diff --git a/CMakeLists.txt b/CMakeLists.txt
index 125a3b5..92e18be 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,24 +21,28 @@ IF (APPLE)
     SET(CMAKE_OSX_ARCHITECTURES "arm64;x86_64" CACHE STRING "Build architectures for Mac OS X" FORCE)
   ENDIF ()
 ENDIF (APPLE)
+IF(APPLE)
+  IF("${CMAKE_OSX_ARCHITECTURES}" STREQUAL "")
+  ENDIF()
+ENDIF(APPLE)
 
 project(libaaruformat C)
 
 add_compile_definitions(__STDC_FORMAT_MACROS=1)
 
-if ("${CMAKE_C_COMPILER_ID}" MATCHES "MSVC" AND "${CMAKE_C_COMPILER_ARCHITECTURE_ID}" MATCHES "ARMV7")
+if("${CMAKE_C_COMPILER_ID}" MATCHES "MSVC" AND "${CMAKE_C_COMPILER_ARCHITECTURE_ID}" MATCHES "ARMV7")
   set(CMAKE_C_STANDARD 11)
-else ()
+else()
   set(CMAKE_C_STANDARD 99)
-endif ()
+endif()
 
-if ("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
-  if ("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "aarch64" OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm")
+if("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
+  if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "aarch64" OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm")
     set(WIN32 TRUE)
-  endif ()
+  endif()
 
   add_link_options(-static-libgcc)
-endif ()
+endif()
 
 message("Detected system processor: ${CMAKE_SYSTEM_PROCESSOR}")
 message("Detected vs platform name: ${CMAKE_C_COMPILER_ARCHITECTURE_ID}")
@@ -48,65 +52,68 @@ message("Detected platform: ${CMAKE_C_PLATFORM_ID}")
 message("Size of (void*): ${CMAKE_SIZEOF_VOID_P}")
 
 # Check if target is 64-bit
-if ("${CMAKE_SIZEOF_VOID_P}" MATCHES "8" OR "${CMAKE_C_COMPILER_ARCHITECTURE_ID}" MATCHES "x64" OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "x86_64" OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "AMD64" OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "aarch64")
+if("${CMAKE_SIZEOF_VOID_P}" MATCHES "8" OR "${CMAKE_C_COMPILER_ARCHITECTURE_ID}" MATCHES "x64" OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "x86_64" OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "AMD64" OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "aarch64")
   set(ARCHITECTURE_IS_64BIT TRUE)
-endif ()
+endif()
 
-if ("${CMAKE_BUILD_TYPE}" MATCHES "Release")
+if("${CMAKE_BUILD_TYPE}" MATCHES "Release")
   add_compile_definitions(NDEBUG)
 
-  if ("${CMAKE_C_COMPILER_ID}" MATCHES "MSVC")
+  if("${CMAKE_C_COMPILER_ID}" MATCHES "MSVC")
     add_compile_options("/O2" "/fp:fast")
-    if (${CMAKE_C_COMPILER_ARCHITECTURE_ID} MATCHES "X86" OR ${CMAKE_C_COMPILER_ARCHITECTURE_ID} MATCHES "x64")
+    if(${CMAKE_C_COMPILER_ARCHITECTURE_ID} MATCHES "X86" OR ${CMAKE_C_COMPILER_ARCHITECTURE_ID} MATCHES "x64")
       add_compile_options("/arch:SSE2")
-    endif ()
-  else ()
+    endif()
+  else()
     add_compile_options(-ffast-math -O3)
 
-    if (${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86_64" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "i686" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "AMD64")
-      if (NOT "${CMAKE_C_COMPILER_ID}" MATCHES "AppleClang")
+    if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86_64" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "i686" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "AMD64")
+      if(NOT "${CMAKE_C_COMPILER_ID}" MATCHES "AppleClang")
         add_compile_options(-march=core2 -mtune=westmere -mfpmath=sse)
-      endif ()
+      endif()
 
       add_compile_options(-msse3)
 
