MultiChain Developer Q&A - Recent questions tagged smart-filters

Smart filters: initiate transaction on certain condition in stream

Sun, 16 Feb 2025 21:31:00 +0000

Hi,

I was playing around with the smart filter function and was wondering about this scanario:
Node 1 pulishes to a stream certain values, like energy meter data:
{
    "energy": 1000
}

is it possible to craft a filter whoch checks if the energy value is over a certain value and create a transaction from Node1 to Node2? Would it be a transaction or a stream filter, anyway?

something like
function filtertransaction()
{
    var item=getfilterstreamitem();

    var json=item.data.json;

    if (json.energy > 1000)
        // check if there are enough funds
        // if yes, create transaction
        return "Transaction from address XX to YY was successful";
}

Or do I have a complete misunderstanding here? Based on this question I am not completly sure: https://www.multichain.com/qa/26462/add-balance-to-a-especific-address-using-smart-filters

Thanks a lot in advance.

edit: the smart filter is working. I tested it with values smaller and bigger than 1000 and if smaller than 1000 adding an entry to the stream is refused. Now the question is, if I can craft a transaction for when the condition gets true?

smart filter and smart transaction tutorial

Sun, 28 Nov 2021 22:16:47 +0000

Hi,

I want to learn step by step how write and run smart filter and smart transaction.

Which language I wrote them? Where I wrote them? can i have online resources to learn step by step?

How can i apply smart filter to issuemore transaction?

Mon, 28 Jun 2021 13:37:52 +0000

Hello,
Can anyone explain me is it possible to apply smart filter to issuemore api calls, and if it possible how can i do this in practice? Thank you.

Can stream filters write something to the blockchain or modify the stream item?

Thu, 17 Jun 2021 10:23:31 +0000

Hello,

let's suppose I'm publishing some JSON to a MultiChain stream and I want to either

1) publish the object with some modifications (e.g., add\remove a key, edit a value, etc.)

2) publish (or not) the object as it is, but create\update a blockchain variable

Is this possible?

Thank you!

Add balance to a especific address using smart filters

Sat, 09 Jan 2021 07:08:41 +0000

Hello MC Team

I am developing a basic prototype that simulates a loan , there are 2 parties in this particular scenario , 1) the lender , 2) the borrower . Once a lender has given an ammount of assets (USD) to the borrower , the first one must receive an interest in a predefined basis, for instance 30 days since the funds was lended , any idea for solving this using smart filters? I was checking this case using a smart contract plattform , but I am still wondering if Multichain is able to do the same using filters or any piece of code.

Thanks in advance

David.

How to deploy Smart filter code to Multichain ?

Sun, 07 Jun 2020 19:06:38 +0000

Dear Team,I have read all documentation regarding smart filter. I have read all posts but i am still not able to deploy my code to multichain.

This is my code

function filterstreamitem() {

var item = getfilterstreamitem();

if (item.format != "json")

return "Only JSON items are allowed";

var json = item.data.json;

if ((!json.hasOwnProperty("PersonName")) || (json.PersonName.length < 2))

return "Item requires a PersonName";

if ((!json.hasOwnProperty("PersonCnic")) || (json.PersonCnic.length != 2))

return "Item requires a valid Person Cnic";

}

I have tried everything . i am on windows. My command is multichain-cli chain1 create streamfilter filter1 "{}" 'code' . I have tried one line with single quotes but my code is not being deployed. Each time getting errors. here is my stream data.

"data" : {
"json" : {
"_id" : "5ec77c6308108850902511f2",
"PersonName" : "Testing prototype",
"PersonCnic" : "3310062212345",
"Hash" : "fe540724937edbcbd170d39d7a6ee70e9d429f2d"
}
},

Simple function. Please tell me exact how to run filter

How to access JavaScript Class "Date" in a Stream Filter?

Thu, 30 Apr 2020 14:40:41 +0000

I would like to check if some value can be parsed to a date, which should be easy with JavaScript's function Date.parse() but I get an error saying: TypeError: Date.parse is not a function

Is it possible that Multichain restricts the use of the Date class? I know that Date.now() is restricted but is Date.parse() as well?

liststreamkeys in filtercode.

