MultiChain Developer Q&A - Recent questions tagged transactions

Get Asset Transaction Total Count

Thu, 06 Nov 2025 18:19:14 +0000

is it possible to get the total transaction of a specific asset? just the count just like what you did on explorerlistassetaddresses? you just add a parameter of '-' to get the count of all holders

New transaction

Wed, 22 Oct 2025 06:45:26 +0000

How do we know if we have a new transaction? i saw in the docs that we are going to use `blocknotify` but I checked the explorer, it doesn't use `blocknotify`.. can you guide me? not a python dev so im having a problem understanding the logic.. I dont want to run a scheduler just to check if there is a new transaction

Transaction ID hash

Tue, 25 Mar 2025 09:10:33 +0000

Which values, if any, are input into the transaction ID hash?

Limits on attachment size

Mon, 24 Feb 2025 11:56:44 +0000

What are the limits on attachment size?

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?

Error code 26. Only 1 node.

Tue, 23 May 2023 16:47:31 +0000

I am using Multichain with 1 node and wallet inserting data currently. I get the following error:

error code: -26

error message:

Error: this transaction was rejected. This may be because you are sharing private keys between nodes, and another node has spent the funds used by this transaction.

How can fix this error? I have a lot of data stored so ideally I do not have start a new chain and reinsert data again.

Thanks!

Send multiply assets in one transaction

Sun, 16 Apr 2023 06:03:26 +0000

Hi, so, two different users, sent me 2 different assets, A and B, obviously, UTXOs with this assets resides in different transactions. What I want, is to consume this UTXOs and send TX to another user with assets A+B in one transaction? Just like we do with native coin, combining UTXOs value until it become >= the value we want to send. All my tries failed with typical node error, mandatory-script-verify-flag. All inputs are signed as it needs to be done with native coin inputs.

Second question, so if the case above is not possible and I will need to create two TXs to send asset A and B, will I be able to send assets A and B in one transaction in case this assets resides in one UTXO from one user?

Thanks in advance

Vout hex decode

Thu, 18 Aug 2022 12:38:20 +0000

Hi, we have tx example: https://explorer.xfccoin.io/api/getrawtransaction?txid=2c471ad416f3098edd2a3c259e87e165ed1420e7e16c93dc16b699aa4e47cf49&decrypt=1

Vout 0 hex 76a914c7e599002aa10db30323c355e019e18cea440ebc88ac1c73706b71...

What does this single byte between p2pkh script and metadata do? How to interpret it?

Vout 1 hex:

76a914a8d59dfa8a7478240aaaacb6f5bc4b46614a793688ac4d040373706b71...

Again what is this byte sequence for?

Additional question, if i have some assets: x(10) y(10) z(10) and I am sending one X asset to someone, this tx should ALWAYS contain change vout with x(9) y(10) z(10) and if I am creating tx from scratch (without multichaind) - I will have to create this change output by myself with all unspent assets I have?

Vout n[2] in "issuefirst" transaction

Thu, 04 Aug 2022 07:52:09 +0000

Hi, somehow my previous question went to approvement once again, im duplicating it here.

So the question is - what is third vout in this transaction for: https://explorer.xfccoin.io/api/getrawtransaction?txid=9a65248b9e7007fabbdeef0054d7d0eb58f002b28a75ec6b1899fd6d5c21e3be&decrypt=1

I saw previous answer by admin, and it says that this vout is change for the address who issued new asset, but as far as i understand it is not the case. Cause change address is totally different from issuer address in this transaction.

Issuer: faCGaHimGTPf1bt3PJJfnjLLMadi4Vtc6gvuMp

Third vout: fPnjGLkQdBkc6CRecs4TPG1GnG1zuoKXgaueEe

I wanted to investigate the effect of increasing block creation time and block creation interval.

Thu, 06 Jan 2022 10:09:06 +0000

I ran load testing of 15 minutes on a network of 10 nodes all belonging to the same chain. Our blockchain only had these 10 neds in its network and all of them were running jmeter request generator for 15 minutes. Each request was exactly same with same data and same size.

When i did this experiment with BCT: 5sec and BS: 16MB and mine empty round OFF, i logged information of each block created in a file till no more blocks were being created.

I got 316 blocks in total and 5 out of them were empty (1 transaction only). the rest 311 had more than 1 transactions. The block with the most number of transactions had 22742 transactions. And average of all non empty blocks(311) was 798.

When i did this with BCT 10 sec and BS 32MB and mine empty round OFF. I got 324 blocks in total and 191 out of them were empty (1 transaction only). the rest 133 had more than 1 transactions. The block with the most number of transactions had 41647 transactions. And average of all non empty blocks(133) was 2060.

