diff --git a/barretenberg/cpp/barretenberg_srs_test_crs_bn254/bn254_g1.dat b/barretenberg/cpp/barretenberg_srs_test_crs_bn254/bn254_g1.dat
new file mode 100644
index 000000000000..55ee516a4fc5
Binary files /dev/null and b/barretenberg/cpp/barretenberg_srs_test_crs_bn254/bn254_g1.dat differ
diff --git a/barretenberg/cpp/barretenberg_srs_test_crs_bn254/crs.lock b/barretenberg/cpp/barretenberg_srs_test_crs_bn254/crs.lock
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/barretenberg/cpp/src/barretenberg/crypto/sha256/sha256.cpp b/barretenberg/cpp/src/barretenberg/crypto/sha256/sha256.cpp
index d79d689ec02f..848bb18ddb3e 100644
--- a/barretenberg/cpp/src/barretenberg/crypto/sha256/sha256.cpp
+++ b/barretenberg/cpp/src/barretenberg/crypto/sha256/sha256.cpp
@@ -194,5 +194,6 @@ template Sha256Hash sha256<std::vector<uint8_t>>(const std::vector<uint8_t>& inp
 template Sha256Hash sha256<std::array<uint8_t, 32>>(const std::array<uint8_t, 32>& input);
 template Sha256Hash sha256<std::string>(const std::string& input);
 template Sha256Hash sha256<std::span<uint8_t>>(const std::span<uint8_t>& input);
+template Sha256Hash sha256<std::span<const uint8_t>>(const std::span<const uint8_t>& input);
 
 } // namespace bb::crypto
diff --git a/barretenberg/cpp/src/barretenberg/srs/factories/bn254_crs_hashes.hpp b/barretenberg/cpp/src/barretenberg/srs/factories/bn254_crs_hashes.hpp
new file mode 100644
index 000000000000..cc0cacc7ca53
--- /dev/null
+++ b/barretenberg/cpp/src/barretenberg/srs/factories/bn254_crs_hashes.hpp
@@ -0,0 +1,347 @@
+#pragma once
+#include "barretenberg/common/thread.hpp"
+#include "barretenberg/common/throw_or_abort.hpp"
+#include "barretenberg/crypto/sha256/sha256.hpp"
+#include <array>
+#include <atomic>
+#include <cstddef>
+#include <cstdint>
+#include <span>
+#include <string>
+#include <vector>
+
+namespace bb::srs {
+
+/**
+ * @brief SHA256 hashes for integrity verification of downloaded BN254 CRS G1 data.
+ *
+ * @details The CRS file is divided into 8MB (8,388,608 byte) chunks. Each entry contains
+ * the SHA256 hash of the corresponding chunk. Downloads are rounded up to 8MB boundaries
+ * so that every downloaded chunk can be fully verified.
+ *
+ * Source file: bn254_g1.dat (2147483712 bytes, 33554433 G1 points)
+ * Chunk size: 8388608 bytes (131072 points per chunk)
+ * Total chunks: 257 (256 full + 1 partial of 64 bytes)
+ *
+ * Regenerate with: barretenberg/scripts/generate_crs_hashes.sh
+ */
+constexpr size_t CRS_HASH_CHUNK_SIZE = 8388608;
+constexpr size_t CRS_NUM_CHUNK_HASHES = 257;
+// Number of full 8MB chunks in the CRS (the last chunk is only 64 bytes).
+constexpr size_t CRS_NUM_FULL_CHUNKS = 256;
+
+// clang-format off
+inline const std::array<crypto::Sha256Hash, 257> BN254_CRS_CHUNK_HASHES = {{
+    { 0x37, 0x18, 0xff, 0xbe, 0xd5, 0x83, 0xd8, 0xa2, 0x79, 0xcc, 0xb2, 0x54, 0x51, 0x96, 0xd5, 0x61, 0x8e, 0x3f, 0xd9, 0x75, 0x12, 0xb6, 0x5a, 0xa0, 0x51, 0xd2, 0xeb, 0xd0, 0xf5, 0x7f, 0xb9, 0x99 },
+    { 0x76, 0x64, 0x32, 0xec, 0xe7, 0xcc, 0x4e, 0x80, 0x4b, 0x4e, 0x09, 0xdc, 0x57, 0xd3, 0xc1, 0x04, 0x82, 0x39, 0xd2, 0xe8, 0xa4, 0x16, 0xeb, 0x16, 0x91, 0x9c, 0x80, 0xa9, 0x18, 0xa3, 0xb5, 0xfd },
+    { 0x94, 0x41, 0x49, 0x1e, 0xac, 0xea, 0xdc, 0x6a, 0xa2, 0x63, 0x5d, 0x6f, 0xf1, 0x6f, 0x73, 0x97, 0x76, 0x80, 0x5e, 0xb1, 0xa4, 0xce, 0x77, 0x0d, 0xca, 0xd0, 0x82, 0xec, 0x93, 0x33, 0xbf, 0x9b },
+    { 0xc4, 0x2a, 0xef, 0xb8, 0xf7, 0x2c, 0xf5, 0xd7, 0xc4, 0xe4, 0x90, 0x0a, 0x14, 0x10, 0x67, 0x11, 0xed, 0xe3, 0x65, 0x76, 0x15, 0x94, 0x9d, 0x17, 0xd5, 0xe7, 0x17, 0x92, 0xf6, 0x21, 0xe4, 0xdb },
+    { 0x33, 0x08, 0x56, 0x42, 0x28, 0x38, 0x90, 0xeb, 0xe1, 0xd4, 0x2d, 0xf4, 0xf2, 0x85, 0x73, 0x82, 0x22, 0xd6, 0x3d, 0xf3, 0x19, 0x08, 0xaf, 0xe9, 0x3a, 0x13, 0xcf, 0x9d, 0xff, 0x62, 0x70, 0xa9 },