-      if (NOT "${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
+      if(NOT "${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
         add_compile_options(-flto)
-      endif ()
-    elseif (${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64")
-      if (NOT "${CMAKE_C_COMPILER_ID}" MATCHES "AppleClang")
+      endif()
+    elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64")
+      if(NOT "${CMAKE_C_COMPILER_ID}" MATCHES "AppleClang")
         add_compile_options(-march=armv8-a)
-      endif ()
+      endif()
 
-      if (NOT "${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
+      if(NOT "${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
         add_compile_options(-flto)
-      endif ()
-    elseif (${CMAKE_SYSTEM_PROCESSOR} MATCHES "armv7l" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm")
-      if (NOT "${CMAKE_C_COMPILER_ID}" MATCHES "AppleClang")
+      endif()
+    elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "armv7l" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm")
+      if(NOT "${CMAKE_C_COMPILER_ID}" MATCHES "AppleClang")
         add_compile_options(-march=armv7+fp -mfpu=vfpv3-d16)
-      endif ()
-    elseif (${CMAKE_SYSTEM_PROCESSOR} MATCHES "mips")
-      if (NOT "${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
+      endif()
+    elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "mips")
+      if(NOT "${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
         add_compile_options(-flto)
-      endif ()
-    endif ()
-  endif ()
-endif ()
+      endif()
+    endif()
+  endif()
+endif()
 
 add_library(aaruformat SHARED include/aaruformat/consts.h include/aaruformat/enums.h include/aaru.h include/aaruformat.h
-        include/aaruformat/decls.h include/aaruformat/structs.h src/identify.c src/open.c include/aaruformat/context.h
-        src/close.c include/aaruformat/errors.h src/read.c include/aaruformat/crc64.h src/cst.c src/ecc_cd.c src/helpers.c
-        src/simd.c include/aaruformat/simd.h src/crc64/crc64.c src/crc64/crc64_clmul.c src/crc64/crc64_vmull.c
-        src/crc64/arm_vmull.c src/crc64/arm_vmull.h src/spamsum.c include/aaruformat/spamsum.h include/aaruformat/flac.h
-        src/flac.c src/lzma.c src/lru.c include/aaruformat/lru.h include/aaruformat/endian.h src/verify.c
-        include/aaruformat/structs/header.h
-        include/aaruformat/structs/ddt.h
-        include/aaruformat/structs/index.h
-        include/aaruformat/structs/data.h
-        include/aaruformat/structs/metadata.h
-        include/aaruformat/structs/dump.h
-        include/aaruformat/structs/checksum.h
-        include/aaruformat/structs/optical.h)
+            include/aaruformat/decls.h include/aaruformat/structs.h src/identify.c src/open.c include/aaruformat/context.h
+            src/close.c include/aaruformat/errors.h src/read.c include/aaruformat/crc64.h src/cst.c src/ecc_cd.c src/helpers.c
+            src/simd.c include/aaruformat/simd.h src/crc64/crc64.c src/crc64/crc64_clmul.c src/crc64/crc64_vmull.c
+            src/crc64/arm_vmull.c src/crc64/arm_vmull.h src/spamsum.c include/aaruformat/spamsum.h include/aaruformat/flac.h
+            src/flac.c src/lzma.c src/lru.c include/aaruformat/lru.h include/aaruformat/endian.h src/verify.c
+            include/aaruformat/structs/header.h
+            include/aaruformat/structs/ddt.h
+            include/aaruformat/structs/index.h
+            include/aaruformat/structs/data.h
+            include/aaruformat/structs/metadata.h
+            include/aaruformat/structs/dump.h
+            include/aaruformat/structs/checksum.h
+            include/aaruformat/structs/optical.h
+            src/index/index_v1.c
+            include/internal.h
+            src/index/index_v2.c)
 
 include_directories(include include/aaruformat)
 
