From f5699b0608ad0240f6bc99ec8f108c3a4b99c43c Mon Sep 17 00:00:00 2001
From: gcharang <mrgcharang@gmail.com>
Date: Sun, 13 Jun 2021 13:02:03 +0530
Subject: [PATCH 1/5] adds fetch-params script that still uses zcash url

---
 zcutil/fetch-params-zcash.sh | 210 +++++++++++++++++++++++++++++++++++
 1 file changed, 210 insertions(+)
 create mode 100644 zcutil/fetch-params-zcash.sh

diff --git a/zcutil/fetch-params-zcash.sh b/zcutil/fetch-params-zcash.sh
new file mode 100644
index 00000000000..bd298a5d255
--- /dev/null
+++ b/zcutil/fetch-params-zcash.sh
@@ -0,0 +1,210 @@
+#!/bin/bash
+
+set -eu
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    PARAMS_DIR="$HOME/Library/Application Support/ZcashParams"
+else
+    PARAMS_DIR="$HOME/.zcash-params"
+fi
+
+SPROUT_PKEY_REALNAME='sprout-proving.key.deprecated-sworn-elves'
+SPROUT_PKEY_NAME='sprout-proving.key'
+SPROUT_VKEY_NAME='sprout-verifying.key'
+SAPLING_SPEND_NAME='sapling-spend.params'
+SAPLING_OUTPUT_NAME='sapling-output.params'
+SAPLING_SPROUT_GROTH16_NAME='sprout-groth16.params'
+SPROUT_URL="https://z.cash/downloads"
+SPROUT_IPFS="/ipfs/QmZKKx7Xup7LiAtFRhYsE1M7waXcv9ir9eCECyXAFGxhEo"
+
+SHA256CMD="$(command -v sha256sum || echo shasum)"
+SHA256ARGS="$(command -v sha256sum >/dev/null || echo '-a 256')"
+
+WGETCMD="$(command -v wget || echo '')"
+IPFSCMD="$(command -v ipfs || echo '')"
+CURLCMD="$(command -v curl || echo '')"
+
+# fetch methods can be disabled with ZC_DISABLE_SOMETHING=1
+ZC_DISABLE_WGET="${ZC_DISABLE_WGET:-}"
+ZC_DISABLE_IPFS="${ZC_DISABLE_IPFS:-}"
+ZC_DISABLE_CURL="${ZC_DISABLE_CURL:-}"
+
+function fetch_wget {
+    if [ -z "$WGETCMD" ] || ! [ -z "$ZC_DISABLE_WGET" ]; then
+        return 1
+    fi
+
+    local filename="$1"
+    local dlname="$2"
+
+    cat <<EOF
+
+Retrieving (wget): $SPROUT_URL/$filename
+EOF
+
+    wget \
+        --progress=dot:giga \
+        --output-document="$dlname" \
+        --continue \
+        --retry-connrefused --waitretry=3 --timeout=30 \
+        "$SPROUT_URL/$filename"
+}
+
+function fetch_ipfs {
+    if [ -z "$IPFSCMD" ] || ! [ -z "$ZC_DISABLE_IPFS" ]; then
+        return 1
+    fi
+
+    local filename="$1"
+    local dlname="$2"
+
+    cat <<EOF
+
+Retrieving (ipfs): $SPROUT_IPFS/$filename
+EOF
+
+    ipfs get --output "$dlname" "$SPROUT_IPFS/$filename"
+}
+
+function fetch_curl {
+    if [ -z "$CURLCMD" ] || ! [ -z "$ZC_DISABLE_CURL" ]; then
+        return 1
+    fi
+
+    local filename="$1"
+    local dlname="$2"
+
+    cat <<EOF
+
+Retrieving (curl): $SPROUT_URL/$filename
+EOF
+
+    curl \
+        --output "$dlname" \
+        -# -L -C - \
+        "$SPROUT_URL/$filename"
+
+}
+
+function fetch_failure {
+    cat >&2 <<EOF
+
+Failed to fetch the Zcash zkSNARK parameters!
+Try installing one of the following programs and make sure you're online:
+
+ * ipfs
+ * wget
+ * curl
+
+EOF
+    exit 1
+}
+
+function fetch_params {
+    local filename="$1"
+    local output="$2"
+    local dlname="${output}.dl"
+    local expectedhash="$3"
+
+    if ! [ -f "$output" ]
+    then
+        for method in wget ipfs curl failure; do
+            if "fetch_$method" "$filename" "$dlname"; then
+                echo "Download successful!"
+                break
+            fi
