From 3c9d53a27bcf6265136b5ee993f8adeaab0cf7d0 Mon Sep 17 00:00:00 2001
From: Marcelo Politzer <251334+mpolitzer@users.noreply.github.com>
Date: Mon, 29 Jan 2024 11:03:06 -0300
Subject: [PATCH] feat!: add value to voucher

---
 sys-utils/libcmt/README.md               | 132 ++++
 sys-utils/libcmt/doc/examples/rollup.c   |   2 +-
 sys-utils/libcmt/include/libcmt/abi.h    |  45 ++
 sys-utils/libcmt/include/libcmt/rollup.h |  10 +-
 sys-utils/libcmt/src/abi.c               |  23 +
 sys-utils/libcmt/src/rollup.c            |  19 +-
 sys-utils/libcmt/src/tests/abi-single.c  | 844 +++--------------------
 sys-utils/libcmt/src/tests/rollup_echo.c |  23 +-
 8 files changed, 341 insertions(+), 757 deletions(-)

diff --git a/sys-utils/libcmt/README.md b/sys-utils/libcmt/README.md
index 2f80b968..0e9b891f 100644
--- a/sys-utils/libcmt/README.md
+++ b/sys-utils/libcmt/README.md
@@ -14,3 +14,135 @@ And finally, a couple of utility modules used by the high level API are also exp
 
 The header files and a compiled RISC-V version of this library can be found [here](https://github.com/cartesi/machine-emulator-tools/).
 We also provide `.pc` (pkg-config) files to facilitate linking.
+
+# mock and testing
+
+Both @ref libcmt\_rollup and libcmt\_io\_driver have a mock implementation. Run
+`make mock.build` to build the mock version of the library. The install
+destination can be specified with the `PREFIX` variable. An example:
+```
+make mock.install PREFIX=_install
+```
+will install the library and headers on `$PWD/_install` directory.
+
+## testing
+
+Use the environment variable @p CMT\_INPUTS to inject inputs to the mock.
+Outputs will be written on files.
+
+example:
+```
+CMT_INPUTS="0:advance.bin" ./application
+```
+
+with syntax:
+```
+CMT_INPUTS="<reason-number> ':' <filepath> ( ',' <reason-number> ':' <filepath> ) *"
+```
+
+In addition to @p CMT\_INPUTS, the is also the @p CMT\_DEBUG variable. Enable it
+for a verbose version of the low level calls.
+
+```
+CMT_DEBUG=yes ./application
+```
+
+## generating inputs
+
+Inputs and Outputs are expected to be EVM-ABI encoded. Encoding and decoding
+can be acheived multiple ways, including writing tools with this library. The
+Recommended way for testing is to use the @p cast tool from
+[foundry](http://book.getfoundry.sh/reference/cast/cast.html) and `xxd`.
+
+Encoding an @p EvmAdvance:
+```
+cast calldata "EvmAdvance(address,uint256,uint256,uint256,bytes)" \
+	0x0000000000000000000000000000000000000000 \
+	0x0000000000000000000000000000000000000000 \
+	0x0000000000000000000000000000000000000000 \
+	0x0000000000000000000000000000000000000000 \
+	0x`echo "advance-0" | xxd -p -c0` | xxd -r -p > 0.bin
+```
+
+Encoding an @p EvmInspect:
+```
+cast calldata "EvmInspect(bytes)" \
+	0x`echo "inspect-0" | xxd -p -c0` | xxd -r -p > 1.bin
+```
+
+## parsing outputs
+
+Decoding a voucher with the same tool:
+```
+cast calldata-decode "Voucher(address,uint256,bytes)" 0x`xxd -p -c0 "$1"` | (
+    read address
+    read value
+    read bytes
+
+    echo "{"
+    printf '\t"address" : "%s",\n' $address
+    printf '\t"value"   : "%s",\n' $value
+    printf '\t"bytes"   : "%s"\n' $bytes
+    echo "}"
+)
+
+# sh decode-voucher.sh $1 | jq '.bytes' | xxd -r
+```
+
+# binds
+
+Assuming the mock was installed at `_install`:
+
+Go example, compile with `go build main.go`:
+```
+package main
+
+/*
+#cgo CFLAGS: -I../_install/include/
+#cgo LDFLAGS: -L../_install/lib/ -lcmt
+
+#include "libcmt/rollup.h"
+*/
+import "C"
+
+import (
+    "math/big"
+    "fmt"
+    "unsafe"
+)
+
+func main() {
+    var rollup C.cmt_rollup_t
+    err := C.cmt_rollup_init(&rollup)
+    if err != 0 {
+        fmt.Printf("initialization failed\n")
+    }
+
+    bytes_s := []byte{
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+    }
+    wei := new(big.Int).SetBytes(bytes_s)
+
+    finish := C.cmt_rollup_finish_t{
+        accept_previous_request: true,
+    }
+    for {
+        var advance C.cmt_rollup_advance_t
+        err = C.cmt_rollup_finish(&rollup, &finish)
+        if err != 0 { return; }
+
+        err = C.cmt_rollup_read_advance_state(&rollup, &advance);
+        if err != 0 { return; }
+
+        bytes:= wei.Bytes()
+        size := len(bytes)
+        C.cmt_rollup_emit_voucher(&rollup, &advance.sender[0],
+                                  C.uint(size), unsafe.Pointer(&bytes[0]),
+                                  advance.length, advance.data)
+        C.cmt_rollup_emit_report(&rollup, advance.length, advance.data)
+    }
+}
+```
diff --git a/sys-utils/libcmt/doc/examples/rollup.c b/sys-utils/libcmt/doc/examples/rollup.c
index 68e7702d..d641546e 100644
--- a/sys-utils/libcmt/doc/examples/rollup.c
+++ b/sys-utils/libcmt/doc/examples/rollup.c
@@ -24,7 +24,7 @@ int main(void) {
                     break;
                 }
 