@@ -114,7 +121,7 @@ include(3rdparty/flac.cmake)
 include(3rdparty/lzma.cmake)
 
 macro(TARGET_LINK_LIBRARIES_WHOLE_ARCHIVE target)
-  if (MSVC)
+  if(MSVC)
     foreach(lib IN LISTS ARGN)
       set_target_properties(${target} PROPERTIES LINK_FLAGS "/WHOLEARCHIVE:${lib}")
     endforeach()
@@ -129,11 +136,11 @@ macro(TARGET_LINK_LIBRARIES_WHOLE_ARCHIVE target)
   endif()
 endmacro()
 
-if (NOT "${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW" OR (NOT ${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm" AND NOT ${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64"))
+if(NOT "${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW" OR (NOT ${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm" AND NOT ${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64"))
   set_property(TARGET aaruformat PROPERTY POSITION_INDEPENDENT_CODE TRUE)
-else ()
+else()
   set_property(TARGET aaruformat PROPERTY POSITION_INDEPENDENT_CODE FALSE)
-endif ()
+endif()
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake-modules")
 
@@ -142,32 +149,32 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake-modules")
 find_package(OpenSSL QUIET)
 find_package(LibreSSL QUIET)
 
-if (OpenSSL_FOUND)
+if(OpenSSL_FOUND)
   message("-- OpenSSL VERSION: ${OPENSSL_VERSION}")
-endif ()
+endif()
 
-if (LIBRESSL_FOUND)
+if(LIBRESSL_FOUND)
   message("-- LibreSSL VERSION: ${LIBRESSL_VERSION}")
-endif ()
+endif()
 
-if (OpenSSL_FOUND OR LIBRESSL_FOUND)
+if(OpenSSL_FOUND OR LIBRESSL_FOUND)
   add_compile_definitions(AARU_HAS_SHA256)
-endif ()
+endif()
 
-if (LIBRESSL_FOUND)
+if(LIBRESSL_FOUND)
   TARGET_LINK_LIBRARIES_WHOLE_ARCHIVE(aaruformat ${LIBRESSL_CRYPTO_LIBRARY})
-elseif (OpenSSL_FOUND)
+elseif(OpenSSL_FOUND)
   TARGET_LINK_LIBRARIES_WHOLE_ARCHIVE(aaruformat ${OPENSSL_CRYPTO_LIBRARY})
-endif ()
+endif()
 
 include_directories(include 3rdparty/uthash/src)
 
 include(CheckLibraryExists)
 
 check_library_exists(m log "" HAVE_LIB_M)
-if (HAVE_LIB_M)
+if(HAVE_LIB_M)
   TARGET_LINK_LIBRARIES_WHOLE_ARCHIVE(aaruformat m)
-endif ()
+endif()
 
 add_subdirectory(tests)
 add_subdirectory(tool)
\ No newline at end of file
diff --git a/include/aaruformat/enums.h b/include/aaruformat/enums.h
index 7673f24..7032eb3 100644
--- a/include/aaruformat/enums.h
+++ b/include/aaruformat/enums.h
@@ -205,9 +205,11 @@ typedef enum
     /** Block containing data */
     DataBlock                    = 0x4B4C4244,
     /** Block containing a deduplication table */
-    DeDuplicationTable           = 0X2A544444,
+    DeDuplicationTable           = 0x2A544444,
     /** Block containing the index */
-    IndexBlock                   = 0X58444E49,
+    IndexBlock                   = 0x58444E49,
+    /** Block containing the index v2 */
+    IndexBlock2                  = 0x32584449,
     /** Block containing logical geometry */
     GeometryBlock                = 0x4D4F4547,
     /** Block containing metadata */
diff --git a/include/aaruformat/structs/index.h b/include/aaruformat/structs/index.h
index ca8b4fd..1278feb 100644
--- a/include/aaruformat/structs/index.h
+++ b/include/aaruformat/structs/index.h
@@ -22,7 +22,8 @@
 #pragma pack(push, 1)
 
 /**Header for the index, followed by entries */
-typedef struct IndexHeader {
+typedef struct IndexHeader
+{
     /**Identifier, <see cref="BlockType.Index" /> */
     uint32_t identifier;
     /**How many entries follow this header */
@@ -31,8 +32,20 @@ typedef struct IndexHeader {
     uint64_t crc64;
 } IndexHeader;
 
