chore(json-tx): clang-format pass + regen hook/sfcodes.h

* clang-format-18 pass over the json-tx touchpoints so the
  clang-format CI workflow is green.
* regenerate hook/sfcodes.h (adds the sfJsonTxBody entry) so the
  verify-generated-headers CI workflow is green.

README.md

@@ -12,7 +12,7 @@ The server software that powers Xahau is called `xahaud` and is available in thi
 
 ### Build from Source
 
-* [Read the build instructions in our documentation](https://xahau.network/infrastructure/building-xahau)
+* [Read the build instructions in our documentation](https://xahau.network/docs/infrastructure/build-xahaud/)
 * If you encounter any issues, please [open an issue](https://github.com/xahau/xahaud/issues)
 
 ## Highlights of Xahau

hook/sfcodes.h

@@ -220,6 +220,7 @@
 #define sfProvider ((7U << 16U) + 30U)
 #define sfMPTokenMetadata ((7U << 16U) + 31U)
 #define sfCredentialType ((7U << 16U) + 32U)
+#define sfJsonTxBody ((7U << 16U) + 33U)
 #define sfRemarkValue ((7U << 16U) + 98U)
 #define sfRemarkName ((7U << 16U) + 99U)
 #define sfAccount ((8U << 16U) + 1U)

include/xrpl/protocol/Feature.h

@@ -80,7 +80,7 @@ namespace detail {
 // Feature.cpp. Because it's only used to reserve storage, and determine how
 // large to make the FeatureBitset, it MAY be larger. It MUST NOT be less than
 // the actual number of amendments. A LogicError on startup will verify this.
-static constexpr std::size_t numFeatures = 113;
+static constexpr std::size_t numFeatures = 114;
 
 /** Amendments that this server supports and the default voting behavior.
    Whether they are enabled depends on the Rules defined in the validated

include/xrpl/protocol/JsonTx.h

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2025 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_PROTOCOL_JSONTX_H_INCLUDED
+#define RIPPLE_PROTOCOL_JSONTX_H_INCLUDED
+
+#include <xrpl/basics/Blob.h>
+#include <xrpl/basics/Expected.h>
+#include <xrpl/basics/Slice.h>
+#include <xrpl/basics/base_uint.h>
+#include <xrpl/protocol/STTx.h>
+
+namespace ripple {
+namespace jsonTx {
+
+/** Returns true iff the STObject declares a sfJsonTxBody field.
+
+    Used as a routing predicate: a transaction with this field present
+    is claimed to use the "json-tx" signing scheme and must be validated
+    through jsonTx::checkSignature / checkStructuralEquivalence. An
+    empty body field still counts as "claimed json-tx" so the empty
+    case is reported as a clean failure instead of silently falling
+    back to the classical sig path.
+*/
+[[nodiscard]] bool
+hasBody(STObject const& obj) noexcept;
+
+/** Borrow a Slice over the ASCII body bytes.
+
+    Returns an empty slice if sfJsonTxBody is not present. The slice is
+    valid for as long as the STObject the field belongs to.
+*/
+[[nodiscard]] Slice
+body(STObject const& obj);
+
+/** SHA-512-Half of the body bytes.
+
+    This is the deterministic "ASCII signing digest" used by json-tx:
+    the bytes the client sees as their message are hashed with SHA-512
+    and truncated to 256 bits, the same digest convention rippled uses
+    elsewhere. Returns a zero-valued hash if sfJsonTxBody is absent.
+*/
+[[nodiscard]] uint256
+bodyHash(STObject const& obj);
+
+/** Signature check only: verify sfTxnSignature against the raw bytes of
+    sfJsonTxBody using sfSigningPubKey.
+
+    The classical signing payload is NOT used. This is the json-tx
+    analogue of STTx::checkSingleSign and is intended to be called from
+    the same code path (e.g. STTx::checkSign).
+
+    Precondition: `stx` carries a non-empty sfJsonTxBody.
+*/
+[[nodiscard]] Expected<void, std::string>
+checkSignature(STTx const& stx);
+
+/** Structural-equivalence check: parse sfJsonTxBody as JSON and confirm
+    it serialises to the same canonical binary as the other structural
+    fields of `stx` (excluding sfTxnSignature and sfJsonTxBody).
+
+    This is a local-check style rule -- it should run alongside
+    passesLocalChecks, not inside the signature verification path.
+
+    Precondition: `stx` carries a non-empty sfJsonTxBody.
+*/
+[[nodiscard]] Expected<void, std::string>
+checkStructuralEquivalence(STTx const& stx);
+
+}  // namespace jsonTx
+}  // namespace ripple
+
+#endif

include/xrpl/protocol/detail/features.macro

@@ -31,6 +31,7 @@
 // If you add an amendment here, then do not forget to increment `numFeatures`
 // in include/xrpl/protocol/Feature.h.
 
