Using bitcoin addresses for captcha.....

[Bitcoin Oz]

 What if you took bitcoin address and turned them into firstbits style addresses and displayed them and users need to enter that correctly as the captcha ?

Can you display only parts of bitcoin addresses in this way programatically ?

[Raoul Duke]

What if you took bitcoin address and turned them into firstbits style addresses and displayed them and users need to enter that correctly as the captcha ?

Can you display only parts of bitcoin addresses in this way programatically ?

What's the diference between that and just grabbing 5 or 6 random letters/numbers?

[Bitcoin Oz]

What if you took bitcoin address and turned them into firstbits style addresses and displayed them and users need to enter that correctly as the captcha ?

Can you display only parts of bitcoin addresses in this way programatically ?

What's the diference between that and just grabbing 5 or 6 random letters/numbers?

You cant pay a normal captcha instead of solving it

Sometimes they are so difficult to solve I just want to tip them a satoshi to let me use the friggin site!

[Xenland]

I could see this working if it required a scan of a qr code and then typing it in but i guess that wouldnt work becuase a bot could read qr codes... Idk

[Xenland]

What if you took bitcoin address and turned them into firstbits style addresses and displayed them and users need to enter that correctly as the captcha ?

Can you display only parts of bitcoin addresses in this way programatically ?

What's the diference between that and just grabbing 5 or 6 random letters/numbers?

You cant pay a normal captcha instead of solving it

Sometimes they are so difficult to solve I just want to tip them a satoshi to let me use the friggin site!

Oh i get it : pay this tiny amount to signup and to prove your not a bot

[Bitcoin Oz]

What if you took bitcoin address and turned them into firstbits style addresses and displayed them and users need to enter that correctly as the captcha ?

Can you display only parts of bitcoin addresses in this way programatically ?

What's the diference between that and just grabbing 5 or 6 random letters/numbers?

You cant pay a normal captcha instead of solving it

Sometimes they are so difficult to solve I just want to tip them a satoshi to let me use the friggin site!

Oh i get it : pay this tiny amount to signup and to prove your not a bot

Under this system that is entirely optional.

[Raoul Duke]

What's the diference between that and just grabbing 5 or 6 random letters/numbers?

You cant pay a normal captcha instead of solving it

Sometimes they are so difficult to solve I just want to tip them a satoshi to let me use the friggin site!

Yes, you can pay a normal captcha... http://de-captcher.com is just one of the dozens of sites that have OCR and human solving available for as much as $2 for 1000 captcha solutions.

Oh i get it : pay this tiny amount to signup and to prove your not a bot

That will not prove you're not a bot as any bot can do that. Scraping the page to see which amount to send to which address and sending a json-RPC command to bitcoind isn't that difficult.

[Xenland]

Whats if the amount is in an image format

[Bitcoin Oz]

Whats if the amount is in an image format

That would require humans

If its an image it can also be an AD.

[Raoul Duke]

Whats if the amount is in an image format

That would require humans

That would require OCR or a service like de-captcher. Currently most captchas are images and that doesn't stop spammers. At most you would only double the cost to solve it, nothing more.

You guys are free to implement it. I'll try and break it and if you want.

BTW, the best captchas around are the one that is used on the Bitcoin Faucet(impossible for a bot to solve) and those SolveMedia ones, which may require 2 or 3 tries, but eventually will be solved.

[Bitcoin Oz]

Whats if the amount is in an image format

That would require humans

That would require OCR or a service like de-captcher. Currently most captchas are images and that doesn't stop spammers. At most you would only double the cost to solve it, nothing more.

You guys are free to implement it. I'll try and break it and if you want.

BTW, the best captchas around are the one that is used on the Bitcoin Faucet(impossible for a bot to solve) and those SolveMedia ones, which may require 2 or 3 tries, but eventually will be solved.

What if you show a full address but highlight the letters and numbers randomly ? It would be an actual working address and the amount to bypass it would be in a pic too.

[Bitcoin Oz]

I actually have a site in mind for this based on the blockchain that works like 4chan.

[Raoul Duke]

Whats if the amount is in an image format

That would require humans

That would require OCR or a service like de-captcher. Currently most captchas are images and that doesn't stop spammers. At most you would only double the cost to solve it, nothing more.

You guys are free to implement it. I'll try and break it and if you want.

BTW, the best captchas around are the one that is used on the Bitcoin Faucet(impossible for a bot to solve) and those SolveMedia ones, which may require 2 or 3 tries, but eventually will be solved.

What if you show a full address but highlight the letters and numbers randomly ? It would be an actual working address and the amount to bypass it would be in a pic too.

If you use html to higlight the letters and numbers it can and will be detected by more advanced bots.
If you use a picture to show the full address, nobody will have the guts to write it and send the coin lol

[Bitcoin Oz]

but what if you used your own set of html tags like

Code:

<firstbits>17ocNsU</firstbits>RFKC<bitcoinsarefun>sGarEiqEgzMx</bitcoinsarefun>xS9WnWAmP6P

and you can randomly set where they show up and can confuse bots at least

 

[Raoul Duke]

but what if you used your own set of html tags like

Code:

<firstbits>17ocNsU</firstbits>RFKC<bitcoinsarefun>sGarEiqEgzMx</bitcoinsarefun>xS9WnWAmP6P

and you can randomly set where they show up and can confuse bots at least

Oh, that would be bypassed in less than 1 minute. Yes, 1 minute would be what I would need to program a bot to scrape your personalized tags lol regex included. Even if you randomized them, would all be a matter of training and time.

You would be surprised with the bots Russians sell nowadays
ZennoPoster is unstopable Well, that captcha in the faucet would stop it, but that's one of the few.
Any captcha involving text, be it on the page source or on an image is pretty much dead on arrival.
You may not believe it, but I've seen captcha systems that involve composing the image from several smaller images: No problem, it screenshots the page and crops the screenshot and sends the part with the captcha to the captcha solving service.
The only ones that are trully working are the ones that involving recognizing an object(non-text) between 3 or 4 pictures or, like I said, the one used on the faucet.

[Raoul Duke]

In Russia captcha solves you.

Now that was funny ROFL

[Xenland]

What about combining the image idea along with the highlighted areas?

Or if you absolutly had to use text you could colorize the bitcoin address with 10 different colors and then in an image tell the user what color selected. No bot could solve that! Okay the bot could guess but it would only be correct once out of every ten tries(more times if your lucky)

[Gareth Nelson]

Hashcash returns

[chmod755]

1.Captcha shows a Bitcoin address + a random number of BTC to pay
2.User pays x.xxxxxxxx BTC
3.User gets 90-99% of his/her coins back after 14 days (unless he/she has been reported by the owner of the website)

[hazek]

1.Captcha shows a Bitcoin address + a random number of BTC to pay
2.User pays x.xxxxxxxx BTC
3.User gets 90-99% of his/her coins back after 14 days (unless he/she has been reported by the owner of the website)

This similar to what I figured would be a good idea, the only way to fight bots is with your own bots detecting malicious users. Make them pay a high price to solve the bitcoin captcha, use a bot to monitor if they are spamming, if they are, confiscate their money, if they are not, return it after a period of time.