Thu, 16 Apr 2020 02:04:49 +0000

I'm trying to implement my own filter code. In which I want to use liststreamkeyitems as function. since it needs two parameters stringName and keyName. So I tried using it as, liststreamkeyitems("stream1","key1"). Key1 is the key preset in stream1. So while executing this command, it is showing me error as lisstreamkeyitems is undefined. So to know the details of error I tried using teststreamfilters but there also I'm getting some syntacterror .

So I would like to request you if you could take any demo example and show me how to use teststreamfilters command and please also let me know the way I'm using liststreamkeyitems("stream1","key1"), is right or not?

Testfilterstream executed command:

teststreamfilter "function filterstreamitem(){ var item= getfilterstreamitem(); if(item.keys.length<2) return 'At least two keys required';}" "3e0849da9671563be8d71fccf5f33b1c9aeacd681a354fc98350c874e867136c"

O/P error:

Error parsing JSON:function filterstreamitem(){ var item= getfilterstreamitem(); if(item.keys.length<2) return 'At least two keys required';}

Since I was getting above error I tried using runstreamfilter,

runstreamfilter df1 "3e0849da9671563be8d71fccf5f33b1c9aeacd681a354fc98350c874e867136c"

But the output i got is,

Stream input is not found in this transaction

Why I'm getting above error is it bcz i have not passed vout in above line but how can i even pass vout i have not created transaction i have created stream1, which is already created and all i have is its transaction id. In stream how can we get vout?

Check the df1 code:

function filterstreamitem() { var item = getfilterstreamitem(); var keyinfo=liststreamkeyitems(item,"key1");var data=keyinfo.data;if(data>50) return "successful";else return "unsuccessful";}

did I use liststreamkeyitems function properly??

how to upgrade stream filters code? And how to delete existing filter?

Wed, 15 Apr 2020 14:04:29 +0000

how to update filters code which is already created and s there any way to delete the filter?

Please Provide Example of 4 steps of "To use an approval" of transaction-filter github code: To use an approval"

Sat, 21 Mar 2020 10:30:32 +0000

Sir the ways you mentioned are not helpful

Referer this code:

https://github.com/MultiChain/smart-filter-examples/blob/master/transaction-filters/approve-asset-transfer.js

Here they have mentioned steps "to use an approval" in which the commands which are mentioned are:

createrawsendfrom and appendrawtransaction, there is no syntax given in any links provided by multichain and the links which you have mentioned in my previous question.

You may say the other commands are similar so I should refer that, so I would like to tell you that I have already referred and tried executing that and accordingly I also tried above commands but I'm facing syntax issue that is why I wanted proper guidance. If you could provide me that 4 steps example with syntax then I would really appreciate it.

Github transaction filter example: Approve Asset Transfer, I'm not able to understand this code?

Sun, 15 Mar 2020 10:16:57 +0000

Code link: https://github.com/MultiChain/smart-filter-examples/blob/master/transaction-filters/approve-asset-transfer.js

Error:

Filter code blocked this transaction with the reason: (time taken 0.001472 seconds)
Address 1KB85GgVgHyters6tMMeQ7DYS9fkY192yq8ey1V did not include sufficient USD spending approvals in this transaction false undefined

I'm trying to understand GitHub transaction filter example- approve asset transfer.

If I have understood it correctly, that code is processing an only pre-approved transaction. pre-approved transactions are those whom approvals are given by the address with low-1 permissions. And that approvals are provided by the command:

sendfrom <approver-address> <approvee-address> {"data":{"json":{"type":"approval","maxraw":<rawqty>,"expiry":<expiry>}}}

So I gave approvals using the above command and I set max raw quantity and expiry as last block time. And then I tried to run this code. But still, I'm getting the above error. To identify that my approval is set properly, I'm checking variable like

for (var inputnum=0; inputnum<tx.vin.length; inputnum++) {

var spentoutput=getfiltertxinput(inputnum);

if (

outputisapproval(spentoutput) &&

(spentoutput.scriptPubKey.addresses[0]==address)&&

(spentoutput.data[0].json.expiry >= getlastblockinfo().time)

