Thanks for the bitcoin donation! And happy to accept your proposal. Just reply to the legit check emails when you derail and let us know you’ve bitcoined us the $5 and we’ll manually unfreeze you.
But we’re keen to understand the bigger issue. Would you be more amenable to authorizing us to charge your Paypal account when you derail? What about giving us your bank account number (Stripe has that feature now for US bank accounts)? Stripe also supports bitcoin but not the way it would need to work for Beeminder – namely, the user pre-authorizing us to automatically charge them. Does @drtall’s suggestion of a disposable credit card address the issue?
Thanks also to @apolyton for the clarifications. It’s true that this is both super safe and that controlling how much Beeminder charges you is quite straightforward. The pledge cap is a prominent part of creating any new goal as of recently. In fact, want to try creating a test goal and see if you agree? Eager for more feedback on this.