-                rc = cmt_rollup_emit_voucher(&rollup, advance.sender, advance.length, advance.data);
+                rc = cmt_rollup_emit_voucher(&rollup, advance.sender, 0, NULL, advance.length, advance.data);
                 if (rc < 0) {
                     fprintf(stderr, "%s:%d Error on voucher %s (%d)\n", __FILE__, __LINE__, strerror(-rc), (-rc));
                     break;
diff --git a/sys-utils/libcmt/include/libcmt/abi.h b/sys-utils/libcmt/include/libcmt/abi.h
index 8ab862a1..a704a7fb 100644
--- a/sys-utils/libcmt/include/libcmt/abi.h
+++ b/sys-utils/libcmt/include/libcmt/abi.h
@@ -169,6 +169,39 @@ int cmt_abi_put_funsel(cmt_buf_t *me, uint32_t funsel);
  * @note This function takes care of endianess conversions */
 int cmt_abi_put_uint(cmt_buf_t *me, size_t n, const void *data);
 
+/** Encode a big-endian value of up to 32bytes of data into the buffer
+ *
+ * @param [in,out] me     a initialized buffer working as iterator
+ * @param [in]     length size of @p data in bytes
+ * @param [in]     data   poiter to a integer
+ *
+ * @return
+ * - 0 success
+ * - ENOBUFS no space left in @p me
+ * - EDOM requested @p n is too large
+ *
+ * @code
+ * ...
+ * cmt_buf_t it = ...;
+ * uint8_t small[] = {
+ *     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ *     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ *     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ *     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+ * };
+ * cmt_abi_put_uint(&it, sizeof small, &small);
+ * ...
+ * uint8_t big[] = {
+ *     0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ *     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ *     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ *     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ * };
+ * cmt_abi_put_uint(&it, sizeof big, &big);
+ * @endcode
+ * @note This function takes care of endianess conversions */
+int cmt_abi_put_uint_be(cmt_buf_t *me, size_t n, const void *data);
+
 /** Encode a bool into the buffer
  *
  * @param [in,out] me    a initialized buffer working as iterator
@@ -282,6 +315,18 @@ int cmt_abi_check_funsel(cmt_buf_t *me, uint32_t expected);
  * - EDOM    value won't fit into @p n bytes. */
 int cmt_abi_get_uint(cmt_buf_t *me, size_t n, void *data);
 