Can you tell me why we have more empty blocks when BCT was increased.

what is the difference between Stream items and transaction ?

Sun, 21 Nov 2021 07:15:43 +0000

Hello,

what is the difference between Stream items and transaction ?

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.

Single cold node, in-wallet address performance

Mon, 21 Jun 2021 15:55:53 +0000

Hello,

for a University project, we're currently evaluating the possibility of using Multichain as a financial transaction journal engine, with the basic principle of representing each user account as an address in the wallet and using direct RPC calls to read and write information. With this central database approach in mind, we're thinking of running one node only as there's nothing we'd gain from the decentralisation, simply inside our cluster away from the public.

As part of a performance estimation, we tried setting up a chain to the best of our understanding, aiming to optimise as much for performance as possible:

chain-protocol = multichain
chain-description = MultiChain test-10k
root-stream-name = root
root-stream-open = true
chain-is-testnet = false
target-block-time = 2
maximum-block-size = 8388608
maximum-chunk-size = 1048576
maximum-chunk-count = 1024

anyone-can-connect = false
anyone-can-send = true
anyone-can-receive = true
anyone-can-receive-empty = true
anyone-can-create = false
anyone-can-issue = true
anyone-can-mine = false
anyone-can-activate = false
anyone-can-admin = false
support-miner-precheck = true
allow-arbitrary-outputs = false
allow-p2sh-outputs = false
allow-multisig-outputs = false

setup-first-blocks = 3
mining-diversity = 0.0
admin-consensus-upgrade = 0.0
admin-consensus-txfilter = 0.0
admin-consensus-admin = 0.0
admin-consensus-activate = 0.0
admin-consensus-mine = 0.0
admin-consensus-create = 0.0
admin-consensus-issue = 0.0

lock-admin-mine-rounds = 0
mining-requires-peers = true
mine-empty-rounds = 0
mining-turnover = 0.0

initial-block-reward = 0
first-block-reward = -1
reward-halving-interval = 52560000
reward-spendable-delay = 1
minimum-per-output = 0
maximum-per-output = 100000000000000
minimum-offchain-fee = 0
minimum-relay-fee = 0
native-currency-multiple = 100000000

skip-pow-check = true
pow-minimum-bits = 1
target-adjust-freq = -1
allow-min-difficulty-blocks = true

only-accept-std-txs = true
max-std-tx-size = 4194304
max-std-op-returns-count = 32
max-std-op-return-size = 2097152
max-std-op-drops-count = 5
max-std-element-size = 40000

default-network-port = 4771
default-rpc-port = 4770
chain-name = test-10k-fixed
protocol-version = 20012
network-message-start = f9f9cff0
address-pubkeyhash-version = 00330835
address-scripthash-version = 051c4624
private-key-version = 8013627a
address-checksum-value = 906c59f5

genesis-pubkey = 036b0f05c206bb7ac8e6bfd2869f473cf4b4acb0b94195944fe0371a2bfb3157f7
genesis-version = 1
genesis-timestamp = 1618841128
genesis-nbits = 536936447
genesis-nonce = 271
genesis-pubkey-hash = f0b759e6726332558339c7b7a8f6f8721e7927c5
genesis-hash = 00e08d153bf75996cfd758c6d09fd1fca23e7bb836fb47ea59ba15e473f381c5
chain-params-hash = b846252b96d6e3bc24b74eaaaa94163e3fe65584f1d1325992849054dfe07045

We then proceeded to create a total of one million addresses on the chain, using a custom golang script with 10 goroutine workers. This process took about 7 hours. Not stellar, but seeing as it would not be part of a burst phase and only needed for new user signups, it's acceptable.

We then proceeded to issue some different assets for each of the generated addresses using IssueMore (to simulate a user entering the ecosystem and having "paid in" to his account), also using a golang script. This process unfortunately is very slow. Each calls takes about 2 seconds. Since the IssueMore would only be used as a "user is paying in new currency" action, it also should not be that burstable, but 2 seconds on a completely empty chain sounds bad. It also prevents us from creating an equal distribution of currency among the addresses, as it would 2 million seconds per asset.

We have not yet proceeded to test the performance of sending assets between addresses. We were thinking of using SendAssetFrom to send currencies between different addresses - and sending to the burn address in order to simulate a user "cashing out" (with the currency leaving the ecosystem again)

Concrete questions

With the problem and data laid out above, I'd appreciate any feedback, especially regarding:

Is Multichain a sensible choice for a centralised financial transaction database with high throughput?
Are there any steps we can look at to further improve the current performance?
Is there any data available on general scalability of Multichain?

We're happy to supply more information as required and thankful for any further insights.

Kind regards,

Peter

Is there a way to apply some custom filter while fetching data from the stream?

