[Dragon 2] Sign transaction with network generation hash #151
Description
1. Sign transaction with network generation hash
An extra security layer is now added to all transactions to distinguish NIS1 and NIS2 network. It requires all transactions to be prepended with block generation hash before signing.
SignedTxPayload = Size + Signature + Signer + Specific Tx Payload
Note: Signature = account.sign(generationHash+SpecificTxPayload)
** generationHash is prepended into the transaction payload for signing but not physically included in the signedTransactionPayload.
Server issue link: https://github.com/nemtech/catapult-server/issues/33