diff --git a/.github/workflows/pr_main.yaml b/.github/workflows/pr_main.yaml
index a4554fda2..be4c4a5c6 100644
--- a/.github/workflows/pr_main.yaml
+++ b/.github/workflows/pr_main.yaml
@@ -101,15 +101,33 @@ jobs:
         run: |
           cargo test --release -p executor test_ckzg -- --ignored
 
+      # The real-block fixture (~1 MB) is gitignored and generated on demand;
+      # test_ethrex_real_block_native below needs it present. This also
+      # downloads the ethrex-replay cache the converter's own tests read.
+      - name: Generate ethrex real-block fixture
+        run: make ethrex-real-block-fixture
+
+      # Detached workspace. Executes the block through `LambdaVmEcsmCrypto`, the
+      # guest's own `Crypto` impl, and pins the fixture's sha256. Note it does NOT
+      # screen KZG (its graph links c-kzg via ethrex-config — see that crate's
+      # Cargo.toml); the ethrex-tests step below is what covers 0x0a.
+      - name: Run ethrex real-block converter tests (detached workspace)
+        run: |
+          cd tooling/ethrex-real-block && cargo test --release
+
       # ethrex host-reference tests live in the detached `tooling/ethrex-tests`
       # workspace (ethrex pins rkyv's `unaligned` feature, which must not
       # feature-unify with the main workspace's aligned proof format), so run
       # them from that directory to use its isolated Cargo.lock. The guest ELF
       # and committed fixtures are already present from the steps above.
       # --include-ignored also runs the heavier synthetic-block test.
+      # `test_ethrex_real_block_vm` is skipped: it drives a real block through
+      # the VM and its runtime is not yet measured, so it stays opt-in rather
+      # than sitting in the PR gate. Run it manually on a build server.
       - name: Run ethrex host-reference tests (detached workspace)
         run: |
-          cd tooling/ethrex-tests && cargo test --release -- --include-ignored
+          cd tooling/ethrex-tests && \
+            cargo test --release -- --include-ignored --skip test_ethrex_real_block_vm
 
   test-cli:
     name: CLI tests
diff --git a/Makefile b/Makefile
index 4abed4a90..dac63575f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,12 @@
 .PHONY: deps deps-linux deps-macos compile-programs-asm compile-programs-rust compile-bench \
 compile-programs compile-recursion-elfs clean-asm clean-rust clean-bench clean-shared \
 clean-recursion-elfs clean test test-asm \
-test-rust test-ethrex test-executor test-syscalls test-flamegraph flamegraph-prover test-profile-recursion test-profile-recursion-single test-profile-recursion-multi \
+test-rust test-ethrex test-ethrex-offline test-executor test-syscalls test-flamegraph flamegraph-prover test-profile-recursion test-profile-recursion-single test-profile-recursion-multi \
 test-profile-recursion-block recursion-profile-block-input \
 test-fast test-prover test-prover-all test-prover-debug test-disk-spill test-math-cuda test-cuda-integration test-cuda-fallback \
 test-prover-cuda test-prover-comprehensive-cuda \
 bench-math-cuda bench-prover bench-prover-cuda build check clippy fmt lint regen-ethrex-fixtures \
-update-ethrex-fixture-checksums check-ethrex-fixture-checksums
+update-ethrex-fixture-checksums check-ethrex-fixture-checksums ethrex-real-block-fixture
 
 UNAME := $(shell uname)
 
@@ -271,10 +271,45 @@ test-asm: compile-programs-asm
 test-rust: compile-programs-rust
 	cargo test -p executor --test rust
 
+# Real-block fixture: a genuine Hoodi block (4.4M gas, 11 txs, ~124 KB of
+# contract bytecode, 1705 state-trie nodes), as opposed to the synthetic
+# N-plain-transfer blocks from tooling/ethrex-fixtures. ~1 MB, so it is
+# generated on demand and gitignored rather than committed.
+#
+# The source is ethrex-replay's cache JSON, not that tool's own rkyv output:
+# ethrex-replay tracks ethrex `main`, where `ProgramInput` has diverged from the
+# rev our guest pins, so only the JSON is safe to read across the two.
+ETHREX_REAL_BLOCK := 1265656
+# Pinned by immutable `rev`, as the guest pins ethrex itself: a branch ref would
+# let the benchmark's input change under a fixed fixture name, silently breaking
+# comparability across runs. Re-pin deliberately when adopting a new block.
