Implement leave comments in the blockchain

lizhi

I plan to develop a easy application in blockchain,implement leave comments in blockchain. Use OP_RETURN,Information recorded in the blockchain.

See bitcoin’s blockchain

https://blockchain.info/tx/e9b30933e42b8d8273679b5e71ea33302a0ea5e801313413ec0c5b160dd37cb6?show_adv=true

OP_RETURN 30205468697320697320612074657374206465636c61726174696f6e2062792074686520686561 
(decoded) j'0 This is a test declaration by the hea

This is a proof of existence.

How to use it

See News http://www.coindesk.com/monegraph-uses-block-chain-verify-digital-assets/

What is OP_RETURN?

OP_RETURN is a custom transaction locking script that can store data, but nothing beyond that, the execution of the script will be terminated immediately when bitcoin nodes encounter UTXOs that contain it - this means that you wonâ€™t be able to spend that transaction output.

When using OP_RETURN properly you will also avoid destroying coins.

Limitations

OP_RETURN scripts are limited to 40 bytes, this is enough for a SHA-256 checksum (32 bytes) with 8 bytes of prefix or for a shortened URL
There can be only one OP_RETURN per transaction

mirrax

Bravo Lizhi!

ghostlander

Transaction comments can be implemented without coin destruction.

lizhi

I find some php codes can operate blockchain :)

Examples:
php send-OP_RETURN.php 149wHUMa41Xm2jnZtqgRx94uGbZD9kPXnS 0.001 ‘Hello, blockchain!’
php send-OP_RETURN.php 149wHUMa41Xm2jnZtqgRx94uGbZD9kPXnS 0.001 48656c6c6f2c20626c6f636b636861696e21
php send-OP_RETURN.php mzEJxCrdva57shpv62udriBBgMECmaPce4 0.001 ‘Hello, testnet blockchain!’ 1

lizhi

OP_RETURN 48656c6c6f2c20626c6f636b636861696e21 , It is binary code,The content is Hello, blockchain!

lizhi

Wait tow days ,My pool find a block, those transaction can be comfirmed, thank my miner.

Look ,It is bitcoin’s wall. http://coinsecrets.org/ I want to build a similar in wallet client.

lizhi

today , feathercoin’s blockchain have first message. :)

MrWyrm

Love you lizhi!

kris_davison

That last post is not related to this thread bit its a pretty cool video. Should I flag this user as a spammer?

I have flagged his account as a spammer. As this is not the first video he has posted randomly around the forum.

lizhi

I will update blockchain explore, Let it show comments in the blockchain.

php send-OP_RETURN.php 71whQbi6pq2aCSvMvcTKCcTZDfAbUvf2Se 0.01 ‘Hello, world!’
TxID: ac4e1d87459007ffbbb258351756d5bba69daad8d1e639d6be59917ff786ada9

update files

featherinsight\public\views\transaction\tx.html

decode {{vout.scriptPubKey.asm | lowercase}}

lizhi

On your lunch hour today, I finished the development of comments in our blockchain. New blockchain explore can show your comments .

See it http://block.ftc-c.com/tx/ac4e1d87459007ffbbb258351756d5bba69daad8d1e639d6be59917ff786ada9

See it again http://block.ftc-c.com/tx/292b0ce6eca79736cb0b58615ad4e38d7310311ebbb4be7e31de20acf64e830f

another :

lizhi

How to insert my content into feathercoin’s blockchain ?

php send-OP_RETURN.php 71whQbi6pq2aCSvMvcTKCcTZDfAbUvf2Se 0.01 ‘Hello, blockchain!’

https://github.com/coinspark/php-OP_RETURN

How to look my content ?

After send your transaction 24 hours ,open block.ftc-c.com , input your TxID. then you can see it. :)

Happy new year, 2015.

I finished all development of 0.9.3 core .

mirrax

link to latest version of 0.9.3 please? I can’t find it anywhere.

lizhi

link to latest version of 0.9.3 please? I can’t find it anywhere.

http://www.ftc-c.com/pack/feathercoin-qt.rar

kris_davison

That’s great lizhi.
Its just a shame I don’t understand exactly how it does it!

Would you be able to write a little walk through of how to create the block chain comment.?

mirrax

Maybe it is time to wish happy new year to
7JRE7WbJNyXJjuauKox2Fnncx6wWLByQVu

?

lizhi

That’s great lizhi.
Its just a shame I don’t understand exactly how it does it!

Would you be able to write a little walk through of how to create the block chain comment.?

I will join it into 0.9.3 core wallet, It is very handy.

kris_davison

That’s a great idea.

lizhi

Today , I finished the development , Add a “Comment” Menu , You can insert some texts into blockchain.

Look , Click New Menu,

Input your words, Click “Inert”.

Then , you go to block explore ( block.ftc-c.com , it base on core wallet .) You will see that you input words.

You need to download feathercoin 0.9.3 core wallet. http://www.ftc-c.com/pack2/feathercoin-qt.rar

A my transaction is http://block.ftc-c.com/tx/4efb6999449abe367124a3440ba41346eb2017d3530876cdb21fc602294585a0

Because there is not enough 0.9.3 nodes now, You may commit transaction to block.ftc-c.com, http://block.ftc-c.com/tx/send

hcf27

This is actually quite big news! we should get it out there… I will start by posting it on my blog since bitcointalk seems to be down!

http://bitcoincommunityblog.org/post/108824940558/ftccommentsblockchain

Congrats Lizhi !!!