+        done
+
+        "$SHA256CMD" $SHA256ARGS -c <<EOF
+$expectedhash  $dlname
+EOF
+
+        # Check the exit code of the shasum command:
+        CHECKSUM_RESULT=$?
+        if [ $CHECKSUM_RESULT -eq 0 ]; then
+            mv -v "$dlname" "$output"
+        else
+            echo "Failed to verify parameter checksums!" >&2
+            exit 1
+        fi
+    fi
+}
+
+# Use flock to prevent parallel execution.
+function lock() {
+    local lockfile=/tmp/fetch_params.lock
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+        if shlock -f ${lockfile} -p $$; then
+            return 0
+        else
+            return 1
+        fi
+    else
+        # create lock file
+        eval "exec 200>$lockfile"
+        # acquire the lock
+        flock -n 200 \
+            && return 0 \
+            || return 1
+    fi
+}
+
+function exit_locked_error {
+    echo "Only one instance of fetch-params.sh can be run at a time." >&2
+    exit 1
+}
+
+function main() {
+
+    lock fetch-params.sh \
+    || exit_locked_error
+
+    cat <<EOF
+Zcash - fetch-params.sh
+
+This script will fetch the Zcash zkSNARK parameters and verify their
+integrity with sha256sum.
+
+If they already exist locally, it will exit now and do nothing else.
+EOF
+
+    # Now create PARAMS_DIR and insert a README if necessary:
+    if ! [ -d "$PARAMS_DIR" ]
+    then
+        mkdir -p "$PARAMS_DIR"
+        README_PATH="$PARAMS_DIR/README"
+        cat >> "$README_PATH" <<EOF
+This directory stores common Zcash zkSNARK parameters. Note that it is
+distinct from the daemon's -datadir argument because the parameters are
+large and may be shared across multiple distinct -datadir's such as when
+setting up test networks.
+EOF
+
+        # This may be the first time the user's run this script, so give
+        # them some info, especially about bandwidth usage:
+        cat <<EOF
+The parameters are currently just under 911MB in size, so plan accordingly
+for your bandwidth constraints. If the files are already present and
+have the correct sha256sum, no networking is used.
+
+Creating params directory. For details about this directory, see:
+$README_PATH
+
+EOF
+    fi
+
+    cd "$PARAMS_DIR"
+
+    # Sprout parameters:
+    fetch_params "$SPROUT_PKEY_REALNAME" "$PARAMS_DIR/$SPROUT_PKEY_NAME" "8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2c0eef7"
+    fetch_params "$SPROUT_VKEY_NAME" "$PARAMS_DIR/$SPROUT_VKEY_NAME" "4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2fc5df82"
+
+    # Sapling parameters:
+    fetch_params "$SAPLING_SPEND_NAME" "$PARAMS_DIR/$SAPLING_SPEND_NAME" "8e48ffd23abb3a5fd9c5589204f32d9c31285a04b78096ba40a79b75677efc13"
+    fetch_params "$SAPLING_OUTPUT_NAME" "$PARAMS_DIR/$SAPLING_OUTPUT_NAME" "2f0ebbcbb9bb0bcffe95a397e7eba89c29eb4dde6191c339db88570e3f3fb0e4"
+    fetch_params "$SAPLING_SPROUT_GROTH16_NAME" "$PARAMS_DIR/$SAPLING_SPROUT_GROTH16_NAME" "b685d700c60328498fbde589c8c7c484c722b788b265b72af448a5bf0ee55b50"
+}
+
+main
+rm -f /tmp/fetch_params.lock
+exit 0

From fbb43f5b526b70f197190ac4fc63264282334f67 Mon Sep 17 00:00:00 2001
From: gcharang <mrgcharang@gmail.com>
Date: Sun, 13 Jun 2021 13:16:39 +0530
Subject: [PATCH 2/5] makes fetch-params-zcash script executable