+ETHREX_REPLAY_REV := 2693e0182a8734117151d8ea2891eda5afc60383
+ETHREX_REAL_BLOCK_CACHE := tooling/ethrex-real-block/caches/cache_hoodi_$(ETHREX_REAL_BLOCK).json
+ETHREX_REAL_BLOCK_FIXTURE := executor/tests/ethrex_hoodi_$(ETHREX_REAL_BLOCK).bin
+
+ethrex-real-block-fixture: $(ETHREX_REAL_BLOCK_FIXTURE)
+
+$(ETHREX_REAL_BLOCK_CACHE):
+	mkdir -p $(dir $@)
+	curl -fsSL --retry 3 --retry-delay 2 --retry-all-errors -o $@.tmp \
+		https://raw.githubusercontent.com/lambdaclass/ethrex-replay/$(ETHREX_REPLAY_REV)/caches/cache_hoodi_$(ETHREX_REAL_BLOCK).json
+	mv $@.tmp $@
+
+$(ETHREX_REAL_BLOCK_FIXTURE): $(ETHREX_REAL_BLOCK_CACHE) tooling/ethrex-real-block/src/main.rs tooling/ethrex-real-block/Cargo.toml tooling/ethrex-real-block/Cargo.lock
+	cd tooling/ethrex-real-block && \
+		cargo run --release -- ../../$(ETHREX_REAL_BLOCK_CACHE) ../../$@
+
 # ethrex host-reference tests live in the detached `tooling/ethrex-tests`
 # workspace (ethrex pins rkyv's `unaligned` feature; isolated Cargo.lock).
-test-ethrex: compile-programs-rust
-	cd tooling/ethrex-tests && cargo test --release -- --include-ignored
+test-ethrex: compile-programs-rust $(ETHREX_REAL_BLOCK_FIXTURE)
+	cd tooling/ethrex-tests && cargo test --release -- --include-ignored --skip test_ethrex_real_block_vm
+
+# Offline variant: no network. `--skip test_ethrex_real_block` is a substring
+# match, so it drops both real-block tests — the `_vm` one and the `_native` one,
+# which reads the downloaded fixture and would otherwise fail on a clean checkout.
+# The committed synthetic fixtures and `no_kzg_backend_linked` still run.
+test-ethrex-offline: compile-programs-rust
+	cd tooling/ethrex-tests && cargo test --release -- --include-ignored --skip test_ethrex_real_block
 
 test-flamegraph:
 	cargo test -p executor --test flamegraph
diff --git a/executor/.gitignore b/executor/.gitignore
index 17f7497d7..c03cd0a0a 100644
--- a/executor/.gitignore
+++ b/executor/.gitignore
@@ -1,6 +1,8 @@
 /target
 /program_artifacts/rust
-/tests/ethrex_hoodi.bin
+# Real-block fixtures (~1 MB): generated by `make ethrex-real-block-fixture`
+# from an ethrex-replay cache, never committed. See tooling/ethrex-real-block.
+/tests/ethrex_hoodi*.bin
 /tests/ethrex_bench_*.bin
 # _4 is committed (~17 KB): used by `make recursion-profile-block-input` and
 # scripts/bench_recursion_scaling.sh. Other sizes stay ignored — scaling.sh
diff --git a/executor/tests/README.md b/executor/tests/README.md
index 39fd13813..820963ea1 100644
--- a/executor/tests/README.md
+++ b/executor/tests/README.md
@@ -52,3 +52,13 @@ ethrex_10_transfers.bin
   sha256: 38901ee4d40b99cf0aa7f642a92f0fc8db76d974bf43033a1673839020c3c28e
   contents: stateless ethrex block with ten plain ETH transfer transactions
 ```
+
+## Real-block fixtures
+
+The blocks above are synthetic (N plain ETH transfers over a small genesis).
+For a representative workload — real contract execution, real trie depth, real
+bytecode — `make ethrex-real-block-fixture` generates
+`ethrex_hoodi_1265656.bin` from an ethrex-replay cache. It is ~1 MB, so it is
+gitignored and generated on demand rather than committed, and its checksum is
+pinned in `tooling/ethrex-real-block/README.md` rather than above (the
+checksum script only covers committed fixtures).
diff --git a/tooling/ethrex-real-block/.gitignore b/tooling/ethrex-real-block/.gitignore
new file mode 100644
index 000000000..6d50c2d01
--- /dev/null
+++ b/tooling/ethrex-real-block/.gitignore
@@ -0,0 +1,4 @@
+/target
+# Downloaded ethrex-replay cache JSONs (~1.5 MB each), fetched on demand by
+# `make ethrex-real-block-fixture`.
