user8653: Is there a google like search engine which can search for any text that is included with a bitcoin transaction? As I understand it each transaction includes 80 characters of text as well.
Update
It is not possible to search the blockchain for text in an easy way

user17067: In fact that text is a blockchain.info extension not really present in the blockchain itself. I can't find any text search method in the query API.

user70119: I found that smartbit.com.au allows you to search for text included in OP_RETURN outputs. 
As an example, searching for "on brink" returns an Eternity Wall message that echos the coinbase of the genesis block.


user12983: There is funny site http://bitcoinstrings.com/ I am not sure that it is what are you looking for but just in case...

user9382: If we're talking about smart contracts and such (which we are) then there's no text to search from contracts and such. The digital contract functionality doesn't work like Blockchain.info comments.
If you're going to use the Blockchain to lodge a patent for example, you're not uploading the actual patent. A hash is being made of the time (ie perhaps the hash of block at that height) and a hash of the document, which is then concatenated and then hashed again. So at it's simplest it's:
hash( hash(Blockchain time data) + hash(Document))

Think of it like this: the patent is in an envelope. The envelope is sealed with wax and stamped with a stamp referencing:

proof of time and 
proof of envelope's contents

The text inside the envelope isn't searchable, whilst Blockchain.info comments (analogous to post-it notes in an accounting ledger) might be, though the usefulness is not the same.

8653: <p>Is there a google like search engine which can search for any text that is included with a bitcoin transaction? As I understand it each transaction includes 80 characters of text as well.</p>

<h2>Update</h2>

<p>It is not possible to search the blockchain for text in an easy way</p>
 17067: <p>In fact that text is a <a href="https://blockchain.info" rel="nofollow">blockchain.info</a> extension not really present in the blockchain itself. I can't find any text search method in the <a href="https://blockchain.info/q" rel="nofollow">query API</a>.</p>
 70119: <p>I found that <a href="https://www.smartbit.com.au/" rel="nofollow noreferrer">smartbit.com.au</a> allows you to search for text included in <code>OP_RETURN</code> outputs. </p>

<p>As an example, searching for "on brink" returns an Eternity Wall message that echos the coinbase of the genesis block.</p>

<p><a href="https://i.stack.imgur.com/uZ9gC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uZ9gC.png" alt="enter image description here"></a></p>
 12983: <p>There is funny site <a href="http://bitcoinstrings.com/" rel="noreferrer">http://bitcoinstrings.com/</a> I am not sure that it is what are you looking for but just in case...</p>
 9382: <p>If we're talking about smart contracts and such (which we are) then there's no text to search from contracts and such. The digital contract functionality doesn't work like Blockchain.info <em>comments</em>.</p>

<p>If you're going to use the Blockchain to lodge a patent for example, you're not uploading the actual patent. A hash is being made of the time (ie perhaps the hash of block at that height) and a hash of the document, which is then concatenated and then hashed again. So at it's simplest it's:</p>

<pre><code>hash( hash(Blockchain time data) + hash(Document))
</code></pre>

<p>Think of it like this: the patent is in an envelope. The envelope is sealed with wax and stamped with a stamp referencing:</p>

<ul>
<li>proof of time and </li>
<li>proof of envelope's contents</li>
</ul>

<p>The text inside the envelope isn't searchable, whilst Blockchain.info comments (analogous to post-it notes in an accounting ledger) might be, though the usefulness is not the same.</p>