Fri, 04 Jun 2021 06:57:31 +0000

Hello Team,

I'm looking for the solution to get data from the stream based on some custom filters.

Since I have a transaction stream where I save the details of each wallet transfer along with some metadata.

Here I am using transaction hex as key in the stream.

Following information I'm storing into transaction metadata:
1) user-email
2) transaction type (credit/debit)
3) amount
4) timestamp

Now when I use the liststreamitems command it will return all available transactions from the stream.

I want some custom filters to fetch data based on specific user email or if metadata contains a transaction type of "Credit / Debit" only then the transaction should return from the stream.

So is there any way to apply such criteria when getting records from the stream?

Relation of Block creation and Number of Transactions

Mon, 29 Mar 2021 07:28:03 +0000

I am running a node on my machine and using default configuration parameters. Each time , I perform single (only one) transaction, I see the increase in number of blocks using "getinfo" command. My multichain version is 2.1.2. From where these ghost blocks are coming.

free transaction rejected by rate limiter

Sun, 07 Feb 2021 23:28:12 +0000

Dear Team,

I'm doing a load test on MC 2.0.2. Using a script I wrote a raw transaction having about 100 inputs and 100 outputs.

I signed it offline using a cold node and then I sent in the network with sendrawtransaction.

The transaction is accepted by the node and I got the txid back but I realized it is still in the mempool. I found that in the debug.log file of all the nodes in the network I have the following ERROR line:

2021-02-07 22:29:58 ERROR: AcceptToMemoryPool : free transaction rejected by rate limiter

Could you kindly explain the the meaning and the reason why the transaction is not mined by any miner?

Thanks

Explorer cannot load transaction

Thu, 17 Dec 2020 00:54:09 +0000

Dear Team,

I'm working with MC 2.0.2 and last version of explorer. After installing and running with --no-serve I have the following error:

...

block_tx 281 296
block_tx 282 297
Exception at 83395
Failed to catch up {'blkfile_offset': 0, 'blkfile_number': 100000, 'chain_id': 1, 'loader': u'default', 'conf': None, 'dirname': u'/home/fabio/.multichain/testnet04', 'id': 3}
Traceback (most recent call last):
File "Mce/DataStore.py", line 2903, in catch_up
store.catch_up_dir(dircfg)
File "Mce/DataStore.py", line 3215, in catch_up_dir
store.import_blkdat(dircfg, ds, blkfile['name'])
File "Mce/DataStore.py", line 3347, in import_blkdat
store.import_block(b, chain = chain)
File "Mce/DataStore.py", line 1201, in import_block
tx['tx_id'] = store.import_tx(tx, pos == 0, chain)
File "Mce/DataStore.py", line 2128, in import_tx
store.spent_txout_assets(txin['prevout_hash'], txin['prevout_n'], chain, tx['hash'], pos)
File "Mce/DataStore.py", line 2159, in spent_txout_assets
address = util.hash_to_address_multichain(vers, pubkey_hash, checksum)
File "Mce/util.py", line 171, in hash_to_address_multichain
vh += hash[pos:pos + 5]
TypeError: cannot concatenate 'str' and 'list' objects

This problem is not new. You already suggested a way out here:

https://www.multichain.com/qa/16963/explorer-attributeerror-nonetype-object-attribute-startswith?show=16963#q16963

but in my case it doesn't solve.

Can you help me?

Thanks for your support.

Fabio

Throughput per node vs throughput overall

Mon, 06 Jul 2020 23:29:43 +0000

I'm trying to estimate the transaction throughput by sending multiple sequential transactions using my node's burner address. The test shows that the single node can process around 100 tx/s.

Let's say I add another node to the network. Each node independently processes its transactions. Does this mean that, with even distribution of transactions between the two nodes, the throughput of the entire blockchain is now 200 tx/s? (if we ignore propagation time between nodes)

list transactions RPC on chain regardless its'effect on asset or streams

Thu, 04 Jun 2020 14:53:06 +0000

Is there API or any work around to list count of transactions regardless its' effect on node wallet or streams or assets..etc. My use case is: I want to list most recent transactions regardless to its' content and listwallettransactions only list transaction that has effect on node wallet and my use case contains some transactions that didn't contain this prooerty as per below:

getrawtransaction 2d40b89a90114ee39583b37a103854e4a1d506ca69c93006113303004cd22739 1

