parity poa

1. Proof-of-Authority-Chains
2. Demo-PoA-tutorial
3. keorn/parity-poa-tutorial
4. Docker
5. Aura
6. It does not depend on nodes solving arbitrarily difficult mathematical problems, but instead uses a set of 「authorities」 - nodes that are explicitly allowed to create new blocks and secure the blockchain. The chain has to be signed off by the majority of authorities, in which case it becomes a part of the permanent record. This makes it easier to maintain a private chain and keep the block issuers accountable.
7. Aura consensus
8. Setting up a Proof of Authority network
1. Pick real world entities that should control the network, so called authorities.
2. Each authority should run a Parity node and create an account
3. Authorities should exchange their account addresses and place them in the spec or validator contract
4. All authority nodes should run an instance Parity with the agreed on specification
5. Additional user nodes can connect to the network as well
6. Use the network just as a public Ethereum network (transactions, contracts etc.)
9. Running the authority nodes
1. --chain, consensus Engine
2. --engine-signer, an account address (0xADDRESS) listed in the engine configuration under authorities
3. --password
4. Parity has a separate directory for each chain, so make sure that the account is visible on the specified chain (create an account with --chain, import the keys or use --keys-path)
5. To make the transactions free, authority nodes can run with --usd-per-tx 0
10. RPC/UI/parity account new三種方式創建新賬戶
11. 三種console
1. geth attach ~/Library/Application Support/io.parity.ethereum/jsonrpc.ipc, geth attach localhost:8545
2. npm install web3
3. open the UI, go to Applications and open the Parity/Web3 Console
12. https://github.com/ethereum/wiki/wiki/JavaScript-API#web3
13. web3

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