) {

requiredraw-=spentoutput.data[0].json.maxraw; /* we can use this approval */

}

if (requiredraw>0)

return "Address "+address+" did not include sufficient USD spending approvals in this transaction "+hasapproval+" "+spentoutput.data;

}

why spentoutput.data is returned as undefined even when I have given approvals:

command:

sendfrom 1KB85GgVgHyters6tMMeQ7DYS9fkY192yq8ey1V 192ruBtNjWSXUQi2xpWmka5M14rUbNNxzxTbcb '{"data":{"json":{"type":"approval","maxraw":10000000,"expiry":1584258634}}}'

Please resolve my doubt asap.

But Where should i enter my code?

Mon, 27 Jan 2020 01:45:23 +0000

I have read document's smart filters part but i actually wanted each and every step to run my code. Like how should i add my code in command line. There it's written that java-script engine is already embedded. But in which location i have to add java-script code? How should i check that it is working properly? All these things i wanted to know. Can anyone please guide me? And also i want to know more about smart filters. So is there any article or research paper which can be helpful to me to know smart-filters in detail?

multiple stream filters question

Wed, 22 Jan 2020 09:47:54 +0000

Hi guys,

If I have multiple stream filters activated on a stream which validate different item data, is there a fixed order in which the streams checks will be performed?

e.g. filter 1 checks:

var oItem = getfilterstreamitem();
    if (!oItem && !oItem.myData) {
        return 'no valid stream item';
    }

filter 2 wants to check deeper item properties e.g.

var oItem = getfilterstreamitem();
    if (!oItem.myData.myProperty) {
        return 'no valid stream item';
    }

filter 2 relies on filter 1. So I want filter 1 to be performed first and then filter2. Because if filter 2 is performed first and there is no oItem.myData it will crash with a JS error. To prevent this I have to copy the code from filter 1 also to filter2 which I don't want as that would mean that every filter has to have the same "precondition filter code"

Or do I have to deactivate filter 1 first and then copy filter 1 code to filter 2 and activate only one "big" filter?

Another question: what is with performance of many small filters vs one big filter? What is better?

Extending Smart Filters

Tue, 26 Nov 2019 21:46:21 +0000

HI

We are looking at enforcing rules regarding asset issuances and transfers directly on the MultiChain nodes to remove the need for participants to use our own services for this purpose.

To do this we really need a way to publish and store rule metadata on the chain that could then be accessed by a smart filter and applied to transactions. We had thought we could use a stream to mange this metadata.

Browsing the documentation, I don't think we can do this. It looks like the only place we could store metadata that we could retrieve from within the filter would be to inject it into the initial asset issuance which for asset rules should be OK bar we could never change it, but ideally we would want to be able to manage the meta-data in such a way we could update it over time.

In addition, is there any way to find the chain burn address from within the filter?

Marty

Guidance to create smart filters on cold

Mon, 11 Nov 2019 13:55:47 +0000

We are properly protecting admin key, cold signing permission management. But now are needing to create filters that have to be done by admin addresses. Can you please provide steps to do that using the cold node?

Thanks in Advance.

Can coinbase transactions be filtered?

Sat, 31 Aug 2019 01:26:00 +0000

I'm trying to set up some mining addresses but not rewardable.

I've read filters can not be applied to the output of coinbase transactions.

Is there any way to reject such transactions or redirect native currency output to another ( i.e. burn ) address?

Regards!

Writing streanm filter with specific function

Wed, 03 Jul 2019 21:23:38 +0000

Hi,

I am looking to create a smart filter that makes sure if you post an item with key value x that the last item on the stream had key value y in order to post it. Is there a way to perform this check? I couldn't follow the API very well to know if there was a good way to make sure. Thanks

Multichain Enteprise: Selective Stream Indexing

Sat, 29 Jun 2019 21:43:00 +0000

A while back ago I asked a question on how could I retrieve information about a previous stream's item from inside a stream filter and it wasn't possible as we couldn't know if nodes were indexing that.

