diff --git a/server/utils/common.ts b/server/utils/common.ts
index a0eb103..a10857c 100644
--- a/server/utils/common.ts
+++ b/server/utils/common.ts
@@ -88,7 +88,7 @@ const getTotalRewardByHeight= async(height) => {
       currentReward = 8;
     } else if (height <= BLOCK_ERA_3) {
       remaining_height = height - BLOCK_ERA_2;
-      coin_existence =  (16 * BLOCK_ERA_1) + (8 * BLOCK_ERA_2) + 4 * remaining_height;
+      coin_existence =  (16 * BLOCK_ERA_1) + (8 * (BLOCK_ERA_2 - BLOCK_ERA_1 )) + 4 * remaining_height;
       currentReward = 4;
     } else if (height <= BLOCK_ERA_4) {
       remaining_height = height - BLOCK_ERA_3;
@@ -296,7 +296,7 @@ const latestBlockDetails = async()=> {
       currentReward = 8;
     } else if (height <= BLOCK_ERA_3) {
       remaining_height = height - BLOCK_ERA_2;
-      coin_existence =  (16 * BLOCK_ERA_1) + (8 * BLOCK_ERA_2) + 4 * remaining_height;
+      coin_existence =  (16 * BLOCK_ERA_1) + (8 *  (BLOCK_ERA_2 - BLOCK_ERA_1 )) + 4 * remaining_height;
       currentReward = 4;
     } else if (height <= BLOCK_ERA_4) {
       remaining_height = height - BLOCK_ERA_3;
@@ -512,7 +512,7 @@ const previousBlockDetails = async() => {
       currentReward = 8;
     } else if (height <= BLOCK_ERA_3) {
       remaining_height = height - BLOCK_ERA_2;
-      coin_existence =  (16 * BLOCK_ERA_1) + (8 * BLOCK_ERA_2) + 4 * remaining_height;
+      coin_existence =  (16 * BLOCK_ERA_1) + (8 *  (BLOCK_ERA_2 - BLOCK_ERA_1 )) + 4 * remaining_height;
       currentReward = 4;
     } else if (height <= BLOCK_ERA_4) {
       remaining_height = height - BLOCK_ERA_3;