+XRPL_FEATURE(JsonTx,                     Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FEATURE(HookAPISerializedType240,   Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FEATURE(PermissionedDomains,        Supported::no,  VoteBehavior::DefaultNo)
 XRPL_FEATURE(DynamicNFT,                 Supported::no,  VoteBehavior::DefaultNo)

include/xrpl/protocol/detail/sfields.macro

@@ -292,6 +292,10 @@ TYPED_SFIELD(sfAssetClass,               VL,        29)
 TYPED_SFIELD(sfProvider,                 VL,        30)
 TYPED_SFIELD(sfMPTokenMetadata,          VL,        31)
 TYPED_SFIELD(sfCredentialType,           VL,        32)
+// json-tx: the exact ASCII bytes the client signed; authoritative over
+// the classical signing payload when present. Not part of the classical
+// signing-payload computation (the bytes ARE the signing payload).
+TYPED_SFIELD(sfJsonTxBody,               VL,        33, SField::sMD_Default, SField::notSigning)
 TYPED_SFIELD(sfRemarkValue,              VL,        98)
 TYPED_SFIELD(sfRemarkName,               VL,        99)
 

json-tx-py/pyproject.toml

@@ -0,0 +1,20 @@
+[project]
+name = "json-tx"
+version = "0.0.1"
+description = "Prototype: canonical packing of (tx_json_str, signature) using ripple-binary-codec output as an LZ dictionary"
+requires-python = ">=3.10"
+dependencies = [
+    "xrpl-py>=4.0.0",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/json_tx"]
+
+[tool.uv]
+dev-dependencies = [
+    "pytest>=8.0",
+]

json-tx-py/src/json_tx/__init__.py

@@ -0,0 +1,24 @@
+from json_tx import patch  # noqa: F401  -- side-effect: register JsonTxCompressed
+from json_tx.codec import (
+    JSON_TX_FIELD,
+    TAGS,
+    canonical_json,
+    compress_stream,
+    decompress_stream,
+    pack,
+    pack_wire,
+    unpack,
+    unpack_wire,
+)
+
+__all__ = [
+    "JSON_TX_FIELD",
+    "TAGS",
+    "canonical_json",
+    "compress_stream",
+    "decompress_stream",
+    "pack",
+    "pack_wire",
+    "unpack",
+    "unpack_wire",
+]

