diff --git a/src/Transactions/types.ts b/src/Transactions/types.ts
index 45478a2f..06602abd 100644
--- a/src/Transactions/types.ts
+++ b/src/Transactions/types.ts
@@ -14,6 +14,7 @@ export interface TransactionFrag {
     outputs: TransOutputFrag[]; // technically a TransactionOutput fragment
     txIndex: number;
     withdrawals: TransOutputFrag[];
+    certificates: Certificate[];
 }
 export interface BlockFrag {
     number: number;
@@ -32,3 +33,59 @@ export interface TransOutputFrag {
     address: string;
     amount: string;
 }
+
+export type Certificate = StakeRegistration | StakeDeregistration | StakeDelegation | PoolRegistration | PoolRetirement | MoveInstantaneousRewardsCert;
+
+export interface StakeRegistration {
+  kind: "StakeRegistration";
+  stakeCredential: string;
+}
+export interface StakeDeregistration{
+  kind: "StakeDeregistration";
+  stakeCredential: string;
+}
+export interface StakeDelegation{
+  kind: "StakeDelegation";
+  stakeCredential: string;
+  poolKeyHash: string;
+}
+export interface PoolRegistration{
+  kind: "PoolRegistration";
+  poolParams: PoolParams;
+}
+export interface PoolRetirement{
+  kind: "PoolRetirement";
+  poolKeyHash: string;
+  epoch: number;
+  
+}
+export interface MoveInstantaneousRewardsCert{
+  kind: "MoveInstantaneousRewardsCert";
+  pot: "Reserve" | "Treasury";
+  rewards: string[];
+}
+
+export interface PoolParams {
+    operator: string;
+    vrfKeyHash: string
+    pledge: string;
+    cost: string;
+    margin: number;
+    rewardAccount: string;
+    poolOwners: string[];
+    relays: PoolRelay[];
+    poolMetadata: null | PoolMetadata;
+}
+
+export interface PoolMetadata {
+    url: string;
+    metadataHash: string;
+}
+
+export interface PoolRelay {
+    ipv4: string;
+    ipv6: string;
+    dnsName: string;
+    dnsSrvName: string
+    port: string;
+}