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Author Topic: Validate Bitcoin address thru web api or php  (Read 9491 times)
likl3sfuhjh (OP)
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May 06, 2013, 11:41:21 PM
 #1

I have a database of bitcoin addresses and i need to validate them. Please explain the process , i don't care if its an api or a script as long as its efficient.

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minzie
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May 06, 2013, 11:46:09 PM
 #2

What do you mean by 'validate' exactly?

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likl3sfuhjh (OP)
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May 06, 2013, 11:47:18 PM
 #3

to see if its a real address

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May 06, 2013, 11:53:10 PM
 #4

Not sure what you understand by “real”. This thread provides validation functions if various languages. You can only check if the address is valid. If by real you mean that someone is actually using this address (someone has a private key), then you can't know that.

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May 07, 2013, 12:16:35 AM
 #5

In PHP JSON-RPC you can use this code:

Code:
$isvalid = $bitcoin->validateaddress($address);
if($isvalid['isvalid']) {
//Address valid
}
likl3sfuhjh (OP)
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May 07, 2013, 03:41:11 AM
 #6

In PHP JSON-RPC you can use this code:

Code:
$isvalid = $bitcoin->validateaddress($address);
if($isvalid['isvalid']) {
//Address valid
}





how can that be used in on a website that dosnt have access to the bitcoin client


https://blockchain.info/api/json_rpc_api
i guess i can use this right?

Where do I get free bitcoins?
www.bitcoinforest.com - Bitcoin faucet and survey site. Get .001 bitcoins for each survey, and .00001 for each captcha.
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May 07, 2013, 03:52:07 AM
 #7

You can do it without a bitcoind node.

Look up the base58check routines.  There are several PHP implementations available.  Basically, that is all a bitcoind node would do.  (If the address belonged to a known key, it would provide other info too, but that doesn't matter.)

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likl3sfuhjh (OP)
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May 07, 2013, 04:29:58 AM
 #8

someone explain to me how to use the json rpc, with blockchains api. There is little to no documentation i want to stop wasting my time with this. Just help me.

Where do I get free bitcoins?
www.bitcoinforest.com - Bitcoin faucet and survey site. Get .001 bitcoins for each survey, and .00001 for each captcha.
robin0van0der0vliet
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May 07, 2013, 12:19:28 PM
 #9

<?php

function checkAddress($address)
{
    
$origbase58 $address;
    
$dec "0";

    for (
$i 0$i strlen($address); $i++)
    {
        
$dec bcadd(bcmul($dec,"58",0),strpos("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz",substr($address,$i,1)),0);
    }

    
$address "";

    while (
bccomp($dec,0) == 1)
    {
        
$dv bcdiv($dec,"16",0);
        
$rem = (integer)bcmod($dec,"16");
        
$dec $dv;
        
$address $address.substr("0123456789ABCDEF",$rem,1);
    }

    
$address strrev($address);

    for (
$i 0$i strlen($origbase58) && substr($origbase58,$i,1) == "1"$i++)
    {
        
$address "00".$address;
    }

    if (
strlen($address)%!= 0)
    {
        
$address "0".$address;
    }

    if (
strlen($address) != 50)
    {
        return 
false;
    }

    if (
hexdec(substr($address,0,2)) > 0)
    {
        return 
false;
    }

    return 
substr(strtoupper(hash("sha256",hash("sha256",pack("H*",substr($address,0,strlen($address)-8)),true))),0,8) == substr($address,strlen($address)-8);
}

?>

Here is a PHP function to validate a bitcoin address. Wink
likl3sfuhjh (OP)
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May 07, 2013, 09:42:53 PM
 #10

thanks, i figured it out myself using the blockchain json rpc api. Ill try that code you took the time to post also thanks.


Code:
<?php
require_once('jsonrpcphp/includes/jsonRPCClient.php');
/** SIMPLE BITCOIN JSON RPC PHP**/
 
$btc_connect = array("user" => "",            
            
"pass" =>   "",                   
            
"host" =>   "blockchain.info",                     
            
"port" =>   80);                        
 
 
//create an array with connection settings
 
$bitcoin = new jsonRPCClient("http://{$btc_connect['user']}:{$btc_connect['pass']}@{$btc_connect['host']}:{$btc_connect['port']}");

$address 'bitcoinaddress';
$isvalid $bitcoin->validateaddress($address);
if($isvalid['isvalid']) {
//Address valid
}
else{
echo '---------'.$address.'---------';
}
?>


Where do I get free bitcoins?
www.bitcoinforest.com - Bitcoin faucet and survey site. Get .001 bitcoins for each survey, and .00001 for each captcha.
robin0van0der0vliet
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May 08, 2013, 08:42:59 PM
 #11

thanks, i figured it out myself using the blockchain json rpc api. Ill try that code you took the time to post also thanks.


Code:
<?php
require_once('jsonrpcphp/includes/jsonRPCClient.php');
/** SIMPLE BITCOIN JSON RPC PHP**/
 
$btc_connect = array("user" => "",            
            
"pass" =>   "",                   
            
"host" =>   "blockchain.info",                     
            
"port" =>   80);                        
 
 
//create an array with connection settings
 
$bitcoin = new jsonRPCClient("http://{$btc_connect['user']}:{$btc_connect['pass']}@{$btc_connect['host']}:{$btc_connect['port']}");

$address 'bitcoinaddress';
$isvalid $bitcoin->validateaddress($address);
if($isvalid['isvalid']) {
//Address valid
}
else{
echo '---------'.$address.'---------';
}
?>

The code I posted is much faster than this, and does not need to connect to any other server (such as blockchain.info). Wink
minzie
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May 09, 2013, 01:04:10 AM
 #12

Sometimes speed is not an issue.

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dave111223
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July 15, 2014, 04:28:44 PM
 #13

The code I posted is much faster than this, and does not need to connect to any other server (such as blockchain.info). Wink

The code you posted does not work with multisig addresses
DeathAndTaxes
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July 15, 2014, 10:32:25 PM
 #14

The code I posted is much faster than this, and does not need to connect to any other server (such as blockchain.info). Wink

The code you posted does not work with multisig P2SH addresses

Minor correction.  There actually is no "multisig addresses" just Pay2PubKeyHash addresses and Pay2ScriptHash addresses.  The code provided only properly handles the former.
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