to use it for the whole business logic. It’s always best to have everything in once place.

to use it only for things which need the benefits of the blockchain.

it always produces the same output given the same input.

it uses equally distributed data to produce the output given a long input.

it shouldn't be possible to re-generate the input given the output.

1 Ether = 10^18 wei, 10^9 Gwei, 10^3 Finney

1 Ether = 10^19 wei, 10^13 Gwei, 10^3 Finney

1 Ether = 10^16 wei, 10^13 Gwei, 10^3 Finney

1 Ether = 10^18 wei, 10^6 Gwei, 10^6 Finney

To Protect the Public Keys by being cryptographically significant.

To Sign Transactions And To Derive an Address From.

To Generate An Address which can sign transactions.

The Public Key is for Signing Transactions, the Private Key must be given out to verify the signature.

The Private Key signs transactions, the Public Key can verify the signature.

The Private Key is to generate a Public Key. The Public Key can sign transactions, the address is here to verify the transactions.