Would this command for Enterprise Solution work solving the issue?

Un-related but, how is the pricing option for the Enterprise Software? ( We would run it ourselves)

Create SmartFilters from file due to ARG_MAX

Thu, 23 May 2019 01:24:53 +0000

So,

I need to create a Transaction Filter which is enormous () due to a few JSON's. There's simply no way to insert that on the terminal due to "getconf ARG_MAX" (the max size of a terminal command) generally being ~250k bytes.

Already tried to put everything on the same line without spaces, but I'm way pass that.

Can you help me in any way?

getting data from streams

Fri, 17 May 2019 10:30:00 +0000

Hello Multichain,

I have created a stream called users, where each address of the user is stored along with the username. I could get the entire array of objects and check for a purticular user. But I needed a more effecient method

Is there a way by using say Smartfilters we can pass metadata value and get the object out ?

Please let me know

Thanks

Stream Smart Filter: Get Transaction Information through TxID

Tue, 26 Mar 2019 20:30:23 +0000

While I was developing a Smart Filter I encountered a situation where the streamItem.keys[0] was a transactionID and I had to get information about that transactionID.

Basically, I needed a function

getTransaction :: TxID -> { TransationInfo }

where I could pass a transaction ID and receive more information about that transaction.

Use-Case: The user is posting some data into the stream, referring (through a txID in the key), that this new data is supposed to replace an older item with said ID, and I need to make sure that this old ID exists (and a few other properties as well).

How create a filter who forbiden transaction if the adress reach max asset unit ?

Mon, 04 Mar 2019 08:56:58 +0000

Hi !
Is it possible to put a limit on the maximum number of asset that an address can have?
For example I have a total of 20 PCs and I want each node to have only 5 maximum at the same time.
Is it possible to make this limitation with smart filter?

Stream filter to check the keys

Thu, 21 Feb 2019 20:20:07 +0000

Hi,

I want to use stream filter to validate my input key and reject incase it fails.

My key should be in format 111-22-3. Any other key like 11111-22222-333 should fail.

Below is the snippet to create a filter to check and match above regex for key.

create streamfilter testfilter '{}' 'function filterstreamitem() { var item=getfilterstreamitem(); if (item.keys.length<8) { key = item.keys.data; var ncheck= "[0-9]{3}[-][0-9]{2}[-][0-9]{1}"; var ncheck1= new RegExp(ncheck); return ncheck1.test(key)} }'

I am able to create the filter successfully and approved by admin, but still the wrong keys are passing the stream.

Is there anything i am missing?

I think this will be an interesting feature and will be helpful..! Expecting MC to grow more and more with new features everyday :)

Disable or deleting a smart filter

Thu, 21 Feb 2019 20:09:22 +0000

Hi,

Is there a way to disable or delete the tx and stream filters.

I am testing filters and any modification inside the function, i have to again create a new filter.

Thanks.

Stream Smart Filter: Is the file still kept in storage if invalid?

Mon, 18 Feb 2019 21:04:07 +0000

A stream filter is only applied by nodes subscribed to a stream, and so is more efficient, but cannot prevent malicious nodes from publishing invalid data (which will subsequently be ignored by stream subscribers). Note also that transaction filters cannot perform validation of off-chain data, since that data does not appear inside the transaction itself, whereas stream filters can validate both on-chain or off-chain data.

Am I right to assume that "ignored by stream subscribers" means that files deemed invalid by stream rules would be deleted upon arrival by the nodes?

What is the use of smart filters in multichain?

Thu, 07 Feb 2019 05:24:32 +0000

Stream-filters to all streams

Tue, 05 Feb 2019 12:52:01 +0000

Hello,

Is it possible to apply a stream filters to all streams of a blockchain?

Many thanks in advance.

Creating new transaction filter

Tue, 05 Feb 2019 08:59:00 +0000

Hello Devs,

I am deploying new transaction filter in netwok but it's throwing me parsing error and not getting deployed on chain can any body suggest me what to do now?

create txfilter filter4 "{}" "function filtertransaction()

{

var addressbalancechange=getfilterassetbalances("USD", true);

for (var address in addressbalancechange)

if (addressbalancechange[address]>1000)

return "Address "+address+" is receiving too much USD";

}"

How to use Stream filters ?

