beacon

type Beacon interface {
	// GetLatestRound fetches the latest beacon round
	GetLatestRound(ctx context.Context) (*Round, error)

	// GetRound fetches a specific beacon round
	GetRound(ctx context.Context, round uint64) (*Round, error)

	// Start begins fetching rounds at the specified interval
	Start(ctx context.Context, interval time.Duration) error

	// Stop stops fetching rounds
	Stop() error

	// Subscribe returns a channel that receives new rounds
	Subscribe() (<-chan *Round, error)
}

type Config struct {
	// URL is the drand HTTP endpoint
	URL string

	// ChainHash is the hash of the drand chain info
	ChainHash []byte

	// PublicKey is the drand group public key
	PublicKey []byte

	// Period is the duration between rounds
	Period time.Duration
}

type Round struct {
	// Number is the round number
	Number uint64

	// Randomness is the random bytes produced by drand
	Randomness []byte

	// Signature is the threshold signature of the round
	Signature []byte

	// Timestamp is when this round was created
	Timestamp time.Time
}