this is famous cryptsy bot

it can transfer single amount of altcoins/bitcoin repeatedly within single block

[–]MaChiseMo [score hidden] 8 hours ago*

At 2016-01-24 02:31:21, 9612 btc was progressively sent over and over at a decreasing rate over thousands of transactions until 7906 was left. Theft and laundering sounds about right.

Edit: Here you go, it was 10000 btc 1.5 days ago from 376 other addresses: https://www.blocktrail.com/BTC/address/18SwPkgUHFo8QLh5fMcchKvmUVrFNxXF6B/transactions Surely this is Cryptsy-related?

[–]jamaicanbind [score hidden] 7 hours ago

It looks like it was the same 9000 or so coins sent over and over to different addresses. A mixer maybe?

https://blockchain.info/address/1AqqVCAhKwxxeTwPhpYxwHNW8tPzVztY23

[–]_madmat 1 point 43 minutes ago

The 5.7 million btc in one block are just 10,000 btc moving and moving. Today, you could spend unconfirmed outputs so you could move the same coins many times in the same block. I think i found the initial transactions : https://blockchain.info/fr/address/18SwPkgUHFo8QLh5fMcchKvmUVrFNxXF6B

Good luck to go further back, this has been mixed an remixed.