+    { 0x95, 0xf2, 0x93, 0xf2, 0x30, 0x92, 0x08, 0x1a, 0xfd, 0x73, 0x1c, 0xf4, 0x90, 0x4e, 0x0f, 0x0a, 0x70, 0x5e, 0x1f, 0x5d, 0x53, 0x24, 0x9e, 0xee, 0x67, 0x40, 0x1c, 0x60, 0x70, 0xef, 0x32, 0x7d },
+    { 0x04, 0xd2, 0x3e, 0xb3, 0xe4, 0x45, 0x6f, 0x71, 0x41, 0x3c, 0xcc, 0x51, 0x86, 0x7c, 0x0a, 0x57, 0x15, 0xfc, 0xe4, 0x78, 0x26, 0xf5, 0xf5, 0xdd, 0xa7, 0x2a, 0xbb, 0x4f, 0xfd, 0xa0, 0x72, 0x79 },
+    { 0xf3, 0x6a, 0x99, 0xbe, 0xac, 0x7d, 0xec, 0x7b, 0x46, 0x07, 0x37, 0x6d, 0x8e, 0xdd, 0xbc, 0x99, 0x15, 0x7a, 0x4a, 0x59, 0xf7, 0x5e, 0xac, 0x98, 0x87, 0x0f, 0x07, 0xac, 0x54, 0xdb, 0xf2, 0x12 },
+    { 0x7b, 0xfd, 0xa8, 0x24, 0x41, 0xab, 0x5e, 0x00, 0xc2, 0xcb, 0x06, 0x13, 0x8e, 0xf4, 0x93, 0xc8, 0x9d, 0x94, 0xe9, 0x71, 0x19, 0xa3, 0xb1, 0x46, 0x33, 0x9c, 0xd3, 0x35, 0x04, 0x9a, 0xeb, 0x63 },
+    { 0x45, 0xf4, 0xa4, 0x61, 0x23, 0xc4, 0x34, 0xb7, 0x80, 0x0f, 0x6b, 0x36, 0xae, 0xf4, 0x3e, 0x28, 0xe6, 0x36, 0xdf, 0x87, 0x15, 0x86, 0x93, 0xf4, 0xbb, 0x9d, 0x88, 0xb5, 0xc9, 0x36, 0x4c, 0xd7 },
+    { 0x16, 0x41, 0xc3, 0x00, 0x5f, 0x43, 0x4d, 0x8e, 0xc3, 0xf0, 0x4a, 0x1a, 0x5c, 0x94, 0xf6, 0x60, 0x96, 0x62, 0xf1, 0x03, 0x7c, 0x49, 0x04, 0x1d, 0x47, 0x7c, 0x6e, 0x17, 0xc7, 0x3b, 0x17, 0x92 },
+    { 0xbe, 0x89, 0xb5, 0x7a, 0xd5, 0x08, 0x93, 0x19, 0x77, 0xaa, 0x22, 0x50, 0x50, 0x95, 0x0d, 0x67, 0x67, 0xeb, 0x2f, 0x9f, 0x96, 0x2a, 0x19, 0x6a, 0x9a, 0x11, 0x45, 0x2c, 0x73, 0xd6, 0xec, 0x1b },
+    { 0xc4, 0x86, 0x38, 0xfc, 0x95, 0x37, 0x01, 0x56, 0x09, 0x2d, 0x5c, 0x4d, 0x0b, 0x99, 0x8c, 0x16, 0x1c, 0x3e, 0x3d, 0x48, 0x2a, 0x16, 0xc1, 0xd9, 0xc8, 0xd2, 0x87, 0xa9, 0x4e, 0xb0, 0x49, 0x10 },
+    { 0x9c, 0x99, 0xa4, 0xf4, 0xbb, 0xa4, 0xba, 0x9f, 0x52, 0x41, 0x17, 0x78, 0x0d, 0x3f, 0x04, 0x3d, 0xbf, 0xeb, 0xee, 0x92, 0x4d, 0xc1, 0x52, 0x68, 0xc1, 0xf4, 0x9c, 0x6e, 0x40, 0xf1, 0x16, 0x35 },
+    { 0x64, 0x2f, 0xc5, 0x9b, 0xd6, 0x11, 0xe7, 0x7c, 0x2b, 0x97, 0xb5, 0x87, 0x85, 0x40, 0x43, 0x4f, 0xfc, 0x6b, 0x75, 0xd9, 0x51, 0x25, 0x59, 0x34, 0x66, 0xbc, 0xe6, 0x77, 0x08, 0x33, 0x6c, 0x74 },
+    { 0x46, 0x23, 0x19, 0x98, 0x71, 0xba, 0x5c, 0xc3, 0x1d, 0x37, 0xce, 0xe1, 0x01, 0xc1, 0x2e, 0xb3, 0x96, 0xf6, 0xe4, 0x53, 0x7c, 0x89, 0x96, 0xa0, 0xbe, 0x0c, 0x43, 0xe3, 0x65, 0xfc, 0xaa, 0x7c },
+    { 0xf3, 0x3c, 0x73, 0xc4, 0x86, 0x7c, 0xe1, 0x63, 0x1c, 0x89, 0xeb, 0x83, 0x06, 0x79, 0x8f, 0x7b, 0xec, 0x27, 0xd1, 0x8b, 0x1b, 0x23, 0x1f, 0x37, 0x01, 0xbf, 0xc0, 0xa7, 0x2b, 0x44, 0x95, 0x5d },
+    { 0x5a, 0x93, 0x51, 0xf3, 0x82, 0xaf, 0x1e, 0x80, 0x42, 0xb2, 0xe2, 0xf3, 0x1d, 0x80, 0xe6, 0xe4, 0x4c, 0xe0, 0xaf, 0xdd, 0x71, 0x86, 0xc7, 0x6a, 0x28, 0x38, 0x4f, 0x85, 0xf9, 0x68, 0x68, 0x9b },
+    { 0x2a, 0x39, 0x1b, 0xe1, 0x84, 0x8a, 0xe2, 0x80, 0x54, 0xdc, 0x67, 0x78, 0xe2, 0x23, 0x44, 0x9f, 0x38, 0xdf, 0x40, 0xf2, 0x1a, 0x69, 0x80, 0x51, 0x3c, 0xba, 0x00, 0xde, 0xa8, 0x55, 0x25, 0x05 },
+    { 0xca, 0x1b, 0xee, 0x70, 0x4c, 0x89, 0xb2, 0xcf, 0xba, 0xac, 0xe7, 0xfc, 0xf0, 0xed, 0xec, 0x60, 0x13, 0x95, 0xa1, 0xd2, 0x0d, 0xe2, 0x38, 0x4e, 0xd1, 0x62, 0x3d, 0x4e, 0x23, 0xce, 0xda, 0xd9 },
+    { 0x6a, 0x22, 0x81, 0x77, 0xcd, 0x17, 0x2a, 0x14, 0x7d, 0x10, 0x50, 0xb6, 0xb4, 0xb9, 0x5d, 0xcb, 0xc2, 0xbc, 0xfc, 0xf7, 0x94, 0x6a, 0x1e, 0xbf, 0x26, 0xe8, 0x11, 0xfb, 0xe1, 0x68, 0x6a, 0xc7 },
+    { 0x6c, 0xa0, 0xd3, 0x55, 0xa6, 0xa7, 0x7a, 0x41, 0xb8, 0x52, 0xd9, 0x37, 0xc1, 0xe5, 0x55, 0xae, 0xf4, 0x11, 0xc8, 0x9f, 0xe9, 0x72, 0x9e, 0x2b, 0x97, 0x14, 0xd6, 0x4b, 0x02, 0xda, 0x5c, 0x6d },
+    { 0x32, 0x38, 0x0e, 0xc8, 0x68, 0x00, 0x68, 0x9a, 0xeb, 0x8b, 0xf8, 0x25, 0x89, 0xcf, 0x7e, 0xe1, 0x62, 0xb7, 0x63, 0x4e, 0x02, 0x9b, 0xe3, 0xac, 0x0c, 0x42, 0xbc, 0x08, 0x8b, 0xa9, 0x5c, 0x74 },
+    { 0xa9, 0x39, 0xe2, 0x3a, 0xf2, 0x37, 0x55, 0xcb, 0x46, 0x28, 0xce, 0xba, 0x8e, 0x54, 0x6e, 0x49, 0xdf, 0xd6, 0x4d, 0xa9, 0x29, 0x13, 0x73, 0x18, 0x17, 0x51, 0xad, 0xa5, 0x30, 0xb3, 0x14, 0x6a },
