diff --git a/lib/onTransaction.mjs b/lib/onTransaction.mjs
index 58e56ec..4069f1d 100644
--- a/lib/onTransaction.mjs
+++ b/lib/onTransaction.mjs
@@ -51,13 +51,11 @@ const onTransaction = async ({
                * generate an xPOP.
                */
               setTimeout(async () => {
-                console.log(
-                  await xpop({
-                    ledgerIndex: transaction.ledger_index,
-                    networkId,
-                    txHash: tx.hash,
-                  })
-                )
+                await xpop({
+                  ledgerIndex: transaction.ledger_index,
+                  networkId,
+                  txHash: tx.hash,
+                })
               }, 500)
               //  ^^ To check: is this enough? If e.g. retrieving the ledger info
               //     would take longer this may not be enough. Best solution:
diff --git a/xpop/generateV1.mjs b/xpop/generateV1.mjs
index 95f508c..06b62fc 100644
--- a/xpop/generateV1.mjs
+++ b/xpop/generateV1.mjs
@@ -1,6 +1,6 @@
 import assert from 'assert'
 import { xpop } from './xpopV1.mjs'
-import { readFile, readdir } from 'fs'
+import { writeFile, readFile, readdir } from 'fs'
 import { ledgerIndexToFolders } from '../lib/ledgerIndexToFolders.mjs'
 import { dirExists } from '../lib/dirExists.mjs'
 
@@ -60,8 +60,19 @@ const generateV1 = async ({
         Promise.all(validationFiles.map(f => catjson(relativeStorDir + '/' + f))),
         catjson(relativeStorDir + '/tx_' + txHash + '.json'),
       ])
+
+      const xpopJson = await xpop({ vl, ledger: { json, binary, }, validations, tx, })
+      const xpopFilename = 'xpop_' + txHash + '.json'
+
+      writeFile(storeDir + '/' + xpopFilename, Buffer.from(xpopJson, 'utf8'), err => {
+        if (err) {
+          console.log('   !!!->> Error writing xpop-file @ ' + storeDir)
+        } else {
+          console.log('   ---->> xPOP stored @ ' + relativeStorDir + '/' + xpopFilename + ', strlen: ' + xpopJson.length)
+        }
+      })
       
-      return await xpop({ vl, ledger: { json, binary, }, validations, tx, })
+      return Buffer.from(xpopJson, 'utf-8').toString('hex')
     } catch (e) {
       console.log(e)
       throw new Error('Not all files required for xPOP generation found')
diff --git a/xpop/xpopV1.mjs b/xpop/xpopV1.mjs
index ecf5aa3..07be250 100644
--- a/xpop/xpopV1.mjs
+++ b/xpop/xpopV1.mjs
@@ -10,13 +10,6 @@ const xpop = async ({
   validations,
   tx,
 }) => {
-  // console.log(vl, json, binary, validations, tx)
-
-  // console.log(json)
-  // console.log(tx)
-
-  const x = {}
-
   const proof = create_proof(binary?.transactions, tx?.transaction?.hash)
   const computed_transactions_root = hash_proof(proof)
 
@@ -61,12 +54,7 @@ const xpop = async ({
     }
   }
 
-  const xpopJson = JSON.stringify(xpopObj)
-  const xpopHex = Buffer.from(xpopJson, 'utf-8').toString('hex')
-
-  // TODO: STORE
-
-  return xpopHex
+  return JSON.stringify(xpopObj)
 }
 
 export {