diff --git a/package.json b/package.json
index 460a440..fec932d 100644
--- a/package.json
+++ b/package.json
@@ -94,7 +94,7 @@
     "ethereumjs-util": "6.0.0",
     "fork-ts-checker-webpack-plugin": "^0.4.15",
     "jsbi-utils": "^1.0.0",
-    "leap-core": "0.38.0",
+    "leap-core": "2.0.0",
     "mobx": "^5.0.3",
     "mobx-react": "^5.2.3",
     "prop-types": "^15.6.1",
diff --git a/src/stores/unspents.ts b/src/stores/unspents.ts
index 95cc712..e8303bd 100644
--- a/src/stores/unspents.ts
+++ b/src/stores/unspents.ts
@@ -129,15 +129,10 @@ export class UnspentsStore {
       });
   }
 
-  private exitDeposit(
-    unspentDeposit: UnspentWithTx,
-    fallbackPeriodData: PeriodData
-  ) {
-    return getProof(
-      web3PlasmaStore.instance,
-      unspentDeposit.transaction,
-      fallbackPeriodData
-    ).then(txProof =>
+  private exitDeposit(unspentDeposit: UnspentWithTx) {
+    return getProof(web3PlasmaStore.instance, unspentDeposit.transaction, {
+      excludePrevHashFromProof: true,
+    }).then(txProof =>
       exitHandlerStore.startExit([], txProof, unspentDeposit.outpoint.index, 0)
     );
   }
@@ -146,23 +141,19 @@ export class UnspentsStore {
   public exitUnspent(unspent: UnspentWithTx) {
     const tx = Tx.fromRaw(unspent.transaction.raw);
 
-    const { signer } = operatorStore.slots[0];
-
-    const fallbackPeriodData = { slotId: 0, validatorAddress: signer };
-
     if (tx.type === Type.DEPOSIT) {
-      return this.exitDeposit(unspent, fallbackPeriodData);
+      return this.exitDeposit(unspent);
     }
 
     getYoungestInputTx(web3PlasmaStore.instance, tx)
       .then(inputTx =>
         Promise.all([
-          getProof(
-            web3PlasmaStore.instance,
-            unspent.transaction,
-            fallbackPeriodData
-          ),
-          getProof(web3PlasmaStore.instance, inputTx.tx, fallbackPeriodData),
+          getProof(web3PlasmaStore.instance, unspent.transaction, {
+            excludePrevHashFromProof: true,
+          }),
+          getProof(web3PlasmaStore.instance, inputTx.tx, {
+            excludePrevHashFromProof: true,
+          }),
           inputTx.index,
         ])
       )
@@ -207,7 +198,6 @@ export class UnspentsStore {
   @autobind
   private finalizeFastExit(exit) {
     console.log('Finalizing fast exit', exit, operatorStore.slots);
-    const { signer } = operatorStore.slots[0];
     const { unspent, sig, rawTx, sigHashBuff } = exit;
     const vBuff = Buffer.alloc(32);
     vBuff.writeInt8(sig.v, 31);
@@ -220,8 +210,12 @@ export class UnspentsStore {
       ])
     );
     return Promise.all([
-      getProof(web3PlasmaStore.instance, rawTx),
-      getProof(web3PlasmaStore.instance, unspent.transaction),
+      getProof(web3PlasmaStore.instance, rawTx, {
+        excludePrevHashFromProof: true,
+      }),
+      getProof(web3PlasmaStore.instance, unspent.transaction, {
+        excludePrevHashFromProof: true,
+      }),
       0,
     ]).then(([txProof, inputProof, inputIndex]) => {
       // call api
diff --git a/yarn.lock b/yarn.lock
index d70da3c..22979c2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3660,6 +3660,11 @@ eventemitter3@1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/eventemitter3/-/eventemitter3-1.1.1.tgz#47786bdaa087caf7b1b75e73abc5c7d540158cd0"
 
+eventemitter3@3.1.2:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/eventemitter3/-/eventemitter3-3.1.2.tgz#2d3d48f9c346698fce83a85d7d664e98535df6e7"
+  integrity sha512-tvtQIeLVHjDkJYnzf2dgVMxfuSGJeM/7UCG17TT4EumTfNtF+0nebF/4zWOIkCreAbtNqhGEboB6BWrwqNaw4Q==
+
 eventemitter3@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/eventemitter3/-/eventemitter3-3.1.0.tgz#090b4d6cdbd645ed10bf750d4b5407942d7ba163"
@@ -5108,15 +5113,16 @@ lcid@^2.0.0:
   dependencies:
     invert-kv "^2.0.0"
 
-leap-core@0.38.0:
-  version "0.38.0"
-  resolved "https://registry.yarnpkg.com/leap-core/-/leap-core-0.38.0.tgz#808ddff55bb5189771e0fbc2a086210529a17b4f"
-  integrity sha512-mjS3UOiJp05wRKRsURI1u8XzZ/4HmScpj3cpAGRC9ls4QShu/XAf2CpK297PWAfHT+xQTLyd3OxBNujhuTXamA==
+leap-core@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/leap-core/-/leap-core-2.0.0.tgz#e0ce5000bf77afd72f5a72236d6b80e82e8d3f19"
+  integrity sha512-DqbWSrYNz+ZGIROXfT7SBUC0FHon6rrv6I7RCrxbzqjDsHHh6lmpMW6v+kkJtYYRe6TkalxPZMz0HRgo+ndtbw==
   dependencies:
     "@types/web3" "^1.0.18"
     ethereumjs-util "6.0.0"
     jsbi-utils "^1.0.0"
     node-fetch "^2.3.0"
+    web3-core-promievent "^1.2.4"
 
 less-loader@^4.1.0:
   version "4.1.0"
@@ -8601,6 +8607,14 @@ web3-core-promievent@1.0.0-beta.33:
     any-promise "1.3.0"
     eventemitter3 "1.1.1"
 
+web3-core-promievent@^1.2.4:
+  version "1.2.6"
+  resolved "https://registry.yarnpkg.com/web3-core-promievent/-/web3-core-promievent-1.2.6.tgz#b1550a3a4163e48b8b704c1fe4b0084fc2dad8f5"
+  integrity sha512-km72kJef/qtQNiSjDJJVHIZvoVOm6ytW3FCYnOcCs7RIkviAb5JYlPiye0o4pJOLzCXYID7DK7Q9bhY8qWb1lw==
+  dependencies:
+    any-promise "1.3.0"
+    eventemitter3 "3.1.2"
+
 web3-core-requestmanager@1.0.0-beta.33:
   version "1.0.0-beta.33"
   resolved "https://registry.yarnpkg.com/web3-core-requestmanager/-/web3-core-requestmanager-1.0.0-beta.33.tgz#7a36c40354002dfb179ca2dbdb6a6012c9f719eb"