Verify a signed message in PHP. Without downloading anything

[BitTalkyy]

First go to http://www.blockchain.info/ and create a wallet.
Copy down the identifier.
Download the lite version of JSON-RPC PHP Client. http://jsonrpcphp.org/?page=download&lang=en

Include it in your php file, you want to use it.
Write your connect script like this:

$bitcoin = new jsonRPCClient('http://user:password@rpc.blockchain.info/');

Next, create some variables:

$message = Your message; $address = Address; $signature = Signature

Create another variable that will have a value of true or false. This indicates the validity of the message.

$sig_valid = $bitcoin->verifymessage($address,$signature,$message)

Now check the state:

if($sig_valid) { //valid } else { //invalid }

So, for the lazy people, here's the full code:

<?php
require_once 'jsonRPCClient.php';
$bitcoin = new jsonRPCClient('http://user:password@rpc.blockchain.info/');

$address;
$message;
$signature;

$sig_valid = $bitcoin->verifymessage($address,$signature,$message);
if($sig_valid) {
     //valid
} else {
     //invalid
}

?>

You can do more things with this: https://blockchain.info/hu/api/json_rpc_api

Happy programming! I'll post more programming tutorials soon! Also, if you have an idea, PM me and we can team up on it.

Tips are appreciated: 1Tipo4u5vkaNDjPd5A4wxPxmR4bEp8Bdb

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[shorena]

Whats the benefit if you rely on an API anyway?

[BitTalkyy]

Whats the benefit if you rely on an API anyway?

You can save a lot of bandwidth and disk space. Also, it's much easier

[shorena]

Whats the benefit if you rely on an API anyway?

You can save a lot of bandwidth and disk space. Also, it's much easier

https://chainquery.com/bitcoin-api/verifymessage

[silverleafy]

Why use the blockchain.info api? Blockchain.info has a terrible track record and their service isn't all that great. I would not use their api.

[QUEDOS]

Whats the benefit if you rely on an API anyway?

You reduce stress on disk space and you can cut back on bandwidth usage at the same time

[Abdussamad]

Use this library and do it locally:

https://github.com/Bit-Wasp/bitcoin-php

[BitTalkyy]

Use this library and do it locally:

https://github.com/Bit-Wasp/bitcoin-php

That script requires some extensions, my version is pure PHP

[coinableS]

Gotta love it here, it's become as toxic as a children playground! You all need to grow up.
A newb posts a how-to with good intentions to educate or help others. What's the response? BC.info sucks, why are you using API, you should do it with this library instead, you should host a full node on your server and do JSON RPC, etc. 
Who cares what you think about BC.info and their wallet service? He's not telling anyone to store coins there. Their API is a free service that is actually useful, but you all like to take the popular choice that BC.info sucks, no matter the usage or implementation.

It's easy to be a critic. Why you don't you create your own how to's or tutorials?

[BitTalkyy]

Gotta love it here, it's become as toxic as a children playground! You all need to grow up.
A newb posts a how-to with good intentions to educate or help others. What's the response? BC.info sucks, why are you using API, you should do it with this library instead, you should host a full node on your server and do JSON RPC, etc. 
Who cares what you think about BC.info and their wallet service? He's not telling anyone to store coins there. Their API is a free service that is actually useful, but you all like to take the popular choice that BC.info sucks, no matter the usage or implementation.

It's easy to be a critic. Why you don't you create your own how to's or tutorials?

I don't know if you're hating on me, but I didn't say to anyone to use that wallet. It's required to log onto the RPC Server

[coinableS]

Gotta love it here, it's become as toxic as a children playground! You all need to grow up.
A newb posts a how-to with good intentions to educate or help others. What's the response? BC.info sucks, why are you using API, you should do it with this library instead, you should host a full node on your server and do JSON RPC, etc. 
Who cares what you think about BC.info and their wallet service? He's not telling anyone to store coins there. Their API is a free service that is actually useful, but you all like to take the popular choice that BC.info sucks, no matter the usage or implementation.

It's easy to be a critic. Why you don't you create your own how to's or tutorials?

I don't know if you're hating on me, but I didn't say to anyone to use that wallet. It's required to log onto the RPC Server

Not at all, I was hating on all the others that were bashing your tutorial. I sent you a tip.

[BitTalkyy]

Gotta love it here, it's become as toxic as a children playground! You all need to grow up.
A newb posts a how-to with good intentions to educate or help others. What's the response? BC.info sucks, why are you using API, you should do it with this library instead, you should host a full node on your server and do JSON RPC, etc. 
Who cares what you think about BC.info and their wallet service? He's not telling anyone to store coins there. Their API is a free service that is actually useful, but you all like to take the popular choice that BC.info sucks, no matter the usage or implementation.

It's easy to be a critic. Why you don't you create your own how to's or tutorials?

I don't know if you're hating on me, but I didn't say to anyone to use that wallet. It's required to log onto the RPC Server

Not at all, I was hating on all the others that were bashing your tutorial. I sent you a tip.

Oh, thank you then!

[fbueller]

Use this library and do it locally:

https://github.com/Bit-Wasp/bitcoin-php

That script requires some extensions, my version is pure PHP

Your script requires extensions too - JSON and cURL support are extensions.

[avatar_kiyoshi]

Nice tutorial, don't bashing a newbie guys, moreover he's not want to robbed your coin.
nice works!

Use this library and do it locally:

https://github.com/Bit-Wasp/bitcoin-php

That script requires some extensions, my version is pure PHP

Your script requires extensions too - JSON and cURL support are extensions.

Well this is right, op script is not pure php. but the script is simple I think, easy to understand.

[lightenx]

Nah, I think OP's script is good enough. Not perfect tho