diff --git a/crates/tx3-resolver/src/trp/spec.rs b/crates/tx3-resolver/src/trp/spec.rs
index 872d9783..4f519936 100644
--- a/crates/tx3-resolver/src/trp/spec.rs
+++ b/crates/tx3-resolver/src/trp/spec.rs
@@ -5,19 +5,26 @@ use crate::interop::{BytesEncoding, BytesEnvelope};
 
 pub type JsonArgMap = serde_json::Map<String, serde_json::Value>;
 
-#[derive(Debug, Deserialize, Serialize, Clone)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct TirEnvelope {
     pub content: String,
     pub encoding: BytesEncoding,
     pub version: String,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum WitnessInput {
+    Object(SubmitWitness),
+    Hex(String),
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct SubmitParams {
     #[serde(rename = "tx")]
     pub tx: BytesEnvelope,
     #[serde(rename = "witnesses")]
-    pub witnesses: Vec<SubmitWitness>,
+    pub witnesses: Vec<WitnessInput>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -64,6 +71,8 @@ pub struct InputQueryDiagnostic {
 pub struct ResolveParams {
     #[serde(rename = "args")]
     pub args: JsonArgMap,
+    #[serde(rename = "env")]
+    pub env: JsonArgMap,
     #[serde(rename = "tir")]
     pub tir: TirEnvelope,
 }
diff --git a/specs/v1beta0/trp.json b/specs/v1beta0/trp.json
index 867f0593..a3b79e28 100644
--- a/specs/v1beta0/trp.json
+++ b/specs/v1beta0/trp.json
@@ -282,6 +282,19 @@
           "logs"
         ]
       },
+      "WitnessInput": {
+        "title": "WitnessInput",
+        "oneOf": [
+          {
+            "$ref": "#/components/schemas/SubmitWitness",
+            "title": "Object"
+          },
+          {
+            "type": "string",
+            "title": "Hex"
+          }
+        ]
+      },
       "SubmitParams": {
         "title": "SubmitParams",
         "type": "object",
@@ -292,7 +305,7 @@
           "witnesses": {
             "type": "array",
             "items": {
-              "$ref": "#/components/schemas/SubmitWitness"
+              "$ref": "#/components/schemas/WitnessInput"
             }
           }
         },