tx controller + nonce tracker - record nonce components on txMeta

app/scripts/controllers/transactions.js

@@ -200,8 +200,12 @@ module.exports = class TransactionController extends EventEmitter {
       // get next nonce
       const txMeta = this.getTx(txId)
       const fromAddress = txMeta.txParams.from
+      // wait for a nonce
       nonceLock = await this.nonceTracker.getNonceLock(fromAddress)
+      // add nonce to txParams
       txMeta.txParams.nonce = nonceLock.nextNonce
+      // add nonce debugging information to txMeta
+      txMeta.nonceDetails = nonceLock.nonceDetails
       this.updateTx(txMeta)
       // sign transaction
       const rawTx = await this.signTransaction(txId)

app/scripts/lib/nonce-tracker.js

@@ -37,8 +37,11 @@ class NonceTracker {
     assert(Number.isInteger(baseCount), `nonce-tracker - baseCount is not an integer - got: (${typeof baseCount}) "${baseCount}"`)
     const nextNonce = baseCount + pendingCount
     assert(Number.isInteger(nextNonce), `nonce-tracker - nextNonce is not an integer - got: (${typeof nextNonce}) "${nextNonce}"`)
-    // return next nonce and release cb
-    return { nextNonce, releaseLock }
+    // collect the numbers used to calculate the nonce for debugging
+    const blockNumber = currentBlock.number
+    const nonceDetails = { blockNumber, baseCount, pendingCount }
+    // return nonce and release cb
+    return { nextNonce, nonceDetails, releaseLock }
   }
 
   async _getCurrentBlock () {