diff --git a/zcutil/fetch-params.sh b/zcutil/fetch-params.sh
index 6112c624..46be96a8 100755
--- a/zcutil/fetch-params.sh
+++ b/zcutil/fetch-params.sh
@@ -6,10 +6,13 @@ PARAMS_DIR="$HOME/.zcash-params"
 
 REGTEST_PKEY_NAME='zc-testnet-public-alpha-proving.key'
 REGTEST_VKEY_NAME='zc-testnet-public-alpha-verification.key'
-REGTEST_PKEY_URL="https://zca.sh/downloads/$REGTEST_PKEY_NAME"
-REGTEST_VKEY_URL="https://zca.sh/downloads/$REGTEST_VKEY_NAME"
+REGTEST_PKEY_URL="https://z.cash/downloads/$REGTEST_PKEY_NAME"
+REGTEST_VKEY_URL="https://z.cash/downloads/$REGTEST_VKEY_NAME"
 REGTEST_DIR="$PARAMS_DIR/regtest"
 
+# This should have the same params as regtest. We use symlinks for now.
+TESTNET3_DIR="$PARAMS_DIR/testnet3"
+
 
 # Note: This assumes cwd is set appropriately!
 function fetch_params {
@@ -61,9 +64,19 @@ cd "$REGTEST_DIR"
 fetch_params "$REGTEST_PKEY_URL"
 fetch_params "$REGTEST_VKEY_URL"
 
+cd ..
+
+echo 'Updating testnet3 symlinks to regtest parameters.'
+mkdir -p "$TESTNET3_DIR"
+ln -sf "../regtest/$REGTEST_PKEY_NAME" "$TESTNET3_DIR/$REGTEST_PKEY_NAME"
+ln -sf "../regtest/$REGTEST_VKEY_NAME" "$TESTNET3_DIR/$REGTEST_VKEY_NAME"
+
 # Now verify their hashes:
 echo 'Verifying parameter file integrity via sha256sum...'
 sha256sum --check - <<EOF
-7844a96933979158886a5b69fb163f49de76120fa1dcfc33b16c83c134e61817  $REGTEST_PKEY_NAME
-6902fd687bface72e572a7cda57f6da5a0c606c7b9769f30becd255e57924f41  $REGTEST_VKEY_NAME
+7844a96933979158886a5b69fb163f49de76120fa1dcfc33b16c83c134e61817  regtest/$REGTEST_PKEY_NAME
+7844a96933979158886a5b69fb163f49de76120fa1dcfc33b16c83c134e61817  testnet3/$REGTEST_PKEY_NAME
+6902fd687bface72e572a7cda57f6da5a0c606c7b9769f30becd255e57924f41  regtest/$REGTEST_VKEY_NAME
+6902fd687bface72e572a7cda57f6da5a0c606c7b9769f30becd255e57924f41  testnet3/$REGTEST_VKEY_NAME
 EOF
+