+    { 0xa4, 0xcb, 0x65, 0x63, 0x5b, 0x86, 0x84, 0x63, 0x30, 0x23, 0xed, 0x99, 0xbc, 0x24, 0x69, 0xa0, 0xb7, 0xf3, 0xda, 0x9c, 0xb2, 0xf5, 0x26, 0xfc, 0x48, 0xf4, 0x7b, 0x55, 0x52, 0x26, 0x87, 0xe5 },
+    { 0xf7, 0x6b, 0xe9, 0xb9, 0x1a, 0x4d, 0xfd, 0x96, 0xc4, 0x1f, 0x1f, 0x37, 0x38, 0x4e, 0x46, 0x02, 0xbe, 0x26, 0x8b, 0xde, 0x63, 0x0a, 0x38, 0x1a, 0xd5, 0xe4, 0xc0, 0x02, 0xd1, 0x9f, 0x53, 0x33 },
+    { 0x0d, 0x4a, 0x07, 0x56, 0x39, 0x6b, 0x3c, 0x5b, 0xe3, 0xfc, 0x3c, 0xf7, 0xc7, 0xa3, 0x8d, 0xfc, 0x3e, 0xd8, 0xc3, 0x68, 0x81, 0xcc, 0x50, 0x06, 0x8b, 0x15, 0x99, 0xe0, 0xe3, 0x40, 0x04, 0x4f },
+    { 0x6f, 0xba, 0xdf, 0x0b, 0xa5, 0xb3, 0x55, 0xbf, 0x3f, 0x29, 0x67, 0xf2, 0x30, 0x52, 0xd8, 0x5e, 0x5a, 0x4d, 0xba, 0x05, 0x17, 0xb3, 0x34, 0x94, 0x98, 0x8d, 0x4f, 0xcb, 0xbd, 0x6b, 0xb7, 0xb6 },
+    { 0x56, 0xba, 0xbf, 0x37, 0x0b, 0x5b, 0xd0, 0x6f, 0x66, 0x78, 0x40, 0xe1, 0x16, 0x27, 0xba, 0x31, 0xa1, 0xa2, 0xc3, 0xb2, 0x03, 0x33, 0x94, 0xd0, 0xcb, 0x33, 0x77, 0x54, 0xb3, 0xc8, 0x51, 0xc5 },
+    { 0x4f, 0x61, 0xf8, 0xa5, 0x57, 0x13, 0x98, 0x05, 0x15, 0x5e, 0xd9, 0xc9, 0x15, 0xa9, 0x8a, 0x86, 0x1d, 0xad, 0xe7, 0x73, 0x55, 0xd1, 0x95, 0xbd, 0x7f, 0x9b, 0x9c, 0xa2, 0x00, 0xd9, 0xaf, 0x2e },
+    { 0xb2, 0xbc, 0x21, 0x4c, 0x39, 0xcb, 0x44, 0x4e, 0x57, 0x48, 0xc8, 0xe5, 0xc4, 0x7a, 0xd9, 0xe6, 0x6a, 0x01, 0xac, 0xfc, 0x69, 0x1c, 0x45, 0x71, 0xa3, 0x6c, 0xf7, 0x43, 0x11, 0x14, 0x49, 0x18 },
+    { 0xff, 0x82, 0xf0, 0xa6, 0x0f, 0x47, 0x10, 0x1b, 0x2a, 0x0c, 0xc6, 0x56, 0x53, 0xfa, 0x2b, 0xce, 0xdd, 0xd7, 0x58, 0xba, 0x75, 0xc4, 0xf4, 0xbd, 0xd7, 0xde, 0xcb, 0x10, 0xe7, 0x05, 0xbf, 0x69 },
+    { 0xea, 0xaa, 0xe0, 0x47, 0xb3, 0xc1, 0xc4, 0xb8, 0x4d, 0xec, 0xc3, 0x19, 0xe6, 0x4b, 0x0a, 0x9f, 0x1d, 0x78, 0xbf, 0x96, 0x79, 0x83, 0x16, 0xeb, 0x40, 0xc8, 0xb3, 0x84, 0x40, 0x02, 0x8b, 0x4e },
+    { 0xdf, 0xde, 0x1a, 0xde, 0x2e, 0xda, 0xdd, 0xc9, 0xd9, 0x62, 0x97, 0x88, 0x11, 0x83, 0xc2, 0x56, 0xe0, 0x52, 0xf5, 0x69, 0xcc, 0xa3, 0x28, 0xd0, 0x12, 0x29, 0xb8, 0x17, 0x17, 0xbf, 0xf4, 0x1e },
+    { 0x2b, 0xcf, 0x6f, 0x27, 0x65, 0x4e, 0x2f, 0x09, 0xcb, 0xd4, 0x7c, 0xf6, 0xf1, 0x24, 0xcb, 0x3b, 0x72, 0x41, 0x4e, 0xb4, 0x5a, 0xd0, 0x03, 0x32, 0x63, 0x2e, 0x3e, 0xbc, 0x80, 0x6a, 0x6c, 0x6f },
+    { 0xb9, 0x57, 0x02, 0xea, 0x42, 0x68, 0xe2, 0xf2, 0x3a, 0xb1, 0x62, 0x53, 0xcf, 0x19, 0xf7, 0xbe, 0xdf, 0xd4, 0xa6, 0x4f, 0x4f, 0x92, 0x87, 0x1b, 0xbb, 0xb7, 0xf4, 0x7c, 0x61, 0x5e, 0x9d, 0x8b },
+    { 0xe6, 0x48, 0x3a, 0x34, 0x2f, 0x00, 0xed, 0xa4, 0x4f, 0x1d, 0x6f, 0xcb, 0xdb, 0x02, 0x8e, 0x92, 0x51, 0x27, 0xa1, 0x9b, 0x87, 0x67, 0x2d, 0x44, 0x75, 0x4a, 0x62, 0x90, 0x96, 0x93, 0xe5, 0x08 },
+    { 0x74, 0x0b, 0x38, 0x19, 0xb3, 0x63, 0xdc, 0xcf, 0xb5, 0x91, 0x06, 0x86, 0x18, 0xef, 0x32, 0x57, 0x4e, 0xc9, 0xbd, 0x6e, 0x00, 0xe8, 0xde, 0xdb, 0x36, 0xf6, 0xbe, 0x1a, 0xc9, 0xe6, 0x9c, 0x05 },
+    { 0x20, 0x79, 0x64, 0xfc, 0x7b, 0xc1, 0x6c, 0x78, 0x76, 0x4b, 0xec, 0xca, 0x58, 0x57, 0x64, 0x3b, 0xe4, 0xde, 0x2d, 0xfb, 0xa1, 0x55, 0x98, 0x67, 0x79, 0x67, 0x30, 0x0e, 0xbe, 0xd8, 0x82, 0xfe },
+    { 0xc9, 0x91, 0xde, 0x9d, 0xa1, 0xea, 0x37, 0x7b, 0x9d, 0x01, 0xb7, 0x56, 0xbb, 0x97, 0x64, 0xa0, 0x56, 0x50, 0x0b, 0x36, 0x4d, 0x13, 0x00, 0xc1, 0x42, 0x76, 0x55, 0x76, 0xae, 0x31, 0x15, 0x74 },
+    { 0xa5, 0xe4, 0x0e, 0x2a, 0x9b, 0x93, 0x64, 0x33, 0x34, 0x28, 0x38, 0xd6, 0x4f, 0x36, 0xc3, 0xf6, 0x6e, 0xc0, 0xd1, 0x06, 0x03, 0x0f, 0x90, 0xf0, 0x90, 0xe9, 0x00, 0xae, 0x83, 0xe7, 0x8b, 0x97 },
+    { 0x28, 0x29, 0xcc, 0x04, 0x80, 0xf3, 0xaf, 0xef, 0xb8, 0x44, 0xea, 0x17, 0x7b, 0x25, 0xd3, 0x60, 0xd6, 0x5c, 0xd3, 0x17, 0x0e, 0xc5, 0xbd, 0x3a, 0x4b, 0xb9, 0x7b, 0x9c, 0x6e, 0xbe, 0x0f, 0xc8 },
+    { 0x34, 0xf3, 0x3b, 0x9a, 0x20, 0x09, 0x78, 0x1c, 0x6c, 0x6f, 0x05, 0x3c, 0x6a, 0x94, 0xf8, 0x17, 0xab, 0x8f, 0xda, 0xd9, 0x1a, 0x8c, 0x8e, 0x4f, 0x8c, 0x49, 0x87, 0xa6, 0xb3, 0xf0, 0x6f, 0xc8 },
