diff --git a/Cargo.toml b/Cargo.toml
index c59930b5..224dd216 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -122,6 +122,7 @@ wasm-bindgen-test = "0.3.36"
 
 [build-dependencies]
 anyhow = "1.0.71"
+blake3 = "1.4.1"
 rgb-std = { version = "0.10.2" }
 serde = "1.0.164"
 toml = { version = "0.7.5", features = ["preserve_order"] }
diff --git a/build.rs b/build.rs
index e89c2692..9922d497 100644
--- a/build.rs
+++ b/build.rs
@@ -30,7 +30,22 @@ const LIB_ID_RGB_CONTRACT_COMMENT: &str =
 const LIB_ID_RGB_STD_COMMENT: &str =
     "[LIB_ID_RGB_STD]\n# Not consensus-breaking: If changed, only stash and consignments must be updated. No reiussance or migration necessary.";
 
+type HashNameMap = BTreeMap<String, String>;
+
+#[allow(non_snake_case)]
+#[derive(Deserialize, Serialize)]
+struct FileHashes {
+    ASSETS_STOCK: HashNameMap,
+    ASSETS_WALLETS: HashNameMap,
+}
+
+const FILE_HASHES_FILE: &str = "file_hashes.toml";
+const ASSETS_STOCK: &str = "bitmask-fungible_assets_stock.c15";
+const ASSETS_WALLETS: &str = "bitmask-fungible_assets_wallets.c15";
+const NETWORK: &str = "bitcoin"; // Only mainnet is tracked, no monetary incentive to upgrade testnet assets
+
 fn main() -> Result<()> {
+    // lib ids
     const BMC_VERSION: &str = env!("CARGO_PKG_VERSION");
 
     let toml = fs::read_to_string(LIB_IDS_FILE)?;
@@ -67,5 +82,31 @@ fn main() -> Result<()> {
 
     fs::write(LIB_IDS_FILE, format!("{FILE_COMMENT}{toml}"))?;
 
+    // file hashes
+    let toml = fs::read_to_string(FILE_HASHES_FILE)?;
+    let mut doc: FileHashes = toml::from_str(&toml)?;
+
+    let assets_stock_name = format!("{NETWORK}-{LIB_ID_RGB}-{ASSETS_STOCK}");
+    let assets_wallets_name = format!("{NETWORK}-{LIB_ID_RGB}-{ASSETS_WALLETS}");
+
+    let assets_stock_hash = blake3::hash(assets_stock_name.as_bytes())
+        .to_hex()
+        .to_ascii_lowercase();
+    let assets_wallets_hash = blake3::hash(assets_wallets_name.as_bytes())
+        .to_hex()
+        .to_ascii_lowercase();
+
+    doc.ASSETS_STOCK
+        .entry(assets_stock_hash)
+        .or_insert(assets_stock_name);
+
+    doc.ASSETS_WALLETS
+        .entry(assets_wallets_hash)
+        .or_insert(assets_wallets_name);
+
+    let toml = toml::to_string(&doc)?;
+
+    fs::write(FILE_HASHES_FILE, toml)?;
+
     Ok(())
 }
diff --git a/file_hashes.toml b/file_hashes.toml
new file mode 100644
index 00000000..9fe904a9
--- /dev/null
+++ b/file_hashes.toml
@@ -0,0 +1,5 @@
+[ASSETS_STOCK]
+7e9bb3bc108f2c3a3dc459f44a394db9e4071f0d61de07ece77f6145304b7630 = "bitcoin-urn:ubideco:stl:4fGZWR5mH5zZzRZ1r7CSRe776zm3hLBUngfXc4s3vm3V#saturn-flash-emerald-bitmask-fungible_assets_stock.c15"
+
+[ASSETS_WALLETS]
+09b66ce867c9b9bd8ced2a15b112a83c753be611319c06b764a445e2c490ea15 = "bitcoin-urn:ubideco:stl:4fGZWR5mH5zZzRZ1r7CSRe776zm3hLBUngfXc4s3vm3V#saturn-flash-emerald-bitmask-fungible_assets_wallets.c15"
diff --git a/src/carbonado.rs b/src/carbonado.rs
index 4a2bf8a0..15779f9e 100644
--- a/src/carbonado.rs
+++ b/src/carbonado.rs
@@ -110,9 +110,9 @@ pub async fn retrieve_metadata(sk: &str, name: &str) -> Result<FileMetadata, Car
 
     let endpoint = CARBONADO_ENDPOINT.read().await.to_string();
     let network = NETWORK.read().await.to_string();
-    let name = format!("{network}-{name}/metadata");
+    let name = format!("{network}-{name}");
     let hash = blake3::hash(name.as_bytes()).to_hex().to_ascii_lowercase();
-    let url = format!("{endpoint}/{pk}/{hash}");
+    let url = format!("{endpoint}/{pk}/{hash}/metadata");
     let client = reqwest::Client::new();
     let response = client
         .get(&url)