Is it possible to store data about arbitrary objects on the blockchain using smart contracts

+1 vote

 And if not what are the ways to use Blockchain to achieve it. (I did some research, and people are using Blockchain in SCM industry. They must have stored these kind of datas).

Mar 25, 2018 in Blockchain by aryya
• 7,440 points

recategorized Aug 30, 2018 by Omkar 639 views

3 answers to this question.

+2 votes
Best answer

Consider following tutorial from Hyperledger Fabric "Getting Started" pages.

Basically you implement requested logic on by leveraging chaincodes, you will have to implement following golang interface:

// Chaincode interface must be implemented by all chaincodes. The fabric runs
// the transactions by calling these functions as specified.
type Chaincode interface {
    // Init is called during Instantiate transaction after the chaincode container
    // has been established for the first time, allowing the chaincode to
    // initialize its internal data
    Init(stub ChaincodeStubInterface) pb.Response

    // Invoke is called to update or query the ledger in a proposal transaction.
    // Updated state variables are not committed to the ledger until the
    // transaction is committed.
    Invoke(stub ChaincodeStubInterface) pb.Response
}

For example something similar to this:

type myStoreChaincode struct {
}

func (cc *myStoreChaincode) Init(stub ChaincodeStubInterface) pb.Response {
    return shim.Success(nil)
}

func (cc *myStoreChaincode) Invoke(stub ChaincodeStubInterface) pb.Response {
    action, params = stub.GetFunctionAndParameters()
    if action == "storeItem" {
        cc.StoreItem(stub, params)
    }

    // Handle here other cases and possible parameters combinations
    return shim.Success(nil)
}

func (cc *myStoreChaincode) StoreItem(stub ChaincodeStubInterface, params []string) {
      // Store item on ledger, where params[0] is a key and params[1] actual value
      stub.PutState(params[0], params[1])
}

This is only a simplified version, while for more complex you can follow "Writing Your Application" tutorial.

answered Aug 30, 2018 by Artem

selected Aug 30, 2018 by Omkar
0 votes
yeah it's very much possible to store information relating to any arbitrary object on the blockchain using smart contracts. Good examples would include ethereum smart contracts and hyperledger fabric smart contracts
answered Mar 25, 2018 by charlie_brown
• 7,710 points
0 votes

Yes, you can store what you want using contracts but you have to take care of the encryption.

answered Aug 30, 2018 by Kuro

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