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Questions tagged [op-return]

An opcode that allows you to create an unspendable transaction output that stores up to 80 bytes of data.

2
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1answer
50 views

What's the deal with OP_RETURN and length?

It seems like most OP_RETURN transactions include length as the first byte after the OP_RETURN code. Is this specified anywhere? Also, the length is sometimes the entire length of the rest of the ...
0
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1answer
37 views

Consensus roles for op_return

What is the validation rule, not policy, for op_return? What is the maximum length of the data that can be attached? Is it 514 bytes? As if the maximum script size was 520 bytes -1 byte for the ...
2
votes
1answer
230 views

OP_RETURN max bytes clarification

I've read that an OP_RETURN opcode allows up to 80 arbitrary bytes to be used in an unspendable transaction. My question is, how is it possible that in this famous transaction (...
2
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1answer
233 views

OP_RETURN in a coinbase transaction?

Hey looking at this transaction I'm confused why there are two outputs and why one of them is labelled with OP_RETURN
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0answers
28 views

How was OP_return used to spend any utxo in 2010? [duplicate]

In the bitcoin wiki it says OP_RETURN is used to make utxos unspendable ,so how was it used to spend any utxo in 2010? Also how would a raw transaction like that look as well as the scriptsig of ...
1
vote
1answer
464 views

What's with this address 1111111111111111111114oLvT2?

It was the burn address with the most BTC received in 2017 according to http://bitcoinwhoswho.com/blog/2017/12/30/8-97-bitcoins-burned-in-2017/. It's Hash160 is ...
2
votes
1answer
128 views

Why is there an output with op-return in regtest mode?

Here is an output from getrawtransaction: { "txid": "a2b9e3aa4adeb68a9b8b8b0bbc8d4890585cd711e89cda83e7f236397fac6218", "hash": "6d96c04d49eefe3eab4934188841ef3592c818bf789517b90b1f71ff75a14c26",...
4
votes
1answer
455 views

Bitcoin Protocol OP_RETURN + Omni USDT Tether + CoPay Multisig Help

I have been asked to recover some tether that have been sent to the wrong address... Sitting on the blockchain in a multisig copay account. I have written small php command line tools to reproduce ...
0
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1answer
386 views

Create an OP_RETURN tx and validate it's existence in Regtest

A part of my MSc thesis is storing the hash of a string with OP_RETURN tx in the Blockchain to exist as a proof. My main concerns are: -how can i send this tx successfully to my regtest network -...
0
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1answer
61 views

Is possible specify who can send bitcoins to me?

I have an idea to store data in OP_RETURN, but… The main problem is it need to easy to review all the transactions. I mean, every user need to have access to the OP_RETURN, giving the public key ...
1
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2answers
576 views

Convert plaintext script into hex-encoded script in python

I'm creating a program (for an altcoin I'm developing) that should make it easy to create OP_RETURN transactions. Currently I'm having some trouble with actually creating the script pythonically (I ...
0
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1answer
172 views

Get OP_RETURN from bitcoin-cli

Is there a way to extract old OP_RETURN transactions from the commandline with bitcoin-cli or something? Something in the way of getAllOpRetFromBlock(345345) ...
2
votes
1answer
242 views

Can a transaction have a single 0-value OP_RETURN as its only output?

My goal is to create a transaction that spends dust outputs to a miner. Since the goal is to reduce the UTXO set by consuming low value outputs, I do not want to create any new UTXO by actually ...
0
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0answers
528 views

how to connecting to the correct RPC port?

When I use OP_Return, the following error occurs. It tells me - (make sure server is running and you are connecting to the correct RPC port). How to solve this problem? My bitcoin core is open
1
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1answer
473 views

creating OP_RETURN script on bitcoin core console. i.e. with the help of commands

I want to create a OP_RETURN script on bitcoin core console. Not using GUI, i.e. available on proofofexistence.com , Just as we create raw transaction and then sign it and then broadcast it, I am ...
0
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1answer
125 views

Is it feasible to store information in the Bitcoin system?

I see that some new services are based on the possibility of storing information in the bitcoin system. For example, you can use it to store an encrypted file with a blueprint of an invention. Is ...
0
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1answer
147 views

Thin Client and OP_RETURN

I'd like to better understand how a light client works. As far as I know, a light client stores locally only the block headers (80 bytes each) and it receives a new block header on average each 10 ...
4
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2answers
313 views

Colored coin adds meta data to OP_RETURN. Why isn't this frowned upon?