+    { 0x62, 0xb7, 0x84, 0x4f, 0xa7, 0xb7, 0x01, 0xdf, 0x83, 0x0f, 0x6b, 0x76, 0x72, 0x76, 0x0b, 0xc8, 0x91, 0x05, 0x46, 0x76, 0x0e, 0x8b, 0x0e, 0xcf, 0x8f, 0x69, 0x36, 0x56, 0xa8, 0x12, 0x0b, 0x5b },
+    { 0x93, 0x30, 0x76, 0x10, 0xfa, 0x9e, 0x6f, 0x45, 0x1c, 0xe0, 0xb8, 0x7c, 0x8b, 0x03, 0x20, 0xb7, 0x46, 0x49, 0x51, 0x5e, 0x86, 0xb9, 0x04, 0xa7, 0xeb, 0x3d, 0x43, 0xa7, 0xf6, 0xa6, 0x50, 0x43 },
+    { 0x4c, 0x90, 0x64, 0xf5, 0x57, 0xd7, 0x08, 0x96, 0x7b, 0x59, 0x94, 0x83, 0x3e, 0x6f, 0x4b, 0xd7, 0x43, 0x76, 0xd9, 0xb4, 0xee, 0xa1, 0xf9, 0xdd, 0xe5, 0x5e, 0x9a, 0x4d, 0xb8, 0xf9, 0x3d, 0xc7 },
+    { 0x13, 0x69, 0xc1, 0x8c, 0x24, 0x33, 0x94, 0x77, 0x5f, 0x64, 0x88, 0x53, 0x2c, 0x3d, 0x9a, 0xec, 0xcc, 0xb2, 0x05, 0x1d, 0x49, 0x6c, 0x3b, 0x7e, 0xeb, 0xc8, 0xa2, 0x4d, 0x6c, 0x0e, 0xa8, 0xfa },
+    { 0xd2, 0x92, 0x6f, 0x1e, 0x75, 0x3f, 0x93, 0x34, 0x7a, 0x89, 0xb2, 0xe9, 0x12, 0x0c, 0xc6, 0x35, 0xff, 0x2a, 0x40, 0xe9, 0xe8, 0xaf, 0x8a, 0xc1, 0x2e, 0xdc, 0x6e, 0x3c, 0x72, 0x98, 0xd9, 0x88 },
+    { 0xa0, 0xbc, 0x2d, 0x5b, 0x29, 0x3e, 0x68, 0xbe, 0x4c, 0x92, 0x19, 0xe7, 0x8b, 0xc3, 0xec, 0xed, 0x6c, 0xbd, 0xaf, 0xfb, 0x5f, 0x83, 0x31, 0x34, 0x97, 0xc1, 0xe4, 0xa6, 0x24, 0x0e, 0x14, 0x47 },
+    { 0x60, 0x61, 0x4a, 0xb9, 0x54, 0x7a, 0x38, 0xe8, 0x2b, 0xf9, 0x06, 0xd0, 0x8f, 0x07, 0x63, 0x15, 0xff, 0xed, 0xc7, 0x43, 0x2a, 0xaf, 0x29, 0xf4, 0x43, 0x81, 0xa5, 0xa4, 0xdd, 0x3e, 0xc7, 0xc3 },
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+    { 0x49, 0x07, 0x80, 0x52, 0xa5, 0x9f, 0xca, 0x9a, 0xf2, 0x24, 0x67, 0x0c, 0xac, 0xb9, 0x02, 0xf1, 0x0a, 0xe8, 0x0a, 0xe8, 0xc4, 0x9a, 0x89, 0x1b, 0x88, 0x3f, 0x73, 0xa8, 0x57, 0xd2, 0x89, 0x1d },
+    { 0x46, 0xe0, 0x8f, 0xa8, 0xf2, 0x42, 0x9a, 0xd8, 0xb6, 0x9b, 0x2a, 0xc9, 0x06, 0x08, 0xc2, 0x6f, 0x9e, 0x45, 0x65, 0x8a, 0x86, 0x2d, 0x57, 0xfd, 0xa7, 0xd4, 0xd3, 0x5a, 0xa6, 0xb9, 0x72, 0x98 },
+    { 0x93, 0x75, 0xb1, 0xff, 0xfd, 0x57, 0xa2, 0xcd, 0x6d, 0x3a, 0x33, 0xd4, 0xc7, 0x02, 0xb0, 0xba, 0xb5, 0xf3, 0xb6, 0x35, 0x0d, 0x95, 0x1b, 0x4f, 0x0c, 0xea, 0x40, 0x79, 0x45, 0x16, 0x3e, 0x48 },
+    { 0x9e, 0xd4, 0x4c, 0xac, 0xea, 0x56, 0xab, 0xbe, 0xcb, 0x78, 0x76, 0xa7, 0xd8, 0x87, 0x66, 0xfc, 0x2e, 0xe0, 0x43, 0xb3, 0x69, 0xfb, 0x0a, 0xaf, 0x5d, 0x29, 0xd6, 0x7d, 0x0a, 0xea, 0x36, 0xa2 },
+    { 0x94, 0x8a, 0xca, 0xa5, 0xa8, 0xa8, 0x44, 0x0d, 0x4d, 0x7a, 0x73, 0x97, 0xe7, 0x47, 0x84, 0xf3, 0x81, 0x87, 0xe1, 0xb2, 0x37, 0x00, 0xae, 0x29, 0xa6, 0x78, 0xc3, 0x1a, 0x60, 0x1d, 0x13, 0xc1 },
+    { 0x01, 0x9a, 0x25, 0x5a, 0x28, 0x5d, 0xea, 0x68, 0x20, 0x1b, 0x20, 0xc0, 0x4e, 0xa3, 0xd4, 0x12, 0xf5, 0x33, 0x9c, 0xb9, 0x22, 0xfe, 0x5d, 0xfe, 0xbd, 0xc1, 0x87, 0x31, 0xdb, 0x8e, 0x9b, 0xa4 },
+    { 0xb7, 0xcc, 0x1c, 0x62, 0xbc, 0x62, 0xcc, 0x3f, 0xb0, 0xaa, 0x7c, 0xba, 0x61, 0x1e, 0x03, 0xa2, 0x76, 0x8b, 0x6d, 0xe5, 0x0e, 0x80, 0x63, 0x85, 0x29, 0x23, 0xf8, 0x77, 0xda, 0xf9, 0x45, 0xd6 },
+    { 0x87, 0x11, 0xc8, 0xac, 0x5a, 0xf3, 0xa8, 0xbb, 0x31, 0x33, 0x51, 0xa7, 0x68, 0x4c, 0x88, 0x78, 0xc1, 0xbc, 0xed, 0x94, 0xce, 0x12, 0xef, 0x81, 0x17, 0x02, 0xa6, 0xc7, 0x3a, 0x79, 0x12, 0xe4 },
+    { 0x33, 0xca, 0xb9, 0x14, 0xdf, 0xe8, 0xae, 0xe0, 0xdc, 0xaa, 0xb2, 0x29, 0x29, 0xf2, 0x0c, 0x3d, 0xba, 0x22, 0x1c, 0x73, 0x21, 0xd4, 0x8e, 0x7f, 0x72, 0x36, 0xb6, 0xbf, 0x65, 0xc2, 0xf8, 0x34 },
+    { 0xe5, 0xbc, 0xaf, 0x0d, 0xde, 0x3e, 0x00, 0x52, 0x2f, 0x61, 0x27, 0x77, 0x37, 0x3f, 0x08, 0xcd, 0x1c, 0x31, 0xa6, 0x5d, 0x50, 0x53, 0x02, 0x2f, 0x44, 0xc0, 0x94, 0xe9, 0x1b, 0xc6, 0xae, 0xdc },
+    { 0xcf, 0x6b, 0x59, 0xce, 0x96, 0x5f, 0xdd, 0xf6, 0xb0, 0x29, 0xfa, 0xef, 0x65, 0x59, 0xc2, 0x93, 0xae, 0x7c, 0xe5, 0xec, 0xc7, 0x79, 0xb6, 0x87, 0xb9, 0xf3, 0x49, 0x3e, 0x64, 0x65, 0x58, 0xdd },
+    { 0x6d, 0xf1, 0x3c, 0x6a, 0xe4, 0x34, 0x47, 0x13, 0x85, 0x16, 0x68, 0x1a, 0x50, 0xe5, 0x74, 0xbc, 0xe0, 0xa6, 0x8f, 0x3f, 0x14, 0x68, 0x5d, 0xf1, 0xe5, 0x04, 0x5b, 0x3a, 0xd1, 0x4b, 0x01, 0xd6 },