---
 zcutil/fetch-params-zcash.sh | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 mode change 100644 => 100755 zcutil/fetch-params-zcash.sh

diff --git a/zcutil/fetch-params-zcash.sh b/zcutil/fetch-params-zcash.sh
old mode 100644
new mode 100755

From 52bed7905cdf6d374f130b57ad442053d57b3c47 Mon Sep 17 00:00:00 2001
From: gcharang <mrgcharang@gmail.com>
Date: Sun, 13 Jun 2021 14:39:23 +0530
Subject: [PATCH 3/5] updates windows fetchparam urls

---
 zcutil/VerusCoin.xml    | 2 +-
 zcutil/fetch-params.bat | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/zcutil/VerusCoin.xml b/zcutil/VerusCoin.xml
index 610533787a0..01cd64accef 100644
--- a/zcutil/VerusCoin.xml
+++ b/zcutil/VerusCoin.xml
@@ -252,7 +252,7 @@
                     <filename>${windows_folder_appdata}/ZcashParams/sprout-proving.key</filename>
                     <progressText>Zcash Params file: sprout-proving.key</progressText>
                     <showMessageOnError>0</showMessageOnError>
-                    <url>https://komodoplatform.com/downloads/sprout-proving.key</url>
+                    <url>https://z.cash/downloads/sprout-proving.key.deprecated-sworn-elves</url>
                 </httpGet>
             </actionList>
             <ruleList>
diff --git a/zcutil/fetch-params.bat b/zcutil/fetch-params.bat
index 46124d95230..519ef1c3b3a 100644
--- a/zcutil/fetch-params.bat
+++ b/zcutil/fetch-params.bat
@@ -6,7 +6,7 @@ MKDIR "%APPDATA%"\ZcashParams
 )
 IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-proving.key (
     ECHO Downloading Zcash trusted setup sprout-proving.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sprout-proving.key -O "%APPDATA%"\ZcashParams\sprout-proving.key
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sprout-proving.key.deprecated-sworn-elves -O "%APPDATA%"\ZcashParams\sprout-proving.key
 )
 IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-verifying.key (
     ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...

From a77a8b90bf46fc3ad9ca4739c40cb47a2c3c4dce Mon Sep 17 00:00:00 2001
From: gcharang <mrgcharang@gmail.com>
Date: Sun, 13 Jun 2021 15:35:45 +0530
Subject: [PATCH 4/5] updates fetch params scripts to use zcash urls for now

---
 zcutil/VerusCoin.xml         |   2 +-
 zcutil/fetch-params-zcash.sh | 210 -----------------------------------
 zcutil/fetch-params.bat      |   8 +-
 zcutil/fetch-params.sh       |   5 +-
 4 files changed, 8 insertions(+), 217 deletions(-)
 delete mode 100755 zcutil/fetch-params-zcash.sh