{
    "hex" : "01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff0c02dd0e0101062f503253482fffffffff010000000000000000716a4c6e53504b624630440220755becff7e2b9cac31d702e0c1c965a38f40487eec9096dc61742b3af0bd9db70220227ae6a72d83cf3284311405359f333468632fbe13d8528b97658a36eb2f7715032102006a8c25a8ac1e90cb6a8881e59b8829b400bf45b8f2ee28d3fcb32d15a2c6e800000000",
    "txid" : "2d40b89a90114ee39583b37a103854e4a1d506ca69c93006113303004cd22739",
    "version" : 1,
    "locktime" : 0,
    "vin" : [
        {
            "coinbase" : "02dd0e0101062f503253482f",
            "sequence" : 4294967295
        }
    ],
    "vout" : [
        {
            "value" : 0,
            "n" : 0,
            "scriptPubKey" : {
                "asm" : "OP_RETURN 53504b624630440220755becff7e2b9cac31d702e0c1c965a38f40487eec9096dc61742b3af0bd9db70220227ae6a72d83cf3284311405359f333468632fbe13d8528b97658a36eb2f7715032102006a8c25a8ac1e90cb6a8881e59b8829b400bf45b8f2ee28d3fcb32d15a2c6e8",
                "hex" : "6a4c6e53504b624630440220755becff7e2b9cac31d702e0c1c965a38f40487eec9096dc61742b3af0bd9db70220227ae6a72d83cf3284311405359f333468632fbe13d8528b97658a36eb2f7715032102006a8c25a8ac1e90cb6a8881e59b8829b400bf45b8f2ee28d3fcb32d15a2c6e8",
                "type" : "nulldata"
            },
            "data" : [
                "53504b624630440220755becff7e2b9cac31d702e0c1c965a38f40487eec9096dc61742b3af0bd9db70220227ae6a72d83cf3284311405359f333468632fbe13d8528b97658a36eb2f7715032102006a8c25a8ac1e90cb6a8881e59b8829b400bf45b8f2ee28d3fcb32d15a2c6e8"
            ]
        }
    ],
    "blockhash" : "00964ff493764e24b142b22d1b17d16ed9115bf89ad1f8a3f45eca9864bce683",
    "confirmations" : 50,
    "time" : 1591190766,
    "blocktime" : 1591190766
}

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??

Error code: -26 error message:16: bad-txns-input-duplicate

Sun, 05 Apr 2020 17:04:38 +0000

Hello, multichain, I want to use a transaction filter: approve asset transfer which is mentioned in Github link below:

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

Basically this filter is used to check whether the transaction is pre-approved or not. and for making an approval they have given steps in the above github link.

Basically first I created DemoAsset1 with quantity 100 in the address: 1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V then I followed below steps

step1: to send an approval

Command:

sendfrom "1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V" "1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V" '{"DemoAsset1":100,"data":{"json":{"type":"approval","maxraw":1000,"expiry":1586083567}}}'

Address 1KB5G.. already had an asset with the name: DemoAsset1 but I wanted to add inline metadata i.e.

"data":{"json":{"type":"approval","maxraw":1000,"expiry":1586083567 -Necessity for adding "data" attribute was that in the github link provided above, filter code is checking for thr type:"approval". The transaction with type approval can only pass that filter code. That is why it was important for me to add this inline metadata

So for adding inline meta data I used first above mentioned command "sendfrom" where you can see from-address and to-address is same. that means I'm sending DemoAsset1 to the same address but including inline meta data i.e. "data" attribute.

Step 2: command:

createrawsendfrom "1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V" "{\"1SF9LjmCqsA3NtVVPUe54wYwyGt6NnAG21ufU9\": {\"DemoAsset1\":5}}"

Using above command now I am trying to send amount 5of DemoAsset1 from 1KB85GgV...address to 1SF9..address. Yet I have not signed the transaction. now in output I'm getting one tx-hex.

Step3: Command:

appendrawtransaction
"010000000180699ec087e795406692b37696e4a6ca6430dd79d29fe71995d8750c7248d2040000000000ffffffff0200000000000000003776a914bac7060886d618cf2ead989a6d65b449e071497588ac1c73706b71784b4999c545a9b3494f7bdf06fa06c032000000000000007500000000000000003776a9148678ce5ac500e4f06bacdb58d7397319baed19be88ac1c73706b71784b4999c545a9b3494f7bdf06fa06c0b6030000000000007500000000" "[{\"txid\":\"04d248720c75d89519e79fd279dd3064caa6e49676b392664095e787c09e6980\",\"vout\":0}]" "{\" 1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V\":{\"DemoAsset1\":5}}"

In above command using appendrawtransaction I'm appending highlighted txid and vout to the above transaction which was created using createrawtransaction. Added txid and vout is the txid of DemoAsset1. I got that txid and vout by using command listunspent. O/P: I got another long tx-hex code.

Step 4: signrawtransaction above-long-tx-hex

o/p: Long-tx-hex.

