I was curious how many chips got emptied, so I compared the number of funded addresses with "chip-sized-balances" this morning to yesterday morning's balances. Note that this isn't meant to be accurate, it also includes non-chips with the same balance (and it could even include addresses that received additional funds so they're no longer counted as "chips"). Despite these shortcomings, I'm pretty sure most of them are chips.
1 mBTC chips: March 15: 377619 - March 16: 373824 - Difference: -3795 funded addresses. Total balance swept:
-3.795 BTC.
2 mBTC chips: March 15: 81644 - March 16: 79035 - Difference: -2609 funded addresses. Total balance swept:
-5.218 BTC.
4 mBTC chips: March 15: 32943 - March 16: 30463 - Difference: -2480 funded addresses. Total balance swept:
-9.92 BTC.
8 mBTC chips: March 15: 16179 - March 16: 13950 - Difference: -2229 funded addresses. Total balance swept:
-17.832 BTC.
16 mBTC chips: March 15: 8823 - March 16: 6701 - Difference: -2122 funded addresses. Total balance swept:
-33.952 BTC.
32 mBTC chips: March 15: 4737 - March 16: 3452 - Difference: -1285 funded addresses. Total balance swept:
-41.12 BTC.
64 mBTC chips: March 15: 2410 - March 16: 1359 - Difference: -1051 funded addresses. Total balance swept:
-67.264 BTC.
128 mBTC chips: March 15: 1638 - March 16: 830 - Difference: -808 funded addresses. Total balance swept:
-103.424 BTC.
256 mBTC chips: March 15: 1702 - March 16: 392 - Difference: -1310 funded addresses. Total balance swept:
-335.36 BTC.
500 mBTC chips: March 15: 57401 - March 16: 57411 - Difference: 10 funded addresses. Total balance swept: 5 BTC.512 mBTC chips: March 15: 973 - March 16: 277 - Difference: -696 funded addresses. Total balance swept:
-356.352 BTC.
1000 mBTC chips: March 15: 96484 - March 16: 96525 - Difference: 41 funded addresses. Total balance swept: 41 BTC.1024 mBTC chips: March 15: 1582 - March 16: 267 - Difference: -1315 funded addresses. Total balance swept:
-1.346.56 BTC.
2000 mBTC chips: March 15: 19824 - March 16: 19792 - Difference: -32 funded addresses. Total balance swept:
-64 BTC.
2048 mBTC chips: March 15: 229 - March 16: 57 - Difference: -172 funded addresses. Total balance swept:
-352.256 BTC.
4000 mBTC chips: March 15: 4493 - March 16: 4496 - Difference: 3 funded addresses. Total balance swept: 12 BTC.4096 mBTC chips: March 15: 238 - March 16: 114 - Difference: -124 funded addresses. Total balance swept:
-507.904 BTC.
8000 mBTC chips: March 15: 1293 - March 16: 1284 - Difference: -9 funded addresses. Total balance swept:
-72 BTC.
8192 mBTC chips: March 15: 81 - March 16: 15 - Difference: -66 funded addresses. Total balance swept:
-540.672 BTC.
For comparison, this is what the data would have looked like on a "normal" day (2 days earlier):
1 mBTC chips: March 13: 377071 - March 14: 376999 - Difference: -72 funded addresses. Total balance swept:
-0.072 BTC.
2 mBTC chips: March 13: 81456 - March 14: 81506 - Difference: 50 funded addresses. Total balance swept: 0.1 BTC.
4 mBTC chips: March 13: 32672 - March 14: 32742 - Difference: 70 funded addresses. Total balance swept: 0.28 BTC.
8 mBTC chips: March 13: 15963 - March 14: 16019 - Difference: 56 funded addresses. Total balance swept: 0.448 BTC.
16 mBTC chips: March 13: 8664 - March 14: 8708 - Difference: 44 funded addresses. Total balance swept: 0.704 BTC.
