PHP address validator (non JSON-RPC)

[Alex Beckenham]

Hi,

I'm wondering if someone has coded a simple bitcoin address validator for PHP that works without a connection to bitcoind.

I thought I had one, but now I can't seem to find it.

Thanks,
Alex

[1714052494]

1714052494

[1714052494]

1714052494

[1714052494]

1714052494

[theymos]

I published this a long time ago, but few people seem to use it:
http://pastebin.com/vmRQC7ha

[Alex Beckenham]

I published this a long time ago, but few people seem to use it:
http://pastebin.com/vmRQC7ha

Thanks, that's just what I was looking for... What are the PHP requirements for this?

If I'm using PHP5, do I need to add anything else to the install?

Thanks.

[theymos]

It requires the bcmath PHP extension, which is usually included by default in binary releases of PHP. Nothing else is required.

[Alex Beckenham]

It requires the bcmath PHP extension, which is usually included by default in binary releases of PHP. Nothing else is required.

Thanks, I'm sure an early member like you has a few coins already but I just sent you a tip. Very useful bit of code.

[theymos]

Thanks!

[crazy_rabbit]

I just found this script and I find it really useful, so I wanted to say thanks as well!

I had a question, can I use it only for testing the validity of a BTC address or can the functions inside the script be used for other purposes as well?

thanks,

[theymos]

I had a question, can I use it only for testing the validity of a BTC address or can the functions inside the script be used for other purposes as well?

You can use it for other things. The base58 functions can be used for working with other address formats, for example.

[[Tycho]]

I published this a long time ago, but few people seem to use it:
http://pastebin.com/vmRQC7ha

Will it validate 17FSKMPAyXGR7EQziCqbVfwleGumRosQoh as correct or not ?

[theymos]

Will it validate 17FSKMPAyXGR7EQziCqbVfwleGumRosQoh as correct or not ?

It says that that address is invalid, which seems correct.

[[Tycho]]

It says that that address is invalid, which seems correct.

Nice. There was a similar validator showing it as valid :)

[theymos]

Oh, checkAddress actually says that that's valid. My web interfaces all check base58 validity before using checkAddress... I'll update it soon to fix this.

[matmar10]

I published this a long time ago, but few people seem to use it:
http://pastebin.com/vmRQC7ha

Thanks for posting this! It's the best one I've found so far... I've run about 50 public keys through using PhpUnit through so far and it correctly validated them :-)

[bitcoinget]

I found a couple more false positives with the validation code:

1Sq2Pb5pCfPBKZ3U4SFjHMlhvAbz8Vpjk
1C8UDzgYqlhFqduhYzuAjlMQZWBvYahvD1

Is there an updated version of the code somewhere? Thanks.

[SgtSpike]

Oooh, going to integrate this into one of my scripts as well.

[canadiannomad]

Sorry to revive this topic, but I wanted to update it to mention that I took the above script and quickly converted it to a class so we don't contaminate our name spaces so much...  Also added the TestNet address version.
http://pastebin.com/nvmQJBAm

[elbandi]

Sorry to revive this topic, but I wanted to update it to mention that I took the above script and quickly converted it to a class so we don't contaminate our name spaces so much...  Also added the TestNet address version.
http://pastebin.com/nvmQJBAm

maybe a generic address tester, like this:

Code:

abstract class CoinValidator {
 private $addressversion = "00"; //this is a hex byte
 abstract protected function getAddressVersion($testnet);

 public function __construct($testnet = false)
    {
        $this->addressversion = $this->getAddressVersion($testnet);
    }
 ...
}

class BitCoinValidator extends CoinValidator {
  protected function getAddressVersion($testnet) {
    return ($testnet) ? "6F" : "00"; //TestNet vs ProductionNet
  }
}

class LiteCoinValidator extends CoinValidator {
  protected function getAddressVersion($testnet) {
    return ($testnet) ? "6F" : "30"; //TestNet vs ProductionNet
  }
}

class FooCoinValidator extends CoinValidator {
  protected function getAddressVersion($testnet) {
    return ($testnet) ? "XX" : "XX"; //TestNet vs ProductionNet
  }
}
...

Elbandi

[Seal]

I found a couple more false positives with the validation code:

1Sq2Pb5pCfPBKZ3U4SFjHMlhvAbz8Vpjk
1C8UDzgYqlhFqduhYzuAjlMQZWBvYahvD1

Is there an updated version of the code somewhere? Thanks.

bump.

Any take on this? Those addresses seem valid to me??

[theymos]

If you're using my checkAddress, do this:

Code:

if(!preg_match('/^[1-9A-HJ-NP-Za-km-z]{20,40}$/', $address) || !checkAddress($address) )
    invalid address

My checkAddress assumes that the input is valid base58.

The PHP should probably be rewritten to be more efficient.

[Zickafa]

What is the advantage in validator for PHP that works without a connection to bitcoind?