Step 5: Now to send raw transaction I finally took last step:

sendrawtransaction long-tx-hex(got in step 4)

After attempting step 5. I got the error mentioned in the question. Error code: -26 error message:16: bad-txns-input-duplicate . i'm attaching here the decoded raw transaction after step 3:

I want to share UTXO but characters limit is not allowing me. So I will ask relatable question with the title

"Error code: -26 error message:16: bad-txns-input-duplicate part 2" please refer to this question too for understanding this error fully.

Transaction couldn't show transferred amount & doubts related to timestamp

Wed, 25 Mar 2020 07:14:54 +0000

Hello Multichain Team,

I have made one transaction with below command:

> multichain-cli chain1 sendwithdatafrom 1STekiSd28vXU6egrGkHtBzMKPJd4eGJLThR3W 1XErJMb4XRvTZuPAbncbrskbqydy8r2WW7yDDH "{\"GBP\":10,\"data\":{\"text\":\"hello\"}}" "{\"text\":\"25th march, 2020\"}"

It gives me the transaction hex-code & i used it with getwallettransaction command as below:

> multichain-cli techforce getwallettransaction b24d34809b0e3b30d9348f78d424cedb78d61b1a90ad8f6e9e461f4c45094ab4
{"method":"getwallettransaction","params":["b24d34809b0e3b30d9348f78d424cedb78d61b1a90ad8f6e9e461f4c45094ab4"],"id":"69501022-1585118683","chain_name":"techforce"}

{
    "balance" : {
        "amount" : 0,
        "assets" : [
        ]
    },
    "myaddresses" : [
        "1STekiSd28vXU6egrGkHtBzMKPJd4eGJLThR3W",
        "1XErJMb4XRvTZuPAbncbrskbqydy8r2WW7yDDH"
    ],
    "addresses" : [
    ],
    "permissions" : [
    ],
    "items" : [
    ],
    "data" : [
        {
            "text" : "25th march, 2020"
        }
    ],
    "confirmations" : 0,
    "txid" : "b24d34809b0e3b30d9348f78d424cedb78d61b1a90ad8f6e9e461f4c45094ab4",
    "valid" : true,
    "time" : 1585118667,
    "timereceived" : 1585118667
}

Here in below output i'm not having any detail of transferred amount which is 10 GBP. where should i found it?

could you please share the details about this last two parameters time & timereceived.
I would like to use that timestamp to convert it into date & show on transaction history.

does this timestamp contains milliseconds with date time or only time?

Thanks in advance.

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?

How to create transaction filters?

Fri, 24 Jan 2020 05:15:14 +0000

Hello everyone,

I am a beginner. Currently I have started to learn Multichain's transaction filter. But when i read the documentation i am not able to understand that how do i start creating transaction filters? Where it should be located? How it is processed by every node?

It would be really great if someone can explain me its each step for How to create transaction filters? Where to create? How to process or run that transaction filters?

Please help me with this asap.

Setup for 200-300 Tx per second

Tue, 14 Jan 2020 20:38:17 +0000

Hello MC team

I am developing a solution based on 3 nodes ( one for main , second for receiving all the transactions generated against the first node and a third node for backup purposes ) that will have mining permission and this nodes will receive a top peak of 300 transaction per second (api calls) to one of the nodes.What is the recommended hardware and configuration ( of the chain) for supporting this burden and give flexibility for more than 1000 transactions per second in a near future.? These transactions include validating of course.

I am using multichain Comunity edition

Best regards.

How can I test max TX per second using a RPC API calls

Sun, 12 Jan 2020 23:50:45 +0000

Hi MC team

I want to test my maximun Tx per second , aI have a small node running locally and I would like to make a benchmark test using my favorite json rpc client ( Insonmia ) , The test I want to run is sending assets from an address to other ( in the same node), how must I configure the api call for this can be achieved? For example. How can I configure this to be done multiple calls at the same time?

Example below.

http://127.0.0.1:2654/

{

"id": 0,

"method": "sendasset",

"params": [

"19TAPQMirkQhCfaFf19vLWXS8tqWRXWwYtQPNG",

"dolar",

3.00

]

}

Handling decimals amounts in transactions

Wed, 08 Jan 2020 20:30:16 +0000

Hello, I have problems transferring amounts with decimals of an address to the sendassetfrom method, in my case I must handle a local currency whose value is equivalent to 3000, when making a payment of 10000 with a conversion ratio of 10000/3000 = 3,333333333333333 but the balance in the reciever address only shows me 3.33 and at the time of showing the balance in my custom local currency with the following conversion 3.33 x 3000 = 9990.

The amount in local currency for the address that received does not match the amount sent, because multichain does not reflect the full amount of decimals. How can I do so that Multichain can save the entire number of decimals so that it does not affect my custom conversion.