+/caches/
diff --git a/tooling/ethrex-real-block/Cargo.lock b/tooling/ethrex-real-block/Cargo.lock
new file mode 100644
index 000000000..647596e66
--- /dev/null
+++ b/tooling/ethrex-real-block/Cargo.lock
@@ -0,0 +1,3343 @@
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diff --git a/tooling/ethrex-real-block/Cargo.toml b/tooling/ethrex-real-block/Cargo.toml
new file mode 100644
index 000000000..2a37b4bcb
--- /dev/null
+++ b/tooling/ethrex-real-block/Cargo.toml
@@ -0,0 +1,42 @@
+[package]
+name = "ethrex-real-block"
+version = "0.1.0"
+edition = "2024"
+
+# Detached workspace: keeps the heavy ethrex host deps out of the main build.
+[workspace]
+
+[dependencies]
+# Pinned to the SAME ethrex rev as the guest (open LambdaVM-backend PR branch)
+# so the generated ProgramInput rkyv layout matches what the guest deserializes.
+ethrex-common = { git = "https://github.com/lambdaclass/ethrex.git", rev = "156cb8d6a3974f411d71622eecd1b249ee37ff1c", package = "ethrex-common", default-features = false }
+ethrex-config = { git = "https://github.com/lambdaclass/ethrex.git", rev = "156cb8d6a3974f411d71622eecd1b249ee37ff1c", package = "ethrex-config", default-features = false }
+# Matches the guest's own declaration (executor/programs/rust/ethrex/Cargo.toml).
+#
+# CAVEAT: this line alone does NOT reproduce the guest's precompile surface. The
+# `ethrex-config` dep above pulls `ethrex-p2p`, whose `default = ["c-kzg"]`
+# propagates to `ethrex-crypto/c-kzg` — and `default-features = false` cannot
+# switch it off, because ethrex's own workspace declares `ethrex-p2p` with its
+# defaults on. So this graph links a working c-kzg (and malachite modexp, and
+# `ark-ff/asm` BN254) that the guest does not have; verify with
+# `cargo tree -e features -i ethrex-crypto`. Closing that gap means dropping
+# `ethrex-config` and sourcing `ChainConfig` another way — see the README.
+ethrex-guest-program = { git = "https://github.com/lambdaclass/ethrex.git", rev = "156cb8d6a3974f411d71622eecd1b249ee37ff1c", package = "ethrex-guest-program", default-features = false, features = ["lambdavm"] }
+
+# Exact pin: the fixture writer and the guest/executor readers must agree on the
+# rkyv layout. Keep this in sync with executor/{Cargo.toml,programs/rust/ethrex/Cargo.toml}.
+rkyv = { version = "=0.8.16", features = ["std", "unaligned"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+[dev-dependencies]
+# The `Crypto` impl the guest injects. Off riscv64 its keccak and ECSM paths
+# both fall back to software, so this exercises the guest's *fallback* crypto
+# semantics — not the accelerators themselves.
+lambda-vm-ethrex-crypto = { path = "../../crypto/ethrex-crypto" }
+sha2 = "0.10"
+
+# `ethrex-guest-program`'s `lambdavm` feature pins `lambda-vm-syscalls` to an
+# older commit; override it with our working-tree copy, as the guest does.
+[patch."https://github.com/yetanotherco/lambda_vm.git"]
+lambda-vm-syscalls = { path = "../../syscalls" }
diff --git a/tooling/ethrex-real-block/README.md b/tooling/ethrex-real-block/README.md
new file mode 100644
index 000000000..c0e5fcf37
--- /dev/null
+++ b/tooling/ethrex-real-block/README.md
@@ -0,0 +1,175 @@
+# ethrex-real-block
+
+Converts a **real Ethereum block** into a serialized `ProgramInput` `.bin` for
+the lambda-vm ethrex guest, reading an [`ethrex-replay`][replay] cache JSON.
+
+This complements `tooling/ethrex-fixtures`, which builds *synthetic* blocks of N
+plain ETH transfers. Those are cheap and deterministic but not representative:
+they execute no contract code, touch a genesis state trie only a couple of
+levels deep, and carry no bytecode in the witness. This tool produces the
+opposite — a block that actually looks like Ethereum.
+
+| | `ethrex_bench_20.bin` (synthetic) | `ethrex_hoodi_1265656.bin` (real) |
+|---|---|---|
+| gas used | 420,000 | **4,402,947** |
+| transactions | 20 (all plain transfers) | 11 (7× EIP-1559, 4× EIP-4844 blob) |
+| contract calls | 0 | 5, at ~830–955k gas each |
+| contract bytecode in witness | 0 | 22 contracts, ~124 KB |
+| state-trie nodes | a handful | 1,705 |
+| storage keys | 0 | 422 |
+| serialized size | 17 KB | 1,021,207 B |
+
+Note it has *fewer* transactions than the synthetic fixture while being far more
+representative — transaction count is not the axis that matters.