json-tx-py/src/json_tx/cli.py

@@ -0,0 +1,79 @@
+"""Demo: compare classical binary, raw JSON+sig, and JsonTxCompressed wire."""
+
+from __future__ import annotations
+
+import json
+
+from xrpl.core.binarycodec import encode, encode_for_signing
+from xrpl.core.keypairs import (
+    derive_classic_address,
+    derive_keypair,
+    generate_seed,
+    sign,
+)
+
+from json_tx import canonical_json, compress_stream, pack_wire, unpack_wire
+
+
+SAMPLE_TX = {
+    "TransactionType": "Payment",
+    "Account": "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh",
+    "Destination": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
+    "Amount": "1000000",
+    "Fee": "12",
+    "Sequence": 1,
+    "Flags": 2147483648,
+    "SigningPubKey": "",
+}
+
+
+def _report(label: str, tx: dict, tx_json_str: str, priv: str) -> None:
+    signature = bytes.fromhex(sign(tx_json_str.encode().hex(), priv))
+
+    # 1. Classical signed wire: full binary with TxnSignature (what xrpl does today).
+    classical_signing = bytes.fromhex(encode_for_signing(tx))
+    classical_signed_dict = dict(tx)
+    classical_signed_dict["TxnSignature"] = signature.hex().upper()
+    classical_wire = bytes.fromhex(encode(classical_signed_dict))
+
+    # 2. Naive JSON submission: tx_json_str + signature (what json-tx wants to replace).
+    raw_json_plus_sig = len(tx_json_str) + len(signature)
+
+    # 3. json-tx wire: classical binary (ex TxnSignature) + JsonTxCompressed + TxnSignature.
+    stream = compress_stream(tx_json_str, tx_json=tx)
+    jsontx_wire = pack_wire(tx_json_str, signature)
+
+    print(f"\n== {label} ==")
+    print(f"  tx_json_str                       : {len(tx_json_str):5d} bytes")
+    print(f"  signature                         : {len(signature):5d} bytes")
+    print(f"  classical binary (signing payload): {len(classical_signing):5d} bytes")
+    print(f"  classical wire (binary + sig)     : {len(classical_wire):5d} bytes   <- today")
+    print(f"  raw JSON + sig (bytes sent)       : {raw_json_plus_sig:5d} bytes   <- naive json submit")
+    print(f"  JsonTxCompressed stream alone     : {len(stream):5d} bytes   [mode=0x{stream[0]:02x}]")
+    print(f"  json-tx wire (classical + stream) : {len(jsontx_wire):5d} bytes   <- proposed")
+    delta_vs_classical = len(jsontx_wire) - len(classical_wire)
+    print(f"    overhead vs classical wire      : {delta_vs_classical:+5d} bytes")
+    delta_vs_raw = len(jsontx_wire) - raw_json_plus_sig
+    print(f"    overhead vs raw JSON+sig        : {delta_vs_raw:+5d} bytes")
+
+    recovered_tx, recovered_str, recovered_sig = unpack_wire(jsontx_wire)
+    assert recovered_str == tx_json_str
+    assert recovered_sig == signature
+    assert recovered_tx == tx
+
+
+def main() -> None:
+    seed = generate_seed()
+    pub, priv = derive_keypair(seed)
+    tx = dict(SAMPLE_TX)
+    tx["Account"] = derive_classic_address(pub)
+    tx["SigningPubKey"] = pub
+
+    _report("canonical tx_json_str (ordinal order, no whitespace)",
+            tx, canonical_json(tx), priv)
+    _report("non-canonical tx_json_str (insertion order + spaces)",
+            tx, json.dumps(tx, separators=(", ", ": ")), priv)
+
+
+if __name__ == "__main__":
+    main()