+/** Decode @p length big-endian bytes, up to 32, from the buffer into @p data
+ *
+ * @param [in,out] me     initialized buffer
+ * @param [in]     length size of @p data in bytes
+ * @param [out]    data   pointer to a integer
+ *
+ * @return
+ * - 0 success
+ * - ENOBUFS no space left in @p me
+ * - EDOM    value won't fit into @p n bytes. */
+int cmt_abi_get_uint_be(cmt_buf_t *me, size_t n, void *data);
+
 /** Consume and decode @b address from the buffer
  *
  * @param [in,out] me      initialized buffer
diff --git a/sys-utils/libcmt/include/libcmt/rollup.h b/sys-utils/libcmt/include/libcmt/rollup.h
index 36852721..9bfaae73 100644
--- a/sys-utils/libcmt/include/libcmt/rollup.h
+++ b/sys-utils/libcmt/include/libcmt/rollup.h
@@ -18,7 +18,7 @@
  * Rollup abstraction layer
  *
  * Takes care of @ref libcmt_io_driver interactions, @ref libcmt_abi
- * encoding/decoding and @ref libcmt_merkle tree interactions.
+ * encoding/decoding and @ref libcmt_merkle tree handling.
  *
  * Mocked version has support for simulating I/O via environment variables:
  * @p CMT_INPUTS="0:input.bin,..." and verbose ouput with @p CMT_DEBUG=yes.
@@ -89,7 +89,7 @@ void cmt_rollup_fini(cmt_rollup_t *me);
  * @return
  * - 0 success
  * - -ENOBUFS no space left in @p me */
-int cmt_rollup_emit_voucher(cmt_rollup_t *me, uint8_t address[CMT_ADDRESS_LENGTH], size_t n, const void *data);
+int cmt_rollup_emit_voucher(cmt_rollup_t *me, uint8_t address[CMT_ADDRESS_LENGTH], uint32_t value_length, const void *value_data, uint32_t length, const void *data);
 
 /** Emit a notice
  *
@@ -99,7 +99,7 @@ int cmt_rollup_emit_voucher(cmt_rollup_t *me, uint8_t address[CMT_ADDRESS_LENGTH
  * @return
  * - 0 success
  * - -ENOBUFS no space left in @p me */
-int cmt_rollup_emit_notice(cmt_rollup_t *me, size_t n, const void *data);
+int cmt_rollup_emit_notice(cmt_rollup_t *me, uint32_t length, const void *data);
 
 /** Emit a report
  * @param [in,out] me      initialized cmt_rollup_t instance
@@ -108,7 +108,7 @@ int cmt_rollup_emit_notice(cmt_rollup_t *me, size_t n, const void *data);
  * @return
  * - 0 success
  * - -ENOBUFS no space left in @p me */
-int cmt_rollup_emit_report(cmt_rollup_t *me, size_t n, const void *data);
+int cmt_rollup_emit_report(cmt_rollup_t *me, uint32_t length, const void *data);
 
 /** Emit a exception
  * @param [in,out] me      initialized cmt_rollup_t instance
@@ -117,7 +117,7 @@ int cmt_rollup_emit_report(cmt_rollup_t *me, size_t n, const void *data);
  * @return
  * - 0 success
  * - -ENOBUFS no space left in @p me */
-int cmt_rollup_emit_exception(cmt_rollup_t *me, size_t n, const void *data);
+int cmt_rollup_emit_exception(cmt_rollup_t *me, uint32_t length, const void *data);
 
 /** Read advance state
  *
diff --git a/sys-utils/libcmt/src/abi.c b/sys-utils/libcmt/src/abi.c
index 1df60b0e..ba8ad11a 100644
--- a/sys-utils/libcmt/src/abi.c
+++ b/sys-utils/libcmt/src/abi.c
@@ -109,6 +109,17 @@ int cmt_abi_put_uint(cmt_buf_t *me, size_t n, const void *data) {
     return cmt_abi_encode_uint(n, data, x->begin);
 }
 
+int cmt_abi_put_uint_be(cmt_buf_t *me, size_t n, const void *data) {
+    cmt_buf_t x[1];
+
+    if (n > CMT_WORD_LENGTH)
+        return -EDOM;
+    if (cmt_buf_split(me, CMT_WORD_LENGTH, x, me))
+        return -ENOBUFS;
+
+    return cmt_abi_encode_uint_nn(n, data, x->begin);
+}
+
 int cmt_abi_put_bool(cmt_buf_t *me, bool value) {
     uint8_t boolean = !!value;
     return cmt_abi_put_uint(me, sizeof(boolean), &boolean);
@@ -188,6 +199,18 @@ int cmt_abi_get_uint(cmt_buf_t *me, size_t n, void *data) {
     return cmt_abi_decode_uint(x->begin, n, data);
 }
 