Wed, 16 Jan 2019 09:51:17 +0000

Hello Guys ,

I am learning stream filter in multichain so i am just going through it and now i just reach to this points :

Smart Filter Tutorial

Below is an example set of multichain-cli commands that demonstrate the creation and application of a transaction filter and a smart filter.

First, run listpermissions admin and copy and paste the displayed address here:

Now create a transaction filter that prevents new streams being created:

create txfilter filter1 '{}' 'function filtertransaction() { var tx=getfiltertransaction(); if (tx.create) return "Stream creation temporarily disabled"; }'

See the filter listed, retrieve its code and approve it:

listtxfilters
getfiltercode filter1
approvefrom 1Xs5ZRKETcsATQp4AgZPodfco14Amcx4FvYoc1 filter1 true

1)The point which i have highlighted for that i am having already running chain is running on my node But the point is i was not able to figure out how can i achieve this smart filters concept in cli interactive mode?
Or how can i embedded smartfilter code in existing multichain network?? how that embedded code can be used by everynode for validation?
2)In custom permissions what do you mean by high1,high2 and low1 , low 2 permission means?

Fee and Smart Filters

Mon, 31 Dec 2018 11:09:19 +0000

Can I set a minimum fee per smartfilter? so that it is customizable?

can a filters reference other transactions?

Thu, 20 Dec 2018 14:05:05 +0000

Hi Multichain folks,

I wondering if filters can reference transactions other than the transaction being filtered or stream items other than the stream items being filtered?

For example, I'd like to implement a stream item filter that would prevent a publisher writing to a stream key that had already been written to by another publisher. The idea is to use streams as key value stores, where the first publisher to a key "owns" it and then is the only one that can publish to it.

Custom filter permissions examples

Thu, 20 Dec 2018 08:07:59 +0000

Hello! Congratulation on the beta release! Keep up the good work!

While reading the change notes, I've noticed that you added a support for custom filters. However, when I tried to look for examples for it in the docs (including the smart filter docs and the git repo) I couldn't find any code samples.

Can you please show or provide some?

Thanks again

charging more than native currency for stream creation

Tue, 18 Dec 2018 09:04:33 +0000

I have created a chain for Non Fungible Token usage...with native currency applied...to transfer currency is 1 unit, but I wanted to charge more in chain for creation of a stream and a stream item with in it. Possible via smart filters?

Possible via smart filters to give permissions to mine based on native currency balance?

Tue, 18 Dec 2018 09:01:10 +0000

If user holds X amount of native currency, mining permissions is given, otherwise mining permissions is revoked automatically...I can do this manually, but thinking it could be made automatic via smart filters?...

pay out automatically using smart filters

Sat, 15 Dec 2018 09:15:53 +0000

Can i create a smart filter that will pay out automatically an asset from the results of another asset transaction, based on logic rules i specify in the smart filter?

Is there a ‘smart filters execution order’?

Sat, 08 Dec 2018 09:01:25 +0000

Hello,

suppose we have a blockchain running and n active smart filters. In which order are they executed (if any) when a tx is sent to the blockchain?

Thank you very much.

Will there be other languages for smart filters?

Sat, 01 Dec 2018 09:08:18 +0000

Hello,

Will there be other languages for smart filters? I’m thinking about Python3 (or even MicroPython).

Thanks for your answer.

Smart filters in JavaScript project

Mon, 26 Nov 2018 12:30:04 +0000

Are there any third libraries for smart filter implementation and callbacks, like there is MultiChain-Node for MultiChain JSON-RPC API? Or is there some other way to include smart filters in JavaScript project?

Is it possible to read stream_x content from a smart filter?

Tue, 06 Nov 2018 00:50:40 +0000

Hello,

Is it possible to read stream_x content from a smart filter?

The use case is the following:

I want to accept\reject a transaction (using an appropriate smart filter) of some asset depending on what a user has published on stream_x.