32 mBTC chips: March 13: 4717 - March 14: 4736 - Difference: 19 funded addresses. Total balance swept: 0.608 BTC.
64 mBTC chips: March 13: 2394 - March 14: 2416 - Difference: 22 funded addresses. Total balance swept: 1.408 BTC.
128 mBTC chips: March 13: 1628 - March 14: 1639 - Difference: 11 funded addresses. Total balance swept: 1.408 BTC.
256 mBTC chips: March 13: 1629 - March 14: 1673 - Difference: 44 funded addresses. Total balance swept: 11.264 BTC.
500 mBTC chips: March 13: 57411 - March 14: 57449 - Difference: 38 funded addresses. Total balance swept: 19 BTC.
512 mBTC chips: March 13: 915 - March 14: 960 - Difference: 45 funded addresses. Total balance swept: 23 BTC.
1000 mBTC chips: March 13: 96436 - March 14: 96480 - Difference: 44 funded addresses. Total balance swept: 44 BTC.
1024 mBTC chips: March 13: 1575 - March 14: 1596 - Difference: 21 funded addresses. Total balance swept: 21.504 BTC.
2000 mBTC chips: March 13: 19810 - March 14: 19806 - Difference: -4 funded addresses. Total balance swept:
-8 BTC.
2048 mBTC chips: March 13: 205 - March 14: 231 - Difference: 26 funded addresses. Total balance swept: 53.248 BTC.
4000 mBTC chips: March 13: 4482 - March 14: 4481 - Difference: -1 funded addresses. Total balance swept:
-4 BTC.
4096 mBTC chips: March 13: 231 - March 14: 242 - Difference: 11 funded addresses. Total balance swept: 45.056 BTC.
8000 mBTC chips: March 13: 1290 - March 14: 1288 - Difference: -2 funded addresses. Total balance swept:
-16 BTC.
8192 mBTC chips: March 13: 78 - March 14: 83 - Difference: 5 funded addresses. Total balance swept: 40.96 BTC.
(note: when the total balance "swept" is positive, more addresses with that balance were created, not swept).
A quick count shows that more than 1900 Bitcoin was swept, which makes me believe that not all private keys were compromised and some users swept it on their own.
Raw data source:
List of all Bitcoin addresses with a balance
UpdateSegwit (addresses starting with bc) only:
1 mBTC chips: March 15: 129252 - March 16: 127143 - Difference: -2109 funded addresses. Total balance swept:
-2,109 BTC.
2 mBTC chips: March 15: 22471 - March 16: 20861 - Difference: -1610 funded addresses. Total balance swept:
-3,22 BTC.
4 mBTC chips: March 15: 8205 - March 16: 6591 - Difference: -1614 funded addresses. Total balance swept:
-6,456 BTC.
8 mBTC chips: March 15: 4893 - March 16: 3313 - Difference: -1580 funded addresses. Total balance swept:
-12,64 BTC.
16 mBTC chips: March 15: 3534 - March 16: 1840 - Difference: -1694 funded addresses. Total balance swept:
-27,104 BTC.
32 mBTC chips: March 15: 1810 - March 16: 873 - Difference: -937 funded addresses. Total balance swept:
-29,984 BTC.
64 mBTC chips: March 15: 1012 - March 16: 334 - Difference: -678 funded addresses. Total balance swept:
-43,392 BTC.
128 mBTC chips: March 15: 876 - March 16: 169 - Difference: -707 funded addresses. Total balance swept:
-90,496 BTC.
256 mBTC chips: March 15: 1296 - March 16: 77 - Difference: -1219 funded addresses. Total balance swept:
-312,064 BTC.
500 mBTC chips: March 15: 29868 - March 16: 29891 - Difference: 23 funded addresses. Total balance swept: 11,5 BTC.
512 mBTC chips: March 15: 657 - March 16: 37 - Difference: -620 funded addresses. Total balance swept:
-317,44 BTC.