json-tx-py/src/json_tx/codec.py

@@ -0,0 +1,384 @@
+"""
+json-tx: field-aware packer for (tx_json_str, signature).
+
+The ripple binary codec already decomposes a transaction into ordered
+(field_name, canonical_bytes) pairs. We reuse that as the dictionary.
+
+Opcode stream:
+    OP_FIELD  i          -> render field i exactly as it appears in tx_json_str
+    OP_TAG    t          -> emit a glue snippet from TAGS (',', ':', '"', ...)
+    OP_RAW    n  <bytes> -> n bytes of literal passthrough
+    OP_END               -> terminator
+
+The stream is what gets stored in the `JsonTxCompressed` Blob field on
+the wire. The TxnSignature field still carries the ed25519/secp256k1
+signature, but that signature is now over the ASCII `tx_json_str`, not
+the classical signing payload.
+"""
+
+from __future__ import annotations
+
+import json
+from dataclasses import dataclass
+from typing import Any
+
+from xrpl.core.binarycodec.definitions.field_instance import FieldInstance
+from xrpl.core.binarycodec.types.st_object import STObject
+
+# `patch` registers the JsonTxCompressed field. Imported for its side effect.
+from json_tx import patch as _patch  # noqa: F401
+
+OP_FIELD = 0x01   # emit `"<name>":<canonical-value>` (tight pair)
+OP_TAG = 0x02     # emit a structural glue byte
+OP_RAW = 0x03     # length-prefixed literal bytes
+OP_NAME = 0x04    # emit `"<name>"` for field i
+OP_VALUE = 0x05   # emit canonical rendering of field i's value
+OP_END = 0x00
+
+# Mode byte at the head of every stream.
+MODE_CANONICAL = 0x00  # body is an OP_* stream; tx_json_str reconstructs via dictionary
+MODE_VERBATIM = 0x01   # body is raw UTF-8 tx_json_str, length-prefixed
+
+JSON_TX_FIELD = _patch.FIELD_NAME
+
+# Structural glue. INVARIANT: no tag may end in `"` -- otherwise it would
+# eat the leading `"` of a field NAME/FIELD rendering and prevent re-align.
+# Order: longest first so the greedy matcher picks the most specific glue.
+TAGS: list[bytes] = [
+    # comma-based field separators
+    b",\n    ",
+    b",\n\t",
+    b",\n  ",
+    b",\n ",
+    b",\n",
+    b", ",
+    # colon-based name:value separators
+    b":  ",
+    b": ",
+    # leading indent after `{`
+    b"\n    ",
+    b"\n\t",
+    b"\n  ",
+    b"\n ",
+    # single chars
+    b"{",
+    b"}",
+    b"[",
+    b"]",
+    b",",
+    b":",
+    b'"',
+    b" ",
+    b"\n",
+    b"\t",
+]
+
+
+# ---------- varint (unsigned LEB128) ----------
+
+def _vw(n: int) -> bytes:
+    if n < 0:
+        raise ValueError("varint must be non-negative")
+    out = bytearray()
+    while True:
+        b = n & 0x7F
+        n >>= 7
+        if n:
+            out.append(b | 0x80)
+        else:
+            out.append(b)
+            return bytes(out)
+
+
+def _vr(buf: bytes, i: int) -> tuple[int, int]:
+    n = 0
+    shift = 0
+    while True:
+        b = buf[i]
+        i += 1
+        n |= (b & 0x7F) << shift
+        if not (b & 0x80):
+            return n, i
+        shift += 7
+
+
+# ---------- canonical field extraction ----------
+
+@dataclass
+class CanonField:
+    name: str
+    instance: FieldInstance
+    canonical_bytes: bytes
+    value: Any
+
+
+def _ordered_fields_from_dict(tx_json: dict, *, skip: set[str]) -> list[CanonField]:
+    """Serialize tx_json once through STObject, then re-parse to slice each field."""
+    from xrpl.core.binarycodec.binary_wrappers.binary_parser import BinaryParser
+    from xrpl.core.binarycodec.definitions import definitions
+
+    tx_for_enc = {k: v for k, v in tx_json.items() if k not in skip}
+    st = STObject.from_value(tx_for_enc)
+    blob = bytes(st)
+
+    parser = BinaryParser(blob.hex())
+    total = len(parser)
+    fields: list[CanonField] = []
+    while not parser.is_end():
+        start = total - len(parser)
+        fi = parser.read_field()
+        parser.read_field_value(fi)
+        end = total - len(parser)
+        fields.append(
+            CanonField(
+                name=fi.name,
+                instance=definitions.get_field_instance(fi.name),
+                canonical_bytes=blob[start:end],
+                value=tx_json[fi.name],
+            )
+        )
+    return fields
+
+
+def _render_name(name: str) -> bytes:
+    """Render `"Name"` including the enclosing double-quotes."""
+    return json.dumps(name, separators=(",", ":")).encode()
+
+
+def _render_value(value: Any) -> bytes:
+    """Render the canonical JSON form of a value."""
+    return json.dumps(value, separators=(",", ":")).encode()
+
+
+def _render_field_json(name: str, value: Any) -> bytes:
+    """Render one tight `"Name":<value>` pair -- no whitespace."""
+    return _render_name(name) + b":" + _render_value(value)
+
+
+def canonical_json(tx_json: dict) -> str:
+    """Serialize tx_json with fields in canonical (ordinal) order.
+
+    The signed ASCII JSON must match this ordering so the opcode stream
+    can walk fields in lock-step with the binary dictionary. Any field the
+    codec does not recognize falls to the tail in insertion order.
+    """
+    from xrpl.core.binarycodec.definitions import definitions
+
+    known, unknown = [], []
+    for k, v in tx_json.items():
+        try:
+            fi = definitions.get_field_instance(k)
+            known.append((fi.ordinal, k, v))
+        except Exception:
+            unknown.append((k, v))
+    known.sort(key=lambda x: x[0])
+    ordered = [(k, v) for _o, k, v in known] + unknown
+    body = ",".join(
+        f"{json.dumps(k, separators=(',', ':'))}:"
+        f"{json.dumps(v, separators=(',', ':'))}"
+        for k, v in ordered
+    )
+    return "{" + body + "}"
+
+
+# ---------- stream codec (opcode layer only) ----------
+
+def compress_stream(tx_json_str: str, *, tx_json: dict | None = None) -> bytes:
+    """Encode tx_json_str using tx_json's fields as dictionary.
+
+    Opcodes (after the mode byte):
+      OP_FIELD i   -- `"Name":<canonical-value>` tight pair (no whitespace)
+      OP_NAME  i   -- `"Name"` alone (enclosing quotes included)
+      OP_VALUE i   -- canonical rendering of field i's value
+      OP_TAG   t   -- structural glue from TAGS
+      OP_RAW   n.. -- literal passthrough
+
+    The matcher at each cursor position tries, longest-match first:
+      1. OP_FIELD against any unused field pair
+      2. OP_NAME against any unused field name
