NewCheckpoint create a new checkpoint instance.

NewContractViewpoint returns a new empty contract view.

NewUtxoViewpoint returns a new empty unspent transaction output view.

Finalized if checkpoint c is justified and there is a sup link c→c′ where c′is a direct child of c.

Growing means that the checkpoint has not ended the current epoch.

Justified if checkpoint is the root, or there exists a super link c′ → c where c′ is justified.

Unjustified means thant the checkpoint has ended the current epoch, but not been justified.

BlockStoreState represents the core's db status.

Checkpoint represent the block/hash under consideration for finality for a given epoch.

ContractViewpoint represents a view into the set of registered contract.

UtxoViewpoint represents a view into the set of unspent transaction outputs.

Validator represent the participants of the PoS network Responsible for block generation and verification.

Store provides storage interface for blockchain data.

CheckpointStatus represent current status of checkpoint.