I think it may be an attack? when blockchain came back up I had a few 1 satoshi transactions that had been sent to old addresses in my wallet.

They came from the following addresses: https://blockchain.info/address/1Enjoy1C4bYBr3tN4sMKxvvJDqG8NkdR4Z & https://blockchain.info/address/1SochiWwFFySPjQoi2biVftXn8NRPCSQC

'Enjoy' & 'Sochi' = Enjoy Satoshi? Lol

Why would blockchain being down have anything to do with transactions getting confirmed? Unless you mean people had been wanting to send transactions with blockchain wallets and they all done it as soon as it came back up.