diff --git a/rust/immutable-ledger/src/cddl/block.cddl b/rust/immutable-ledger/src/cddl/block.cddl
deleted file mode 100644
index f380b6a02..000000000
--- a/rust/immutable-ledger/src/cddl/block.cddl
+++ /dev/null
@@ -1,33 +0,0 @@
-block = [
-    block_header,
-    block_data: metadata,
-    validator_signature:metadata,
-]
-
-block_header = [
-    chain_id: ULID,
-    height: int,
-    timestamp: #6.1(uint .ge 1722470400), ; Epoch-based date/time
-    prev_block_id: hash_bytes, ; hash of the previous block
-    ledger_type: UUID,
-    purpose_id: ULID / UUID,
-    validator: validator,
-    metadata: metadata,
-]
-
-ULID = #6.32780(bytes) ; ULID type
-UUID = #6.37(bytes) ; UUID type
-
-BLAKE_3 = #6.32781(bytes) ; Blake3 hash
-BLAKE_2B = #6.32782(bytes) ; Blake2b hash
-BLAKE_2S = #6.32783(bytes) ; Blake2s hash
-
-hash_bytes = BLAKE_2B / BLAKE_3 / BLAKE_2S
-
-kid = hash_bytes ; hash of the x509/c509 certificate
-
-validator = (kid / [2* kid])
-
-metadata = [ *any ]
-
-validator_signature = (bytes / [2* bytes])
diff --git a/rust/immutable-ledger/src/serialize.rs b/rust/immutable-ledger/src/serialize.rs
index 069033adc..1b4262738 100644
--- a/rust/immutable-ledger/src/serialize.rs
+++ b/rust/immutable-ledger/src/serialize.rs
@@ -706,10 +706,6 @@ mod tests {
 
         let encoded_block = block.to_bytes().unwrap();
 
-        const CDDL: &str = include_str!("./cddl/block.cddl");
-
-        cddl::validate_cbor_from_slice(CDDL, &encoded_block, None).unwrap();
-
         let (block_header, block_data, sigs) = Block::from_bytes(&encoded_block, &Blake2b).unwrap();
 
         assert_eq!(block_header, block_hdr);