diff --git a/workflow/params.sh b/workflow/params.sh
index 94ac2c4..61720fa 100644
--- a/workflow/params.sh
+++ b/workflow/params.sh
@@ -13,3 +13,4 @@ NSLOTS=11          # number of slots in the dataset
 SLOTINDEX=3        # which slot we prove (0..NSLOTS-1)
 NCELLS=512         # number of cells in this slot
 
+PTAU_POWER=21
\ No newline at end of file
diff --git a/workflow/paths.sh b/workflow/paths.sh
index c01e566..9832fe0 100644
--- a/workflow/paths.sh
+++ b/workflow/paths.sh
@@ -2,6 +2,8 @@
 
 ORIG=`pwd`
 
+source ./params.sh
+
 NIMCLI_DIR="${ORIG}/../reference/nim/proof_input/"
 PTAU_DIR="${ORIG}/../ceremony"
 
@@ -10,7 +12,7 @@ CIRCUIT_PRF_DIR="${CIRCUIT_ROOT}/codex/"
 CIRCUIT_POS_DIR="${CIRCUIT_ROOT}/poseidon2/"
 CIRCUIT_LIB_DIR="${CIRCUIT_ROOT}/lib/"
 
-PTAU_FILE="powersOfTau28_hez_final_21.ptau"
+PTAU_FILE="powersOfTau28_hez_final_${PTAU_POWER}.ptau"
 PTAU_PATH="${PTAU_DIR}/${PTAU_FILE}"
 
 CIRCUIT_MAIN="proof_main"
diff --git a/workflow/ptau.sh b/workflow/ptau.sh
new file mode 100644
index 0000000..614dd73
--- /dev/null
+++ b/workflow/ptau.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+source ./paths.sh
+source ./params.sh
+
+PTAU_URL=https://storage.googleapis.com/zkevm/ptau/powersOfTau28_hez_final_${PTAU_POWER}.ptau
+
+mkdir -p ${PTAU_DIR}
+
+if [ -f ${PTAU_PATH} ]; then
+  echo "${PTAU_FILE} download already Completed!"
+  exit 0
+else
+  echo "Downloading ${PTAU_FILE}"
+  curl ${PTAU_URL} --output ${PTAU_PATH} --progress-bar
+  echo "${PTAU_FILE} download Completed!"
+fi
\ No newline at end of file