+int cmt_abi_get_uint_be(cmt_buf_t *me, size_t n, void *data) {
+    cmt_buf_t x[1];
+
+    if (n > CMT_WORD_LENGTH)
+        return -EDOM;
+    int rc = cmt_buf_split(me, CMT_WORD_LENGTH, x, me);
+    if (rc)
+        return rc;
+
+    return cmt_abi_decode_uint_nn(x->begin, n, data);
+}
+
 int cmt_abi_get_bool(cmt_buf_t *me, bool *value) {
     uint8_t boolean = 0;
     int rc = cmt_abi_put_uint(me, sizeof(boolean), &boolean);
diff --git a/sys-utils/libcmt/src/rollup.c b/sys-utils/libcmt/src/rollup.c
index df894ca9..0ac9c404 100644
--- a/sys-utils/libcmt/src/rollup.c
+++ b/sys-utils/libcmt/src/rollup.c
@@ -23,8 +23,8 @@
 #include <stdlib.h>
 #include <string.h>
 
-// Voucher(address,bytes)
-#define VOUCHER CMT_ABI_FUNSEL(0xef, 0x61, 0x5e, 0x2f)
+// Voucher(address,uint256,bytes)
+#define VOUCHER  CMT_ABI_FUNSEL(0x23, 0x7a, 0x81, 0x6f)
 
 // Notice(bytes)
 #define NOTICE CMT_ABI_FUNSEL(0xc2, 0x58, 0xd6, 0xe5)
@@ -71,7 +71,7 @@ void cmt_rollup_fini(cmt_rollup_t *me) {
     cmt_merkle_fini(me->merkle);
 }
 
-int cmt_rollup_emit_voucher(cmt_rollup_t *me, uint8_t address[20], size_t length, const void *data) {
+int cmt_rollup_emit_voucher(cmt_rollup_t *me, uint8_t address[CMT_ADDRESS_LENGTH], uint32_t value_length, const void *value_data, uint32_t length, const void *data) {
     if (!me)
         return -EINVAL;
     if (!data && length)
@@ -82,8 +82,11 @@ int cmt_rollup_emit_voucher(cmt_rollup_t *me, uint8_t address[20], size_t length
     cmt_buf_t of[1];
     void *params_base = tx->begin + 4; // after funsel
 
-    if (DBG(cmt_abi_put_funsel(wr, VOUCHER)) || DBG(cmt_abi_put_address(wr, address)) ||
-        DBG(cmt_abi_put_bytes_s(wr, of)) || DBG(cmt_abi_put_bytes_d(wr, of, length, data, params_base)))
+    if (DBG(cmt_abi_put_funsel(wr, VOUCHER))
+    ||  DBG(cmt_abi_put_address(wr, address))
+    ||  DBG(cmt_abi_put_uint_be(wr, value_length, value_data))
+    ||  DBG(cmt_abi_put_bytes_s(wr, of))
+    ||  DBG(cmt_abi_put_bytes_d(wr, of, length, data, params_base)))
         return -ENOBUFS;
 
     size_t m = wr->begin - tx->begin;
@@ -99,7 +102,7 @@ int cmt_rollup_emit_voucher(cmt_rollup_t *me, uint8_t address[20], size_t length
     return cmt_merkle_push_back_data(me->merkle, m, tx->begin);
 }
 
-int cmt_rollup_emit_notice(cmt_rollup_t *me, size_t length, const void *data) {
+int cmt_rollup_emit_notice(cmt_rollup_t *me, uint32_t length, const void *data) {
     if (!me)
         return -EINVAL;
     if (!data && length)
@@ -127,7 +130,7 @@ int cmt_rollup_emit_notice(cmt_rollup_t *me, size_t length, const void *data) {
     return cmt_merkle_push_back_data(me->merkle, m, tx->begin);
 }
 