+    { 0x97, 0x93, 0xea, 0x3d, 0x7d, 0x66, 0xc4, 0xf4, 0x37, 0x3b, 0xc1, 0x97, 0x09, 0xc9, 0xc5, 0x5d, 0xe5, 0x62, 0xde, 0x7e, 0x43, 0xa0, 0xb2, 0x33, 0x11, 0x7d, 0xc0, 0x6c, 0x55, 0xa6, 0xa4, 0x18 },
+    { 0x02, 0x32, 0x50, 0x80, 0x99, 0x3c, 0xfa, 0x25, 0x37, 0x93, 0x11, 0xd5, 0x2e, 0x03, 0x1a, 0xb2, 0x7d, 0xc3, 0x06, 0xd7, 0x04, 0xc0, 0xd3, 0x3c, 0xcb, 0x6e, 0x32, 0x12, 0xcc, 0x08, 0x67, 0x4c },
+    { 0xce, 0xa7, 0x08, 0xe1, 0xfd, 0x0a, 0x96, 0x03, 0x95, 0x42, 0xd9, 0x11, 0xc1, 0x6d, 0xf0, 0xc0, 0x00, 0x06, 0x2a, 0x20, 0xff, 0x42, 0x25, 0x60, 0x41, 0xfe, 0x35, 0xba, 0x08, 0x03, 0x99, 0x5e },
+    { 0xa8, 0xf8, 0xbe, 0x4a, 0x4f, 0x87, 0x1c, 0x41, 0xc5, 0xb6, 0xc8, 0x29, 0x66, 0x99, 0x07, 0x07, 0x02, 0x7a, 0x09, 0xe8, 0x7e, 0x37, 0x28, 0x4c, 0x54, 0xe8, 0x2b, 0x58, 0x86, 0xc3, 0x3f, 0xb6 },
+    { 0x47, 0xb6, 0x0e, 0x9e, 0x93, 0xeb, 0xf5, 0xae, 0xa2, 0x6d, 0x73, 0xd4, 0xba, 0xc8, 0x5a, 0xad, 0x39, 0xa5, 0xbe, 0x64, 0x54, 0x34, 0xd7, 0xeb, 0x90, 0x7a, 0xb4, 0xbe, 0xb9, 0x73, 0x88, 0x1b },
+    { 0x8d, 0x7d, 0xed, 0x77, 0x15, 0xf4, 0x79, 0x20, 0x1b, 0xd8, 0x0c, 0x15, 0x21, 0x9f, 0xea, 0x6e, 0xb9, 0xae, 0xb2, 0x9d, 0x5d, 0x94, 0x20, 0xa3, 0x71, 0x8c, 0xf6, 0x60, 0x5c, 0x64, 0xc5, 0x6c },
+    { 0xf2, 0x19, 0x2d, 0x9d, 0x51, 0x60, 0x22, 0x05, 0xcc, 0xde, 0x99, 0xfc, 0x5b, 0x18, 0x4d, 0x9d, 0x05, 0x19, 0x66, 0xd8, 0x6a, 0xbd, 0x61, 0x8f, 0xeb, 0x5c, 0x28, 0x8a, 0x59, 0xf4, 0xd2, 0x38 },
+    { 0xa4, 0xbd, 0x01, 0x7a, 0x2b, 0xab, 0x8e, 0x78, 0x8c, 0x2d, 0xf1, 0x47, 0xe7, 0xf4, 0xf2, 0xee, 0x8f, 0xce, 0x8a, 0xe5, 0xfe, 0x4c, 0xe6, 0x16, 0x94, 0xcb, 0x8f, 0xf4, 0xe1, 0x00, 0x08, 0x15 },
+    { 0xb2, 0x33, 0x51, 0x9b, 0x87, 0x23, 0x26, 0xf0, 0xfc, 0x9f, 0x9a, 0x30, 0x58, 0xf3, 0x7f, 0x61, 0xc5, 0x01, 0x1f, 0xf7, 0x3e, 0x18, 0x36, 0x48, 0xdf, 0xef, 0xef, 0xef, 0xbe, 0x26, 0x97, 0xdf },
+    { 0xa2, 0x0a, 0xf0, 0x97, 0x37, 0x0c, 0x86, 0xfb, 0x28, 0x11, 0x5e, 0x9f, 0x18, 0x49, 0x1a, 0x84, 0xd7, 0x19, 0x14, 0x3a, 0x2f, 0xda, 0xe4, 0xf6, 0xa9, 0x59, 0x11, 0xa2, 0x26, 0x9a, 0x08, 0x12 },
+    { 0x40, 0x34, 0x55, 0xd7, 0x4a, 0x4b, 0xe9, 0x90, 0xfb, 0xb5, 0x5d, 0x75, 0xc4, 0xa4, 0x04, 0x37, 0xa3, 0xd1, 0xf8, 0xa9, 0x05, 0xba, 0x89, 0xec, 0xfb, 0xc0, 0x32, 0xdf, 0x68, 0x4d, 0xda, 0xc5 },
+    { 0x4b, 0xb6, 0xb4, 0xb0, 0x89, 0x13, 0xf2, 0x60, 0x88, 0x3b, 0xb8, 0xd0, 0x92, 0x8f, 0x25, 0x3e, 0x44, 0xc5, 0x20, 0xdc, 0xc1, 0xc8, 0x58, 0xe0, 0x08, 0x29, 0xca, 0xd0, 0xb3, 0x87, 0x9e, 0xe9 },
+    { 0x57, 0xce, 0x4b, 0x96, 0xa1, 0x2b, 0xf1, 0xca, 0x26, 0x2c, 0x98, 0x33, 0x4f, 0x36, 0x70, 0xe1, 0x52, 0xa2, 0xfe, 0x28, 0xe7, 0xfd, 0xa8, 0x4f, 0xb7, 0x7c, 0xb3, 0x22, 0x9f, 0x19, 0x4b, 0xdd },
+    { 0x70, 0xad, 0xc7, 0x0d, 0xd0, 0xa2, 0x9a, 0xee, 0x66, 0xb9, 0xe4, 0x03, 0x66, 0xd3, 0x10, 0x8e, 0x85, 0x20, 0x9c, 0x04, 0x30, 0xe8, 0x69, 0x74, 0x1e, 0x2b, 0x4d, 0xb3, 0x41, 0xf1, 0xdb, 0x96 },
+    { 0x4f, 0x80, 0xee, 0x7d, 0x24, 0xe1, 0xfc, 0x73, 0x5a, 0x02, 0x85, 0x69, 0x07, 0x5b, 0x10, 0x8f, 0x82, 0x6c, 0x0c, 0xbc, 0x43, 0x93, 0x1f, 0x12, 0x96, 0xf7, 0x9c, 0x61, 0x70, 0x44, 0x56, 0xa6 },
+    { 0x57, 0x18, 0x99, 0x32, 0x14, 0x1d, 0x23, 0xa2, 0x46, 0x0e, 0xdf, 0x52, 0xb7, 0xb7, 0x4d, 0x8f, 0x2f, 0x3c, 0x07, 0x77, 0x4d, 0xb1, 0xa3, 0x83, 0x46, 0x65, 0xed, 0xd0, 0xb9, 0x7a, 0x25, 0xba },
+    { 0x7f, 0x02, 0xaa, 0x59, 0xc7, 0xbb, 0x9c, 0x68, 0xdd, 0x24, 0x3d, 0x00, 0x59, 0x40, 0x1c, 0x70, 0xb4, 0xbd, 0xd0, 0x33, 0x46, 0x4d, 0x0c, 0xcc, 0x46, 0x6a, 0xa1, 0x60, 0x8d, 0x54, 0x32, 0xc2 },
+    { 0xad, 0x99, 0xed, 0x1c, 0xe9, 0x0b, 0xb4, 0xbb, 0x87, 0x18, 0x49, 0xee, 0x3d, 0x1f, 0x25, 0x34, 0x9c, 0x31, 0xb5, 0x4f, 0x19, 0x2b, 0xc1, 0xda, 0x65, 0x4d, 0x80, 0x50, 0xdd, 0x35, 0xf7, 0xc7 },
+    { 0x80, 0x63, 0x59, 0xe2, 0x9b, 0x9c, 0x5a, 0xbe, 0xe0, 0xd0, 0xc1, 0x0b, 0xc2, 0x85, 0x5e, 0x2a, 0xd6, 0xed, 0xe3, 0x9a, 0x05, 0xe5, 0x47, 0xb0, 0x2a, 0xa0, 0x44, 0x80, 0x5a, 0xee, 0xb8, 0x09 },