1000 mBTC chips: March 15: 31921 - March 16: 31964 - Difference: 43 funded addresses. Total balance swept: 43 BTC.
1024 mBTC chips: March 15: 1333 - March 16: 54 - Difference: -1279 funded addresses. Total balance swept:
-1,309,696 BTC.
2000 mBTC chips: March 15: 7746 - March 16: 7755 - Difference: 9 funded addresses. Total balance swept: 18 BTC.
2048 mBTC chips: March 15: 196 - March 16: 37 - Difference: -159 funded addresses. Total balance swept:
-325,632 BTC.
4000 mBTC chips: March 15: 1615 - March 16: 1620 - Difference: 5 funded addresses. Total balance swept: 20 BTC.
4096 mBTC chips: March 15: 127 - March 16: 15 - Difference: -112 funded addresses. Total balance swept:
-458,752 BTC.
8000 mBTC chips: March 15: 397 - March 16: 392 - Difference: -5 funded addresses. Total balance swept:
-40 BTC.
8192 mBTC chips: March 15: 61 - March 16: 3 - Difference: -58 funded addresses. Total balance swept:
-475,136 BTC.
Native (addresses starting with 1) only:
1 mBTC chips: March 15: 202374 - March 16: 200753 - Difference: -1621 funded addresses. Total balance swept:
-1,621 BTC.
2 mBTC chips: March 15: 45485 - March 16: 44496 - Difference: -989 funded addresses. Total balance swept:
-1,978 BTC.
4 mBTC chips: March 15: 19819 - March 16: 18920 - Difference: -899 funded addresses. Total balance swept:
-3,596 BTC.
8 mBTC chips: March 15: 8595 - March 16: 7936 - Difference: -659 funded addresses. Total balance swept:
-5,272 BTC.
16 mBTC chips: March 15: 3916 - March 16: 3486 - Difference: -430 funded addresses. Total balance swept:
-6,88 BTC.
32 mBTC chips: March 15: 2191 - March 16: 1848 - Difference: -343 funded addresses. Total balance swept:
-10,976 BTC.
64 mBTC chips: March 15: 1193 - March 16: 823 - Difference: -370 funded addresses. Total balance swept:
-23,68 BTC.
128 mBTC chips: March 15: 650 - March 16: 548 - Difference: -102 funded addresses. Total balance swept:
-13,056 BTC.
256 mBTC chips: March 15: 356 - March 16: 264 - Difference: -92 funded addresses. Total balance swept:
-23,552 BTC.
500 mBTC chips: March 15: 15473 - March 16: 15460 - Difference: -13 funded addresses. Total balance swept:
-6,5 BTC.
512 mBTC chips: March 15: 283 - March 16: 207 - Difference: -76 funded addresses. Total balance swept:
-38,912 BTC.
1000 mBTC chips: March 15: 42015 - March 16: 41998 - Difference: -17 funded addresses. Total balance swept:
-17 BTC.
1024 mBTC chips: March 15: 244 - March 16: 208 - Difference: -36 funded addresses. Total balance swept:
-36,864 BTC.
2000 mBTC chips: March 15: 6352 - March 16: 6314 - Difference: -38 funded addresses. Total balance swept:
-76 BTC.
2048 mBTC chips: March 15: 32 - March 16: 19 - Difference: -13 funded addresses. Total balance swept:
-26,624 BTC.
4000 mBTC chips: March 15: 1499 - March 16: 1496 - Difference: -3 funded addresses. Total balance swept:
-12 BTC.
4096 mBTC chips: March 15: 109 - March 16: 97 - Difference: -12 funded addresses. Total balance swept:
-49,152 BTC.
8000 mBTC chips: March 15: 518 - March 16: 515 - Difference: -3 funded addresses. Total balance swept:
-24 BTC.
8192 mBTC chips: March 15: 19 - March 16: 11 - Difference: -8 funded addresses. Total balance swept:
-65,536 BTC.