Tech: claim node registration - transaction's business logic for 'claim node registration' transaction type

[iltoga]

Description

Implement service layer for claim node registration's transaction type, as described in https://docs.google.com/document/d/118CdR0WOIpZx4C9Hnx-JsrHz3vXn9OZ6eMokk9y71hk/edit#bookmark=id.nw9gxr2k51oa

Breakdown

• Create new file transaction/claimNodeRegistration.go and create struct containing the attachment body (see Tech: node registration - schema: grpc service methods and attachment for node registration processes #82) and other tx fields necessary to validate the transaction
• Add business logic for ApplyConfirmed, ApplyUnconfirmed, Validate methods and write tests on the way

Additional Diagram / File

Reference

#68 #82