diff --git a/src/client/lcd/api/IbcAPI.ts b/src/client/lcd/api/IbcAPI.ts
index c64176c..55fa60c 100644
--- a/src/client/lcd/api/IbcAPI.ts
+++ b/src/client/lcd/api/IbcAPI.ts
@@ -229,4 +229,32 @@ export class IbcAPI extends BaseAPI {
         d.pagination,
       ]);
   }
+
+  public async unreceivedPackets(
+    portId: string,
+    channelId: string,
+    sequences: number[],
+    params: APIParams = {}
+  ): Promise<{ sequences: string[]; height: Height }> {
+    return this.c.get<{ sequences: string[]; height: Height }>(
+      `/ibc/core/channel/v1/channels/${channelId}/ports/${portId}/packet_commitments/${sequences.join(
+        ','
+      )}/unreceived_packets`,
+      params
+    );
+  }
+
+  public async unreceivedAcks(
+    portId: string,
+    channelId: string,
+    sequences: number[],
+    params: APIParams = {}
+  ): Promise<{ sequences: string[]; height: Height }> {
+    return this.c.get<{ sequences: string[]; height: Height }>(
+      `/ibc/core/channel/v1/channels/${channelId}/ports/${portId}/packet_commitments/${sequences.join(
+        ','
+      )}/unreceived_acks`,
+      params
+    );
+  }
 }
diff --git a/src/core/Block.ts b/src/core/Block.ts
index fe0e606..0bb8c70 100644
--- a/src/core/Block.ts
+++ b/src/core/Block.ts
@@ -60,7 +60,7 @@ export interface LastCommit {
 }
 
 export interface Signature {
-  block_id_flag: number;
+  block_id_flag: string;
   validator_address: string;
   timestamp: string;
   signature: string;
diff --git a/src/core/ibc/core/channel/Packet.ts b/src/core/ibc/core/channel/Packet.ts
index b2dc5cf..ff8fb6e 100644
--- a/src/core/ibc/core/channel/Packet.ts
+++ b/src/core/ibc/core/channel/Packet.ts
@@ -21,7 +21,7 @@ export class Packet extends JSONSerializable<
     public destination_channel: string,
     public data: string,
     public timeout_height: Height | undefined,
-    public timeout_timestamp: number
+    public timeout_timestamp: string
   ) {
     super();
   }
@@ -92,7 +92,7 @@ export class Packet extends JSONSerializable<
       destination_channel,
       data,
       timeout_height ? Height.fromData(timeout_height) : undefined,
-      Number.parseInt(timeout_timestamp)
+      timeout_timestamp
     );
   }
 
@@ -115,7 +115,7 @@ export class Packet extends JSONSerializable<
       destination_channel,
       data,
       timeout_height: timeout_height?.toData(),
-      timeout_timestamp: timeout_timestamp.toFixed(),
+      timeout_timestamp: timeout_timestamp,
     };
     return res;
   }
@@ -129,7 +129,7 @@ export class Packet extends JSONSerializable<
       proto.destinationChannel,
       Buffer.from(proto.data).toString('base64'),
       proto.timeoutHeight ? Height.fromProto(proto.timeoutHeight) : undefined,
-      proto.timeoutTimestamp.toNumber()
+      proto.timeoutTimestamp.toString()
     );
   }
 
@@ -152,7 +152,7 @@ export class Packet extends JSONSerializable<
       destinationChannel: destination_channel,
       data: Buffer.from(data, 'base64'),
       timeoutHeight: timeout_height?.toProto(),
-      timeoutTimestamp: Long.fromNumber(timeout_timestamp),
+      timeoutTimestamp: Long.fromString(timeout_timestamp),
     });
   }
 }
@@ -166,7 +166,7 @@ export namespace Packet {
     destination_channel: string;
     data: string;
     timeout_height?: Height.Amino;
-    timeout_timestamp: number;
+    timeout_timestamp: string;
   }
 
   export interface Data {
diff --git a/src/core/ibc/core/client/msgs/tendermint/types.ts b/src/core/ibc/core/client/msgs/tendermint/types.ts
index 2b92f83..bb63e79 100644
--- a/src/core/ibc/core/client/msgs/tendermint/types.ts
+++ b/src/core/ibc/core/client/msgs/tendermint/types.ts
@@ -154,7 +154,7 @@ export class Header extends JSONSerializable<any, Header.Data, Header.Proto> {
       Buffer.from(appHash).toString('base64'),
       Buffer.from(lastResultsHash).toString('base64'),
       Buffer.from(evidenceHash).toString('base64'),
-      proposerAddress.toString()
+      Buffer.from(proposerAddress).toString('base64')
     );
   }
 
@@ -189,7 +189,7 @@ export class Header extends JSONSerializable<any, Header.Data, Header.Proto> {
       appHash: Buffer.from(appHash, 'base64'),
       lastResultsHash: Buffer.from(lastResultsHash, 'base64'),
       evidenceHash: Buffer.from(evidenceHash, 'base64'),
-      proposerAddress: Buffer.from(proposerAddress),
+      proposerAddress: Buffer.from(proposerAddress, 'base64'),
     });
   }
 }