diff --git a/zcutil/VerusCoin.xml b/zcutil/VerusCoin.xml
index 01cd64accef..7e4b39d9468 100644
--- a/zcutil/VerusCoin.xml
+++ b/zcutil/VerusCoin.xml
@@ -274,7 +274,7 @@
                     <filename>${windows_folder_appdata}/ZcashParams/sprout-verifying.key</filename>
                     <progressText>Zcash Params file: sprout-verifying.key</progressText>
                     <showMessageOnError>0</showMessageOnError>
-                    <url>https://komodoplatform.com/downloads/sprout-verifying.key</url>
+                    <url>https://z.cash/downloads/sprout-verifying.key</url>
                 </httpGet>
             </actionList>
             <ruleList>
diff --git a/zcutil/fetch-params-zcash.sh b/zcutil/fetch-params-zcash.sh
deleted file mode 100755
index bd298a5d255..00000000000
--- a/zcutil/fetch-params-zcash.sh
+++ /dev/null
@@ -1,210 +0,0 @@
-#!/bin/bash
-
-set -eu
-
-if [[ "$OSTYPE" == "darwin"* ]]; then
-    PARAMS_DIR="$HOME/Library/Application Support/ZcashParams"
-else
-    PARAMS_DIR="$HOME/.zcash-params"
-fi
-
-SPROUT_PKEY_REALNAME='sprout-proving.key.deprecated-sworn-elves'
-SPROUT_PKEY_NAME='sprout-proving.key'
-SPROUT_VKEY_NAME='sprout-verifying.key'
-SAPLING_SPEND_NAME='sapling-spend.params'
-SAPLING_OUTPUT_NAME='sapling-output.params'
-SAPLING_SPROUT_GROTH16_NAME='sprout-groth16.params'
-SPROUT_URL="https://z.cash/downloads"
-SPROUT_IPFS="/ipfs/QmZKKx7Xup7LiAtFRhYsE1M7waXcv9ir9eCECyXAFGxhEo"
-
-SHA256CMD="$(command -v sha256sum || echo shasum)"
-SHA256ARGS="$(command -v sha256sum >/dev/null || echo '-a 256')"
-
-WGETCMD="$(command -v wget || echo '')"
-IPFSCMD="$(command -v ipfs || echo '')"
-CURLCMD="$(command -v curl || echo '')"
-
-# fetch methods can be disabled with ZC_DISABLE_SOMETHING=1
-ZC_DISABLE_WGET="${ZC_DISABLE_WGET:-}"
-ZC_DISABLE_IPFS="${ZC_DISABLE_IPFS:-}"
-ZC_DISABLE_CURL="${ZC_DISABLE_CURL:-}"
-
-function fetch_wget {
-    if [ -z "$WGETCMD" ] || ! [ -z "$ZC_DISABLE_WGET" ]; then
-        return 1
-    fi
-
-    local filename="$1"
-    local dlname="$2"
-
-    cat <<EOF
-
-Retrieving (wget): $SPROUT_URL/$filename
-EOF
-
-    wget \
-        --progress=dot:giga \
-        --output-document="$dlname" \
-        --continue \
-        --retry-connrefused --waitretry=3 --timeout=30 \
-        "$SPROUT_URL/$filename"
-}
-
-function fetch_ipfs {
-    if [ -z "$IPFSCMD" ] || ! [ -z "$ZC_DISABLE_IPFS" ]; then
-        return 1
-    fi
-
-    local filename="$1"
-    local dlname="$2"
-
-    cat <<EOF
-
-Retrieving (ipfs): $SPROUT_IPFS/$filename
-EOF
-
-    ipfs get --output "$dlname" "$SPROUT_IPFS/$filename"
-}
-
-function fetch_curl {
-    if [ -z "$CURLCMD" ] || ! [ -z "$ZC_DISABLE_CURL" ]; then
-        return 1
-    fi
-
-    local filename="$1"
-    local dlname="$2"
-
-    cat <<EOF
-
-Retrieving (curl): $SPROUT_URL/$filename
-EOF
-
-    curl \
-        --output "$dlname" \
-        -# -L -C - \
-        "$SPROUT_URL/$filename"
-
-}
-
-function fetch_failure {
-    cat >&2 <<EOF
-
-Failed to fetch the Zcash zkSNARK parameters!
-Try installing one of the following programs and make sure you're online:
-
- * ipfs
- * wget
- * curl
-
-EOF
-    exit 1
-}
-
-function fetch_params {
-    local filename="$1"
-    local output="$2"
-    local dlname="${output}.dl"
-    local expectedhash="$3"
-
-    if ! [ -f "$output" ]
-    then
-        for method in wget ipfs curl failure; do
-            if "fetch_$method" "$filename" "$dlname"; then
-                echo "Download successful!"
-                break
-            fi
-        done
-
-        "$SHA256CMD" $SHA256ARGS -c <<EOF
-$expectedhash  $dlname
-EOF
-
-        # Check the exit code of the shasum command:
-        CHECKSUM_RESULT=$?
-        if [ $CHECKSUM_RESULT -eq 0 ]; then
-            mv -v "$dlname" "$output"
-        else
-            echo "Failed to verify parameter checksums!" >&2
-            exit 1
-        fi
-    fi
-}
-
-# Use flock to prevent parallel execution.
-function lock() {
-    local lockfile=/tmp/fetch_params.lock
-    if [[ "$OSTYPE" == "darwin"* ]]; then
-        if shlock -f ${lockfile} -p $$; then
-            return 0
-        else
-            return 1
-        fi
-    else
-        # create lock file
