Add dispute structs (#23)

* Add dispute  structs

* Replace judgmentSignatureSize with Ed25519SignatureSize

internal/block/block.go

@@ -9,4 +9,5 @@ type Block struct {
 // Extrinsic represents the block extrinsic data
 type Extrinsic struct {
 	ET []*TicketProof
+	ED *DisputeExtrinsic
 }

internal/block/dispute.go

@@ -0,0 +1,37 @@
+package block
+
+import (
+	"github.com/eigerco/strawberry/internal/crypto"
+)
+
+type DisputeExtrinsic struct {
+	Verdicts []Verdict
+	Culprits []Culprit
+	Faults   []Fault
+}
+
+type Verdict struct {
+	ReportHash crypto.Hash // H, hash of the work report
+	EpochIndex uint32      // ⌊τ/E⌋ - N2, epoch index
+	Judgments  []Judgment  // ⟦{⊺,⊥},NV,E⟧⌊2/3V⌋+1
+}
+
+type Culprit struct {
+	ReportHash                crypto.Hash                       // H, hash of the work report
+	ValidatorEd25519PublicKey crypto.Ed25519PublicKey           // He
+	Signature                 [crypto.Ed25519SignatureSize]byte // E
+}
+
+type Fault struct {
+	ReportHash                crypto.Hash                       // H, hash of the work report
+	IsValid                   bool                              // {⊺,⊥}
+	ValidatorEd25519PublicKey crypto.Ed25519PublicKey           // He
+	Signature                 [crypto.Ed25519SignatureSize]byte // E
+}
+
+// Judgment represents a single judgment with a signature
+type Judgment struct {
+	IsValid        bool                              // v: {⊺,⊥}
+	ValidatorIndex uint16                            // i: NV
+	Signature      [crypto.Ed25519SignatureSize]byte // s: E
+}

internal/crypto/constants.go

@@ -5,6 +5,7 @@ const (
 	BandersnatchSize     = 32
 	Ed25519PublicSize    = 32
 	Ed25519PrivateSize   = 64
+	Ed25519SignatureSize = 64
 	BLSSize              = 144
 	BandersnatchRingSize = 144
 	MetadataSize         = 128