It seems that adding data to OP_RETURN is frowned upon and considered as bloating the blockchain. Blockchain.info wallet also had a short stint where users could include data into the OP_RETURN ...
1
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1answer
345 views

What is the 6a[…] hash in OP_RETURN transactions?

I've been looking up OP_RETURN transactions on http://coinsecrets.org/ and I noticed that they all contain hashes that start with 6a, for instance: ...
0
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1answer
757 views

Why OP_RETURN should be used instead of raw data?

I've read this great Explanation of what an OP_RETURN transaction looks like and now I have only one question. Imagine that someone want to store some data in Bitcoin's blockchain. Why should he use ...
3
votes
1answer
479 views

What was the very initial value of OP_RETURN?

My understanding is that OP_RETURN was first introduced in v0.9.0 (https://bitcoin.org/en/release/v0.9.0). This link (https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2014-November/006917.html)...
1
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1answer
88 views

OP_RETURN malleability?

Can anyone alter the data after OP_return? My question needs to have more characters, so I insert an example, that doesn't hurt: "vout" : [ { "value" : 0.00000000, "n" : 0, ...
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0answers
46 views

Is there a Bitcoin exchange which allows OP_RETURN outputs?

Bitcoin has the option of OP_RETURN which can be used to add an extra bit of information to transactions. This is visible when the transaction is decoded and one can check what data was added to the ...
3
votes
1answer
364 views

Do OP_RETURN messages persist on the blockchain?

I've been doing a lot of reading on OP_RETURN, and I want to understand something that still seems unclear. When we create a transaction with OP_RETURN (which I understand will not eternally pollute ...
3
votes
1answer
293 views

OP_RETURN marks transaction or output as invalid

I am currently looking into the Bitcoin script. I want to create a transaction with one output with OP_RETURN and some data, and one output which pays coins to some address. I am confused, does ...
1
vote
1answer
112 views

Do I need a full node to perform OP_RETURN transactions?

I want to build a services that allows people to perform OP_RETURN for proof of existence. Do I need to run a full node to do this (then e.g. using the OP_RETURN PHP scripts from https://github.com/...
0
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0answers
84 views

is it safe to reuse payee address for OP_RETURN payments

I understand there are privacy and security issues with reusing addresses, for example Is it safe to reuse a Bitcoin address? Do they also apply to OP_RETURN payments? I want to ledger IPFS file ...
1
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2answers
232 views

Is OP_RETURN combined with a hash, appropriate for proof of existence of an asset?

I want to store a hash (of a tweet) in a way that is : Censorship proof Public Unchangeable Persistent Non centralized Less expensive as possible, obviously free if possible Technology offered by ...
1
vote
1answer
156 views

Zero-BTC transaction fees, service-specific mining pools and external compensation

Bitcoin is a network that is proven to be stable, but if you want applications on top of Blockchains you have to play by the rules of the system. For notary use cases (for example), where you would ...
0
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1answer
74 views

error durring the bitcoincore installation

I want to use python-OP_RETURN library. For this I need to install bitcoin core. But when I exceute this command sudo apt-get update I have this error : Err http://ppa.launchpad.net jessie/main ...
1
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1answer
2k views

Install bitcoin core on debian jessie error

I have to install bitcoin core to use op_return library. But I have difficulties to install correctly bitcoin core. First I run the command sudo apt-add-repository ppa:bitcoin/bitcoin Second I ...
4
votes
1answer
105 views

Does any current SegWit or blocksize increase proposal also seek an increase in the OP_RETURN byte limit?

