diff --git a/src/claimVerification.js b/src/claimVerification.js
new file mode 100644
index 0000000..0184814
--- /dev/null
+++ b/src/claimVerification.js
@@ -0,0 +1,54 @@
+const utils = require('./utils')
+
+const runOnJson = (proofData, checkPath, checkClaim, checkRelation) => {
+  let isVerified = false, re
+
+  if (!proofData) {
+    return isVerified
+  }
+
+  if (checkPath.length == 0) {
+    switch (checkRelation) {
+      default:
+      case 'contains':
+        re = new RegExp(checkClaim, "gi")
+        return re.test(proofData.replace(/\r?\n|\r/, ''))
+        break
+      case 'equals':
+        return proofData.replace(/\r?\n|\r/, '').toLowerCase() == checkClaim.toLowerCase()
+        break
+      case 'oneOf':
+        re = new RegExp(checkClaim, "gi")
+        return re.test(proofData.join("|"))
+        break
+    }
+  }
+
+  if (Array.isArray(proofData)) {
+    proofData.forEach((item, i) => {
+      isVerified = isVerified || runOnJson(item, checkPath, checkClaim, checkRelation)
+    });
+  } else if (Array.isArray(proofData[checkPath[0]])) {
+    proofData[checkPath[0]].forEach((item, i) => {
+      isVerified = isVerified || runOnJson(item, checkPath.slice(1), checkClaim, checkRelation)
+    })
+  } else {
+    isVerified = isVerified || runOnJson(proofData[checkPath[0]], checkPath.slice(1), checkClaim, checkRelation)
+  }
+
+  return isVerified;
+}
+
+const run = (proofData, spData) => {
+  switch (spData.proof.format) {
+    case 'json':
+      return runOnJson(proofData, spData.claim.path, utils.generateClaim(spData), spData.claim.relation)
+      break
+    case 'text':
+      re = new RegExp(utils.generateClaim(spData), "gi")
+      return re.test(proofData.replace(/\r?\n|\r/, ''))
+      break
+  }
+}
+
+exports.run = run