user22892: Is there any way to check for this data in blockchain? 
I want to search this value: 554e6963444320 and want to return this transaction https://blockchain.info/tx/7e92e90f221ad28daf42b5b8bda4c8e244e37af48527fcd12b2518db5d3315bd

user9382: The Chain.com API offers functionality for returning OP_RETURN data by:

Address
TxID
Block height

The JSON return data from the REST API has a text field which is meant to be the decoded hex data sent (ie 6a``hex data) but it's returned in the format \\x``hex data.
In Python you can simply do this:
import __future__
import requests; from binascii import unhexlify
rdata = requests.get("https://api.chain.com/v2/bitcoin/addresses/%s/op-returns?api-key-id=DEMO-4a5e1e4" % "1Bj5UVzWQ84iBCUiy5eQ1NEfWfJ4a3yKG1") # substitute URL here
assert rdata.status_code == 200
jdata = rdata.json()
hexdata = [unhexlify(str(t["text"]).encode("utf-8"))) for t in jdata
print(hexdata)


user18939: This Blockchain explorer: https://blockchair.com/ allows you to search for embedded data in 19 different Blockchains. And on this URL https://bitcoinstrings.com/all I think you can get all embedded texts.

22892: <p>Is there any way to check for this data in blockchain? </p>

<p>I want to search this value: 554e6963444320 and want to return this transaction <a href="https://blockchain.info/tx/7e92e90f221ad28daf42b5b8bda4c8e244e37af48527fcd12b2518db5d3315bd" rel="nofollow">https://blockchain.info/tx/7e92e90f221ad28daf42b5b8bda4c8e244e37af48527fcd12b2518db5d3315bd</a></p>
 9382: <p>The <a href="https://chain.com/docs" rel="nofollow">Chain.com API</a> offers functionality for returning <em>OP_RETURN</em> data by:</p>

<ol>
<li><a href="https://api.chain.com/v2/bitcoin/addresses/1Bj5UVzWQ84iBCUiy5eQ1NEfWfJ4a3yKG1/op-returns?api-key-id=DEMO-4a5e1e4" rel="nofollow">Address</a></li>
<li><a href="https://api.chain.com/v2/bitcoin/transactions/4a7d62a4a5cc912605c46c6a6ef6c4af451255a453e6cbf2b1022766c331f803/op-return?api-key-id=DEMO-4a5e1e4" rel="nofollow">TxID</a></li>
<li><a href="https://api.chain.com/v2/bitcoin/blocks/308920/op-returns?api-key-id=DEMO-4a5e1e4" rel="nofollow">Block height</a></li>
</ol>

<p>The JSON return data from the REST API has a <code>text</code> field which is meant to be the decoded hex data sent (ie <code>6a``hex data</code>) but it's returned in the format <code>\\x``hex data</code>.</p>

<p>In Python you can simply do this:</p>

<pre><code>import __future__
import requests; from binascii import unhexlify
rdata = requests.get("https://api.chain.com/v2/bitcoin/addresses/%s/op-returns?api-key-id=DEMO-4a5e1e4" % "1Bj5UVzWQ84iBCUiy5eQ1NEfWfJ4a3yKG1") # substitute URL here
assert rdata.status_code == 200
jdata = rdata.json()
hexdata = [unhexlify(str(t["text"]).encode("utf-8"))) for t in jdata
print(hexdata)
</code></pre>
 18939: <p>This Blockchain explorer: <a href="https://blockchair.com/" rel="nofollow noreferrer">https://blockchair.com/</a> allows you to search for embedded data in 19 different Blockchains. And on this URL <a href="https://bitcoinstrings.com/all" rel="nofollow noreferrer">https://bitcoinstrings.com/all</a> I think you can get all embedded texts.</p>