Trusted multistep realtime transaction

Sat, 26 Oct 2019 22:30:27 +0000

I'm not sure if this is possible using multichain but I'm trying to build a multi-step app where for e.g. to accomplish Transaction A, we want the processing to go through Step1,Step2 and Step3. Similarly to accomplish Transaction B - Step1,Step2 and Step4. Say each of the steps is executed in a distributed way by different computer/container. As each step is executed by respective computer, we want to make sure previous step was executed, and the call is coming from computer running the previous step. When I look at transaction A after completion, I should be able to prove that all steps were completed by respective authentic players. How can I accomplish this for a real-time application using multichain?

How to include my base64 signature to spend a UTXO

Sat, 05 Oct 2019 21:54:11 +0000

I'm trying to use the bitcoinjs-lib to spend an UTXO. I have a signature from the prior transaction that is in base64 format. I have the following standard transaction builder as a starting base:

var bitcoin = require(‘bitcoinjs-lib’);
var key = bitcoin.ECKey.fromWIF("put data here");
var tx = new bitcoin.TransactionBuilder();
tx.addInput("txid here", 1);
tx.addOutput("receiver addr here", 345000);
tx.sign(0, key);
console.log(tx.build().toHex());

var key = Bitcoin.ECKey.fromWIF(‘private key’);
var tx=Bitcoin.Transaction.fromHex(‘HEX-data from step 1’);
tx.sign(0, key);
tx.toHex(); // HEX-data of signed transaction

All of these standard transaction builders like the above no matter what the programming language insist on using a WIF key format. But I need to use a base64 signature that I have already to build the transaction. I'm participating in a challenge and apparently that is the challenge --- to figure out how to spend the UTXO using a base64 signature that was provided participants. Can someone help me with this?

detail in multiChain transaction

Wed, 18 Sep 2019 03:47:33 +0000

the lock script in a tx output field:

"asm": "OP_DUP OP_HASH160 36a8181bca44ef1fa43df647a6c8aa87ec27ca9c OP_EQUALVERIFY OP_CHECKSIG 73706b71e1c0b8310dafd3c8c4d741b2dbd6b99a00e40b5402000000 OP_DROP"

this field f73706b71e1c0b8310dafd3c8c4d741b2dbd6b99a00e40b5402000000

how he data before OP_DROP generate?

mandatory-script-verify-flag-failed (Script too big)

Thu, 22 Aug 2019 07:20:33 +0000

I issued 8000 to 15000 assets for 1 address in a loop, and when i'm trying to transfer all assets to set of other addresses some are not transferred and it gives error "Error Code: -26 Error Message: Transaction was rejected: ConnectInputs failed: mandatory-script-verify-flag-failed (Script too big)"

From my research, i found that some assets were transferred to the same address successfully and others are not getting transferred.

All addresses have connect, send and receive permissions

Can anyone suggest me a solution for this

mchn: Coin selection: Signing transaction failed

Wed, 21 Aug 2019 06:10:22 +0000

Hello,

I'm getting "mchn: Coin selection: Signing transaction failed" out of the blue. Why am I getting this error message in my chain.

I have a basic send transaction I need to sign

Tue, 20 Aug 2019 19:21:29 +0000

When using send to move an asset between addresses, is it possible to sign the successful transaction? If so, is there an example? Which parameters do I need?

Pre-condition to allow a node to join the seed node

Tue, 25 Jun 2019 18:26:26 +0000

Hello,

We are currently trying to connect a s390x (Z Virtual Machine) to an existing x86_64 (master node) running a multichaind daemon, doing so we encountered the following on master's debug log

2019-06-24 18:19:19 Adding fixed seed nodes as DNS doesn't seem to be available.
2019-06-24 18:19:26 MultiChainMiner: Block Found - 006ee4b75bb2291cda8639d58abfef3238f35a043b014ea93e89ba1b3e2a3d8f, prev: 00c6aae5b436e564266bfddfed14babaf0088d958dff1ce3d60f2db65ac47ccb, height: 6, txs: 1

We would like to know the pre-condition to allow a new node to join the seed node. Also,

1) On Z-Slave node,debug.log does not show receive any incoming message.
2) Do we have to additionally configure firewall ports to allow any incoming message.

A doubt with assets and transactions

Fri, 14 Jun 2019 18:44:39 +0000

A high volume of assets can slow the performance of the blockchain? Internally in the blockchain moving 1 asset to another address is the same like moving 10000 assets? I mean the 1 assets transaction represents the same amount of memory and cpu resources that the 10000 transaction in the node?

Transaction offline

Sun, 03 Mar 2019 12:37:04 +0000

how could I set up a transaction without the help of the cli? such as how do wallet hardware do it?

How to properly test transactions throughput?

