blog/A_fist_full_of_non_anonymous_Bitcoins.html

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   6     <title>Petter Reinholdtsen: A fist full of non-anonymous Bitcoins</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">A fist full of non-anonymous Bitcoins</div>
  24       <div class="date">29th January 2014</div>
  25       <div class="body"><p>Bitcoin is a incredible use of peer to peer communication and
  26 encryption, allowing direct and immediate money transfer without any
  27 central control.  It is sometimes claimed to be ideal for illegal
  28 activity, which I believe is quite a long way from the truth.  At least
  29 I would not conduct illegal money transfers using a system where the
  30 details of every transaction are kept forever.  This point is
  31 investigated in
  32 <a href="https://www.usenix.org/publications/login">USENIX ;login:</a>
  33 from December 2013, in the article
  34 "<a href="https://www.usenix.org/system/files/login/articles/03_meiklejohn-online.pdf">A
  35 Fistful of Bitcoins - Characterizing Payments Among Men with No
  36 Names</a>" by Sarah Meiklejohn, Marjori Pomarole,Grant Jordan, Kirill
  37 Levchenko, Damon McCoy, Geoffrey M. Voelker, and Stefan Savage.  They
  38 analyse the transaction log in the Bitcoin system, using it to find
  39 addresses belong to individuals and organisations and follow the flow
  40 of money from both Bitcoin theft and trades on Silk Road to where the
  41 money end up.  This is how they wrap up their article:</p>
  42
  43 <p><blockquote>
  44 <p>"To demonstrate the usefulness of this type of analysis, we turned
  45 our attention to criminal activity. In the Bitcoin economy, criminal
  46 activity can appear in a number of forms, such as dealing drugs on
  47 Silk Road or simply stealing someone else’s bitcoins. We followed the
  48 flow of bitcoins out of Silk Road (in particular, from one notorious
  49 address) and from a number of highly publicized thefts to see whether
  50 we could track the bitcoins to known services. Although some of the
  51 thieves attempted to use sophisticated mixing techniques (or possibly
  52 mix services) to obscure the flow of bitcoins, for the most part
  53 tracking the bitcoins was quite straightforward, and we ultimately saw
  54 large quantities of bitcoins flow to a variety of exchanges directly
  55 from the point of theft (or the withdrawal from Silk Road).</p>
  56
  57 <p>As acknowledged above, following stolen bitcoins to the point at
  58 which they are deposited into an exchange does not in itself identify
  59 the thief; however, it does enable further de-anonymization in the
  60 case in which certain agencies can determine (through, for example,
  61 subpoena power) the real-world owner of the account into which the
  62 stolen bitcoins were deposited.  Because such exchanges seem to serve
  63 as chokepoints into and out of the Bitcoin economy (i.e., there are
  64 few alternative ways to cash out), we conclude that using Bitcoin for
  65 money laundering or other illicit purposes does not (at least at
  66 present) seem to be particularly attractive."</p>
  67 </blockquote><p>
  68
  69 <p>These researches are not the first to analyse the Bitcoin
  70 transaction log.  The 2011 paper
  71 "<a href="http://arxiv.org/abs/1107.4524">An Analysis of Anonymity in
  72 the Bitcoin System</A>" by Fergal Reid and Martin Harrigan is
  73 summarized like this:</p>
  74
  75 <p><blockquote>
  76 "Anonymity in Bitcoin, a peer-to-peer electronic currency system, is a
  77 complicated issue. Within the system, users are identified by
  78 public-keys only. An attacker wishing to de-anonymize its users will
  79 attempt to construct the one-to-many mapping between users and
  80 public-keys and associate information external to the system with the
  81 users. Bitcoin tries to prevent this attack by storing the mapping of
  82 a user to his or her public-keys on that user's node only and by
  83 allowing each user to generate as many public-keys as required. In
  84 this chapter we consider the topological structure of two networks
  85 derived from Bitcoin's public transaction history. We show that the
  86 two networks have a non-trivial topological structure, provide
  87 complementary views of the Bitcoin system and have implications for
  88 anonymity. We combine these structures with external information and
  89 techniques such as context discovery and flow analysis to investigate
  90 an alleged theft of Bitcoins, which, at the time of the theft, had a
  91 market value of approximately half a million U.S. dollars."
  92 </blockquote></p>
  93
  94 <p>I hope these references can help kill the urban myth that Bitcoin
  95 is anonymous.  It isn't really a good fit for illegal activites.  Use
  96 cash if you need to stay anonymous, at least until regular DNA
  97 sampling of notes and coins become the norm. :)</p>
  98
  99 <p>As usual, if you use Bitcoin and want to show your support of my
 100 activities, please send Bitcoin donations to my address
 101 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 102 </div>
 103
 104       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>, <a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix</a>.</div>
 105
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 249
 250 <li>2015
 251 <ul>
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 276
 277 </ul></li>
 278
 279 <li>2014
 280 <ul>
 281
 282 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 283
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 305
 306 </ul></li>
 307
 308 <li>2013
 309 <ul>
 310
 311 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 312
 313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
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 334
 335 </ul></li>
 336
 337 <li>2012
 338 <ul>
 339
 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
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 363
 364 </ul></li>
 365
 366 <li>2011
 367 <ul>
 368
 369 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
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 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 392
 393 </ul></li>
 394
 395 <li>2010
 396 <ul>
 397
 398 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 399
 400 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 422 </ul></li>
 423
 424 <li>2009
 425 <ul>
 426
 427 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 428
 429 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 443 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
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 448
 449 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 450
 451 </ul></li>
 452
 453 <li>2008
 454 <ul>
 455
 456 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 457
 458 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 459
 460 </ul></li>
 461
 462 </ul>
 463
 464
 465
 466 <h2>Tags</h2>
 467 <ul>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (11)</a></li>
 480
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 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
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 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
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 566
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 571  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 572
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 592
 593  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
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 595  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 596
 597 </ul>
 598
 599
 600     </div>
 601     <p style="text-align: right">
 602  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 603 </p>
 604
 605   </body>
 606 </html>