What does "vout" : -1 mean in preparelockunspent output?

Question

Hello,

what does "vout" : -1 mean in preparelockunspent output?
I keep getting alternately -1 and 0 and I don’t understand why.

The method I used is the following:

preparelockunspent '{"asset1":1}'

I have got more than 300 units of asset1.

Thank you very much.

 

Answer 1

This certainly looks like a bug. Please provide a full transcript of the API request and its response, and let us know what version of MultiChain you are using.

Comments

I was experimenting a little bit, so there were many things going on the blockchain (smart filters, etc). On a fresh chain, I could not replicate the issue. If it happens again, I'll try to post an update.

In any case, I was using Multichain 2.0 alpha 6.

Thanks.

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OK, please keep us updated.

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Hello,
I managed to reproduce the issue on a fresh blockchain.
Let's get started:
1. create a new blockchain and get a cli:
multichain-util create chain1
multichaind chain1 -daemon
multichain-cli chain1

2. run following api calls:
2018-11-12 14:54:13.068    listaddresses
2018-11-12 14:54:37.827    issue 1NyMSJaUECZWg143a7V8dixAJG6csqnLq3P1Zz '{"name":"asset1", "open":true}' 1000 1 0
2018-11-12 14:56:21.343    create txfilter f1 {} 'function filtertransaction(){var b=getfiltertransaction();var e={};for(var c=0;c<b.vin.length;c++){outputtoaddressbalancechange(getfiltertxinput(c),true,e)}for(var d=0;d<b.vout.length;d++){outputtoaddressbalancechange(b.vout[d],false,e)}for(var a in e){if(e[a]>1000){return"Address "+a+" is receiving too much USD"}}}function outputtoaddressbalancechange(c,g,f){if(c&&c.assets){for(var e=0;e<c.assets.length;e++){if(c.assets[e].name=="USD"){for(var d=0;d<c.scriptPubKey.addresses.length;d++){var b=c.scriptPubKey.addresses[d];if(!f.hasOwnProperty(b)){f[b]=0}var a=g?-c.assets[e].raw:c.assets[e].raw;f[b]+=a}}}}};'
2018-11-12 14:56:24.939    listtxfilters
2018-11-12 14:56:32.618    approvefrom 1NyMSJaUECZWg143a7V8dixAJG6csqnLq3P1Zz f1
2018-11-12 14:56:37.325    approvefrom 1NyMSJaUECZWg143a7V8dixAJG6csqnLq3P1Zz f1 true
2018-11-12 14:56:39.148    listtxfilters
2018-11-12 14:56:48.875    getnewaddress
2018-11-12 14:56:59.892    sendasset asset1 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz 1
2018-11-12 14:57:06.904    sendasset 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz asset1 1
2018-11-12 14:57:10.523    grant 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz receive
2018-11-12 14:57:11.642    sendasset 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz asset1 1
2018-11-12 14:57:25.327    issue 1NyMSJaUECZWg143a7V8dixAJG6csqnLq3P1Zz '{"name":"USD", "open":true}' 1000 1 0
2018-11-12 14:57:29.013    issue 1NyMSJaUECZWg143a7V8dixAJG6csqnLq3P1Zz '{"name":"USD", "open":true}' 1001 1 0
2018-11-12 14:58:25.881    issuremore 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz USD 10000
2018-11-12 14:58:29.996    issueremore 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz USD 10000
2018-11-12 14:58:34.419    issuemore 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz USD 10000
2018-11-12 14:58:40.778    issuemore 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz USD 999
2018-11-12 14:58:43.378    issuemore 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz USD 1000
2018-11-12 14:58:44.671    issuemore 1BzCS2u4W8wamuDKmRK5dGiTaU5586iG3gxUvz USD 1001
2018-11-12 14:59:04.028    preparelockunspent '{"USD":1"}'
2018-11-12 14:59:05.728    preparelockunspent '{"USD":1}'
2018-11-12 14:59:10.002    preparelockunspent '{"USD":1}'
2018-11-12 15:05:49.825    preparelockunspent '{"USD":1}'
2018-11-12 15:05:50.540    preparelockunspent '{"USD":1}'
2018-11-12 15:05:51.084    preparelockunspent '{"USD":1}'
2018-11-12 15:05:51.586    preparelockunspent '{"USD":1}'
2018-11-12 15:05:52.043    preparelockunspent '{"USD":1}'


Those last preparelockunspent give me alternately -1 and 0.
I left wrongly typed commands on purpose in the unlikely event that they have something to do with this behavior.

I hope this can help and that it does not depend on something wrong I am doing.
The smart filter used is this one: https://github.com/MultiChain/smart-filter-examples/blob/b3387f760f4cabab6a1da73fe2a8b709663efe37/transaction-filters/limit-asset-transfer.js

Thanks.

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Thanks, I could reproduce it. We'll look into this for the next 2.0 release.