+
+Block 1265656 is **verified to run on the guest's precompile surface** (see
+[Validation](#validation)); it needs no accelerator we don't have. Any
+replacement block must clear the same check — that is what makes it usable, not
+just realistic.
+
+## Prerequisites
+Rust (stable) and network access on first run (cargo fetches the pinned ethrex
+crates; `make` downloads the cache). **No RV64 target or sysroot needed** — this
+is a host tool.
+
+## How to run
+
+From the repo root, the committed default (Hoodi block 1265656):
+
+```bash
+make ethrex-real-block-fixture
+```
+
+That downloads the cache to `caches/` (gitignored) and writes
+`executor/tests/ethrex_hoodi_1265656.bin` (gitignored — ~1 MB, too large to
+commit; see `executor/.gitignore`).
+
+The cache URL is pinned to an ethrex-replay **commit**, not to `main`
+(`ETHREX_REPLAY_REV` in the Makefile), matching how the guest pins ethrex. A
+branch ref would let the benchmark's input change under a fixed fixture name,
+which would quietly destroy comparability between runs.
+
+Directly, against any cache file:
+
+```bash
+cd tooling/ethrex-real-block
+cargo run --release -- <cache.json> <output_path>
+```
+
+Output is deterministic for a given cache file:
+
+```text
+ethrex_hoodi_1265656.bin
+  block:  hoodi #1265656 — 11 transactions, 4,402,947 gas
+  sha256: 1f7d4c4cdf9bd52472d9ebafdb4038f57a88c3c92d65c96fd86d7e323db87142
+  source: ethrex-replay caches/cache_hoodi_1265656.json @ 2693e018
+```
+
+That checksum is enforced, not just documented: `conversion_is_reproducible`
+asserts it. The pinned commit keeps the *input* immutable; the digest keeps the
+*derivation* honest.
+
+## Getting a cache for a different block
+
+The cache format is `ethrex-replay`'s, so use that tool to produce one — it
+handles the RPC fetching, multiple client backends, and the `eth_getProof`
+fallback, none of which is worth reimplementing here:
+
+```bash
+# In a checkout of https://github.com/lambdaclass/ethrex-replay
+ethrex-replay cache <block-number> --rpc-url <url>
+```
+
+`debug_executionWitness` requires a **reth or ethrex** node; public providers
+(Alchemy, Infura) do not serve it. `ethrex-replay` also supports `eth_getProof`
+for geth/nethermind.
+
+Only **mainnet, Hoodi and Sepolia** caches are accepted. ethrex-replay writes
+`network: "LocalDevnet"` for any other chain, and that resolves to a test chain
+(chain_id 9, every fork active from timestamp 0) — so converting it would replay
+the block under invented rules while still passing every check here, since the
+witness is only ever validated against whichever config we chose. The converter
+refuses instead; `unmappable_network_is_rejected` pins that.
+
+Then point this tool at the resulting JSON. Adopting a different block as the
+default is an edit, not a flag: `ETHREX_REAL_BLOCK` and `ETHREX_REPLAY_REV` in the
+Makefile, the `hoodi` in the cache URL, `CACHE` and the assertions in
+`src/main.rs`, and `REAL_BLOCK_FIXTURE` in `tooling/ethrex-tests`.
+
+## Why the JSON and not ethrex-replay's own `.bin`
+
+`ethrex-replay` can already emit a rkyv `ProgramInput`, but it tracks ethrex
+`main`, where the type has diverged from the rev our guest pins
+(`156cb8d6…`): `main` has an extra `fee_configs` field, moved the type from
+`l1::` to `input::`, and uses rkyv 0.8.10 against our exact `=0.8.16`. Its
+binary would not deserialize in our guest.
+
+The cache JSON carries only `blocks` + `witness` + `network` as plain serde, so
+it survives that drift. This tool re-reads it with **our** pinned ethrex types
+and re-serializes with **our** rkyv, which is what keeps the output layout
+correct by construction. When the guest's ethrex `rev` is bumped, bump it here
+too (and in `tooling/ethrex-fixtures` and the guest) and regenerate.
+
+A previous real-block fixture (`ethrex_hoodi.bin`) was lost exactly to this kind
+of drift — it predated the `Crypto` trait and stopped deserializing. Reading the
+version-tolerant JSON instead of a pinned binary is the mitigation.