-int cmt_rollup_emit_report(cmt_rollup_t *me, size_t length, const void *data) {
+int cmt_rollup_emit_report(cmt_rollup_t *me, uint32_t length, const void *data) {
     if (!me)
         return -EINVAL;
     if (!data && length)
@@ -148,7 +151,7 @@ int cmt_rollup_emit_report(cmt_rollup_t *me, size_t length, const void *data) {
     return DBG(cmt_io_yield(me->io, req));
 }
 
-int cmt_rollup_emit_exception(cmt_rollup_t *me, size_t length, const void *data) {
+int cmt_rollup_emit_exception(cmt_rollup_t *me, uint32_t length, const void *data) {
     if (!me)
         return -EINVAL;
     if (!data && length)
diff --git a/sys-utils/libcmt/src/tests/abi-single.c b/sys-utils/libcmt/src/tests/abi-single.c
index 1fc0901b..3406c403 100644
--- a/sys-utils/libcmt/src/tests/abi-single.c
+++ b/sys-utils/libcmt/src/tests/abi-single.c
@@ -40,38 +40,10 @@ static void encode_u8() {
     uint8_t x = 0x01;
     uint8_t en[CMT_WORD_LENGTH];
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
     };
     cmt_abi_encode_uint(sizeof(x), (void *) &x, en);
     assert(memcmp(en, be, sizeof(be)) == 0);
@@ -81,38 +53,10 @@ static void encode_u16() {
     uint16_t x = UINT16_C(0x0123);
     uint8_t en[CMT_WORD_LENGTH];
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x23,
     };
     cmt_abi_encode_uint(sizeof(x), (void *) &x, en);
     assert(memcmp(en, be, sizeof(be)) == 0);
@@ -122,38 +66,10 @@ static void encode_u32() {
     uint32_t x = UINT32_C(0x01234567);
     uint8_t en[CMT_WORD_LENGTH];
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x01, 0x23, 0x45, 0x67,
     };
     cmt_abi_encode_uint(sizeof(x), (void *) &x, en);
     assert(memcmp(en, be, sizeof(be)) == 0);
@@ -163,38 +79,10 @@ static void encode_u64() {
     uint64_t x = UINT64_C(0x0123456789abcdef);
     uint8_t en[CMT_WORD_LENGTH];
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
     };
     cmt_abi_encode_uint(sizeof(x), (void *) &x, en);
     assert(memcmp(en, be, sizeof(be)) == 0);
@@ -202,73 +90,17 @@ static void encode_u64() {
 
 static void encode_u256() {
     uint8_t x[CMT_WORD_LENGTH] = {
-        0x1f,
-        0x1e,
-        0x1d,
-        0x1c,
-        0x1b,
-        0x1a,
-        0x19,
-        0x18,
-        0x17,
-        0x16,
-        0x15,
-        0x14,
-        0x13,
-        0x12,
-        0x11,
-        0x10,
-        0x0f,
-        0x0e,
-        0x0d,
-        0x0c,
-        0x0b,
-        0x0a,
-        0x09,
-        0x08,
-        0x07,
-        0x06,
-        0x05,
-        0x04,
-        0x03,
-        0x02,
-        0x01,
-        0x00,
+        0x1f, 0x1e, 0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x18,
+        0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
+        0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
+        0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
     };
     uint8_t en[CMT_WORD_LENGTH];
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x01,
-        0x02,
-        0x03,
-        0x04,
-        0x05,
-        0x06,
-        0x07,
-        0x08,
-        0x09,
-        0x0a,
-        0x0b,
-        0x0c,
-        0x0d,
-        0x0e,
-        0x0f,
-        0x10,
-        0x11,
-        0x12,
-        0x13,
-        0x14,
-        0x15,
-        0x16,
-        0x17,
-        0x18,
-        0x19,
-        0x1a,
-        0x1b,
-        0x1c,
-        0x1d,
-        0x1e,
-        0x1f,
+        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
     };
     cmt_abi_encode_uint(sizeof(x), (void *) &x, en);
     assert(memcmp(en, be, sizeof(be)) == 0);
@@ -276,38 +108,10 @@ static void encode_u256() {
 
