Blockchain.info automatic transaction On Sep 17 I wanted to transfer 0.001 BTC from one Blockchain.info account (bitcoin address 1BFFtYPgtaZUHujDqiehqSseZvuUzJQxki) to another Blockchain.info account (bitcoin address 1DE4VjkipjVEoevVJCpLQARZcYdDvZgcow): transaction 2e358fe6cd80b998eeb3f4378ab0fdbcc8d78e5898a8ebf232394a96908d84be.

I got an email notification about this transaction:


  Subject: Bitcoin Payment Received
  Date: Wed, 17 Sep 2014 18:41:17 +0000 (UTC)  
  
  Payment Received Notification
  A Payment has been received into your bitcoin wallet.
  2e358fe6cd80b998eeb3f4378ab0fdbcc8d78e5898a8ebf232394a96908d84be
  1BFFtYPgtaZUHujDqiehqSseZvuUzJQxki -> 1DE4VjkipjVEoevVJCpLQARZcYdDvZgcow 0.001 BTC


Some days later I got the following email:


  Subject: Bitcoin Transaction Failed
  Date: Fri, 19 Sep 2014 19:03:34 +0000 (UTC)  
  
  Transaction Confirmation Failed
  A transaction made through Blockchain.info has been removed from our database because it was taking a long time to be included in a block.
  Any funds have been returned to your wallet and you can now spend the coins again. Please consider including a larger fee in future transactions.


This happend because I have not included any transaction fee, I know. But I also got this email:


  Subject: Bitcoin Payment Received
  Date: Sat, 20 Sep 2014 02:41:23 +0000 (UTC)  
  
  Payment Received Notification
  A Payment has been received into your bitcoin wallet.
  2e358fe6cd80b998eeb3f4378ab0fdbcc8d78e5898a8ebf232394a96908d84be
  1BFFtYPgtaZUHujDqiehqSseZvuUzJQxki -> 1DE4VjkipjVEoevVJCpLQARZcYdDvZgcow 0.001 BTC


I took no action on the evening of Sep 19. I noticed the latest 2 mails on the morning of Sep 20. This new transaction was created automatically by Blockcain.info. Since the second email said A transaction made through Blockchain.info has been removed from our database [...] I thought the transaction has been deleted but the new transaction ID is the same as on Sep 17.

If you look at Blockchain.info Transaction 2e358fe6cd80b998eeb3f4378ab0fdbcc8d78e5898a8ebf232394a96908d84be you can see Received Time 2014-09-20 02:41:16, not the original date 2014-09-17.


Why have both transactions the same ID?
Why do Blockchain.info automatically create a transaction without asking the user?
You do not understand correctly how does bitcoin network work. Your first transaction was sent to a network and will live there until all it is valid or all nodes forget about it.

Blockchain.info just notifies you that it was not confirmed into a block in reasonable time. Blockchain.info removed it from its memory, but there are nodes on the network which do not forget about it and one of them broadcasted this transaction to its peers.


  Why have both transactions the same ID?


These are not two transactions. This is one transacton, received by blockchain.info twice. First time you sent it. Second time blockchain.info received it fron one of peers.


  Why do Blockchain.info automatically create a transaction without asking the user?


They did not.