Thanks.

Is it possible to allow exchange-only transactions on some kind of asset?

Sat, 27 Oct 2018 17:14:33 +0000

Hello,

is it possible to allow exchange-only transactions on some kind of asset?

Consider this scenario: there are many assets, let's say asset_1, asset_2, ..., asset_n and there are also some special ones: special1, special2. I need to allow transactions which involve asset_i only if they are exchange transactions.

So:

A sends B asset_i: rejected
A sends B asset_i and B sends A special1 (or special2): approved
A sends B special1 (or special2): approved
A sends B special1 (or special2) and B sends A special1 (or special2): approved

I know I should use smart filters but I don't know where to begin.

Thank you very much.

reject transaction filter working before approvefrom is executed

Mon, 22 Oct 2018 04:32:47 +0000

I tried to deploy the reject-all-transactions.js given in the code examples. The filter was compiled and then when I tried to run the approvefrom true for the filter it just doesn't allow it. The filter is working already for the approvefrom command only. It doesn't apply to other transactions. Attaching my code execution below.

testingsmartfilters: getfiltercode rejectfilter
{"method":"getfiltercode","params":["rejectfilter"],"id":"31237136-1540182035","chain_name":"testingsmartfilters"}

function filtertransaction() { return 'All transactions rejected' }
testingsmartfilters: listtxfilters
{"method":"listtxfilters","params":[],"id":"62675408-1540182044","chain_name":"testingsmartfilters"}

[
{
"name" : "firstfilter",
"createtxid" : "a72e6bcb8e49cc07c81b694d22d85ffb4be591d27b09ae6581fb9eea18626718",
"filterref" : "47-265-11943",
"language" : "javascript",
"codelength" : 139,
"for" : [
],
"compiled" : true,
"approved" : true
},
{
"name" : "rejectfilter",
"createtxid" : "2aed8e513fc295af15010bd39409f26a7033017dfad98c5b53c4dc051959ba6d",
"filterref" : "71-265-60714",
"language" : "javascript",
"codelength" : 67,
"for" : [
],
"compiled" : true,
"approved" : false
}
]
testingsmartfilters: approvefrom 1KHCUryUcu8MBcvwiF5zgxePbVfm18JJv4 rejectfilter false
{"method":"approvefrom","params":["1KHCUryUcu8MBcvwiF5zgxePbVfm18JJv4","rejectfilter",false],"id":"84112443-1540182070","chain_name":"testingsmartfilters"}

2e28c4b7d7d823d169183ca02194ebdab2c06b186004094436ef6680c4d3fa4d
testingsmartfilters: approvefrom 1KHCUryUcu8MBcvwiF5zgxePbVfm18JJv4 rejectfilter true
{"method":"approvefrom","params":["1KHCUryUcu8MBcvwiF5zgxePbVfm18JJv4","rejectfilter",true],"id":"47671806-1540182074","chain_name":"testingsmartfilters"}

error code: -26
error message:
Error: The transaction was rejected: 64: The transaction did not pass filter rejectfilter (txid 2aed8e513fc295af15010bd39409f26a7033017dfad98c5b53c4dc051959ba6d): All transactions rejected
testingsmartfilters:

Issues when applying tx filters

Mon, 15 Oct 2018 12:42:39 +0000

Hi team (possible this is a duplication, as previous one I asked w/o being a member, sr for any inconvenience),

I've been trying to test the latest tx filters by using this script to limit asset for USD, but I had some issues, as below:

The filter actually filtered out the tx in the strange behaviour, as given, if value > 1000 it will be error, but even when I put 100 or 500, it also rejected the tx
When I approved the tx filters, the blockchain stopped producing new blocks (check with block height), all attempts to start again the chain are not successful