 static void encode_edom() {
     uint8_t x[CMT_WORD_LENGTH + 1] = {
-        0x00,
-        0x01,
-        0x02,
-        0x03,
-        0x04,
-        0x05,
-        0x06,
-        0x07,
-        0x08,
-        0x09,
-        0x0a,
-        0x0b,
-        0x0c,
-        0x0d,
-        0x0e,
-        0x0f,
-        0x10,
-        0x11,
-        0x12,
-        0x13,
-        0x14,
-        0x15,
-        0x16,
-        0x17,
-        0x18,
-        0x19,
-        0x1a,
-        0x1b,
-        0x1c,
-        0x1d,
-        0x1e,
-        0x1f,
+        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
         0x20,
     };
     uint8_t en[CMT_WORD_LENGTH];
@@ -318,38 +122,10 @@ static void encode_edom() {
 static void decode_u8() {
     uint8_t x, ex = 0x01;
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
     };
     assert(cmt_abi_decode_uint(be, sizeof(x), (void *) &x) == 0);
     assert(x == ex);
@@ -358,38 +134,10 @@ static void decode_u8() {
 static void decode_u16() {
     uint16_t x, ex = UINT16_C(0x0123);
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x23,
     };
     assert(cmt_abi_decode_uint(be, sizeof(x), (void *) &x) == 0);
     assert(x == ex);
@@ -398,38 +146,10 @@ static void decode_u16() {
 static void decode_u32() {
     uint32_t x, ex = UINT32_C(0x01234567);
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x01, 0x23, 0x45, 0x67,
     };
     assert(cmt_abi_decode_uint(be, sizeof(x), (void *) &x) == 0);
     assert(x == ex);
@@ -438,38 +158,10 @@ static void decode_u32() {
 static void decode_u64() {
     uint64_t x, ex = UINT64_C(0x0123456789abcdef);
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
     };
     assert(cmt_abi_decode_uint(be, sizeof(x), (void *) &x) == 0);
     assert(x == ex);
@@ -478,72 +170,16 @@ static void decode_u64() {
 static void decode_u256() {
     uint8_t x[CMT_WORD_LENGTH],
         ex[CMT_WORD_LENGTH] = {
-            0x1f,
-            0x1e,
-            0x1d,
-            0x1c,
-            0x1b,
-            0x1a,
-            0x19,
-            0x18,
-            0x17,
-            0x16,
-            0x15,
-            0x14,
-            0x13,
-            0x12,
-            0x11,
-            0x10,
-            0x0f,
-            0x0e,
-            0x0d,
-            0x0c,
-            0x0b,
-            0x0a,
-            0x09,
-            0x08,
-            0x07,
-            0x06,
-            0x05,
-            0x04,
-            0x03,
-            0x02,
-            0x01,
-            0x00,
+            0x1f, 0x1e, 0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x18,
+            0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
+            0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
         };
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x01,
-        0x02,
-        0x03,
-        0x04,
-        0x05,
-        0x06,
-        0x07,
-        0x08,
-        0x09,
-        0x0a,
-        0x0b,
-        0x0c,
-        0x0d,
-        0x0e,
-        0x0f,
-        0x10,
-        0x11,
-        0x12,
-        0x13,
-        0x14,
-        0x15,
-        0x16,
-        0x17,
-        0x18,
-        0x19,
-        0x1a,
-        0x1b,
-        0x1c,
-        0x1d,
-        0x1e,
-        0x1f,
+        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
     };
     assert(cmt_abi_decode_uint(be, sizeof(x), x) == 0);
     assert(memcmp(x, ex, sizeof(ex)) == 0);
@@ -553,38 +189,10 @@ static void decode_u256() {
 static void decode_edom() {
     uint64_t x;
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0xAA,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAA,
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
     };
     assert(cmt_abi_decode_uint(be, sizeof(x), (void *) &x) == -EDOM);
 }
@@ -602,38 +210,10 @@ static void put_funsel() {
 static void put_uint() {
     uint64_t x = UINT64_C(0x0123456789abcdef);
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
     };
     CMT_BUF_DECL(b, 64);
     cmt_buf_t it[1] = {*b};
@@ -643,41 +223,16 @@ static void put_uint() {
 }
 