-        eval "exec 200>$lockfile"
-        # acquire the lock
-        flock -n 200 \
-            && return 0 \
-            || return 1
-    fi
-}
-
-function exit_locked_error {
-    echo "Only one instance of fetch-params.sh can be run at a time." >&2
-    exit 1
-}
-
-function main() {
-
-    lock fetch-params.sh \
-    || exit_locked_error
-
-    cat <<EOF
-Zcash - fetch-params.sh
-
-This script will fetch the Zcash zkSNARK parameters and verify their
-integrity with sha256sum.
-
-If they already exist locally, it will exit now and do nothing else.
-EOF
-
-    # Now create PARAMS_DIR and insert a README if necessary:
-    if ! [ -d "$PARAMS_DIR" ]
-    then
-        mkdir -p "$PARAMS_DIR"
-        README_PATH="$PARAMS_DIR/README"
-        cat >> "$README_PATH" <<EOF
-This directory stores common Zcash zkSNARK parameters. Note that it is
-distinct from the daemon's -datadir argument because the parameters are
-large and may be shared across multiple distinct -datadir's such as when
-setting up test networks.
-EOF
-
-        # This may be the first time the user's run this script, so give
-        # them some info, especially about bandwidth usage:
-        cat <<EOF
-The parameters are currently just under 911MB in size, so plan accordingly
-for your bandwidth constraints. If the files are already present and
-have the correct sha256sum, no networking is used.
-
-Creating params directory. For details about this directory, see:
-$README_PATH
-
-EOF
-    fi
-
-    cd "$PARAMS_DIR"
-
-    # Sprout parameters:
-    fetch_params "$SPROUT_PKEY_REALNAME" "$PARAMS_DIR/$SPROUT_PKEY_NAME" "8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2c0eef7"
-    fetch_params "$SPROUT_VKEY_NAME" "$PARAMS_DIR/$SPROUT_VKEY_NAME" "4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2fc5df82"
-
-    # Sapling parameters:
-    fetch_params "$SAPLING_SPEND_NAME" "$PARAMS_DIR/$SAPLING_SPEND_NAME" "8e48ffd23abb3a5fd9c5589204f32d9c31285a04b78096ba40a79b75677efc13"
-    fetch_params "$SAPLING_OUTPUT_NAME" "$PARAMS_DIR/$SAPLING_OUTPUT_NAME" "2f0ebbcbb9bb0bcffe95a397e7eba89c29eb4dde6191c339db88570e3f3fb0e4"
-    fetch_params "$SAPLING_SPROUT_GROTH16_NAME" "$PARAMS_DIR/$SAPLING_SPROUT_GROTH16_NAME" "b685d700c60328498fbde589c8c7c484c722b788b265b72af448a5bf0ee55b50"
-}
-
-main
-rm -f /tmp/fetch_params.lock
-exit 0
diff --git a/zcutil/fetch-params.bat b/zcutil/fetch-params.bat
index 519ef1c3b3a..0b542d28c86 100644
--- a/zcutil/fetch-params.bat
+++ b/zcutil/fetch-params.bat
@@ -10,19 +10,19 @@ IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-proving.key (
 )
 IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-verifying.key (
     ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sprout-verifying.key -O "%APPDATA%"\ZcashParams\sprout-verifying.key
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sprout-verifying.key -O "%APPDATA%"\ZcashParams\sprout-verifying.key
 )
 IF NOT EXIST "%APPDATA%"\ZcashParams\sapling-spend.params (
     ECHO Downloading Zcash trusted setup sprout-proving.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sapling-spend.params -O "%APPDATA%"\ZcashParams\sapling-spend.params
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sapling-spend.params -O "%APPDATA%"\ZcashParams\sapling-spend.params
 )
 IF NOT EXIST "%APPDATA%"\ZcashParams\sapling-output.params (
     ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sapling-output.params -O "%APPDATA%"\ZcashParams\sapling-output.params
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sapling-output.params -O "%APPDATA%"\ZcashParams\sapling-output.params
 )
 IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-groth16.params (
     ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sprout-groth16.params -O "%APPDATA%"\ZcashParams\sprout-groth16.params
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sprout-groth16.params -O "%APPDATA%"\ZcashParams\sprout-groth16.params
 )
 goto :EOF
 :GET_CURRENT_DIR
diff --git a/zcutil/fetch-params.sh b/zcutil/fetch-params.sh
index 7e9154eec36..bd298a5d255 100755
--- a/zcutil/fetch-params.sh
+++ b/zcutil/fetch-params.sh
@@ -8,12 +8,13 @@ else
     PARAMS_DIR="$HOME/.zcash-params"
 fi
 
