MultiChain Development

  • Can Multichain blockchain be used in access control system May 20, 2018
    I am working on a product called access control system(Employees swipes their employee badge or enter pin to have access to floors/door/building in an organization). We have centralized database conne …
  • Multichain can do this? May 20, 2018
    Please clarify me first: (I do search already about them but after all that i am just a newbie)If i am understanding correctly!Then the currency like bitcoin should make a demand like Exclusive items …
  • Each new node starts with an initial amount? May 20, 2018
    Hi, I am preparing a  workshop with multichain in a classroom for 20 students and I want every student to start his node with an initial amount of one particular asset so they can start sending amount …
  • Is it possible to disable transactions validation on a second node? May 19, 2018
    Hello guys! A second node is joining an existing chain. The sync process takes lot of time. Is there any possibility to speed up the sync process? I think when I disable the validation process of each …
  • Connection between 2 chains created in the same node, asset transfer problem May 18, 2018
    Hello MC Team I have created 2 different chains ( on the same node and machine ) A and B , chainA parameters are the same than B (except RPC port and network port) . I have started both daemons and is …
  • Need to push json data to Multichain, in php May 18, 2018
  • couldnt connect to seed node, firewall problem May 18, 2018
    i followed this https://blog.cotten.io/deploying-a-blockchain-with-multichain-on-amazon-ec2-b288ae118b30 & then https://www.multichain.com/getting-started/       [ec2-user@ip-172-31-18-195 ~]$ nan …
  • SPV Wallet ready for connecting to multichain May 17, 2018
    Hello MC I am  looking for a spv wallet capable to connect to multichain,not a bitcoin forked wallet ,  I need a working wallet for managing assets and native currency. No problem is this a commercial …
  • Automatic atomic exchanges across nodes May 17, 2018
    I need the ability to exchange assets between two addresses that are in wallets on different nodes in an automatic way, how can this be done?     i.e:  I can issue preparelockunspent, and createrawexc …
  • about publish data May 17, 2018
    i want publish a file and two parameter, but i don't know finish it. i'm try add details in the createrawsendfrom command, but i can't get it have any method?
  • Error reading config file May 16, 2018
    Having an issue where it's not reading the conf file properly for the port. ERROR: reading configuration file: the options configuration file contains an invalid line 'port 2750'I have …
  • Is the access of elements within a stream given a key indexed in any way? May 16, 2018
    In the worse case, would we need to scan through all the elements of a stream to find the relevant item?
  • dumpwallet / importwallet: change and reserve addresses May 16, 2018
    Hi. When I want to synchronize a wallet between 2 or more nodes using dumpwallet, is it ok to remove the lines for "reserve" addresses? What about "change" addresses? Are they alre …
  • I am getting Invalid amount from multichain issue method May 16, 2018
    I am using esyBitcoin to call and pass asset information in phpThis is my function that is returning invalid amount when i use the function. Please help mepublic function addAssets($address,$asset_nam …
  • Is there a way to specify more than one key when searching? May 16, 2018
    Say i wanted to get the items where type ="book" and author="JK Rowling"?
  • Format May 15, 2018
    Oh Ok I see , the address is correct in this kind of format (different to regular addresses) , Ok so how can I send an asset to a burnaddress for redeem it ? Thanks in advance
  • How can i query on a subset of the keys for a stream? May 15, 2018
    I have a stream which contains a tuple of keys, i am currently using the alpha 2.0. I don't seem to be able to specify just some of the elements in the tuple.
  • Why are "keys" and "publishers" properties arrays May 15, 2018
    When I call liststreamitems it returns a list of objects like this: { "publishers": [ "13hhTLheZXjFj5owddcBNMu2jnNPxvbUZrrnHx" ], "keys": [ "ASDF" ], "data …
  • Find previous TxId applying to a particular key in a stream May 15, 2018
    I am treating a stream as a time-series, and using the Key to identify objects (which therefore have multiple transactions reflecting changes in state over time). Is there a way to retrieve "adja …
  • External Key Lock unspent asset May 15, 2018
    Is it possible to lock unspent asset for External Key? If yes please teach me how.   Thank you very much!
  • How to find burnaddress in multichain. May 15, 2018
    Hello MC Team My question will be obvious for most of you but…. I am trying to find the burnadddress of a chain created in multichain , I used  multichain-cli getinfo  and the address is shown parti …
  • Rpc calls in same chain but different servers nodes May 15, 2018
    Hi team, The question is simple: how i make rpc calls to different  Node servers of the same chain? Today i only make rpc calls to Master node. Best regards !
  • Time complexity of API calls May 14, 2018
    Is there a page that lists time complexities of API calls? If not, how can I obtain this information? Do I have to go through source code and see how each call is implemented or is there a better way?