 static void put_address() {
-    uint8_t x[20] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
-        0x01, 0x23, 0x45, 0x67};
+    uint8_t x[20] = {
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+        0x01, 0x23, 0x45, 0x67
+    };
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x01, 0x23, 0x45, 0x67,
+        0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67,
+        0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67,
     };
     CMT_BUF_DECL(b, 64);
     cmt_buf_t it[1] = {*b};
@@ -689,86 +244,16 @@ static void put_address() {
 static void put_bytes() {
     uint64_t x = UINT64_C(0x0123456789abcdef);
     uint8_t be[] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x20,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x08,
-        0xef,
-        0xcd,
-        0xab,
-        0x89,
-        0x67,
-        0x45,
-        0x23,
-        0x01,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
+        0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     };
     CMT_BUF_DECL(b, 128);
     cmt_buf_t it[1] = {*b}, of[1];
@@ -791,38 +276,10 @@ static void get_funsel() {
 static void get_uint() {
     uint64_t x, ex = UINT64_C(0x0123456789abcdef);
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
     };
     CMT_BUF_DECL3(b, sizeof(be), be);
     cmt_buf_t rd[1] = {*b};
@@ -832,42 +289,17 @@ static void get_uint() {
 }
 
 static void get_address() {
-    uint8_t x[20],
-        ex[20] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01,
-            0x23, 0x45, 0x67};
+    uint8_t x[20];
+    uint8_t ex[20] = {
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+        0x01, 0x23, 0x45, 0x67
+    };
     uint8_t be[CMT_WORD_LENGTH] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
-        0x89,
-        0xab,
-        0xcd,
-        0xef,
-        0x01,
-        0x23,
-        0x45,
-        0x67,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x01, 0x23, 0x45, 0x67,
+        0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67,
+        0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67,
     };
     CMT_BUF_DECL3(b, sizeof(be), be);
     cmt_buf_t it[1] = {*b};
@@ -879,86 +311,16 @@ static void get_address() {
 static void get_bytes() {
     uint64_t ex = UINT64_C(0x0123456789abcdef);
     uint8_t be[] = {
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x20,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x08,
-        0xef,
-        0xcd,
-        0xab,
-        0x89,
-        0x67,
-        0x45,
-        0x23,
-        0x01,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
-        0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
+        0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     };
     CMT_BUF_DECL3(b, sizeof(be), be);
     cmt_buf_t it[1] = {*b}, of[1], bytes[1];
diff --git a/sys-utils/libcmt/src/tests/rollup_echo.c b/sys-utils/libcmt/src/tests/rollup_echo.c
index 53ec0435..2fe5e7df 100644
--- a/sys-utils/libcmt/src/tests/rollup_echo.c
+++ b/sys-utils/libcmt/src/tests/rollup_echo.c
@@ -1,3 +1,15 @@
+/* Data encoding:
+ * - cast calldata "EvmAdvance(address,uint256,uint256,uint256,bytes)" \
+ *   0x0000000000000000000000000000000000000000 \
+ *   0x0000000000000000000000000000000000000001 \
+ *   0x0000000000000000000000000000000000000002 \
+ *   0x0000000000000000000000000000000000000003 \
+ *   0x`echo "hello world" | xxd -r -p -c0` > "<input.bin>"
+ *
+ * Data decoding:
+ * - cast calldata-decode "Voucher(address,uint256,bytes)" 0x`xxd -p -c0 "<output.bin>"`
+ *
+ */
 #include "libcmt/rollup.h"
 #include <errno.h>
 #include <stdio.h>
@@ -6,10 +18,17 @@
 
 int main(void) {
     cmt_rollup_t rollup;
-    if (!cmt_rollup_init(&rollup))
+
+    if (cmt_rollup_init(&rollup))
         return EXIT_FAILURE;
     // cmt_rollup_load_merkle(rollup, "/tmp/merkle.dat");
 
+    uint8_t small[] = {
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+    };
     for (;;) {
         int rc;
         cmt_rollup_finish_t finish = {.accept_previous_request = true};
@@ -27,7 +46,7 @@ int main(void) {
                     break;
                 }
 
-                rc = cmt_rollup_emit_voucher(&rollup, advance.sender, advance.length, advance.data);
+                rc = cmt_rollup_emit_voucher(&rollup, advance.sender, sizeof small, small, advance.length, advance.data);
                 if (rc < 0) {
                     fprintf(stderr, "%s:%d Error on voucher %s (%d)\n", __FILE__, __LINE__, strerror(-rc), (-rc));
                     break;