+SPROUT_PKEY_REALNAME='sprout-proving.key.deprecated-sworn-elves'
 SPROUT_PKEY_NAME='sprout-proving.key'
 SPROUT_VKEY_NAME='sprout-verifying.key'
 SAPLING_SPEND_NAME='sapling-spend.params'
 SAPLING_OUTPUT_NAME='sapling-output.params'
 SAPLING_SPROUT_GROTH16_NAME='sprout-groth16.params'
-SPROUT_URL="https://komodoplatform.com/downloads"
+SPROUT_URL="https://z.cash/downloads"
 SPROUT_IPFS="/ipfs/QmZKKx7Xup7LiAtFRhYsE1M7waXcv9ir9eCECyXAFGxhEo"
 
 SHA256CMD="$(command -v sha256sum || echo shasum)"
@@ -195,7 +196,7 @@ EOF
     cd "$PARAMS_DIR"
 
     # Sprout parameters:
-    fetch_params "$SPROUT_PKEY_NAME" "$PARAMS_DIR/$SPROUT_PKEY_NAME" "8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2c0eef7"
+    fetch_params "$SPROUT_PKEY_REALNAME" "$PARAMS_DIR/$SPROUT_PKEY_NAME" "8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2c0eef7"
     fetch_params "$SPROUT_VKEY_NAME" "$PARAMS_DIR/$SPROUT_VKEY_NAME" "4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2fc5df82"
 
     # Sapling parameters:

From 86d0bc1d5b11a93fd44f52da8d18aee03c9cfdc2 Mon Sep 17 00:00:00 2001
From: gcharang <mrgcharang@gmail.com>
Date: Sun, 13 Jun 2021 15:56:31 +0530
Subject: [PATCH 5/5] adds alt windows fetchparam script

---
 zcutil/fetch-params-alt.bat | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 zcutil/fetch-params-alt.bat

diff --git a/zcutil/fetch-params-alt.bat b/zcutil/fetch-params-alt.bat
new file mode 100644
index 00000000000..46124d95230
--- /dev/null
+++ b/zcutil/fetch-params-alt.bat
@@ -0,0 +1,32 @@
+@echo off
+call :GET_CURRENT_DIR
+cd %THIS_DIR%
+IF NOT EXIST "%APPDATA%"\ZcashParams (
+MKDIR "%APPDATA%"\ZcashParams
+)
+IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-proving.key (
+    ECHO Downloading Zcash trusted setup sprout-proving.key, this may take a while ...
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sprout-proving.key -O "%APPDATA%"\ZcashParams\sprout-proving.key
+)
+IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-verifying.key (
+    ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sprout-verifying.key -O "%APPDATA%"\ZcashParams\sprout-verifying.key
+)
+IF NOT EXIST "%APPDATA%"\ZcashParams\sapling-spend.params (
+    ECHO Downloading Zcash trusted setup sprout-proving.key, this may take a while ...
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sapling-spend.params -O "%APPDATA%"\ZcashParams\sapling-spend.params
+)
+IF NOT EXIST "%APPDATA%"\ZcashParams\sapling-output.params (
+    ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sapling-output.params -O "%APPDATA%"\ZcashParams\sapling-output.params
+)
+IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-groth16.params (
+    ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
+    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://komodoplatform.com/downloads/sprout-groth16.params -O "%APPDATA%"\ZcashParams\sprout-groth16.params
+)
+goto :EOF
+:GET_CURRENT_DIR
+pushd %~dp0
+set THIS_DIR=%CD%
+popd
+goto :EOF