Here are the commands I've used:

multichain-cli test1 issuefrom 1Cr6VxbSQ5TMfegbUSgY4t1F2ing2QH2yVLgAd 1Cr6VxbSQ5TMfegbUSgY4t1F2ing2QH2yVLgAd '{"name":"USD","open":true}' 50000 0.01 0 '{"origin":"us", "stage":"01", "purpose":"parts prepayment"}'

multichain-cli test1 sendasset 1bND5DeePFNmrWBoeaVn4z6WJiYSQv9jMwSwY7 USD 3000

multichain-cli test1 create txfilter testfilter '{"for":"USD"}' 'function outputtoaddressbalancechange(output, spent, addressbalancechange) { if (output.assets) { for (var assetnum=0; assetnum<output.assets.length; assetnum++) { if (output.assets[assetnum].name=="USD") { for (var addressnum=0; addressnum<output.scriptPubKey.addresses.length; addressnum++) { var address=output.scriptPubKey.addresses[addressnum]; if (!addressbalancechange.hasOwnProperty(address)) addressbalancechange[address]=0; var rawchange=spent ? -output.assets[assetnum].raw : output.assets[assetnum].raw; addressbalancechange[address]+=rawchange; } } } } } function filtertransaction() { var tx=getfiltertransaction(); var addressbalancechange={}; for (var inputnum=0; inputnum<tx.vin.length; inputnum++) { outputtoaddressbalancechange(getfiltertxinput(inputnum), true, addressbalancechange); } for (var outputnum=0; outputnum<tx.vout.length; outputnum++) { outputtoaddressbalancechange(tx.vout[outputnum], false, addressbalancechange); } for (var address in addressbalancechange) if (addressbalancechange[address]>1000) return "Address "+address+" is receiving too much USD"; }'

multichain-cli test1 approvefrom 1bND5DeePFNmrWBoeaVn4z6WJiYSQv9jMwSwY7 testfilter true

Do you have any reasons for the strange behavior from the chain?

Thank you for your support,

Best,

created smartfilters not appearing on listtxfilters

Thu, 11 Oct 2018 08:14:14 +0000

ubuntu@ip-172-31-8-93:~$ multichain-cli testchain6 testtxfilter {} "function filtertransaction(){ var tx=getfiltertransaction(); if(tx.vout.length <2){ return 'test'; } }"

{"method":"testtxfilter","params":[{},"function filtertransaction(){ var tx=getfiltertransaction(); if(tx.vout.length <2){ return 'test'; } }"],"id":"32074384-1539245378","chain_name":"testchain6"}

{

    "compiled" : true,

    "reason" : null

}

ubuntu@ip-172-31-8-93:~$ multichain-cli testchain6 create txfilter jeshoanotherfilter {} "function filtertransaction(){ var tx=getfiltertransaction(); if(tx.vout.length <2){ return 'test'; } }"

{"method":"create","params":["txfilter","jeshoanotherfilter",{},"function filtertransaction(){ var tx=getfiltertransaction(); if(tx.vout.length <2){ return 'test'; } }"],"id":"89779756-1539245385","chain_name":"testchain6"}

5778193408cb49a8cb4668c3ab8012a19501c342c5b51b52d05535fa87f88dd1

ubuntu@ip-172-31-8-93:~$ multichain-cli testchain6 listtxfilters

{"method":"listtxfilters","params":[],"id":"88301285-1539245388","chain_name":"testchain6"}

[

    {

        "name" : "jeshosfilter",

        "createtxid" : "ff8a0c7d55d09f3d96fb60ab1d9f74cb09f652b7fae86155f755b5fbd3314e15",

        "filterref" : "63-266-35583",

        "language" : "javascript",

        "codelength" : 100,

        "for" : [

        ],

        "compiled" : true,

        "approved" : true

    }

]

Smart Filters and JSON-RPC APIs

Tue, 09 Oct 2018 17:53:33 +0000

Is it possible to use in Smart Filters the standard Multichain APIs, other than those explicitly listed in the page "Working with Smart Filters" (getassetinfo, getblockinfo,...)?

Thanks.

So... Smart Filters!

Thu, 13 Sep 2018 22:25:13 +0000

Once a smart filter (transaction-filter) is approved, is it applied to all transactions on that blockchain from that block onwards?

Please define a callback in layman's terms.

Can one smart filter reference another?

Thanks