+
+## Validation
+
+Six checks, cheapest first. Five run on the host and need no RV64 toolchain; they
+execute in milliseconds, though a cold build compiles the ethrex host dependency
+tree, which is what costs ~60s in CI rather than the tests themselves.
+
+**`cargo test` here — `real_block_executes_under_guest_crypto`.** Executes the
+block through `LambdaVmEcsmCrypto`, the `Crypto` impl the guest injects, so it is
+exercised via the guest's own trait dispatch. Stateless re-execution ends in a
+post-state-root check, so any divergence from consensus fails here.
+
+**It does not screen KZG.** Declaring `ethrex-guest-program` with
+`default-features = false, features = ["lambdavm"]` is necessary but not
+sufficient: the `ethrex-config` dependency (used only for
+`Network::get_genesis()`) pulls `ethrex-p2p`, whose `default = ["c-kzg"]`
+propagates down to `ethrex-crypto/c-kzg` — and `default-features = false` cannot
+switch it off, because ethrex's own workspace declares `ethrex-p2p` with defaults
+on. Verify with `cargo tree -e features -i ethrex-crypto`. So point evaluation
+(0x0a) resolves to a working c-kzg here and to nothing in the guest.
+
+Scope of the gap: in `ethrex-crypto`, KZG is the **only** precompile whose
+*availability* is feature-gated. The other two gates swap between working
+implementations — `secp256k1` picks libsecp256k1 over k256, `std` picks malachite
+over num-bigint for modexp — so they change which code runs, not whether a block
+can execute. Dropping `ethrex-config` would therefore be a CI-time improvement
+(it also sheds `ethrex-p2p`, `ethrex-blockchain`, `ethrex-storage` and the c-kzg
+and secp256k1 C builds), not a correctness fix.
+
+**`cargo test` here — `unmappable_network_is_rejected`.** Refuses a cache whose
+`network` cannot be mapped to real chain rules rather than converting it under
+substituted ones — see [above](#getting-a-cache-for-a-different-block) for why
+that matters.
+
+**`cargo test` here — `conversion_is_reproducible`.** Pins the block's stats and
+the fixture's **sha256**. A length assert would not do: `ChainConfig` is
+fixed-size, so a substituted chain config yields a byte-length-identical fixture,
+and rkyv's `big_endian` feature would byte-swap in place — neither changes the
+byte count. This is what catches an ethrex rev bump that moves the rkyv layout
+instead of silently producing a fixture the guest can't read.
+
+**`tooling/ethrex-tests` — `no_kzg_backend_linked`.** Asserts that crate links no
+KZG backend. That was incidental to its dependency graph, and it is the property
+the next check relies on, so it is pinned here rather than assumed.
+
+**`tooling/ethrex-tests` — `test_ethrex_real_block_native`.** Checks the
+serialized `.bin` itself deserializes and executes. Since that crate links no KZG
+backend, this is also **what screens point evaluation (0x0a)**: a block reaching
+it diverges from consensus and fails here.
+
+**`tooling/ethrex-tests` — `test_ethrex_real_block_vm`** (`#[ignore]`, excluded
+from PR CI). The block through the guest ELF, comparing the VM's committed
+output against the native reference. Needs the RV64 toolchain and its runtime is
+unmeasured; run it on a build server, not a laptop:
+
+```bash
+cd tooling/ethrex-tests && cargo test --release test_ethrex_real_block_vm -- --ignored
+```
+
+[replay]: https://github.com/lambdaclass/ethrex-replay
diff --git a/tooling/ethrex-real-block/src/main.rs b/tooling/ethrex-real-block/src/main.rs
new file mode 100644
index 000000000..72ccee3f6
--- /dev/null
+++ b/tooling/ethrex-real-block/src/main.rs
@@ -0,0 +1,198 @@
+//! Convert a real Ethereum block into the rkyv-serialized `ProgramInput` the
+//! lambda-vm ethrex guest consumes, from an `ethrex-replay` cache JSON.
+//!
+//! Usage:
+//!   cargo run --release -- <cache.json> <output_path>
+
+use ethrex_common::types::Block;
+use ethrex_common::types::block_execution_witness::RpcExecutionWitness;
+use ethrex_config::networks::Network;
+use ethrex_guest_program::l1::ProgramInput;
+use serde::Deserialize;
+
+/// The subset of `ethrex-replay`'s on-disk cache that a `ProgramInput` needs.
+///
+/// Deliberately deserialized with *our* pinned ethrex types rather than by
+/// depending on `ethrex-replay`: it tracks ethrex `main`, where `ProgramInput`
+/// has diverged (extra `fee_configs` field, different module path, rkyv 0.8.10
+/// vs our `=0.8.16`), so its own `.bin` output would not deserialize in our
+/// guest. This JSON is the version-tolerant interface between the two.
