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Author Topic: Send full amount as a fee to miners  (Read 2173 times)
tspacepilot
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September 01, 2015, 07:56:47 PM
 #21

So the one output would have a value of 0 Satoshis and the script part would just be OP_RETURN + 40 bytes of data?
If this is the preferred dust cleanup transaction I'm happy to know it.
Yes. You are not forced to add 40 bytes of data.
The one-byte-output-script OP_RETURN and zero amount to it will send all your inputs to miner
for example:
https://blockchain.info/tx/3d665c1eb25160444cf053988a0d7d0c3ec5e68e3897a917d59447052788cfc5
note, that blockchain.info can not decode this output script to address and shows message "Unable to decode output address - (Unspent)"

I do not know what client is able to create such transactions.
It is quite easy, but I use my own tools.

One follow-up, according to the OP codes listed here https://en.bitcoin.it/wiki/Script, it seems that OP_RETURN:

Quote
Marks transaction as invalid. A standard way of attaching extra data to transactions is to add a zero-value output with a scriptPubKey consisting of OP_RETURN followed by exactly one pushdata op. Such outputs are provably unspendable, reducing their cost to the network. Currently it is usually considered non-standard (though valid) for a transaction to have more than one OP_RETURN output or an OP_RETURN output with more than one pushdata op

This is a little confusing because "valid" seems to be being used more than one way in the same paragraph.  I guess this isn't the kind of marking invalid which would cause a node not to relay the transaction?  What's the correct understanding of "valid" here?

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September 01, 2015, 08:05:30 PM
 #22

What's the correct understanding of "valid" here?
Valid = the redeem transaction can be included in blockchain
But.
It is impossible to create such scriptSig, because OP_RETURN in scripPubkey will always fail the execution.
So, this is provable unspendable output.

https://en.bitcoin.it/wiki/Script#Provably_Unspendable.2FPrunable_Outputs
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September 01, 2015, 08:55:48 PM
 #23

What's the correct understanding of "valid" here?
Valid = the redeem transaction can be included in blockchain
But.
It is impossible to create such scriptSig, because OP_RETURN in scripPubkey will always fail the execution.
So, this is provable unspendable output.

https://en.bitcoin.it/wiki/Script#Provably_Unspendable.2FPrunable_Outputs

Got it.  And thanks for the pointer to the bottom of that page, I had overlooked that.  I think this also answers OP's question pretty definitively.

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