Fri, 01 Mar 2019 18:25:11 +0000

Hello,

I’d like to test transactions throughput.

My idea was:

only one node
only one address involved
only one asset issued
make n transactions (calls to sendasset(); one unit sent)

I am using python 3.7 and Savoir. I take the time used to make n transactions, thus the average time per transaction and finally the transactions per second.

I tested on different machines (with n = 100, 1000, 10000) and I don’t get good results when comparing to these: https://www.multichain.com/blog/2017/06/multichain-1-beta-2-roadmap/ .

In particular, with n=10000, I get ~11 TX/s. Am I doing something wrong? Is my machine not good enough (Intel Core i7 2600 @ 3.40 GHz with 8 gigabytes of ram)?

Also, are there any initial blockchain parameters that could influence the throughput so much?

Thank you very much.

multiple transactions in one transaction? transection

Fri, 08 Feb 2019 15:48:19 +0000

hi , i am implementing multiple transactions in a single transaction which should contains like send from Alice account to Bob , then Bob send some amount Tom . i there any method to make transaction between address?????

Who will add block of transactions or streams into chain(i.e., block chain)?

Tue, 05 Feb 2019 08:42:44 +0000

Data Streams with Native Currency as fee?

Mon, 04 Feb 2019 21:02:47 +0000

Hello!

I was reading the documents and as far I can tell Data Streams aren't transactions in the blockchain in the sense that they don't use a UTXO to build upon itself. They function similarly to a broadcasted message throughout the nodes, right?

My main issue here is that I'd like to attach an asset with the stream itself that would work as an incentive for miners to run the network. Meaning that everytime someone publishes using streams they would have to attach an unspent coin to be picked up by miners.

Do you think of anything else that looks like this? I thought about using Inline Metadata, but (1) it doesn't have off-chain/on-chain data management as Data Streams 2.0 and (2) the "publishing act" might not have a properly "receiver" neither an amount to send to the "receiver".

blockchain transaction linkage

Thu, 31 Jan 2019 11:47:41 +0000

Hello devs,

Need to clarify some fundamentals , After setting up multichain network whenever we do any transaction with other peer then multichain says that its all data stored in multichain network what dose that mean?
full blockchain stored in network means in our node right?

Parameters of getfilterstreamitem()

Wed, 16 Jan 2019 16:35:49 +0000

Hi,

Is it possible to know all the parameters return by getfilterstreamitem()?

Many thanks in advance ;)

Does all nodes recieve the transactions at the same time

Tue, 15 Jan 2019 15:15:02 +0000

Does Multi-chain framework send transactions (keys in a stream) in a quick manner to all nodes, in a critical scenario?

The requirement is that the transaction should arrive quickly to all nodes in the exact same order and in exact same time, provided the nodes are reliably connected.

send an amount of asset to multiple addresses at the same time

Fri, 11 Jan 2019 15:55:43 +0000

Hi MC Team

I need to send a quantity of 1 unit of an asset to many addresses (at the same time) from one address (+1000) but in an unique transaction. How can I do this using rpc api commands?

Thanks.

UTXO transaction based model in multichain

Wed, 09 Jan 2019 13:32:39 +0000

Hello guys,
I was exploring UTXO model in multichain so i have issued 1000 assets to address 1Xs5ZRKETcsATQp4AgZPodfco14Amcx4FvYoc1 and after that i have send 100 assets to 19Ga6X4QY6TYgsXJQKJWDrThNJ7SvuwHYNNTCS so according to that i could identify UTXO transaction based on spendable property .(see below unspent command )
Now in this transaction spendable property is false for sender that means that was a unspent transaction input for sender(1Xs5ZRKETcsATQp4AgZPodfco14Amcx4FvYoc1) and sender has locked that tx and send it to reciever (19Ga6X4QY6TYgsXJQKJWDrThNJ7SvuwHYNNTCS) for receiver that tx is unspent tx output (UTXO), am i right?
2)what is inside scriptPubKey for sender(1Xs5ZRKETcsATQp4AgZPodfco14Amcx4FvYoc1)?
3)what is inside scriptPubKey for receiver(19Ga6X4QY6TYgsXJQKJWDrThNJ7SvuwHYNNTCS)?
4)where could i find UTXO db?
5)how can i see unspent transaction input for each address?

chain1: listunspent
{"method":"listunspent","params":[],"id":1,"chain_name":"chain1"}