+      3. OP_VALUE against any unused field value
+      4. OP_TAG
+      5. OP_RAW (one byte, coalesced)
+
+    If the resulting OP stream is not shorter than a verbatim copy, we
+    emit MODE_VERBATIM instead.
+    """
+    if tx_json is None:
+        tx_json = json.loads(tx_json_str)
+    src = tx_json_str.encode()
+
+    fields = _ordered_fields_from_dict(
+        tx_json, skip={"TxnSignature", JSON_TX_FIELD}
+    )
+    name_render = [_render_name(f.name) for f in fields]
+    value_render = [_render_value(f.value) for f in fields]
+    pair_render = [name_render[i] + b":" + value_render[i] for i in range(len(fields))]
+
+    unused_pair = set(range(len(fields)))
+    unused_name = set(range(len(fields)))
+    unused_value = set(range(len(fields)))
+
+    body = bytearray()
+    raw_buf = bytearray()
+
+    def flush_raw() -> None:
+        if raw_buf:
+            body.append(OP_RAW)
+            body.extend(_vw(len(raw_buf)))
+            body.extend(raw_buf)
+            raw_buf.clear()
+
+    def best_match(candidates: set[int], renders: list[bytes], at: int) -> tuple[int, int]:
+        best_idx, best_len = -1, 0
+        for idx in candidates:
+            r = renders[idx]
+            if len(r) > best_len and src.startswith(r, at):
+                best_idx, best_len = idx, len(r)
+        return best_idx, best_len
+
+    i = 0
+    while i < len(src):
+        # Try the tight FIELD match first -- cheapest per byte of output.
+        idx, hit = best_match(unused_pair, pair_render, i)
+        if idx >= 0:
+            flush_raw()
+            body.append(OP_FIELD)
+            body.extend(_vw(idx))
+            i += hit
+            unused_pair.discard(idx)
+            unused_name.discard(idx)
+            unused_value.discard(idx)
+            continue
+
+        # Then NAME (standalone), preferring longer names over shorter ones.
+        idx, hit = best_match(unused_name, name_render, i)
+        if idx >= 0:
+            flush_raw()
+            body.append(OP_NAME)
+            body.extend(_vw(idx))
+            i += hit
+            unused_name.discard(idx)
+            unused_pair.discard(idx)  # no longer a "pair" candidate
+            continue
+
+        # Then VALUE (standalone).
+        idx, hit = best_match(unused_value, value_render, i)
+        if idx >= 0:
+            flush_raw()
+            body.append(OP_VALUE)
+            body.extend(_vw(idx))
+            i += hit
+            unused_value.discard(idx)
+            unused_pair.discard(idx)
+            continue
+
+        # Structural glue.
+        tag_hit = -1
+        for t_idx, tag in enumerate(TAGS):
+            if src.startswith(tag, i):
+                tag_hit = t_idx
+                break
+        if tag_hit >= 0:
+            flush_raw()
+            body.append(OP_TAG)
+            body.extend(_vw(tag_hit))
+            i += len(TAGS[tag_hit])
+            continue
+
+        raw_buf.append(src[i])
+        i += 1
+
+    flush_raw()
+    body.append(OP_END)
+
+    op_form = bytes([MODE_CANONICAL]) + bytes(body)
+    verbatim = bytes([MODE_VERBATIM]) + _vw(len(src)) + src
+    return op_form if len(op_form) <= len(verbatim) else verbatim
+
+
+def decompress_stream(stream: bytes, tx_json_for_dict: dict) -> str:
+    """Rebuild tx_json_str from a json-tx stream + a parsed tx dict (dictionary source)."""
+    mode = stream[0]
+    i = 1
+    if mode == MODE_VERBATIM:
+        ln, i = _vr(stream, i)
+        return stream[i : i + ln].decode()
+    if mode != MODE_CANONICAL:
+        raise ValueError(f"unknown json-tx stream mode 0x{mode:02x}")
+
+    fields = _ordered_fields_from_dict(
+        tx_json_for_dict,
+        skip={"TxnSignature", JSON_TX_FIELD},
+    )
+    name_render = [_render_name(f.name) for f in fields]
+    value_render = [_render_value(f.value) for f in fields]
+    pair_render = [name_render[i] + b":" + value_render[i] for i in range(len(fields))]
+
+    out = bytearray()
+    while i < len(stream):
+        op = stream[i]
+        i += 1
+        if op == OP_END:
+            break
+        if op == OP_FIELD:
+            idx, i = _vr(stream, i)
+            out += pair_render[idx]
+        elif op == OP_NAME:
+            idx, i = _vr(stream, i)
+            out += name_render[idx]
+        elif op == OP_VALUE:
+            idx, i = _vr(stream, i)
+            out += value_render[idx]
+        elif op == OP_TAG:
+            idx, i = _vr(stream, i)
+            out += TAGS[idx]
+        elif op == OP_RAW:
+            ln, i = _vr(stream, i)
+            out += stream[i : i + ln]
+            i += ln
+        else:
+            raise ValueError(f"unknown opcode 0x{op:02x} at offset {i - 1}")
+    return out.decode()
+
+
+# ---------- wire-tx pack/unpack (full binary with JsonTxCompressed) ----------
+
+def pack_wire(tx_json_str: str, signature: bytes) -> bytes:
+    """Build the on-wire binary tx: canonical binary + JsonTxCompressed + TxnSignature.
+
+    `tx_json_str` is the exact ASCII bytes the client signed -- any field
+    order / whitespace. `signature` is the raw signature over those bytes.
+    """
+    from xrpl.core.binarycodec.main import encode
+
+    tx_json = json.loads(tx_json_str)
+    stream = compress_stream(tx_json_str, tx_json=tx_json)
+    wire_dict = dict(tx_json)
+    wire_dict[JSON_TX_FIELD] = stream.hex().upper()
+    wire_dict["TxnSignature"] = signature.hex().upper()
+    return bytes.fromhex(encode(wire_dict))
+
+
+def unpack_wire(wire: bytes) -> tuple[dict, str, bytes]:
+    """Decode the wire tx back into (tx_json_dict, tx_json_str, signature)."""
+    from xrpl.core.binarycodec.main import decode
+
+    decoded = decode(wire.hex().upper())
+    stream_hex = decoded.pop(JSON_TX_FIELD)
+    sig_hex = decoded.pop("TxnSignature")
+    # The dictionary is the other fields of the tx, i.e. the decoded dict
+    # minus the scaffolding keys (already removed above).
+    tx_json_str = decompress_stream(bytes.fromhex(stream_hex), decoded)
+    return json.loads(tx_json_str), tx_json_str, bytes.fromhex(sig_hex)
+
+
+# ---------- convenience ----------
+
+def pack(tx_json: dict, signature: bytes) -> bytes:
+    """Alias for pack_wire for the common case."""
+    return pack_wire(tx_json, signature)
+
+
+def unpack(wire: bytes) -> tuple[dict, bytes]:
+    tx_json, _, sig = unpack_wire(wire)
+    return tx_json, sig

