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author | Christian Grothoff <christian@grothoff.org> | 2015-08-03 19:33:18 +0200 |
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committer | Christian Grothoff <christian@grothoff.org> | 2015-08-03 19:33:18 +0200 |
commit | 918f2ac2942e8f882b60debc97e2e55fb4e045f6 (patch) | |
tree | 35c2d559f79674430b5265f6b089bf6c41bb35d1 /index.html | |
parent | 4657b075eb2d31d5f5fdc630f7751b227813d0f3 (diff) | |
download | www-918f2ac2942e8f882b60debc97e2e55fb4e045f6.tar.gz www-918f2ac2942e8f882b60debc97e2e55fb4e045f6.tar.bz2 www-918f2ac2942e8f882b60debc97e2e55fb4e045f6.zip |
explain transaction vs. sharing
Diffstat (limited to 'index.html')
-rw-r--r-- | index.html | 48 |
1 files changed, 47 insertions, 1 deletions
@@ -268,7 +268,53 @@ </ol> </p> </div> - <!--# include file="common/footer.inc" --> + <div class="col-lg-12"> + <h2 lang="en" id="taxability">Taler technology: About taxability, change and privacy</h1> + <h2 lang="de">Taler Technik: Steuern, Wechselgeld und Privatsphäre</h1> + <h2 lang="fr" note="outdated"></h2> + <h2 lang="it" note="outdated"></h2> + <p lang="en">One of the key goals of Taler is to provide anonymity for + citizens buying goods and services, while ensuring that the state can + observe incoming transactions to ensure businesses engage only in + legal activities and do not evade taxes (such as income tax, + sales tax or value-added tax). However, we also want to stay + out of the immediate personal domain, so sharing funds within a + family or copying coins between devices should not be subject to + monitoring by the state. + </p> + <p lang="en">In Taler terminology, we distinguish between + <b>transactions</b> where the exclusive ownership of the value of a + coin is passed from one entity to another, and <b>sharing</b> + whereafter control over a coin is shared by multiple electronic + wallets (which may belong to different individuals). In Taler, + the receiver of a transaction is visible to the state and thus + can be taxed, while sharing is invisible to anyone not involved. + Once a coin is shared among different individuals, any one of those + can try to spend it, but only the first spender would succeed. Thus, + sharing requires a strong trust relationship among the individuals + involved, and thus represent interactions in the protected immediate + personal domain, and not commercial transactions. + </p> + <p lang="en">When Taler needs to provide change, for example because + a customer only has a 5 Euro coin but wants to make a 2 Euro + purchase, it needs to create <b>fresh</b> coins (of a total value + of 3 Euros) that are <b>unlinkable</b> to the original 5 Euro coin + to ensure privacy. To ensure that the resulting <b>refresh</b> + operation where the change is converted to fresh coins cannot be + used to <i>transfer</i> funds from one entity to another, Taler ensures + that any owner of an original coin that was involved in a + refresh operation can follow a <b>link</b> to the private + information of the fresh coins generated by the operation. As a + result of this trick, refresh operations cannot uses to create + <i>transfers</i>, as the linkage ensures that the fresh coins are + always <i>shared</i> with the owner of the original coin. + </p> + <p lang="en">As a result, Taler does not intrude into the + personal economic domain, offers good privacy, taxability + for transactions and the ability to give change. + </p> + </div> + <!--# include file="common/footer.inc" --> </div> <!-- /container --> </body> </html> |