How can I prove that I did a payment in bitcoin?

[blisscan]

Hi,

I participate in a coop and I dream about replacing EUR for BTC. Let's say that every member has to pay a fee. How can we check who has payed and who has not payed? I know that every payment generates a transaction and each transaction has a source address, but is there any way to prove that you were the one that did the transaction?

Thanks!

[escrow.ms]

Member can sign a message from the same bitcoin address he used to send funds.

[cbhelp]

You can either assign a separate payment address to each person, and only give the address to that person so you know who paid and who did not, or you can have the senders sign a message with their payment.  The signing part is above the heads of most new btc users, so I would opt for the first option.

[blisscan]

Aha! Thanks! I didn't know that the private key in a wallet could be used to sign a random message. Now I just checked my MultiBit and, sure enough, there is an option to "tools->sign message". Amazing!

And the idea of giving a different address to each payer is beautifully simple. Thanks for your answers!

[DannyHamilton]

You can either assign a separate payment address to each person, and only give the address to that person so you know who paid and who did not, or you can have the senders sign a message with their payment.  The signing part is above the heads of most new btc users, so I would opt for the first option.

This!

Each member has their own coop bitcoin address that they pay to.  It doesn't (shouldn't?) matter who makes the payment to that address.  As long as that address is paid, then that member's account is up to date.

[DannyHamilton]

You can either assign a separate payment address to each person, and only give the address to that person so you know who paid and who did not, or you can have the senders sign a message with their payment.  The signing part is above the heads of most new btc users, so I would opt for the first option.

This!

Each member has their own coop bitcoin address that they pay to.  It doesn't (shouldn't?) matter who makes the payment to that address.  As long as that address is paid, then that member's account is up to date.

Better yet.  If each member receives an invoice or bill indicating payment due, then they can have a new address generated for each payment, and the address can be printed on the invoice in both text and QRcode format.  That way you can identify the specific bill that was paid.

[blisscan]

Better yet.  If each member receives an invoice or bill indicating payment due, then they can have a new address generated for each payment, and the address can be printed on the invoice in both text and QRcode format.  That way you can identify the specific bill that was paid.

That's the perfect solution. A different address for each payment. Then it is really easy to verify what has been paid and what is still pending.

The more I learn about btc the more I like it. So many advantages!

[marcovaldo]

You can give a different address for every payment.

[Grandsmall]

You can give a different address for every payment.

That was already established.

[marcovaldo]

That was already established.

Yes, by cbhelp and Danny.
But I confirm it is the best way.

[Grandsmall]

That was already established.

Yes, by cbhelp and Danny.
But I confirm it is the best way.

This is not the blockchain, no need for confirmations.

[cbhelp]

Did you get it all sorted out?

[hek92]

You can be given a unique address where you can deposit you fee and after that the fee can be used by site.Site will have a record of transactions of that address.

[blisscan]

Thanks for all your answers. The solution is clear to me now.

[DannyHamilton]

IF you're satisfied with your answers, you may want to click the "lock topic" link in the lower left corner of the page.

Otherwise random people will keep stumbling across this thread in searches and they'll  keep bumping it with their own suggestions and advice.

[blisscan]

Thanks DannyHamilton. I will lock the topic.