diff --git a/lib/cash-in-tx.js b/lib/cash-in-tx.js
index 03cdd095..6eee0b1f 100644
--- a/lib/cash-in-tx.js
+++ b/lib/cash-in-tx.js
@@ -9,8 +9,6 @@ const mapValuesWithKey = _.mapValues.convert({cap: false})
 
 module.exports = {post, monitorPending}
 
-const UPDATEABLE_FIELDS = ['fee', 'txHash', 'phone', 'error', 'send',
-  'cryptoAtoms', 'fiat', 'timedout']
 const PENDING_INTERVAL = '1 day'
 const MAX_PENDING = 10
 
@@ -43,10 +41,11 @@ function post (tx, pi) {
 
   return db.tx(transaction)
   .then(txVector => {
-    const [oldTx, newTx, newBills] = txVector
+    const [oldTx,, newBills] = txVector
     const oldBills = oldTx ? oldTx.bills : []
+
     return postProcess(txVector, pi)
-    .then(changes => update(newTx, changes))
+    .then(changes => update(oldTx, changes))
     .then(tx => _.merge({bills: _.concat(oldBills, newBills)}, tx))
   })
 }
@@ -57,17 +56,54 @@ function nilEqual (a, b) {
   return undefined
 }
 
+function isMonotonic (oldField, newField, fieldKey) {
+  if (_.isNil(newField)) return false
+  if (_.isBoolean(oldField)) return oldField === newField || !oldField
+  if (oldField.isBigNumber) return oldField.lte(newField)
+  if (_.isNumber(oldField)) return oldField <= newField
+
+  throw new Error(`Unexpected value: ${oldField}`)
+}
+
+function ensureRatchet (oldField, newField, fieldKey) {
+  const monotonic = ['cryptoAtoms', 'fiat', 'send', 'sendConfirmed', 'operatorCompleted', 'timedout']
+  const free = ['sendPending', 'error', 'errorCode']
+
+  if (_.isNil(oldField)) return true
+  if (_.includes(fieldKey, monotonic)) return isMonotonic(oldField, newField, fieldKey)
+
+  if (_.includes(fieldKey, free)) {
+    if (_.isNil(newField)) return false
+    return true
+  }
+
+  logger.error('This field [%s] should never change', fieldKey)
+  logger.error('oldField: %j', oldField)
+  logger.error('newField: %j', newField)
+  throw new Error(`This field [${fieldKey}] should never change`)
+}
+
 function diff (oldTx, newTx) {
   let updatedTx = {}
 
-  UPDATEABLE_FIELDS.forEach(fieldKey => {
-    if (oldTx && _.isEqualWith(nilEqual, oldTx[fieldKey], newTx[fieldKey])) return
+  if (!oldTx) throw new Error('oldTx must not be null')
+  if (!newTx) throw new Error('newTx must not be null')
 
-    // We never null out an existing field
-    if (oldTx && _.isNil(newTx[fieldKey])) return
+  _.forEach(fieldKey => {
+    const oldField = oldTx[fieldKey]
+    const newField = newTx[fieldKey]
+    if (fieldKey === 'bills') return
+    if (_.isEqualWith(nilEqual, oldField, newField)) return
 
-    updatedTx[fieldKey] = newTx[fieldKey]
-  })
+    if (!ensureRatchet(oldField, newField, fieldKey)) {
+      logger.warn('Value from lamassu-machine would violate ratchet [%s]', fieldKey)
+      logger.warn('Old tx: %j', oldTx)
+      logger.warn('New tx: %j', newTx)
+      return
+    }
+
+    updatedTx[fieldKey] = newField
+  }, _.keys(newTx))
 
   return updatedTx
 }
@@ -85,6 +121,11 @@ function toObj (row) {
       return
     }
 
+    if (key === 'device_time') {
+      newObj[objKey] = parseInt(row[key], 10)
+      return
+    }
+
     newObj[objKey] = row[key]
   })
 
@@ -128,14 +169,14 @@ function insertNewBills (billRows, tx) {
   .then(() => bills)
 }
 
-function upsert (oldTx, tx) {
+function upsert (oldTx, newTx) {
   if (!oldTx) {
-    return insert(tx)
-    .then(newTx => [oldTx, newTx])
+    return insert(newTx)
+    .then(tx => [oldTx, tx])
   }
 
-  return update(tx, diff(oldTx, tx))
-  .then(newTx => [oldTx, newTx])
+  return update(oldTx, diff(oldTx, newTx))
+  .then(tx => [oldTx, tx])
 }
 
 function insert (tx) {
@@ -235,7 +276,6 @@ function monitorPending (settings) {
   }
 
   return db.any(sql, [PENDING_INTERVAL, MAX_PENDING])
-  .then(_.tap(console.log))
   .then(rows => Promise.all(_.map(processPending, rows)))
   .catch(logger.error)
 }
diff --git a/lib/plugins/sms/twilio/twilio.js b/lib/plugins/sms/twilio/twilio.js
index 76371804..d5c2e4d8 100644
--- a/lib/plugins/sms/twilio/twilio.js
+++ b/lib/plugins/sms/twilio/twilio.js
@@ -17,7 +17,6 @@ function sendMessage (account, rec) {
     from: account.fromNumber
   }
 
-
   return client.sendMessage(opts)
   .catch(err => {
     if (_.includes(err.code, BAD_NUMBER_CODES)) {
diff --git a/lib/wallet.js b/lib/wallet.js
index b500db7f..6d0f73ae 100644
--- a/lib/wallet.js
+++ b/lib/wallet.js
@@ -44,15 +44,11 @@ function balance (settings, cryptoCode) {
 }
 
 function sendCoins (settings, toAddress, cryptoAtoms, cryptoCode) {
-  console.log('DEBUG40')
   return fetchWallet(settings, cryptoCode)
   .then(r => {
-    console.log('DEBUG41')
     return r.wallet.sendCoins(r.account, toAddress, cryptoAtoms, cryptoCode)
     .then(res => {
-      console.log('DEBUG42')
       mem.clear(module.exports.balance)
-      console.log('DEBUG43: %j', res)
       return res
     })
   })