService {
   }
 
   async getAgeByIdVisit(id_visit: string) {
-    const age = await this.prisma.rekam_medis.findUnique({
-      select: {
-        umur: true,
-      },
-      where: {
-        id_visit: id_visit,
-      },
-    });
+    let age: number | null = null;
+    try {
+      const result = await this.prisma.rekam_medis.findUnique({
+        select: {
+          umur: true,
+        },
+        where: {
+          id_visit: id_visit,
+        },
+      });
+      age = result?.umur ?? null;
+    } catch (error) {
+      console.error('Error getting age by id_visit:', error);
+      throw error;
+    }
     return age;
   }