diff --git a/cmd/lotus-shed/blockmsgid.go b/cmd/lotus-shed/blockmsgid.go
new file mode 100644
index 000000000..85b786ec0
--- /dev/null
+++ b/cmd/lotus-shed/blockmsgid.go
@@ -0,0 +1,70 @@
+package main
+
+import (
+	"encoding/base64"
+	"fmt"
+
+	blake2b "github.com/minio/blake2b-simd"
+	"github.com/urfave/cli/v2"
+
+	"github.com/ipfs/go-cid"
+
+	"github.com/filecoin-project/lotus/chain/types"
+	lcli "github.com/filecoin-project/lotus/cli"
+)
+
+var blockmsgidCmd = &cli.Command{
+	Name:      "blockmsgid",
+	Usage:     "Print a block's pubsub message ID",
+	ArgsUsage: "<blockCid> ...",
+	Action: func(cctx *cli.Context) error {
+		api, closer, err := lcli.GetFullNodeAPI(cctx)
+		if err != nil {
+			return err
+		}
+
+		defer closer()
+		ctx := lcli.ReqContext(cctx)
+
+		for _, arg := range cctx.Args().Slice() {
+			blkcid, err := cid.Decode(arg)
+			if err != nil {
+				return fmt.Errorf("error decoding block cid: %w", err)
+			}
+
+			blkhdr, err := api.ChainGetBlock(ctx, blkcid)
+			if err != nil {
+				return fmt.Errorf("error retrieving block header: %w", err)
+			}
+
+			blkmsgs, err := api.ChainGetBlockMessages(ctx, blkcid)
+			if err != nil {
+				return fmt.Errorf("error retrieving block messages: %w", err)
+			}
+
+			blkmsg := &types.BlockMsg{
+				Header: blkhdr,
+			}
+
+			for _, m := range blkmsgs.BlsMessages {
+				blkmsg.BlsMessages = append(blkmsg.BlsMessages, m.Cid())
+			}
+
+			for _, m := range blkmsgs.SecpkMessages {
+				blkmsg.SecpkMessages = append(blkmsg.SecpkMessages, m.Cid())
+			}
+
+			bytes, err := blkmsg.Serialize()
+			if err != nil {
+				return fmt.Errorf("error serializing BlockMsg: %w", err)
+			}
+
+			msgId := blake2b.Sum256(bytes)
+			msgId64 := base64.StdEncoding.EncodeToString(msgId[:])
+
+			fmt.Println(msgId64)
+		}
+
+		return nil
+	},
+}
diff --git a/cmd/lotus-shed/main.go b/cmd/lotus-shed/main.go
index 19067f8c9..10b2b4d89 100644
--- a/cmd/lotus-shed/main.go
+++ b/cmd/lotus-shed/main.go
@@ -50,6 +50,7 @@ func main() {
 		electionCmd,
 		rpcCmd,
 		cidCmd,
+		blockmsgidCmd,
 	}
 
 	app := &cli.App{