blockchain

I installed truffle through npm with the following: sudo npm install -g truffle but when I run truffle list on the console it just gives me bash: truffle: command not found Please make sure you have the latest version of npm and node installed. I had the same issue, I updated npm and node to latest version and it worked. npm install -g truffle works. I had a similar problem. I ran npm i -g truffle and then when I tried to run truffle init I got an error: zsh: command not found: truffle . What solved it for me is to create a local node_modules with truffle installed in it, and then run that

In case of Bitcoin transaction the verification/validation involves looking at the input UTXO balance etc... But in Hyperledger the transaction (if I may) "just" carries the data (function name and data-string) for the target smart contract. Does it mean that there is no necessity of validation (apart from the syntax) of the transaction? If yes what has to checked and against what? Can anyone pls give me an example use-case? If there is no validation, then is my understanding correct that the blockchain is "just" a ledger without any verification on the transactions. If something goes wrong

Can someone explain how the immutability is implemented in Hyperledger Fabric? If we have private channel with little amount of peers, how it can be guaranteed, that one side hasn't changed data in it's ledger? In order to guarantee that no party in the channel has tampered data in its own favor you need to present sophisticated endorsement policy to include all required parties and make sure they adequately represented within endorsement policy. Hence making it obligatory for client which issues new transaction to get endorsement from all interested parties, hence ensuring that all have same

I am using IBM bluemix blockchain service to tryout some smart contract logic for my asset sharing demo. Is there anyway to query the asset modified history in hyperledger fabric network. I have checked with documentations for both fabric 0.6 and 1.0 versions, but I can find only the stub.pushState(key,value_json) and stub.getState(key) to interact width the ledger. But using stub.getState(key) , I can fetch only the latest entry of the key, but how can I fetch and display the series of changes/modification written for the same key. I have iterated through the block using {peeraddress}/Block