+///
+/// Extra fields in the file (L2 blob data, custom `chain_config`) are ignored.
+#[derive(Deserialize)]
+struct Cache {
+    blocks: Vec<Block>,
+    witness: RpcExecutionWitness,
+    network: Network,
+}
+
+/// Summary of the converted block, for the CLI's one-line report.
+struct BlockSummary {
+    network: String,
+    first_block_number: u64,
+    blocks: usize,
+    transactions: usize,
+    gas_used: u64,
+}
+
+fn program_input_from_cache(
+    cache_path: &str,
+) -> Result<(ProgramInput, BlockSummary), Box<dyn std::error::Error>> {
+    let cache: Cache =
+        serde_json::from_reader(std::io::BufReader::new(std::fs::File::open(cache_path)?))?;
+
+    let Some(first_block) = cache.blocks.first() else {
+        return Err("cache contains no blocks".into());
+    };
+    let summary = BlockSummary {
+        network: cache.network.to_string(),
+        first_block_number: first_block.header.number,
+        blocks: cache.blocks.len(),
+        transactions: cache.blocks.iter().map(|b| b.body.transactions.len()).sum(),
+        gas_used: cache.blocks.iter().map(|b| b.header.gas_used).sum(),
+    };
+
+    // The chain rules come from `network`, and ethrex-replay maps every chain it
+    // doesn't recognise (anything but mainnet / Hoodi / Sepolia) onto
+    // `LocalDevnet` — which resolves to a test chain: chain_id 9, every fork
+    // active from timestamp 0. Converting under that would execute the block
+    // against invented rules while still satisfying every check downstream (the
+    // witness is replayed against whatever config we picked, and host and guest
+    // read the same one), so refuse rather than guess.
+    if !matches!(cache.network, Network::PublicNetwork(_)) {
+        return Err(format!(
+            "unsupported network `{}`: its chain rules would be guessed, not read \
+             (ethrex-replay writes LocalDevnet for any chain it does not recognise)",
+            cache.network
+        )
+        .into());
+    }
+
+    // `into_execution_witness` rebuilds the trie structures from the flat node
+    // list and needs the parent header, which the cache carries inside `witness`.
+    let chain_config = cache.network.get_genesis()?.config;
+    let witness = cache
+        .witness
+        .into_execution_witness(chain_config, summary.first_block_number)?;
+
+    Ok((ProgramInput::new(cache.blocks, witness), summary))
+}
+
+fn usage_and_exit(program: &str) -> ! {
+    eprintln!("usage: {program} <cache.json> <output_path>");
+    std::process::exit(2);
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut args = std::env::args();
+    let program = args.next().unwrap_or_else(|| "ethrex-real-block".into());
+    let (Some(cache_path), Some(out_path)) = (args.next(), args.next()) else {
+        usage_and_exit(&program);
+    };
+    if args.next().is_some() {
+        usage_and_exit(&program);
+    }
+
+    let (program_input, summary) = program_input_from_cache(&cache_path)?;
+    let bytes = rkyv::to_bytes::<rkyv::rancor::Error>(&program_input)?;
+    std::fs::write(&out_path, &bytes)?;
+
+    println!(
+        "wrote {out_path} ({} bytes): {} block(s) from {} starting at #{}, \
+         {} transaction(s), {} gas",
+        bytes.len(),
+        summary.blocks,
+        summary.network,
+        summary.first_block_number,
+        summary.transactions,
+        summary.gas_used,
+    );
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const CACHE: &str = "caches/cache_hoodi_1265656.json";
+
+    /// Executes the converted block with `LambdaVmEcsmCrypto`, the `Crypto` impl
+    /// the guest injects, so the block is exercised through the same trait
+    /// dispatch the guest uses. Stateless re-execution ends in a post-state-root
+    /// check, so any divergence from consensus fails here — on the host, with no
+    /// RV64 toolchain and no proving run.
+    ///
+    /// It does NOT screen KZG: this crate's graph links `c-kzg` (via
+    /// `ethrex-config` → `ethrex-p2p`, see Cargo.toml), so point evaluation
+    /// (0x0a) resolves to a working implementation here while the guest has none.
+    /// A block calling 0x0a would pass this test.
+    ///
+    /// `test_ethrex_real_block_native` in `tooling/ethrex-tests` is what covers
+    /// 0x0a, and `no_kzg_backend_linked` there keeps it covered. That split is
+    /// sufficient rather than a workaround: KZG is the only precompile in
+    /// `ethrex-crypto` whose *availability* is feature-gated — the other gates
+    /// swap between two working implementations.
