blockchain

Failed to invoke successfully :: TypeError: Cannot read property 'getConnectivityState' of undefined /opt/share/hyperledger/node_modules/fabric-client/lib/EventHub.js:355 if(self._stream) state = self. stream.call.channel .getConnectivityState(); ^ TypeError: Cannot read property 'getConnectivityState' of undefined at ClientDuplexStream.<anonymous> (/opt/share/hyperledger/node_modules/fabric-client/lib/EventHub.js:355:56) at emitOne (events.js:116:13) at ClientDuplexStream.emit (events.js:211:7) at ClientDuplexStream._emitStatusIfDone (/opt/share/hyperledger/node_modules/grpc/src/client.js:236

class Block{ constructor(timestamp, transactions, previousHash = ''){ this.timestamp = timestamp; this.transactions = transactions; this.previousHash = previousHash; this.hash = this.calculateHash(); this.nonce = 0; } calculateHash(){ return SHA256(this.previousHash + JSON.stringify(this.transactions) + this.timestamp + this.nonce).toString(); } mineBlock(difficulty){ while(this.hash.substring(0, difficulty) !== Array(difficulty + 1).join("0")){ this.nonce++; this.hash = this.calculateHash(); } console.log("Block mined: " + this.hash); } } In the above code, how is it promised that the

I am actually learning smart contract programming on ethereum and I work with truffle. Right now I am making this tutorial here: https://truffleframework.com/tutorials/building-dapps-for-quorum-private-enterprise-blockchains Where you learn how to create a dapp with quorum. But now I have a problem. I did everything exactly as described, but when I do: truffle migrate I get this error here: $ truffle migrate ⚠️ Important ⚠️ If you're using an HDWalletProvider, it must be Web3 1.0 enabled or your migration will hang. Starting migrations... ====================== > Network name: 'development' >

I'm trying to install Open Transactions, the open-source project, on a debian 8. I've installed all the dependencies and am having an issue when compiling (make). The following error is showing at my terminal, even though i made sure to install the protobuf project: In file included from /root/opentxs/src/../include/opentxs/core/OTStoragePB.hpp:64:0, from /root/opentxs/src/core/OTStorage.cpp:47: /root/opentxs/build/src/core/otprotob/Generics.pb.h:501:6: error: "PROTOBUF_INLINE_NOT_IN_HEADERS" is not defined [-Werror=undef] #if !PROTOBUF_INLINE_NOT_IN_HEADERS ^ In file included from /root

I need to run Hyperledger-Fabric instances on 4 different machines PC-1 should contain CA and peers of ORG-1 in containers, Pc-2 should contain CA and peers of ORG-2, PC-3 should contain orderer(solo) and PC-4 should Node api Is my approach missing something ? if not how can I achieve this? I would recommend that you look at the Ansible driver in Hyperledger Cello project to manage deployment across multiple hosts/vms. In short, you need to establish network visibility across the set of host/vm nodes such that the peer knows about the orderer to which it will connect and so that gossip can

Im trying to use a ticker in my chaincode to update the chaincode state periodically, based on some condition: func (t *SimpleChaincode) Invoke(stub *shim.ChaincodeStub, function string, args []string) ([]byte, error) { ticker := time.NewTicker(time.Millisecond * 10000) go func() { for t := range ticker.C { fmt.Println("Tick at", t) a = a+5 err:= stub.PutState("a", []byte(strconv.Itoa(a))) fmt.Println(err.Error()) } }() return nil, nil } I am sending the invoke transaction using the chaincode REST api for invoke : POST http://<ip>:<port>/chaincode { "jsonrpc": "2.0", "method": "invoke",

If a chaincode A stores a variable V to the World State can this variable V be accessed by another chaincode B? In other words, are variables in the World State access protected? If it is not possible, how can I make chaincode B read the variables from chaincode A (I need it for my use case)? No, variables stored by some chaincode A can only be accessed by the same chaincode A. So if a chaincode B tries to access the variable V, access will be denied. If you wanted to access such variables (because your use case requires interconnection between chaincodes) you can invoke/query chaincode A from