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Christian Grothoff 2023-06-12 18:08:08 +02:00
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8 changed files with 72 additions and 26 deletions
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5
doc/flows/int-deposit.tex
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@ -1,6 +1,7 @@
\section{Deposit}
\section{Deposit} \label{sec:deposit}
% FIXME: split up between deposit to merchant
% and deposit to customer's (own) bank account!
\begin{figure}[h!]
\begin{sequencediagram}

5
doc/flows/kyc-balance.tex
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@ -49,9 +49,10 @@ if required.
\begin{table}[h!]
\caption{Settings for the balance trigger}
\caption{Settings for the balance trigger.}
\begin{tabular}{l|l|r}
{\bf Setting} & {\bf Type} & {\bf Value} \\ \hline \hline
Default AML threshold & Amount & {\em 1000 CHF} \\
KYC threshold & Amount & {\em 5000 CHF} \\
Default AML threshold & Amount & {\em 5000 CHF} \\
\end{tabular}
\end{table}

8
doc/flows/kyc-deposit.tex
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@ -61,11 +61,13 @@
\begin{table}[h!]
\caption{Settings for the deposit trigger}
\caption{Settings for the deposit trigger. Note that the operation
must satisfy all of the given rules.}
\begin{tabular}{l|l|r}
{\bf Setting} & {\bf Type} & {\bf Value} \\ \hline \hline
Allowed bank accounts & RFC 8905 RegEx & {\em CH*} \\ \hline
KYC deposit threshold & Amount & {\em 1000 CHF} \\
Default AML deposit threshold & Amount & {\em 2500 CHF} \\
KYC deposit threshold & Amount/month & {\em 5000 CHF} \\
KYC deposit threshold & Amount/year & {\em 15000 CHF} \\
Default AML deposit threshold & Amount/month & {\em 2500 CHF} \\
\end{tabular}
\end{table}

8
doc/flows/kyc-pull.tex
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@ -68,11 +68,13 @@
\begin{table}[h!]
\caption{Settings for the pull payment trigger}
\caption{Settings for the pull payment trigger. Note that the operation
must satisfy all of the given rules.}
\begin{tabular}{l|l|r}
{\bf Setting} & {\bf Type} & {\bf Value} \\ \hline \hline
Permitted phone numbers & Dialing prefix & {\em +41} \\
P2P KYC threshold & Amount & {\em 100 CHF} \\
Default P2P AML threshold & Amount & {\em 1000 CHF} \\
P2P KYC threshold & Amount/month & {\em 5000 CHF} \\
P2P KYC threshold & Amount/year & {\em 15000 CHF} \\
Default P2P AML threshold & Amount/month & {\em 1000 CHF} \\
\end{tabular}
\end{table}

8
doc/flows/kyc-push.tex
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@ -69,11 +69,13 @@
\begin{table}[h!]
\caption{Settings for the push payment trigger}
\caption{Settings for the push payment trigger. Note that the operation
must satisfy all of the given rules.}
\begin{tabular}{l|l|r}
{\bf Setting} & {\bf Type} & {\bf Value} \\ \hline \hline
Permitted phone numbers & Dialing prefix & {\em +41} \\
P2P KYC threshold & Amount & {\em 100 CHF} \\
Default P2P AML threshold & Amount & {\em 1000 CHF} \\
P2P KYC threshold & Amount/month & {\em 5000 CHF} \\
P2P KYC threshold & Amount/year & {\em 15000 CHF} \\
Default P2P AML threshold & Amount & {\em 1000 CHF} \\
\end{tabular}
\end{table}