+    #[test]
+    fn real_block_executes_under_guest_crypto() {
+        use ethrex_guest_program::l1::execution_program;
+        use lambda_vm_ethrex_crypto::LambdaVmEcsmCrypto;
+        use std::sync::Arc;
+
+        let (program_input, _) = program_input_from_cache(CACHE).unwrap();
+        execution_program(program_input, Arc::new(LambdaVmEcsmCrypto)).unwrap();
+    }
+
+    /// A cache whose `network` we can't map to real chain rules must be refused,
+    /// not converted under substituted ones. Only the `network` field is changed
+    /// here, and the result is byte-length-identical to the real fixture — which
+    /// is exactly why the other tests cannot catch this on their own.
+    #[test]
+    fn unmappable_network_is_rejected() {
+        let mut cache: serde_json::Value =
+            serde_json::from_str(&std::fs::read_to_string(CACHE).unwrap()).unwrap();
+        cache["network"] = serde_json::json!("LocalDevnet");
+
+        let path = std::env::temp_dir().join(format!(
+            "ethrex_real_block_localdevnet_{}.json",
+            std::process::id()
+        ));
+        std::fs::write(&path, serde_json::to_vec(&cache).unwrap()).unwrap();
+        let result = program_input_from_cache(path.to_str().unwrap());
+        std::fs::remove_file(&path).ok();
+        let Err(err) = result else {
+            panic!("LocalDevnet resolves to chain_id 9 with all forks at 0; must not convert");
+        };
+
+        assert!(
+            err.to_string().contains("unsupported network"),
+            "wrong rejection reason: {err}"
+        );
+    }
+
+    /// The serialized form is what the guest actually reads, so pin it: a
+    /// change here means the rkyv layout moved and every consumer of the
+    /// fixture (and its README checksum) needs regenerating.
+    #[test]
+    fn conversion_is_reproducible() {
+        use sha2::Digest;
+
+        let (program_input, summary) = program_input_from_cache(CACHE).unwrap();
+        let bytes = rkyv::to_bytes::<rkyv::rancor::Error>(&program_input).unwrap();
+
+        assert_eq!(summary.first_block_number, 1_265_656);
+        assert_eq!(summary.transactions, 11);
+        assert_eq!(summary.gas_used, 4_402_947);
+
+        // Digest, not length: a layout change can preserve the byte count exactly
+        // (`ChainConfig` is fixed-size, and rkyv's `big_endian` feature would only
+        // byte-swap in place), so `len()` cannot pin the archived form.
+        let digest: String = sha2::Sha256::digest(&bytes)
+            .iter()
+            .map(|b| format!("{b:02x}"))
+            .collect();
+        assert_eq!(
+            digest, "1f7d4c4cdf9bd52472d9ebafdb4038f57a88c3c92d65c96fd86d7e323db87142",
+            "fixture bytes changed — regenerate it and update the README checksum",
+        );
+    }
+}
diff --git a/tooling/ethrex-tests/tests/ethrex.rs b/tooling/ethrex-tests/tests/ethrex.rs
index c87ccceba..b59640a1f 100644
--- a/tooling/ethrex-tests/tests/ethrex.rs
+++ b/tooling/ethrex-tests/tests/ethrex.rs
@@ -40,8 +40,8 @@ const ELF_PATH: &str = "../../executor/program_artifacts/rust/ethrex.elf";
 const FIXTURES_DIR: &str = "../../executor/tests";
 
 /// Larger-block smoke test: a synthetic ethrex block with 10 ETH transfers.
-/// (Replaces the old `ethrex_hoodi.bin` real-block fixture, which was in the
-/// pre-Crypto-trait ethrex format and no longer deserializes.)
+/// (The old `ethrex_hoodi.bin` real-block fixture predated the `Crypto` trait
+/// and no longer deserializes; the current real-block fixture is separate.)
 #[ignore = "heavier synthetic block (10 txs); run in the dedicated --ignored CI step"]
 #[test]
 fn test_ethrex() {
@@ -86,3 +86,85 @@ fn test_ethrex_empty_block() {
     let output = execution_program(input, Arc::new(NativeCrypto)).unwrap();
     run_program_and_check_public_output(ELF_PATH, output.encode(), inputs);
 }
+
+const REAL_BLOCK_FIXTURE: &str = "ethrex_hoodi_1265656.bin";
+
+/// Host-only acceptance gate for the real-block fixture produced by
+/// `tooling/ethrex-real-block` (`make ethrex-real-block-fixture`): the block is
+/// re-executed statelessly against its own witness, so a successful run means
+/// the recovered tries, codes and headers reproduce the header's post-state
+/// root. Needs no guest ELF, which is what keeps it runnable where the RV64
+/// toolchain isn't available.