+    { 0x00, 0x14, 0xec, 0x7c, 0xc5, 0x71, 0x29, 0x3f, 0x45, 0xe8, 0x5f, 0x59, 0xf4, 0x8c, 0x85, 0x03, 0xbb, 0xe9, 0x20, 0xbc, 0x0d, 0x15, 0x4a, 0x2f, 0x0a, 0x99, 0x8f, 0xc3, 0x63, 0x0d, 0xb9, 0x4c },
+    { 0xdd, 0xd7, 0xbe, 0x7d, 0xb8, 0xa3, 0xf1, 0x6f, 0x2a, 0xf8, 0x47, 0xf4, 0xc0, 0x32, 0xd4, 0x2e, 0xc1, 0xaa, 0xb5, 0x1e, 0xe8, 0x1c, 0xbb, 0x04, 0x5a, 0x0c, 0xf2, 0x16, 0xf8, 0xad, 0xae, 0xc9 },
+    { 0x7b, 0xb9, 0x30, 0x2d, 0xd4, 0xf6, 0x25, 0x0f, 0x33, 0xd3, 0x86, 0x6f, 0xdc, 0x51, 0x32, 0x70, 0x83, 0x8e, 0x91, 0xd5, 0xfa, 0xfb, 0xab, 0x02, 0xb8, 0xb0, 0xfa, 0xc4, 0x1c, 0xdc, 0x89, 0x17 },
+    { 0x1c, 0xa2, 0x9b, 0xe7, 0x4e, 0xd3, 0xcc, 0x44, 0xd0, 0x81, 0x68, 0x61, 0x24, 0x11, 0xa0, 0x9d, 0x9f, 0xb3, 0xf7, 0x13, 0x38, 0x3b, 0xef, 0x2e, 0xcc, 0x87, 0x79, 0x88, 0x73, 0x3d, 0xac, 0x25 },
+    { 0xcc, 0x17, 0x23, 0x21, 0x4e, 0x75, 0xd7, 0xc1, 0xa5, 0x47, 0xad, 0x42, 0x77, 0x85, 0x03, 0x00, 0xa2, 0xfd, 0x03, 0x24, 0x5f, 0x4d, 0x14, 0x0e, 0xd7, 0x08, 0x21, 0xf4, 0xae, 0x43, 0x28, 0xaa },
+    { 0x8a, 0xaf, 0xae, 0x77, 0x83, 0x12, 0xd3, 0xa5, 0x46, 0xad, 0x97, 0x23, 0x31, 0x7d, 0x21, 0x0d, 0x6c, 0x35, 0xcc, 0xa3, 0xa6, 0x56, 0x10, 0x1c, 0x5a, 0xc7, 0x41, 0x5a, 0xbc, 0x59, 0xad, 0x2b },
+    { 0xa3, 0xd6, 0xf2, 0xdd, 0x71, 0x96, 0xa8, 0x3f, 0xf7, 0x69, 0x35, 0x23, 0x86, 0x0f, 0xee, 0xb5, 0x16, 0x3c, 0x35, 0x7e, 0xee, 0xad, 0xf6, 0x24, 0x6c, 0x21, 0xf3, 0x3e, 0x59, 0x8e, 0x4a, 0xaa },
+    { 0x3f, 0xe6, 0xfc, 0xf8, 0x63, 0x88, 0xfb, 0x65, 0x0b, 0x28, 0x1f, 0xb7, 0xc0, 0x81, 0x61, 0x4d, 0x85, 0xa7, 0x89, 0xd7, 0x34, 0x44, 0xe5, 0x64, 0x22, 0x35, 0x89, 0x42, 0xdf, 0x5e, 0x1a, 0x6f },
+    { 0xec, 0xd8, 0xab, 0xa9, 0x5f, 0xb1, 0xdc, 0xb5, 0x08, 0x2a, 0xb5, 0xa2, 0x22, 0x64, 0xc4, 0x54, 0x3e, 0x32, 0x79, 0x59, 0x78, 0xb9, 0xfb, 0x6b, 0x5c, 0x76, 0x66, 0x35, 0xa5, 0xa2, 0xbb, 0xba },
+    { 0x2e, 0xab, 0x27, 0x1b, 0x58, 0xfe, 0xd4, 0x1b, 0xa9, 0x2f, 0x50, 0x38, 0x93, 0xb1, 0x00, 0xaf, 0x2c, 0x8f, 0xfd, 0xbe, 0x90, 0x18, 0x21, 0x41, 0xd6, 0x4f, 0x06, 0x52, 0xc6, 0xe7, 0xd5, 0x6b }
+}};
+// clang-format on
+
+/**
+ * @brief Verify downloaded CRS data against embedded SHA256 chunk hashes.
+ *
+ * @details Verifies the integrity of downloaded CRS data by checking SHA256 hashes
+ * of each 8MB chunk in parallel across available cores. Any trailing bytes smaller
+ * than a chunk are skipped.
+ * This provides integrity verification for CRS data downloaded over HTTP without
+ * requiring SSL/TLS.
+ *
+ * @param data The downloaded CRS data bytes (must be a multiple of CRS_HASH_CHUNK_SIZE)
+ * @throws If the data is not chunk-aligned or any chunk hash does not match
+ */
+inline void verify_bn254_crs_integrity(const std::vector<uint8_t>& data)
+{
+    // Verify all complete 8MB chunks. Any trailing bytes smaller than a chunk are
+    // not covered by chunk hashes (the full CRS has a 64-byte remainder after 256
+    // full chunks) and are skipped.
+    size_t num_full_chunks = data.size() / CRS_HASH_CHUNK_SIZE;
+    size_t chunks_to_verify = std::min(num_full_chunks, CRS_NUM_CHUNK_HASHES);
+    if (chunks_to_verify == 0) {
+        return;
+    }
+
+    // Track a failing chunk index across threads.
+    std::atomic<size_t> failed_chunk{ chunks_to_verify }; // sentinel = no failure
+
+    parallel_for([&](const ThreadChunk& tc) {
+        for (size_t i : tc.range(chunks_to_verify)) {
+            // Early exit if another thread already found a mismatch.
+            if (failed_chunk.load(std::memory_order_relaxed) < chunks_to_verify) {
+                return;
+            }
+            size_t offset = i * CRS_HASH_CHUNK_SIZE;
+            auto chunk = std::span<const uint8_t>(data.data() + offset, CRS_HASH_CHUNK_SIZE);
+            auto hash = crypto::sha256(chunk);
+            if (hash != BN254_CRS_CHUNK_HASHES[i]) {
+                // Record this failure (only the first CAS wins).
