diff --git a/.github/workflows/check-shell-validation.yml b/.github/workflows/check-shell-validation.yml
new file mode 100644
index 0000000..ea647da
--- /dev/null
+++ b/.github/workflows/check-shell-validation.yml
@@ -0,0 +1,19 @@
+name: "[Check]: Shell validation"
+
+on:
+  pull_request:
+    paths:
+      - "**.sh"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: shellcheck
+        run: ./scripts/shellcheck.sh
diff --git a/.github/workflows/check_releases.yml b/.github/workflows/check_releases.yml
index c14561c..6bf5214 100644
--- a/.github/workflows/check_releases.yml
+++ b/.github/workflows/check_releases.yml
@@ -12,6 +12,15 @@ jobs:
       - uses: actions/setup-python@v4
       - run: python check_releases.py
 
+  releases-json-integrity-check:
+    name: releases.json integrity check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Check releases.json files changes
+        run: ./scripts/run-releases-json-for-all-devices.sh
+
   releases-revision-checks:
     name: Releases revision Checks
     runs-on: ubuntu-latest
diff --git a/ci/s3sync.sh b/ci/s3sync.sh
index ced114d..60d05c2 100755
--- a/ci/s3sync.sh
+++ b/ci/s3sync.sh
@@ -6,11 +6,9 @@
 
 DIRS="bootloader bridge firmware legal registry udev suite connect security transparency misc"
 BUCKET=data.trezor.io
-ROLLBACK=rollback-data.trezor.io
 DISTRIBUTION_ID="E1ERY5K2OTKKI1"
 
-./check_releases.py
-if [ "$?" != "0" ]; then
+if ! ./check_releases.py; then
     echo "check_releases.py failed."
     exit
 fi
@@ -21,10 +19,10 @@ set -e
 # aws s3 sync s3://$BUCKET s3://$ROLLBACK
 
 for DIR in $DIRS; do
-    if [ "x$1" == "x-d" ]; then
-        aws s3 sync --delete --cache-control 'public, max-age=3600' $DIR s3://$BUCKET/$DIR
+    if [ "$1" == "-d" ]; then
+        aws s3 sync --delete --cache-control 'public, max-age=3600' "$DIR" s3://$BUCKET/"$DIR"
     else
-        aws s3 sync --cache-control 'public, max-age=3600' $DIR s3://$BUCKET/$DIR
+        aws s3 sync --cache-control 'public, max-age=3600' "$DIR" s3://$BUCKET/"$DIR"
     fi
 done
 
diff --git a/firmware/t3b1/releases.json b/firmware/t3b1/releases.json
new file mode 100644
index 0000000..0637a08
--- /dev/null
+++ b/firmware/t3b1/releases.json
@@ -0,0 +1 @@
+[]
\ No newline at end of file
diff --git a/scripts/check-firmware-presence-in-releases-json.sh b/scripts/check-firmware-presence-in-releases-json.sh
new file mode 100755
index 0000000..0ee2eac
--- /dev/null
+++ b/scripts/check-firmware-presence-in-releases-json.sh
@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+
+PARENT_PATH=$( cd "$(dirname "${BASH_SOURCE[0]}")" || exit ; pwd -P )
+
+GREEN='\033[0;32m'
+RED='\033[0;31m'
+NC='\033[0m' # No Color
+
+if [[ $# -ne 1 ]]
+    then
+        echo "must provide 1 argument. $# provided"
+        exit 1
+fi
+
+DEVICE=$1
+
+extract_filenames_from_json() {
+  local json_file="$1"
+  jq -r '.[] | select(.url) | .url, .url_bitcoinonly' "$json_file" | xargs -n 1 basename | sort | uniq \
+    | grep -v "null" # filter out null from missing .url_bitcoinonly for older firmwares
+}
+
+list_files_in_directory() {
+  local dir="$1"
+  find "$dir" -type f -name "*.bin" -exec basename {} \; | sort \
+    | grep -v "trezor-inter-" | grep -v "trezor-t1tb-inter-" # filer out Intermediary firmwares
+}
+
+compare_files() {
+  local json_file="$1"
+  local directory="$2"
+
+  expected_files=$(extract_filenames_from_json "$json_file")
+  actual_files=$(list_files_in_directory "$directory")
+
+  missing_files=$(comm -23 <(echo "$expected_files") <(echo "$actual_files"))
+  extra_files=$(comm -13 <(echo "$expected_files") <(echo "$actual_files"))
+
+  if [[ -z "$missing_files" && -z "$extra_files" ]]; then
+    echo -e "${GREEN}All files are present and accounted for.${NC}"
+  else
+    if [[ -n "$missing_files" ]]; then
+      echo -e "${RED}Missing files:"
+      echo "$missing_files" | awk '{print "    " $0}'
+      echo -e "${NC}"
+    fi
+    if [[ -n "$extra_files" ]]; then
+      echo -e "${RED}Extra files in directory:"
+      echo "$extra_files" | awk '{print "    " $0}'
+      echo -e "${NC}"
+    fi
+
+    exit 1
+  fi
+}
+
+json_file=$PARENT_PATH"/../firmware/"$DEVICE/"releases.json"
+directory=$PARENT_PATH"/../firmware/"$DEVICE
+
+echo "Checking directory: $directory"
+
+compare_files "$json_file" "$directory"
diff --git a/scripts/run-releases-json-for-all-devices.sh b/scripts/run-releases-json-for-all-devices.sh
new file mode 100755
index 0000000..891b0aa
--- /dev/null
+++ b/scripts/run-releases-json-for-all-devices.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+DEVICE_PATHS=$(find firmware -maxdepth 1 -type d ! -name 'translations' ! -name 'README.md' ! -name 'firmware')
+
+for FILE in $DEVICE_PATHS; 
+    do 
+        DEVICE_MODEL=$(basename "$FILE")
+        if ! ./scripts/check-firmware-presence-in-releases-json.sh "$DEVICE_MODEL" ; then
+            exit 1
+        fi;
+        
+        echo
+    done
\ No newline at end of file
diff --git a/scripts/shellcheck.sh b/scripts/shellcheck.sh
new file mode 100755
index 0000000..9254743
--- /dev/null
+++ b/scripts/shellcheck.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -e
+set -u
+set -x
+set -o pipefail
+
+shellcheck --version
+
+find . -type f -name '*.sh' -exec shellcheck {} +