Does any current SegWit or blocksize increase proposal also seek an increase in the OP_RETURN byte limit? https://en.bitcoin.it/wiki/OP_RETURN Are there any current pull requests that seek an ...
1
vote
3answers
145 views

Accessing Testnet [duplicate]

Can i access the testnet without downloading the blockchain? im developing a software to do a testnet (later it will be in mainnet) transaction with a custom message embedded into OP_RETURN. if the ...
1
vote
1answer
316 views

OP_RETURN custom message in testnet transaction

I would like to do a bitcoin transaction in testnet by embedding a custom message in the OP_RETURN. do i have to download the bitcoin core client with and the block chain to do that? or can i use a ...
4
votes
1answer
413 views

Transaction with `OP_RETURN` to a particular address

How do I formulate a transaction with OP_RETURN to a particular address using the bitcoinj library? SendRequest req; Transaction transaction = new Transaction(Main.getNetWorkParameters()); ...
2
votes
1answer
136 views

Question regarding the number of bytes in an OP_RETURN transaction

I was reading this very useful explanation of what an OP_RETURN transaction looks like and got tripped up by part of it. "hex" : "6a13636861726c6579206c6f766573206865696469" This first ...
5
votes
1answer
2k views

Testnet: mandatory-script-verify-flag-failed when doing OP_RETURN

For some reason I keep getting error: {"code":-25,"message":"Missing inputs"} EDIT: Updating error now that the full testnet blockchain is downloaded "code":-26,"message":"16: mandatory-script-...
5
votes
3answers
624 views

What would happen if there are more blockchain imitators like Factom?

I was referring to this question. Apparently Factom creates its own "chain" for timestamping purposes, "hashes" the entries, and then stores these hashes on the blockchain, to create an unalterable ...
0
votes
1answer
141 views

How to read the asset quantity list of open asset protocol?

I'm studying open asset protocol, however I have no idea how to read asset quantity list. The Open Assets Protocol documentation tells that data in marker output 0xac 0x02 0x00 0xe5 0x8e 0x26 ...
3
votes
1answer
415 views

'The node is not in a connected state' error when trying to execute OP_RETURN transaction with NBitcoin

This is my first time trying out the NBitcoin library to create a transaction. I am trying to create an OP_RETURN transaction, but every time I try to execute the Version Handshake with the node I get ...
2
votes
2answers
299 views

Where is the code making OP_RETURN a standard transaction type?

I am looking through the bitcoin github history. I am trying to find the commit where OP_RETURN became accepted as a standard tx. This was included in the changelog for Bitcoin Core 0.90. Any help ...
4
votes
2answers
215 views

When can I send 80 byte OP_Returns?

I heard bitcoin-core 0.11 allows 80 byte OP_Returns, but I know miners operate different implementations and was wondering when it would be likely that 80 byte OP_Returns will be swiftly included in ...
1
vote
2answers
396 views

Broadcasting an OP_RETURN transaction

I am facing two problems below, First is that I am trying to broadcast transaction which have OP_RETURN but blockchain.info continuously rejecting it, though I have broadcast it using bitcoind. ...
3
votes
1answer
305 views

Does an OP_RETURN script always need another output within the transaction?

I was reading this: Explanation of what an OP_RETURN transaction looks like and I wondered if the second output "value" : 0.00200000, was at all necessary. Can I just have a OP_RETURN with a 0 output ...
1
vote
1answer
348 views

None Standard Script Output OP_RETURN

I'm trying to push 'hello world' in an op_return tx via blockchain.info and keep getting None Standard Script Output OP_RETURN 68656c6c6f20776f726c64. Here's my script 6a0b68656c6c6f20776f726c64 It ...
2
votes
1answer
246 views

Do transactions with null data take longer to confirm?

I was under the impression that null-data transactions were standard, but whenever I try to broadcast one it takes a while for it to appear in a block. I tested this by broadcasting 2 transactions ...
3
votes
1answer
594 views

Can I have multiple OP_RETURN outputs in one transaction?

I am wondering if I can inject multiple OP_RETURN outputs in one transaction?
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2answers
2k views

Alternatives to OP_RETURN to store data in Bitcoin blockchain

I am working on iOS camera app and would like to store hash of photos inside blockchain for the "proof of existence". AFAIK transaction with OP_RETURN in output has some disadvantages non-refundable....
2
votes
2answers
882 views

OP_RETURN using python

I'm trying to make a simple program that can reliably upload an OP_RETURN transaction. I have found some examples online, but so far they don't work consistently. The ones that go through seem to be ...
2
votes
1answer
306 views

Why am I unable to post two transactions (the second from the change address of the first) in the same block?

I'm attempting to make a transaction on the testnet with an OP_RETURN and a change address in it, and then make a second OP_RETURN transaction from first transaction's change address in the same ...