+                size_t expected = chunks_to_verify;
+                failed_chunk.compare_exchange_strong(expected, i, std::memory_order_relaxed);
+            }
+        }
+    });
+
+    size_t bad = failed_chunk.load();
+    if (bad < chunks_to_verify) {
+        size_t offset = bad * CRS_HASH_CHUNK_SIZE;
+        throw_or_abort("CRS integrity check failed: SHA256 mismatch at chunk " + std::to_string(bad) +
+                       " (bytes " + std::to_string(offset) + "-" +
+                       std::to_string(offset + CRS_HASH_CHUNK_SIZE - 1) + ")");
+    }
+}
+
+} // namespace bb::srs
diff --git a/barretenberg/cpp/src/barretenberg/srs/factories/crs_factory.test.cpp b/barretenberg/cpp/src/barretenberg/srs/factories/crs_factory.test.cpp
index b79ead7c4c13..f1eb3d8d1c22 100644
--- a/barretenberg/cpp/src/barretenberg/srs/factories/crs_factory.test.cpp
+++ b/barretenberg/cpp/src/barretenberg/srs/factories/crs_factory.test.cpp
@@ -3,6 +3,7 @@
 #include "barretenberg/ecc/curves/bn254/bn254.hpp"
 #include "barretenberg/ecc/curves/bn254/pairing.hpp"
 #include "barretenberg/srs/factories/bn254_crs_data.hpp"
+#include "barretenberg/srs/factories/bn254_crs_hashes.hpp"
 #include "barretenberg/srs/factories/get_bn254_crs.hpp"
 #include "barretenberg/srs/factories/mem_bn254_crs_factory.hpp"
 #include "barretenberg/srs/factories/mem_grumpkin_crs_factory.hpp"
@@ -122,3 +123,21 @@ TEST(CrsFactory, Bn254Fallback)
 
     fs::remove_all(temp_crs_path);
 }
+
+TEST(CrsFactory, Bn254HashVerification)
+{
+    // Verify whatever CRS data we have on disk against the embedded chunk hashes.
+    auto g1_path = bb::srs::bb_crs_path() / "bn254_g1.dat";
+    size_t file_size = get_file_size(g1_path);
+
+    // Round down to a whole number of 8MB chunks (the verify function requires alignment).
+    size_t verifiable_size = (file_size / bb::srs::CRS_HASH_CHUNK_SIZE) * bb::srs::CRS_HASH_CHUNK_SIZE;
+    ASSERT_GT(verifiable_size, 0) << "Need at least one 8MB chunk of CRS data on disk";
+
+    auto data = read_file(g1_path, verifiable_size);
+    EXPECT_NO_THROW(bb::srs::verify_bn254_crs_integrity(data));
+
+    // Corrupt a byte and verify that hash check catches it
+    data[100] ^= 0xFF;
+    EXPECT_ANY_THROW(bb::srs::verify_bn254_crs_integrity(data));
+}
diff --git a/barretenberg/cpp/src/barretenberg/srs/factories/get_bn254_crs.cpp b/barretenberg/cpp/src/barretenberg/srs/factories/get_bn254_crs.cpp
index 8e08f48deace..f374120004be 100644
--- a/barretenberg/cpp/src/barretenberg/srs/factories/get_bn254_crs.cpp
+++ b/barretenberg/cpp/src/barretenberg/srs/factories/get_bn254_crs.cpp
@@ -1,10 +1,12 @@
 #include "get_bn254_crs.hpp"
 #include "barretenberg/api/file_io.hpp"
+#include <algorithm>
 #include "barretenberg/common/flock.hpp"
 #include "barretenberg/common/serialize.hpp"
 #include "barretenberg/ecc/curves/bn254/g1.hpp"
 #include "barretenberg/ecc/curves/bn254/g2.hpp"
 #include "bn254_crs_data.hpp"
+#include "bn254_crs_hashes.hpp"
 #include "http_download.hpp"
 
 namespace {
@@ -17,7 +19,19 @@ std::vector<uint8_t> download_bn254_g1_data(size_t num_points,
                                             const std::string& primary_url,
                                             const std::string& fallback_url)
 {
-    size_t g1_end = (num_points * sizeof(bb::g1::affine_element)) - 1;
+    // Round up download size to next 8MB chunk boundary so every downloaded chunk
+    // can be fully verified against embedded SHA256 hashes.
+    // Cap at 256 full chunks to avoid requesting past end-of-file (the full CRS has
+    // 256 full 8MB chunks + a 64-byte remainder that can't fill another chunk).
+    constexpr size_t points_per_chunk = bb::srs::CRS_HASH_CHUNK_SIZE / sizeof(bb::g1::affine_element);
+    constexpr size_t max_aligned_points = bb::srs::CRS_NUM_FULL_CHUNKS * points_per_chunk;
+    size_t aligned_points = ((num_points + points_per_chunk - 1) / points_per_chunk) * points_per_chunk;
+    if (aligned_points > max_aligned_points) {
+        aligned_points = max_aligned_points;
+    }
+    // Request enough bytes for whichever is larger: the chunk-aligned amount or the actual request.
+    size_t download_points = std::max(aligned_points, num_points);
+    size_t g1_end = (download_points * sizeof(bb::g1::affine_element)) - 1;
 
     // Try primary URL first, with fallback on failure.
     // Note: WASM is compiled with -fno-exceptions, so try/catch is not available.
@@ -40,19 +54,15 @@ std::vector<uint8_t> download_bn254_g1_data(size_t num_points,
         throw_or_abort("Downloaded g1 data is too small");
     }
 
-    // Verify first element matches our expected point.
+    // Verify first element matches the expected generator point (quick sanity check for all download sizes).
     auto first_element = from_buffer<bb::g1::affine_element>(data, 0);
     if (first_element != bb::srs::BN254_G1_FIRST_ELEMENT) {
         throw_or_abort("Downloaded BN254 G1 CRS first element does not match expected point.");
     }
 
-    // Verify second element if we have enough data
-    if (data.size() >= 2 * sizeof(bb::g1::affine_element)) {
-        auto second_element = from_buffer<bb::g1::affine_element>(data, sizeof(bb::g1::affine_element));
-        if (second_element != bb::srs::get_bn254_g1_second_element()) {
-            throw_or_abort("Downloaded BN254 G1 CRS second element does not match expected point.");
-        }
-    }
+    // Verify integrity of all complete 8MB chunks against embedded SHA256 hashes.
+    // This protects against man-in-the-middle attacks on HTTP downloads without requiring SSL/TLS.
+    bb::srs::verify_bn254_crs_integrity(data);
 
     return data;
 }
diff --git a/barretenberg/scripts/generate_crs_hashes.sh b/barretenberg/scripts/generate_crs_hashes.sh
new file mode 100755
index 000000000000..9bbcbd466742
--- /dev/null
+++ b/barretenberg/scripts/generate_crs_hashes.sh
@@ -0,0 +1,162 @@
+#!/usr/bin/env bash
+# Generate SHA256 chunk hashes for BN254 CRS G1 data.
+# Outputs a C++ header file (bn254_crs_hashes.hpp) with embedded hashes.
