A chaincode package that was signed at creation can be handed over to other owners for inspection and signing. The workflow supports out-of-band signing of chaincode package.

Reference: http://hyperledger-fabric.readthedocs.io/en/release-1.1/chaincode4noah.html

BFT is notably implemented by Ripple (where validators are pre-selected by the Ripple foundation) and Stellar (where anyone can be a validator and trust is established by the community). BFT is advantageous because it presents scalability and low cost transactions, but like DPoS introduces a component of centralization.

Reference: https://hackernoon.com/an-overview-of-cryptocurrency-consensus-algorithms-9d744289378f

Reference: https://www.horsesforsources.com/top-5-blockchain-platforms_031618

Gas is supposed to be the constant cost of network resources/utilization. You want the real cost of sending a transaction to always be the same, so you can't really expect Gas to be issued, currencies in general are volatile. So instead, we issue ether whose value is supposed to vary, but also implement a Gas Price in terms of Ether. If the price of ether goes up, the Gas Price in terms of ether should go down to keep the real cost of Gas the same. Reference: http://ethdocs.org/ en/latest/ether.html

If you really need a native currency for your chain network, you can develop your own native currency with chaincode. One common attribute of native currency is that some amount will get transacted (the chaincode defining that currency will get called) every time a transaction is processed on its chain.

Reference: http://hyperledger-fabric.readthedocs.io/en/release-1.1/Fabric-FAQ.html#endorsement

True You can interact with the blockchain using RPC via HTTP POST requests. You can find out more about the JSON-RPC API here. Although you can use RPC to communicate with a local node you can also use it to hook up with a remote node. To send requests to the local node we address them to http://127.0.0.1:8545 (Geth exposes the RPC service on port 8545).

Reference: https://datawookie.netlify.com/blog/2018/01/ethereum-running-a-node/

Ripple is a real-time gross settlement system (RTGS), currency exchange and remittance network by Ripple. Reference: https://ripple.com/

The main disadvantages are huge expenditures, "uselessness" of computations and 51 percent attack. Reference: https://cointelegraph.com/explained/proof-of- work-explained