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LaurentMT / gist:e758767ca4038ac40aaf
Last active April 29, 2024 07:45
Bitcoin Transactions & Privacy (part 1)
This document is an attempt to define metrics quantifying the degree of privacy provided by a bitcoin transaction.
Objectives
Definition of metrics measuring the resistance of a transaction to a set of attacks against users privacy.
Attacks considered in the scope of these metrics are:
- Merged Inputs Heuristic: methods identifying the inputs controlled by a same entity
- Coinjoin Sudoku: methods identifying the links existing between the inputs and outputs of a transaction
@LaurentMT
LaurentMT / gist:d361bca6dc52868573a2
Created September 21, 2015 11:47
Bitcoin Transactions & Privacy (part 2)
Context
In part 1 of this document, we've defined the entropy of a transaction.
This metric is a first good proxy to qualify the degree of privacy provided by a transaction but it fails to detect privacy leaks occuring at lower levels (1).
In this second part, we define 2 complementary fine-grained tools/metrics: the Link Probability of 2 utxos (LP) and the Link Probability Matrix (LPM) of a transaction.
Link Probability of 2 UTXOs
We call Link Probability of a tuple (tx input, tx output) the probability that a link exists between the 2 utxos.
@LaurentMT
LaurentMT / gist:e8644d5bc903f02613c6
Created September 21, 2015 11:48
Bitcoin Transactions & Privacy (part 3)
Context
This third part is about known and potential attacks against the privacy provided by tools like coinjoin.
Known attacks & weaknesses
- Linkability of inputs and outputs
A good illustration of this attack is Coinjoin Sudoku (see (1) for details).
@LaurentMT
LaurentMT / gist:d2b8cd50e346f681eb67
Created March 2, 2016 00:49
Back to home. As promised, here are some elements about the growth of activity observed during the last months.
I apologize in advance for the long text and my crappy english.
A bit of context: I've been working on the development of OXT (an analytics platform dedicated to the bitcoin blockchain) during the last 12 months. It means that I've spent a part of this time observing charts to check if they make sense, are useful...
During this process I've learned one thing: bitcoin is still a small economy and therefore it's still possible that the activity of a single actor/service has a visible impact at global level.
For instance, some of these observations are related to well known events like the growth of #txs in 2012 (related to Satoshi Dice).
Some others are less known like this pattern in the growth of the utxo set which is likely to be caused by a small number of faucets doing weekly payments (https://bitcointalk.org/index.php?topic=1055594.msg11394989#msg11394989)
At last, some cases remain very myste
@LaurentMT
LaurentMT / longchain_604531341.csv
Created March 3, 2016 01:58
Ride the long chain (02/29/2016)
We can make this file beautiful and searchable if this error is corrected: No commas found in this CSV file in line 0.
depth;block;txid;receiver;amount_sent;amount_remaining;
0;400590;e26fa07a279f7d89ccb3f1a06a0e48ae0352c7eb4569eeef485f0370da075f73;;2049224;86979660465;
1;400590;49a3906606a37d7cd80ea35ab0f776f20e334306e2baf89929ad92f3bcc40a0b;ANON-543454272;2049224;86977581241;
2;400590;73fea04aaa60bdef18fd33e20f1738cba8f936a238c876669af0ba9743e62ff7;;10246122;86967305119;
3;400590;d8fb997145aae91ff7f8d2f9c3755e8d2b42d4af16447e4ed18b5ac1d0fd3b81;ANON-543454272;630819571;86336455548;
4;400590;6b020df2effde11fd8dba37d7757fe5e209cf38e8431801bc22c4e9535b48577;;53621371;86282804177;
5;400590;cba27ca7dac95ffc75ccc0be7b350f62e5910dba52362b7a2326abac6fde2c63;ANON-604635767;33129127;86249645050;
6;400590;dbdec93c617dad201cbcc5116aec5c15c2c3a58c9b50c255dca37648f4b664b0;;20833781;86228781269;
7;400590;44424153548ea72cd37bd13d568cbc8618d4073cb17a12d87bbd89812f9501a2;ANON-543454272;19126094;86209625175;
8;400590;8053b20f31d28e5ed3d95c1f7a57f70750751e39c2a5d34cb90df26221ec1916;ANON-543454272;11612271;86197982904;
@LaurentMT
LaurentMT / keybase.md
Created January 1, 2018 18:16

Keybase proof

I hereby claim:

  • I am laurentmt on github.
  • I am laurentmt (https://keybase.io/laurentmt) on keybase.
  • I have a public key ASDiYbNA_9vdNN7-9VaxVosu5LZizw7Uz6Va-ZmMqYYnhwo

To claim this, I am signing this object:

@LaurentMT
LaurentMT / cold_wallet_related_addr_txs.txt
Created February 17, 2019 02:45
List of addresses and transactions related to QCX Cold Wallet addresses
@LaurentMT
LaurentMT / 1JZJA_spending_txs.txt
Created February 17, 2019 02:47
List of transactions with an input from 1JZJaDDC44DCKLnezDsbW43Zf8LspCKBYP
TXS WITH AN INPUT CONTROLLED 1JZJaDDC44DCKLnezDsbW43Zf8LspCKBYP
-----------------------------------------------------------------------------------------
['117049c3eee4d0da5742738c084b83f2e1c467b461ce0dff6d4e612021e82fcd']
['b9cb6053f1c642b0f2aba6e3b21a954807f329edad62571c51e412d33b0d1af1']
['025189637c6519406d3f7a44d3338f84e3a698ee1fb9a6383437ebaf024cf092']
['2a1cb790f04a52d96a41753ff074de526154b3b827d924299964a1bf33f15b2e']
['a8520331a3fc0112b803d50609bf154ec2d6c036116fd25082aa572e318617ed']
['29ebaaa955a6c2e70fb369a464500a21bdf8a4fd5640403372b0f688e175a2b3']
['e0150e9e3c833001ffd107f4756096f2ef67acad9059f6dd8469e3a8a6a38ac4']
['2c88f50d126ee27836840ac47d6c33eeab1fe97fa61305230a53c33ce246d7f9']
@LaurentMT
LaurentMT / 1JZJA_related_addresses.txt
Created February 17, 2019 02:49
List of addresses having an output spent with an output of 1JZJaDDC44DCKLnezDsbW43Zf8LspCKBYP
@LaurentMT
LaurentMT / Wallet ANON-1725327308
Created March 4, 2019 14:25
3GWdttsNNZhujgR76nr9Y712njMUnRSMpV
3Kb1NQMA65jCKn61cuayMtzhpjNYmXSf3B
38fVmFdYjxaKcRNAT2on3kju6sCVf9XN1f
3C2fdFyqgvr5xCYVPZ3846jnh8DNiDZRwE
3Pg6z6TXLke1MUsVpUp5YHmoX278DyQNtu
34G1H4QLHddtj4zeJXJJBd7Nva9pYAybbe
3DsKxefZnGDcNpRRX46Tbfv1ZSXNRBTrjz
33HjoA3BiAJrEjD3Bvbg1wNUCcEamXLy9p
37YLkeBZd6uMZgW8V3gJpBDVqWFsDevptQ
3J5ZGTUQPDjUrcHwJWfhkyJEYEjDZYh3Fg