+///
+/// Checks the *serialized artifact* specifically — that the committed rkyv
+/// bytes deserialize and execute — which is why it reads the `.bin` rather
+/// than converting the cache itself.
+///
+/// It is also, in practice, the check that the block needs no KZG: this crate's
+/// dependency graph links no KZG backend, so a block calling point evaluation
+/// (0x0a) diverges from consensus here and fails. That property is incidental to
+/// the dep graph rather than declared, so `no_kzg_backend_linked` below pins it.
+/// (`tooling/ethrex-real-block`'s parity test does NOT cover 0x0a — it links
+/// `c-kzg` transitively via `ethrex-config`.)
+#[test]
+fn test_ethrex_real_block_native() {
+    use ethrex_guest_program::crypto::NativeCrypto;
+    use ethrex_guest_program::l1::{ProgramInput, execution_program};
+    use rkyv::rancor::Error;
+    use std::sync::Arc;
+    let inputs = std::fs::read(format!("{FIXTURES_DIR}/{REAL_BLOCK_FIXTURE}")).unwrap();
+    let input = rkyv::from_bytes::<ProgramInput, Error>(&inputs).unwrap();
+    execution_program(input, Arc::new(NativeCrypto)).unwrap();
+}
+
+/// Pins the property the test above leans on: this crate's dependency graph must
+/// link no KZG backend, so a block calling point evaluation (0x0a) diverges from
+/// consensus and fails rather than passing on a surface the guest doesn't have.
+/// If a future dependency pulls `c-kzg` or `kzg-rs` in, this goes red instead of
+/// the screen silently disappearing.
+/// Detection is by error *text*, deliberately: zero input fails under a linked
+/// backend too (invalid G1 encoding), and both paths surface as
+/// `CryptoError::Other`, so the variant can't tell them apart. The string comes
+/// from `ethrex-crypto`'s `KzgError::Unimplemented`; if upstream rewords it this
+/// test goes red, which is the safe direction.
+///
+/// Worth knowing why this can regress: `ethrex-crypto`'s own default feature set
+/// is `["std", "kzg-rs", "secp256k1"]`, so any future dependency pulling it in
+/// with defaults on restores a backend and silently removes the screen.
+#[test]
+fn no_kzg_backend_linked() {
+    use ethrex_guest_program::crypto::{Crypto, NativeCrypto};
+    let result = NativeCrypto.verify_kzg_proof(&[0u8; 32], &[0u8; 32], &[0u8; 48], &[0u8; 48]);
+    let message = match result {
+        Ok(()) => "verify_kzg_proof accepted zero input".to_string(),
+        Err(err) => format!("{err:?}"),
+    };
+    assert!(
+        message.contains("One of features c-kzg, openvm-kzg or kzg-rs should be active"),
+        "a KZG backend is linked into ethrex-tests, so test_ethrex_real_block_native no \
+         longer screens precompile 0x0a: {message}"
+    );
+}
+
+/// The same real block through the guest ELF, checking the VM's committed
+/// output matches the native reference. Split from the native gate above
+/// because this one needs the ethrex ELF and is far heavier than the synthetic
+/// fixtures (a ~1 MB witness, real contract execution).
+///
+/// Deliberately excluded from the PR CI step, which otherwise runs everything
+/// via `--include-ignored`: the cycle cost of a real block in the VM has not
+/// been measured yet, so it is opt-in until we know what it does to job time.
+/// Run it explicitly with:
+///   cd tooling/ethrex-tests && cargo test --release test_ethrex_real_block_vm -- --ignored
+#[ignore = "real block through the VM; unmeasured runtime, run explicitly on a build server"]
+#[test]
+fn test_ethrex_real_block_vm() {
+    use ethrex_guest_program::crypto::NativeCrypto;
+    use ethrex_guest_program::l1::{ProgramInput, execution_program};
+    use rkyv::rancor::Error;
+    use std::sync::Arc;
+    let inputs = std::fs::read(format!("{FIXTURES_DIR}/{REAL_BLOCK_FIXTURE}")).unwrap();
+    let input = rkyv::from_bytes::<ProgramInput, Error>(&inputs).unwrap();
+    let output = execution_program(input, Arc::new(NativeCrypto)).unwrap();
+    run_program_and_check_public_output(ELF_PATH, output.encode(), inputs);
+}