+#
+# Usage: ./generate_crs_hashes.sh [crs_file] [output_file]
+#   crs_file:    Path to bn254_g1.dat (default: downloads from CDN)
+#   output_file: Output header path (default: stdout)
+#
+# Requirements: python3, curl (if downloading)
+
+set -euo pipefail
+
+CRS_FILE="${1:-}"
+OUTPUT_FILE="${2:-}"
+CHUNK_SIZE=8388608  # 8MB
+
+# Download CRS if not provided
+if [ -z "$CRS_FILE" ]; then
+    CRS_FILE=$(mktemp /tmp/bn254_g1_XXXXXX.dat)
+    trap 'rm -f "$CRS_FILE"' EXIT
+
+    # Download 2^25 + 1 points = 33,554,433 * 64 bytes
+    NUM_BYTES=$((33554433 * 64))
+    END_BYTE=$((NUM_BYTES - 1))
+
+    PRIMARY_URL="http://crs.aztec-cdn.foundation/g1.dat"
+    FALLBACK_URL="http://crs.aztec-labs.com/g1.dat"
+
+    echo "Downloading BN254 CRS G1 data ($NUM_BYTES bytes)..." >&2
+    if ! curl -f --range "0-$END_BYTE" "$PRIMARY_URL" -o "$CRS_FILE" 2>/dev/null; then
+        echo "Primary download failed, trying fallback..." >&2
+        curl -f --range "0-$END_BYTE" "$FALLBACK_URL" -o "$CRS_FILE"
+    fi
+    echo "Download complete." >&2
+fi
+
+if [ ! -f "$CRS_FILE" ]; then
+    echo "Error: CRS file not found: $CRS_FILE" >&2
+    exit 1
+fi
+
+python3 -c "
+import hashlib, sys, os
+
+CHUNK_SIZE = $CHUNK_SIZE
+crs_file = '$CRS_FILE'
+hashes = []
+
+with open(crs_file, 'rb') as f:
+    while True:
+        chunk = f.read(CHUNK_SIZE)
+        if not chunk:
+            break
+        hashes.append(hashlib.sha256(chunk).digest())
+
+file_size = os.path.getsize(crs_file)
+full_chunks = file_size // CHUNK_SIZE
+partial_size = file_size % CHUNK_SIZE
+points_per_chunk = CHUNK_SIZE // 64
+
+out = sys.stdout
+out.write('#pragma once\n')
+out.write('#include \"barretenberg/common/thread.hpp\"\n')
+out.write('#include \"barretenberg/common/throw_or_abort.hpp\"\n')
+out.write('#include \"barretenberg/crypto/sha256/sha256.hpp\"\n')
+out.write('#include <array>\n')
+out.write('#include <atomic>\n')
+out.write('#include <cstddef>\n')
+out.write('#include <cstdint>\n')
+out.write('#include <span>\n')
+out.write('#include <string>\n')
+out.write('#include <vector>\n')
+out.write('\n')
+out.write('namespace bb::srs {\n')
+out.write('\n')
+out.write('/**\n')
+out.write(' * @brief SHA256 hashes for integrity verification of downloaded BN254 CRS G1 data.\n')
+out.write(' *\n')
+out.write(' * @details The CRS file is divided into 8MB (8,388,608 byte) chunks. Each entry contains\n')
+out.write(' * the SHA256 hash of the corresponding chunk. Downloads are rounded up to 8MB boundaries\n')
+out.write(' * so that every downloaded chunk can be fully verified.\n')
+out.write(' *\n')
+out.write(f' * Source file: bn254_g1.dat ({file_size} bytes, {file_size // 64} G1 points)\n')
+out.write(f' * Chunk size: {CHUNK_SIZE} bytes ({points_per_chunk} points per chunk)\n')
+out.write(f' * Total chunks: {len(hashes)} ({full_chunks} full + 1 partial of {partial_size} bytes)\n')
+out.write(' *\n')
+out.write(' * Regenerate with: barretenberg/scripts/generate_crs_hashes.sh\n')
+out.write(' */\n')
+out.write(f'constexpr size_t CRS_HASH_CHUNK_SIZE = {CHUNK_SIZE};\n')
+out.write(f'constexpr size_t CRS_NUM_CHUNK_HASHES = {len(hashes)};\n')
+out.write(f'// Number of full {CHUNK_SIZE // (1024*1024)}MB chunks in the CRS (the last chunk is only {partial_size} bytes).\n')
+out.write(f'constexpr size_t CRS_NUM_FULL_CHUNKS = {full_chunks};\n')
+out.write('\n')
+out.write('// clang-format off\n')
+out.write(f'inline const std::array<crypto::Sha256Hash, {len(hashes)}> BN254_CRS_CHUNK_HASHES = {{{{\n')
+for i, h in enumerate(hashes):
+    hex_bytes = ', '.join(f'0x{b:02x}' for b in h)
+    comma = ',' if i < len(hashes) - 1 else ''
+    out.write(f'    {{ {hex_bytes} }}{comma}\n')
+out.write('}};\n')
+out.write('// clang-format on\n')
+out.write('\n')
+out.write('/**\n')
+out.write(' * @brief Verify downloaded CRS data against embedded SHA256 chunk hashes.\n')
+out.write(' *\n')
+out.write(' * @details Verifies the integrity of downloaded CRS data by checking SHA256 hashes\n')
+out.write(' * of each 8MB chunk in parallel across available cores. The data must be aligned to\n')
+out.write(' * the 8MB chunk size. Any trailing bytes smaller than a chunk are skipped.\n')
+out.write(' * This provides integrity verification for CRS data downloaded over HTTP without\n')
+out.write(' * requiring SSL/TLS.\n')
+out.write(' *\n')
+out.write(' * @param data The downloaded CRS data bytes (must be a multiple of CRS_HASH_CHUNK_SIZE)\n')
+out.write(' * @throws If the data is not chunk-aligned or any chunk hash does not match\n')
+out.write(' */\n')
+out.write('inline void verify_bn254_crs_integrity(const std::vector<uint8_t>& data)\n')
+out.write('{\n')
+out.write('    // Verify all complete 8MB chunks. Any trailing bytes smaller than a chunk are\n')
+out.write('    // not covered by chunk hashes (the full CRS has a 64-byte remainder after 256\n')
+out.write('    // full chunks) and are skipped.\n')
+out.write('    size_t num_full_chunks = data.size() / CRS_HASH_CHUNK_SIZE;\n')
+out.write('    size_t chunks_to_verify = std::min(num_full_chunks, CRS_NUM_CHUNK_HASHES);\n')
+out.write('    if (chunks_to_verify == 0) {\n')
+out.write('        return;\n')
+out.write('    }\n')
+out.write('\n')
+out.write('    // Track the first failing chunk index across threads.\n')
+out.write('    std::atomic<size_t> failed_chunk{ chunks_to_verify }; // sentinel = no failure\n')
+out.write('\n')
+out.write('    parallel_for([&](const ThreadChunk& tc) {\n')
+out.write('        for (size_t i : tc.range(chunks_to_verify)) {\n')
+out.write('            // Early exit if another thread already found a mismatch.\n')
+out.write('            if (failed_chunk.load(std::memory_order_relaxed) < chunks_to_verify) {\n')
+out.write('                return;\n')
+out.write('            }\n')
+out.write('            size_t offset = i * CRS_HASH_CHUNK_SIZE;\n')
+out.write('            auto chunk = std::span<const uint8_t>(data.data() + offset, CRS_HASH_CHUNK_SIZE);\n')
+out.write('            auto hash = crypto::sha256(chunk);\n')
+out.write('            if (hash != BN254_CRS_CHUNK_HASHES[i]) {\n')
+out.write('                // Record this failure (only the first CAS wins).\n')
+out.write('                size_t expected = chunks_to_verify;\n')
+out.write('                failed_chunk.compare_exchange_strong(expected, i, std::memory_order_relaxed);\n')
+out.write('            }\n')
+out.write('        }\n')
+out.write('    });\n')
+out.write('\n')
+out.write('    size_t bad = failed_chunk.load();\n')
+out.write('    if (bad < chunks_to_verify) {\n')
+out.write('        size_t offset = bad * CRS_HASH_CHUNK_SIZE;\n')
+out.write('        throw_or_abort(\"CRS integrity check failed: SHA256 mismatch at chunk \" + std::to_string(bad) +\n')
+out.write('                       \" (bytes \" + std::to_string(offset) + \"-\" +\n')
+out.write('                       std::to_string(offset + CRS_HASH_CHUNK_SIZE - 1) + \")\");\n')
+out.write('    }\n')
+out.write('}\n')
+out.write('\n')
+out.write('} // namespace bb::srs\n')
+
+print(f'Generated {len(hashes)} chunk hashes for {file_size} bytes', file=sys.stderr)
+" ${OUTPUT_FILE:+> "$OUTPUT_FILE"}
+
+if [ -n "$OUTPUT_FILE" ]; then
+    echo "Written to: $OUTPUT_FILE" >&2
+fi