+/**Header for the index, followed by entries */
+typedef struct IndexHeader2
+{
+    /**Identifier, <see cref="BlockType.Index" /> */
+    uint32_t identifier;
+    /**How many entries follow this header */
+    uint64_t entries;
+    /**CRC64-ECMA of the index */
+    uint64_t crc64;
+} IndexHeader2;
+
 /**Index entry */
-typedef struct IndexEntry {
+typedef struct IndexEntry
+{
     /**Type of item pointed by this entry */
     uint32_t blockType;
     /**Type of data contained by the block pointed by this entry */
@@ -43,4 +56,4 @@ typedef struct IndexEntry {
 
 #pragma pack(pop)
 
-#endif //LIBAARUFORMAT_INDEX_H
+#endif  // LIBAARUFORMAT_INDEX_H
diff --git a/include/internal.h b/include/internal.h
index 2258de1..115238d 100644
--- a/include/internal.h
+++ b/include/internal.h
@@ -23,5 +23,7 @@
 
 UT_array *process_index_v1(aaruformatContext *ctx);
 int32_t   verify_index_v1(aaruformatContext *ctx);
+UT_array *process_index_v2(aaruformatContext *ctx);
+int32_t   verify_index_v2(aaruformatContext *ctx);
 
 #endif  // LIBAARUFORMAT_INTERNAL_H
diff --git a/src/index_v1.c b/src/index/index_v1.c
similarity index 100%
rename from src/index_v1.c
rename to src/index/index_v1.c
diff --git a/src/index/index_v2.c b/src/index/index_v2.c
new file mode 100644
index 0000000..aef0987
--- /dev/null
+++ b/src/index/index_v2.c
@@ -0,0 +1,120 @@
+/*
+ * This file is part of the Aaru Data Preservation Suite.
+ * Copyright (c) 2019-2025 Natalia Portillo.
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "aaruformat.h"
+#include "utarray.h"
+
+UT_array *process_index_v2(aaruformatContext *ctx)
+{
+    UT_array  *index_entries = NULL;
+    IndexEntry entry;
+
+    if(ctx == NULL || ctx->imageStream == NULL) return NULL;
+
+    // Initialize the index entries array
+    UT_icd index_entry_icd = {sizeof(IndexEntry), NULL, NULL, NULL};
+
+    utarray_new(index_entries, &index_entry_icd);
+
+    // Read the index header
+    fseek(ctx->imageStream, ctx->header.indexOffset, SEEK_SET);
+    IndexHeader2 idx_header;
+    fread(&idx_header, sizeof(IndexHeader2), 1, ctx->imageStream);
+
+    // Check if the index header is valid
+    if(idx_header.identifier != IndexBlock2)
+    {
+        fprintf(stderr, "Incorrect index identifier.\n");
+        utarray_free(index_entries);
+        return NULL;
+    }
+
+    for(int i = 0; i < idx_header.entries; i++)
+    {
+        fread(&entry, sizeof(IndexEntry), 1, ctx->imageStream);
+        utarray_push_back(index_entries, &entry);
+    }
+
+    return index_entries;
+}
+
+int32_t verify_index_v2(aaruformatContext *ctx)
+{
+    size_t      read_bytes = 0;
+    IndexHeader index_header;
+    uint64_t    crc64         = 0;
+    IndexEntry *index_entries = NULL;
+
+    if(ctx == NULL || ctx->imageStream == NULL) return AARUF_ERROR_NOT_AARUFORMAT;
+
+    // This will traverse all blocks and check their CRC64 without uncompressing them
+    fprintf(stderr, "Checking index integrity at %llu.\n", ctx->header.indexOffset);
+    fseek(ctx->imageStream, ctx->header.indexOffset, SEEK_SET);
+
+    // Read the index header
+    read_bytes = fread(&index_header, 1, sizeof(IndexHeader2), ctx->imageStream);
+
+    if(read_bytes != sizeof(IndexHeader2))
+    {
+        fprintf(stderr, "Could not read index header.\n");
+        return AARUF_ERROR_CANNOT_READ_HEADER;
+    }
+
+    if(index_header.identifier != IndexBlock)
+    {
+        fprintf(stderr, "Incorrect index identifier.\n");
+        return AARUF_ERROR_CANNOT_READ_INDEX;
+    }
+
+    fprintf(stderr, "Index at %llu contains %d entries.\n", ctx->header.indexOffset, index_header.entries);
+
+    index_entries = malloc(sizeof(IndexEntry) * index_header.entries);
+
+    if(index_entries == NULL)
+    {
+        fprintf(stderr, "Cannot allocate memory for index entries.\n");
+        return AARUF_ERROR_NOT_ENOUGH_MEMORY;
+    }
+
+    read_bytes = fread(index_entries, 1, sizeof(IndexEntry) * index_header.entries, ctx->imageStream);
+
+    if(read_bytes != sizeof(IndexEntry) * index_header.entries)
+    {
+        fprintf(stderr, "Could not read index entries.\n");
+        free(index_entries);
+        return AARUF_ERROR_CANNOT_READ_INDEX;
+    }
+
+    crc64 = aaruf_crc64_data((const uint8_t *)index_entries, sizeof(IndexEntry) * index_header.entries);
+
+    // Due to how C# wrote it, it is effectively reversed
+    if(ctx->header.imageMajorVersion <= AARUF_VERSION) crc64 = bswap_64(crc64);
+
+    if(crc64 != index_header.crc64)
+    {
+        fprintf(stderr, "Expected index CRC 0x%16llX but got 0x%16llX.\n", index_header.crc64, crc64);
+        free(index_entries);
+        return AARUF_ERROR_INVALID_BLOCK_CRC;
+    }
+
+    return AARUF_STATUS_OK;
+}
\ No newline at end of file
diff --git a/src/open.c b/src/open.c
index 32b029d..8ccce9e 100644
--- a/src/open.c
+++ b/src/open.c
@@ -152,7 +152,7 @@ void *aaruf_open(const char *filepath)
 
