diff --git a/Cargo.toml b/Cargo.toml
index 1cffaa34..ad9c4276 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "nanos_sdk"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["yhql"]
 edition = "2021"
 
diff --git a/build.rs b/build.rs
index 60468631..038edfda 100644
--- a/build.rs
+++ b/build.rs
@@ -1,6 +1,29 @@
 use std::path::PathBuf;
 use std::{env, error::Error};
 
+fn extract_defines_from_cx_makefile(command: &mut cc::Build, makefile: &String) {
+    let mut makefile = File::open(makefile).unwrap();
+    let mut content = String::new();
+    makefile.read_to_string(&mut content).unwrap();
+    // Extract the defines from the Makefile.conf.cx.
+    // They all begin with `HAVE` and are ' ' and '\n' separated.
+    let mut defines = content
+        .split('\n')
+        .filter(|line| !line.starts_with('#')) // Remove lines that are commented
+        .flat_map(|line| line.split(' ').filter(|word| word.starts_with("HAVE")))
+        .collect::<Vec<&str>>();
+
+    // do not forget NATIVE_LITTLE_ENDIAN
+    let s = String::from("NATIVE_LITTLE_ENDIAN");
+    defines.push(s.as_str());
+
+    // Add the defines found in the Makefile.conf.cx to our build command.
+    for define in defines {
+        // scott could use for_each
+        command.define(define, None);
+    }
+}
+
 fn main() -> Result<(), Box<dyn Error>> {
     enum Device {
         NanoS,
diff --git a/link.ld b/link.ld
index 4c1ada11..7bee28e9 100644
--- a/link.ld
+++ b/link.ld
@@ -48,8 +48,6 @@ SECTIONS
     _estack = ABSOLUTE(END_STACK);
   } > SRAM
 
-  .ledger.api_level (INFO): { KEEP(*(.ledger.api_level)) }
-
   .stack_sizes (INFO):
   {
     KEEP(*(.stack_sizes));
@@ -63,6 +61,18 @@ SECTIONS
     *(.ARM.exidx* .gnu.linkonce.armexidx.*)
     *(.debug_info)
   }
+
+  ledger.target (INFO): { KEEP(*(ledger.target)) }
+  ledger.target_id (INFO): { KEEP(*(ledger.target_id)) }
+  ledger.target_name (INFO): { KEEP(*(ledger.target_name)) }
+  ledger.app_name (INFO): { KEEP(*(ledger.app_name)) }
+  ledger.app_version (INFO): { KEEP(*(ledger.app_version)) }
+  ledger.api_level (INFO): { KEEP(*(ledger.api_level)) }
+  ledger.sdk_version (INFO): { KEEP(*(ledger.sdk_version)) }
+  ledger.rust_sdk_version (INFO): { KEEP(*(ledger.rust_sdk_version)) }
+  ledger.rust_sdk_name (INFO): { KEEP(*(ledger.rust_sdk_name)) }
+  ledger.sdk_name (INFO): { KEEP(*(ledger.sdk_name)) }
+  ledger.sdk_hash (INFO): { KEEP(*(ledger.sdk_hash)) }
 }
 
 PROVIDE(_nvram = ABSOLUTE(_nvram_start));
diff --git a/src/infos.rs b/src/infos.rs
index 2b5d9529..5e5d4434 100644
--- a/src/infos.rs
+++ b/src/infos.rs
@@ -1,5 +1,25 @@
-/// Expose the API_LEVEL
-#[link_section = ".ledger.api_level"]
+const MAX_METADATA_STRING_SIZE: usize = 32;
+
+const fn copy_str_to_u8_array(input: &str) -> [u8; MAX_METADATA_STRING_SIZE] {
+    let mut result = [0u8; MAX_METADATA_STRING_SIZE];
+    let bytes = input.as_bytes();
+    let mut count = 0u32;
+
+    // Ensure we don't copy more than MAX_METADATA_STRING_SIZE
+    let min_length = core::cmp::min(bytes.len(), MAX_METADATA_STRING_SIZE - 1);
+    // Copy bytes to array
+    loop {
+        if count >= min_length as u32 {
+            result[count as usize] = '\n' as u8;
+            break;
+        }
+        result[count as usize] = bytes[count as usize];
+        count += 1;
+    }
+    result
+}
+
+/// Expose the API_LEVEL to the app
 #[used]
 static API_LEVEL: u8 = if cfg!(target_os = "nanos") {
     0
@@ -10,3 +30,73 @@ static API_LEVEL: u8 = if cfg!(target_os = "nanos") {
 } else {
     0xff
 };
+
+#[used]
+#[link_section = "ledger.api_level"]
+static ELF_API_LEVEL: [u8; 4] = if cfg!(target_os = "nanos") {
+    *b"0\n\0\0"
+} else if cfg!(target_os = "nanox") {
+    *b"5\n\0\0"
+} else if cfg!(target_os = "nanosplus") {
+    *b"1\n\0\0"
+} else {
+    *b"255\n"
+};
+
+#[used]
+#[link_section = "ledger.target"]
+static ELF_TARGET: [u8; 8] = if cfg!(target_os = "nanos") {
+    *b"nanos\n\0\0"
+} else if cfg!(target_os = "nanox") {
+    *b"nanox\n\0\0"
+} else if cfg!(target_os = "nanosplus") {
+    *b"nanos2\n\0"
+} else {
+    *b"unknown\n"
+};
+
+#[used]
+#[link_section = "ledger.target_id"]
+static ELF_TARGET_ID: [u8; 11] = if cfg!(target_os = "nanos") {
+    *b"0x31100004\n"
+} else if cfg!(target_os = "nanox") {
+    *b"0x33000004\n"
+} else if cfg!(target_os = "nanosplus") {
+    *b"0x33100004\n"
+} else {
+    *b"0xffffffff\n"
+};
+
+#[used]
+#[link_section = "ledger.target_name"]
+static ELF_TARGET_NAME: [u8; 14] = if cfg!(target_os = "nanos") {
+    *b"TARGET_NANOS\n\0"
+} else if cfg!(target_os = "nanox") {
+    *b"TARGET_NANOX\n\0"
+} else if cfg!(target_os = "nanosplus") {
+    *b"TARGET_NANOS2\n"
+} else {
+    *b"WRONG_TARGET\n\0"
+};
+
+#[used]
+#[link_section = "ledger.sdk_hash"]
+static ELF_SDK_HASH: [u8; 5] = *b"None\n";
+
+#[used]
+#[link_section = "ledger.sdk_name"]
+static ELF_SDK_NAME: [u8; 18] = *b"ledger-secure-sdk\n";
+
+#[used]
+#[link_section = "ledger.sdk_version"]
+static ELF_SDK_VERSION: [u8; 5] = *b"None\n";
+
+#[used]
+#[link_section = "ledger.rust_sdk_name"]
+static ELF_RUST_SDK_NAME: [u8; MAX_METADATA_STRING_SIZE] =
+    copy_str_to_u8_array(env!("CARGO_PKG_NAME"));
+
+#[used]
+#[link_section = "ledger.rust_sdk_version"]
+static ELF_RUST_SDK_VERSION: [u8; MAX_METADATA_STRING_SIZE] =
+    copy_str_to_u8_array(env!("CARGO_PKG_VERSION"));
diff --git a/src/lib.rs b/src/lib.rs
index b6a86e00..8f2274e1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,6 +5,7 @@
 #![test_runner(testing::sdk_test_runner)]
 #![allow(incomplete_features)]
 #![feature(generic_const_exprs)]
+#![feature(const_cmp)]
 
 #[cfg(target_os = "nanox")]
 pub mod ble;