diff --git a/installer b/installer
index d0af155..589e665 100755
--- a/installer
+++ b/installer
@@ -53,7 +53,7 @@ apt-get install -y \
   nginx php-fpm php-cli \
   git build-essential autoconf automake libtool pkg-config \
   libjansson-dev libevent-dev libcurl4-openssl-dev libssl-dev zlib1g-dev \
-  openssl
+  openssl jq bc
 
 # ---------------------------------------------------------------------------
 # [3/8] Install Bitcoin Core from official binaries
@@ -61,24 +61,69 @@ apt-get install -y \
 echo "[3/8] Installing official Bitcoin Core binaries…"
 
 BTC_VER="27.0"
-BTC_BASE="bitcoin-${BTC_VER}"
-BTC_TAR="${BTC_BASE}-x86_64-linux-gnu.tar.gz"
-BTC_URL="https://bitcoincore.org/bin/bitcoin-core-${BTC_VER}/${BTC_TAR}"
-BTC_SUMS_URL="https://bitcoincore.org/bin/bitcoin-core-${BTC_VER}/SHA256SUMS"
 
-mkdir -p /tmp/bitcoin
-cd /tmp/bitcoin
+# ===== Detect CPU arch and install correct Bitcoin Core binary =====
 
-echo "Downloading Bitcoin Core ${BTC_VER}…"
-curl -LO "${BTC_URL}"
-curl -LO "${BTC_SUMS_URL}"
+detect_arch() {
+  # Prefer dpkg (Debian/Ubuntu), fall back to uname
+  local deb_arch
+  deb_arch=$(dpkg --print-architecture 2>/dev/null || true)
+  case "$deb_arch" in
+    amd64)   echo "x86_64-linux-gnu"; return ;;
+    arm64)   echo "aarch64-linux-gnu"; return ;;
+    armhf)   echo "arm-linux-gnueabihf"; return ;;
+  esac
 
-echo "Verifying checksum…"
-grep "${BTC_TAR}" SHA256SUMS | sha256sum -c -
+  # Fallback by kernel arch
+  local u
+  u=$(uname -m)
+  case "$u" in
+    x86_64)  echo "x86_64-linux-gnu" ;;
+    aarch64) echo "aarch64-linux-gnu" ;;
+    armv7l|armv6l)
+             echo "arm-linux-gnueabihf" ;;
+    *)
+      echo "unsupported"
+      ;;
+  esac
+}
 
-echo "Extracting…"
-tar -xzf "${BTC_TAR}"
-install -m 0755 -o root -g root ${BTC_BASE}/bin/* /usr/local/bin/
+BTC_PLAT="$(detect_arch)"
+if [ "$BTC_PLAT" = "unsupported" ]; then
+  echo "ERROR: Unsupported CPU architecture ($(uname -m))."
+  echo "Tip: For exotic arches, build from source using depends/ then install bitcoind/bitcoin-cli."
+  exit 1
+fi
+
+BASE_URL="https://bitcoincore.org/bin/bitcoin-core-$BTC_VER"
+TARBALL="bitcoin-$BTC_VER-$BTC_PLAT.tar.gz"
+TMPD="$(mktemp -d)"
+
+echo "[Bitcoin Core] Detected platform: $BTC_PLAT"
+echo "[Bitcoin Core] Downloading $TARBALL …"
+curl -fsSL "$BASE_URL/$TARBALL" -o "$TMPD/$TARBALL"
+
+# Get SHA256SUMS (and try to verify signature if gpg is present)
+curl -fsSL "$BASE_URL/SHA256SUMS" -o "$TMPD/SHA256SUMS"
+if command -v gpg >/dev/null 2>&1; then
+  curl -fsSL "$BASE_URL/SHA256SUMS.asc" -o "$TMPD/SHA256SUMS.asc" || true
+  # If you’ve already imported the Bitcoin Core release keys, this will verify.
+  # If not, we still proceed after SHA256 check below.
+  gpg --verify "$TMPD/SHA256SUMS.asc" "$TMPD/SHA256SUMS" || echo "[WARN] Could not verify SHA256SUMS signature (no keys?). Continuing with SHA256 check."
+fi
+
+echo "[Bitcoin Core] Verifying tarball checksum …"
+( cd "$TMPD" && grep " $TARBALL" SHA256SUMS | sha256sum -c - )
+
+echo "[Bitcoin Core] Installing to /usr/local/bin …"
+tar -xzf "$TMPD/$TARBALL" -C "$TMPD"
+install -m 0755 "$TMPD/bitcoin-$BTC_VER/bin/bitcoind"     /usr/local/bin/
+install -m 0755 "$TMPD/bitcoin-$BTC_VER/bin/bitcoin-cli"  /usr/local/bin/
+install -m 0755 "$TMPD/bitcoin-$BTC_VER/bin/bitcoin-tx"   /usr/local/bin/
+install -m 0755 "$TMPD/bitcoin-$BTC_VER/bin/bitcoin-wallet" /usr/local/bin/
+
+rm -rf "$TMPD"
+echo "[Bitcoin Core] Installed bitcoind/bitcoin-cli for $BTC_PLAT"
 
 # systemd service for bitcoind
 cat > /etc/systemd/system/bitcoind.service <<EOF