Show extra data as text if possible.

CHANGELOG.md

@@ -1,6 +1,7 @@
 dev:
   - generate error message if "validator credentials set" process fails to generate any credentials
   - allow import of accounts with null name field in their keystore
+  - show text of execution payload extra data if available
 
 1.28.0:
   - support additional mnemonic word list languages

cmd/block/info/output.go

@@ -690,7 +690,11 @@ func outputCapellaBlockExecutionPayload(ctx context.Context,
 		res.WriteString("  State root: ")
 		res.WriteString(fmt.Sprintf("%#x\n", payload.StateRoot))
 		res.WriteString("  Extra data: ")
-		res.WriteString(fmt.Sprintf("%#x\n", payload.ExtraData))
+		if utf8.Valid(payload.ExtraData) {
+			res.WriteString(fmt.Sprintf("%s\n", string(payload.ExtraData)))
+		} else {
+			res.WriteString(fmt.Sprintf("%#x\n", payload.ExtraData))
+		}
 		res.WriteString("  Logs bloom: ")
 		res.WriteString(fmt.Sprintf("%#x\n", payload.LogsBloom))
 		res.WriteString("  Transactions: ")