     readBytes = fread(&signature, 1, sizeof(uint32_t), ctx->imageStream);
 
-    if(readBytes != sizeof(uint32_t) || signature != IndexBlock)
+    if(readBytes != sizeof(uint32_t) || (signature != IndexBlock && signature != IndexBlock2))
     {
         free(ctx);
         errno = AARUF_ERROR_CANNOT_READ_INDEX;
@@ -160,7 +160,10 @@ void *aaruf_open(const char *filepath)
         return NULL;
     }
 
-    index_entries = process_index_v1(ctx);
+    if(signature == IndexBlock)
+        index_entries = process_index_v1(ctx);
+    else if(signature == IndexBlock2)
+        index_entries = process_index_v2(ctx);
 
     if(index_entries == NULL)
     {
diff --git a/src/verify.c b/src/verify.c
index 69828e2..be65a24 100644
--- a/src/verify.c
+++ b/src/verify.c
@@ -55,14 +55,17 @@ int32_t aaruf_verify_image(void *context)
         return AARUF_ERROR_CANNOT_READ_HEADER;
     }
 
-    if(signature != IndexBlock)
+    if(signature != IndexBlock && signature != IndexBlock2)
     {
         fprintf(stderr, "Incorrect index signature.\n");
         return AARUF_ERROR_CANNOT_READ_INDEX;
     }
 
     // Check if the index is correct
-    err = verify_index_v1(ctx);
+    if(signature == IndexBlock)
+        err = verify_index_v1(ctx);
+    else if(signature == IndexBlock2)
+        err = verify_index_v2(ctx);
 
     if(err != AARUF_STATUS_OK)
     {
@@ -71,7 +74,10 @@ int32_t aaruf_verify_image(void *context)
     }
 
     // Process the index
-    index_entries = process_index_v1(ctx);
+    if(signature == IndexBlock)
+        index_entries = process_index_v1(ctx);
+    else if(signature == IndexBlock2)
+        index_entries = process_index_v2(ctx);
 
     if(index_entries == NULL)
     {