15
doc/flows/kyc-withdraw.tex
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@ -30,16 +30,21 @@
\end{center}
\caption{Regulatory process when withdrawing digital cash from a
bank account.
When the transfer is denied the money is (eventually) returned to
If the transfer is denied or the user fails to withdraw the
funds for any other reason, the money is automatically returned
after the bounce period (see Table~\ref{table:kyc:withdraw:settings}) to
the originating bank account.}
\label{fig:kyc:withdraw}
\end{figure}
\begin{table}[h!]
\caption{Settings for the withdraw trigger}
\caption{Settings for the withdraw trigger. Note that the operation
must satisfy all of the given rules.} \label{table:kyc:withdraw:settings}
\begin{tabular}{l|l|r}
{\bf Setting} & {\bf Type} & {\bf Value} \\ \hline \hline
Allowed bank accounts & RFC 8905 RegEx & {\em CH*} \\ \hline
Monthly withdraw maximum & Amount & {\em 1000 CHF} \\
{\bf Setting} & {\bf Type} & {\bf Value} \\ \hline \hline
Allowed bank accounts & RFC 8905 RegEx & {\em CH*} \\ \hline
Withdraw maximum & Amount/month & {\em 5000 CHF} \\
Withdraw maximum & Amount/year & {\em 15000 CHF} \\
Bounce period & Delay & 1 month \\
\end{tabular}
\end{table}

47
doc/flows/main.tex
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@ -37,16 +37,48 @@ The main interactions of the system are:
\item[shutdown] the Taler payment system operator informs the customers that the system is being shut down for good
\end{description}
Taler has no accounts (this is digital cash) and thus there is no ``opening''
or ``closing'' of accounts. The equivalent of ``opening'' an account is thus
to withdraw digital cash. The equivalent of ``closing'' an account is to
either (1) deposit the funds explicitly into a bank account, or (2) the coins
will expire if the wallet was lost (including long-term offline or
{\bf Customers} begin their business relationship with us when they withdraw
digital cash. Taler has no accounts (this is digital cash) and thus there is
no ``opening'' or ``closing'' of accounts for consumers. Given digital cash,
the customers can either (1) deposit the funds explicitly into a bank account
(see Section~\ref{sec:deposit}), (2) pay a merchant (see
Section~\ref{sec:deposit}), (3) pay another customer using a peer-to-peer
transfer (see Sections~\ref{sec:push} and~\ref{sec:pull}), or (4) the coins
will expire if the wallet was lost (including offline for a long time or
uninstalled). Finally, if a wallet remains (occasionally) online but a user
does simply not spend the coins will (3) diminish in value from the change
does simply not spend the coins will (5) diminish in value from the change
fees (see Section~\ref{sec:fees:coin}) that apply to prevent the coins from
expiring outright.
For customers, we will categorically limit of digital cash withdrawn per month
to less than CHF 5000 per month and less than CHF 15000 per year, thus
ensuring that consumers remain below the thresholds where most regulatory
processes become applicable. We will, however, ensure that customers are Swiss
(see Section~\ref{sec:proc:domestic}) by requiring them to have a Swiss bank
account and/or Swiss phone number (+41-prefix). Furthermore, the wallet will
impose an upper limit of CHF 5000 on its balance at any point in time.
For {\bf merchants}, the Taler equivalent of ``opening'' an account and thus
establishing an ongoing business relationship is for a business to receive
payments (see Section~\ref{sec:deposit}) exceeding CHF 5000/month or CHF
15000/year. We will consider the account ``open'' (and require up-to-date KYB
information and check sanction lists) as long as the business has made any
transactions within the last 24 months.
In contrast to normal customers, merchants can in principle {\bf receive}
payments without limit. However, these transactions must go into the bank
account of the business: when digital coins are deposited at a business in
Taler, the business never actually receives usable digital coins but instead
the amount is always directly credited to their bank account. Depending on
the transacted amounts, the business will be subject to KYB
(Section~\ref{sec:proc:kyb}) and AML checks. As we will only transfer money
into the existing bank accounts of the merchants to compensate them for sales
made using the Taler payment system, we do not need to check the origin of
funds for those merchants as they will only receive funds from
us.\footnote{Should businesses want to use Taler for expenditures, they will
need to withdraw digital coins from their bank account just like customers,
and the limits for customers will continue to apply.}
The following sections describe the respective processes for each of these
interactions.
@ -119,7 +151,8 @@ The three main regulatory processes are:
\end{description}
\include{proc-domestic}
\include{proc-kyc}
%\include{proc-kyc}
\include{proc-kyb}
\include{proc-aml}
\chapter{Fees} \label{chap:fees}

2
doc/flows/proc-domestic.tex
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@ -1,4 +1,4 @@
\section{Domestic wallet check}
\section{Domestic wallet check} \label{sec:proc:domestic}
\begin{figure}[h!]
\begin{sequencediagram}