Sending multiple outputs in a single transaction results in 'transaction too large for fee policy'

[gituser]

Hi.

I'm using fundrawtransaction() to collect inputs for sending out and it seems to not work properly, I'm getting:

fundrawtransaction returned: array ( 'code' => -32603, 'message' => 'Transaction too large for fee policy', ),

Litecoin version is v0.13.2.1.

I'm testing on the testnet network.

$ ./litecoin-cli getinfo
{
  "version": 130200,
  "protocolversion": 70015,
  "walletversion": 60000,
  "balance": 16.45803239,
  "blocks": 1029556,
  "timeoffset": 0,
  "connections": 8,
  "proxy": "",
  "difficulty": 0.0002441371325370145,
  "testnet": true,
  "keypoololdest": 1492486802,
  "keypoolsize": 100,
  "paytxfee": 0.00010000,
  "relayfee": 0.00100000,
  "errors": ""
}

What could be the issue here?

Thanks.

[gituser]

OK, so the question is why feeRate should be set to 0.001 LTC and can't be 0.0001 LTC (which is the default value) for fundrawtransaction()

Here is what I'm doing:

$ ./litecoin-cli createrawtransaction "[]" "{\"mkEuBC3Eazz9FNBggDUb1hHmWCs6nZT3kv\":\"0.09008182\",\"n19qgZuxmmpTejJcmdov5CSaoWjuRc5pMR\":\"0.09008182\",\"mn1TW9Qzgb4UEVZjpG51UC3KjohVWbZzFw\":\"0.09008182\",\"mtXhUtM79CLqKxXtUnAxmKkPcBMJWAXtNE\":\"0.09008182\",\"mu4ka4dKBA4yWXDtVCENbLmQKxbHTAJTzu\":\"0.09008182\",\"mjceCPXqP6LQMvot3upiE7FvX7ajby88C7\":\"0.09008182\",\"miZPoRg8w2BGxRtcpfaYULsJReaMLArr51\":\"0.09008182\",\"n1MGAB4jTrGzZDsq5iaMnCfq2D6dae3PLZ\":\"0.09008182\",\"n35wyTYZTn1YXh9bYpHbJ8gL2FrFfuvKT2\":\"0.09008182\",\"mrhgKEzef2iJHBSUsstpo5zAev3b26rUAA\":\"0.09008146\",\"mu3oets6nzXBcb1Ma7SPiCxV67W8Zsmopg\":\"0.09008146\",\"mkPcw4jWhPeVFjNYAeF6Wqxh7RyT65CcoP\":\"0.09008146\",\"mj9ntDNp5NofdzHFGHL6RFuuTVC43oC1SC\":\"0.09008146\",\"msueoXhZN6hn3CHWfjLNM1PfeKfLFfScDX\":\"0.09008146\"}"
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

$ ./litecoin-cli fundrawtransaction "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" "{\"changeAddress\":\"mvMqabxd8eq3hZBem9oy8E29sk6HQSZaRZ\",\"feeRate\":0.0001}"
error code: -32603
error message:
Transaction too large for fee policy

$ ./litecoin-cli fundrawtransaction "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" "{\"changeAddress\":\"mvMqabxd8eq3hZBem9oy8E29sk6HQSZaRZ\",\"feeRate\":0.0009}"
error code: -32603
error message:
Transaction too large for fee policy

$ ./litecoin-cli fundrawtransaction "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" "{\"changeAddress\":\"mvMqabxd8eq3hZBem9oy8E29sk6HQSZaRZ\",\"feeRate\":0.001}"
{
  "hex": "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",
  "changepos": 11,
  "fee": 0.00066800
}

If I omit feeRate it gives the same estimate fee "fee": 0.00066800 as for feeRate: 0.001.

Is there any explanation about this behavior ?

EDIT: in bitcoin it works just fine if I specify feeRate: 0.0001, so it has to be something to do with litecoin.

For now, as a workaround, I'm just omitting feeRate in fundrawtransaction() completely..

Thank you.

[Someguy123]

The fee in LTC is 0.001 LTC per kb, it's mandatory. You can't lower that fee on LTC, and there are special rules for dust (outputs under 0.001 LTC) which cause penalty TX fees (addt. 0.001 LTC per 0.001< output).

[gituser]

@Someguy123, how can you explain then that the resulting fee is 0.00066800 LTC per 1024bytes transaction? Which is less than 0.001 LTC...

[face]

I think 0.00066800 is the fee for the entire transaction, not per 1024 bytes. So, if the entire transaction is < 1024 bytes, than a fraction of the .001 fee per 1024 bytes make sense. I tried to find your transaction in a testnet block explorer, but couldn't find it to verify the complete transaction size.

[gituser]

@face, sure it is.

It's just confusing what feeRate actually means?

[face]

feeRate = fee per 1024 bytes. You ask how the "fee" it can be less than .001 and that confuses you. That is because it is the "fee" that is .000668, not the "feeRate".

I think it will make more sense to you if you compare it to a rate in a grocery store. So instead of .001 per 1024 bytes, say it was $1 per kilogram of rice. If you then bought half a kilogram of rice, the final fee would be $0.50. That is how a rate of $1 produces a fee of $0.50. The same thing with Litecoin. If you pay a rate of .001 per 1024bytes for 512 bytes, your fee would be .0005, which is less than the feeRate of .001.

[gituser]

@face

feeRate = fee per 1024 bytes. You ask how the "fee" it can be less than .001 and that confuses you. That is because it is the "fee" that is .000668, not the "feeRate".

Here you go, the test transaction: https://chain.so/tx/LTCTEST/1229e0f7be81971e9618b6ba66165d7f8b2dcf94fb1c48da31e579e072ad311e

It's 1212 bytes, final fee is 0.00121200 LTC

So fee per KB should be: 0,001024 LTC or so, right? Are you sure, btw, KB is 1024 bytes and not 1000 bytes?

But in fact I can't set feeRate to anything less than 0.001 LTC which seems very odd to me.

It seems the fee per KB was in fact used little over then 0.001 LTC, when in fact default is 0.0001 LTC

[face]

Yes. But what is odd about a hard coded consensus rule to prevent spamming with dust? As @Someguy123 stated: "The fee in LTC is 0.001 LTC per kb, it's mandatory"

[gituser]

@face sorry i didn't know that multi output transaction requires 0.001 LTC per kb.
is there anything about his in the docs or somewhere? or it's just hardcoded in the code?

[face]

Yes, it is documented as mintxfee. And it applies to single output transactions too. It applies to all transactions: https://litecoin.info/Transaction_fees

[gituser]

ok, @face, I'm closing this issue then.

would be nice tho for developers force this fee policy as well for settxfee aka paytxfee.