[
    {
        "txid" : "04b5ca711bc525f23cec29fff18b8fa01583ec8ae4e9e8ff5ba5dd2071739bf3",
        "vout" : 0,
        "address" : "19Ga6X4QY6TYgsXJQKJWDrThNJ7SvuwHYNNTCS",
        "account" : "",
        "scriptPubKey" : "76a9143d2d7e8db672718c20365ba06eee65f7b1e408f988ac1473706b700400000000000000ffffffff66ee355c75",
        "amount" : 0.00000000,
        "confirmations" : 10,
        "cansend" : false,
        "spendable" : false,
        "assets" : [
        ],
        "permissions" : [
            {
                "for" : null,
                "connect" : false,
                "send" : false,
                "receive" : true,
                "create" : false,
                "issue" : false,
                "mine" : false,
                "admin" : false,
                "activate" : false,
                "startblock" : 0,
                "endblock" : 4294967295,
                "timestamp" : 1547038310
            }
        ]
    },
    {
        "txid" : "04b5ca711bc525f23cec29fff18b8fa01583ec8ae4e9e8ff5ba5dd2071739bf3",
        "vout" : 1,
        "address" : "1Xs5ZRKETcsATQp4AgZPodfco14Amcx4FvYoc1",
        "account" : "",
        "scriptPubKey" : "76a914e45b2ee7f8b041a657980786c23ac4692f509b2788ac",
        "amount" : 0.00000000,
        "confirmations" : 10,
        "cansend" : true,
        "spendable" : true,
        "assets" : [
        ],
        "permissions" : [
        ]
    },
    {
        "txid" : "e739464ab3c29aae1a73a1e5f8c8830d3759aa3089a077463734102adccb227d",
        "vout" : 0,
        "address" : "19Ga6X4QY6TYgsXJQKJWDrThNJ7SvuwHYNNTCS",
        "account" : "",
        "scriptPubKey" : "76a9143d2d7e8db672718c20365ba06eee65f7b1e408f988ac1c73706b7153e8925805934a0da47f950b01816389102700000000000075",
        "amount" : 0.00000000,
        "confirmations" : 10,
        "cansend" : false,
        "spendable" : false,
        "assets" : [
            {
                "name" : "asset1",
                "assetref" : "25-265-25481",
                "qty" : 100.00000000
            }
        ],
        "permissions" : [
        ]
    },
    {
        "txid" : "e739464ab3c29aae1a73a1e5f8c8830d3759aa3089a077463734102adccb227d",
        "vout" : 1,
        "address" : "1Xs5ZRKETcsATQp4AgZPodfco14Amcx4FvYoc1",
        "account" : "",
        "scriptPubKey" : "76a914e45b2ee7f8b041a657980786c23ac4692f509b2788ac1c73706b7153e8925805934a0da47f950b01816389905f01000000000075",
        "amount" : 0.00000000,
        "confirmations" : 10,
        "cansend" : true,
        "spendable" : true,
        "assets" : [
            {
                "name" : "asset1",
                "assetref" : "25-265-25481",
                "qty" : 900.00000000
            }
        ],
        "permissions" : [
        ]
    }
]

6)As per my understanding of bitcoin in that when sender sends any asset to receipient then that transaction gets locked and send to receipient.
But here when i run lockunspent it is giving me output like this:

how to see all locked transaction which was initiated by sender?

chain1: listlockunspent
{"method":"listlockunspent","params":[],"id":1,"chain_name":"chain1"}

[
]

7) How can i identify sender does not trying to do double spend of particular asset?

Thanks,
Khetesh Rotangan

sendrawtransaction giving error code -26

Fri, 28 Dec 2018 09:54:56 +0000

While sending the final signed hex to the sendrawtransaction API it outputs me this error message with error code 26:

16: ConnectInputs failed: mandatory-script-verify-flag-failed (Script evaluated without error but finished with a false/empty top stack element) can someone explain me why I am not getting final transaction id instead of this error message?

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.

Who can unlock locked unspent transactions?

Mon, 10 Dec 2018 09:14:21 +0000

For the locked unspent transactions shown in listlockunspent, are there specific permissions required to unlock those transactions? Or anyone can unlock the transactions?

how to make a user enter the passphrase before signing any transaction?

Mon, 10 Dec 2018 08:35:59 +0000

Is it possible to ask user to enter the passphrase before signing a transaction on the network ?

Transaction to send data in exchange of asset

Tue, 27 Nov 2018 18:42:36 +0000

I have a scenario where 2 devices (Node A and Node B) are present in network. Node A and B has some quantity of asset1. Node A wants to share his data for some incentive asset1.

There are 2 streams present one is for metadata and other one is for original data. The Node A publishes encrypted data to original data stream and metadata along with hex(original data) (for checksum of data associated with it). The node maintains metadata and data txid relationship.

Now, Node B wants to purchase the data published by Node A in exchange of asset1 (Lets say 10 quantity). How can I implement this using atomic raw transaction? I would also have to share the secret key encrypted used to encrypt data using public key of Node B for confidentiality.

What is the best possible way? please help me out.