Designing the transaction processing process in a blockchain network

Develop a transaction lifecycle scheme from its creation to final confirmation.

1. The transaction is generated by an algorithm that produces an unsigned structure.
2. The transaction is considered confirmed when the blockchain returns a CONFIRMED status for its hash.
3. Note that the transaction signature is performed on the client side, not on the server.
4. Lifecycle stages: formation of an unsigned transaction → signing → sending to the blockchain → receiving confirmation.