  • How do streams work under the hood? May 14, 2018
    As far as I know, blockchains do not provide a way to efficiently retrieve data. For example, if I'm looking for txs with a desired property (e.g. it has an output to a particular address), I sim …
  • Is it possible for a Multichain blockchain to be divided into branches like in bitcoin ? May 14, 2018
    Hello, Is it possible for a Multichain blockchain to be divided into branches like in  bitcoin ? Does the diversity constant have a correlation with this fork phenomenon ? Thank you
  • Error Code -1 value is type obj, expected real May 14, 2018
    Hello,I am trying to use a command issuemore and passing the parameter in json-api as :{"id":1526293256,"method":"issuemore","params":["1C6ZGuhbKsbjKNG6K8Y …
  • How many chains can be running at the same time in one node May 13, 2018
    Dear MC Team I am planning to develop a hosted service for transfering assets from one wallet to another , my question is How many chains can Multichain run at the same time (different ports, and dife …
  • Is the book Mastering Bitcoin by Andreas M.Antonopoulos useful? May 13, 2018
    Hi everyone, Since Multichain is basically a fork of bitcoin core, I am assuming (but still asking), would this book be useful for learning Multichain as well as bitcoin in general?   Dr.Wolfe
  • Connecting to docker instance that's running multichain May 12, 2018
    So I have a multichain instance running on a centos docker image. My main machine is Windows 10 and I can connect to my multichain node and run commands using the multichain-cli application.Now I am w …
  • Broker-Insurer-Broker May 12, 2018
    Please help me to create a POC. Broker creates a policy. Insurer backs the policy. Broker: Step 1: Broker creates a policy. Insurer: Step 1: Insurer creates an offer for  25%. for some premium amt. Br …
  • importprivkey encoding error after upgrading version May 11, 2018
    Hi,I attempted to upgrade from version 1.0.2 to 1.0.4. As part of the process I want to restore some of the addresses I had generated in version 1.0.2. I did this using the dumpprivkey and importprivk …
  • Edit the Assets Details May 11, 2018
    Hello Fellows. I have created an assets with some details into it. Now I want to edit the node details. How can this be achieved. because I can't find any command for editing the block details. T …
  • how can i create an asset but not issue. May 11, 2018
    I want to create an asset proposal including asset price,merchant profit etc. once this asset proposal gets verified by internal team then internal team will issue this asset
  • should i keep the private keys inside the wallet or outside ? May 11, 2018
    should i really save the private key of users outside of the wallet? I have setup 4 multichain  node on digital ocean server talking to each other. so my question is should i really be worried about o …
  • how to update asset in multichain May 11, 2018
    Hi Multichain team you guys have been awesome. i have one more doubt regarding asset.lets suppose i created an asset along with metadata like price,status etc. i used createrawsendfrom api to create a …
  • Can this platform be used to assist in the tracking of an item from one point to another? May 10, 2018
    Sir/Madam, The basis of my question is the traceability of live animals (beef) for verified natural programs and animal well being. Thanks, Dale
  • Multichain Explorer shutting down automatically May 10, 2018
    Hi Multichain,We have set up the Multichain Explorer for our multichains so as to view the list of transactions happening on the nodes.So actually we have two chains i.e. Chain1 and Chain2 so Multicha …
  • Modifying the receipient of transaction fee May 10, 2018
    Where in the multichain source code can I change the recipient of the transaction fee when a specific node mines? Also, among all other addresses in the node, how does Multichain select the address in …
  • how to use multichain blockchain and smart contract for real world use case May 9, 2018
    use case – we have two actor lets say merchant and customer. both merchant and customer register themselves on blockchain (only basic info, private key gets stored on centralized DB).  merchant create …
  • listassets is giving an error HTTP 200 May 9, 2018
    Hello, I am trying to list all assets in multichain web demo but I am getting an error HTTP 200 but when i am running in CMD using multichain-cli chain2 listassets * true I am getting the list of asse …
  • Some questions about to create a points system May 9, 2018
    Hi, MultiChain team,If I design to make a reward points system, I have many questions:1. I just create a new asset on the admin node with unlimited units(can I do it or just create a certain amount of …
  • How are txs stored in a block? May 8, 2018
    How do a MultiChain blockchain stores txs in its blocks? Does it store it like a Merkle Tree (as in Bitcoin) or as just as a list? In particular, if I want to query the blockchain to check whether a c …
  • appendrawmetadata May 8, 2018
    i did the following, preparelockunspentfrom,createrawexchange and lastly fired appendrawmetadata. it generates hex , however when i fire getblock with block number, i cannot see the metadata. if i fir …
  • how can i use walletnotify command to get notification May 8, 2018
    Hi, Could you please give me an example of how to set this runtime param to get notification everytime a new item appended in a stream called stream9 and where can i see all the notifications. how can …
  • Couldn´t connect to server May 7, 2018
    Hi noob here, I´m running win. 10 on host and win 7 on voter node. after mining the genesis block i connected with the second node and it asked to give permissions. When running multichain-cli Name gr …
  • database structure May 7, 2018
    Thank you sir for your answer, but my problem is that i wanna see my database structure. Because i wonna understand for example how transactions are stored? is there an input table? an output table? o …
  • How to implement smart contract using stream May 7, 2018
    Hi Multichain Team,I was reading this blog https://www.multichain.com/blog/2016/09/introducing-multichain-streams/could you please give me an idea of how to go about implementing smart contract with s …
  • How to use blockchain to record data related to an IoT network May 5, 2018
    Hi multichain team, My project's layout: I got a number of IoT (internet of things) objects that act as weather stations and a multichain network that will hold IoT specific data. Particularly, w …
  • Why number of blocks increasing automatically ? And is any config to stop it ? May 5, 2018
    Hi, I got a same problem as this question : https://www.multichain.com/qa/2310/increase-of-block-made-by-blockchain But I still don't know about mechanism of creating a new block in Multichain : …
  • Why do permissions allow a node to "read" streams when every node has access to this data on the blockchain? May 4, 2018