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I’ve been playing with Gavin’s “bitcointools” (again) to track what happened to the famous “pizza” Bitcoins.
It turns out that rather than being rare collector’s items, the 10,000 BTC exchanged for two pizzas have spread out to over a million different Bitcoin addresses since buying the pizzas, not counting the dilute fragments that ended up in transaction fees.
As of block 166149, on Feb 10th 2012, 1,037,382 addresses have held the pizza coins since they were spent. 174,584 of those still hold pizza coins (the others may or may not be empty addresses, since it’s possible to have two different transactions output to the same address without the coins becoming mixed together. In other words it’s possible to have “pizza coins” and “non pizza coins” in the same address and still be able to tell which are which. Of the approximately 600k addresses which are currently holding funds, around 29% of them contain pizza coins.
The shortest chain of transactions from the pizza purchase to currently held pizza coins has length 9, and the longest has length 6,723.
There is no currently unredeemed output which contains 100% pure pizza coins. All the pizza coins have been diluted somewhat with other coins. The purest remaining are these 100 BTC which are 90.7276% pure pizza coin, and just 11 transactions separated from the pizza transaction. (The most recent 9 transactions each only have 1 input, so it’s easy to follow it back that far. In the next transaction back the pizza coins came from both the last but one input, worth 4223 BTC, and 5th from last input, worth 5777. Together those 2 inputs make up the full 100% pure 10k BTC pizza coins. The other inputs in this big transaction, worth 1022 BTC in total are the only non pizza coins introduced. 10000 * 100 / 11022 = 90.7276%, the purity).
I also checked my wallet to see if I was holding any pizza coins. 8 of my addresses are holding pizza coins, but very diluted. My ‘strongest’ has a purity of 1.1760%, and is a tiny withdrawal I made from MtGox in October 2011.
Finally, here’s some data showing the month-by-month spread of the pizza coins:
pizza payment of 10000.00000000 BTC to 17SkEw2md5avVNyYgj6RiXuQKNwkXaxFyQ
is in block 57043
-block --date-- --total-- ---used--%total- -active---%total---%used-
58815 May 2010 4 2 (50.00%) 4 100.00% 200.00%
63561 Jun 2010 4 2 (50.00%) 0 0.00% 0.00%
71436 Jul 2010 26 8 (30.77%) 24 92.31% 300.00%
77452 Aug 2010 34 10 (29.41%) 13 38.24% 130.00%
82997 Sep 2010 138 37 (26.81%) 106 76.81% 286.49%
88892 Oct 2010 2,016 265 (13.14%) 1,898 94.15% 716.23%
94801 Nov 2010 6,295 577 ( 9.17%) 4,428 70.34% 767.42%
100409 Dec 2010 7,510 835 (11.12%) 1,464 19.49% 175.33%
-block --date-- --total-- ---used--%total- -active---%total---%used-
105570 Jan 2011 13,271 1,540 (11.60%) 6,150 46.34% 399.35%
111136 Feb 2011 19,055 2,632 (13.81%) 6,423 33.71% 244.03%
116038 Mar 2011 42,027 5,605 (13.34%) 24,341 57.92% 434.27%
121126 Apr 2011 69,544 9,085 (13.06%) 29,727 42.75% 327.21%
127865 May 2011 123,997 26,032 (20.99%) 57,911 46.70% 222.46%
134121 Jun 2011 249,138 54,047 (21.69%) 132,348 53.12% 244.88%
139035 Jul 2011 382,845 93,928 (24.53%) 146,156 38.18% 155.60%
143408 Aug 2011 494,140 108,340 (21.92%) 126,134 25.53% 116.42%
147565 Sep 2011 589,942 119,491 (20.25%) 111,178 18.85% 93.04%
151314 Oct 2011 680,787 131,370 (19.30%) 105,320 15.47% 80.17%
155451 Nov 2011 780,292 142,302 (18.24%) 114,013 14.61% 80.12%
160036 Dec 2011 885,172 156,321 (17.66%) 120,631 13.63% 77.17%
-block --date-- --total-- ---used--%total- -active---%total---%used-
164780 Jan 2012 998,087 170,082 (17.04%) 136,985 13.72% 80.54%
166149 Feb 2012 1,037,382 174,584 (16.83%) 54,346 5.24% 31.13%
Edit: I just found these 100% pure allinvain coins – undiluted after 24 hops from when 25k BTC was stolen from his computer.
Edit 2: I don’t mean to imply that the allinvain coins haven’t been thoroughly looted. They have touched 755,796 different addresses since being stolen and are currently sitting in 109,235 different addresses, including 8 from my own personal wallet. The exact same 8 as have pizza coins in them, it turns out.
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