json-tx-py/src/json_tx/patch.py

@@ -0,0 +1,50 @@
+"""Runtime monkey-patch: register a `JsonTxCompressed` Blob field.
+
+Import this module (or call `register_json_tx_field()`) before using the
+binary codec so that a transaction dict containing `JsonTxCompressed`
+will serialize it as a Blob and parse it back out.
+
+The field is intentionally `isSigningField=False` — the ASCII JSON is
+what TxnSignature signs, not the binary form, so this field must not
+participate in any classical signing payload.
+"""
+
+from __future__ import annotations
+
+from xrpl.core.binarycodec.definitions import definitions as _d
+from xrpl.core.binarycodec.definitions.field_header import FieldHeader
+from xrpl.core.binarycodec.definitions.field_info import FieldInfo
+
+FIELD_NAME = "JsonTxCompressed"
+_TYPE_NAME = "Blob"
+
+
+def _pick_free_nth_for_type(type_name: str) -> int:
+    """Find an unused `nth` code within the given type so there's no header clash."""
+    type_code = _d._TYPE_ORDINAL_MAP[type_name]
+    taken = {
+        h.field_code for h in _d._FIELD_HEADER_NAME_MAP if h.type_code == type_code
+    }
+    for n in range(1, 255):
+        if n not in taken:
+            return n
+    raise RuntimeError(f"no free nth code for type {type_name}")
+
+
+def register_json_tx_field() -> None:
+    if FIELD_NAME in _d._FIELD_INFO_MAP:
+        return
+    nth = _pick_free_nth_for_type(_TYPE_NAME)
+    info = FieldInfo(
+        nth=nth,
+        is_variable_length_encoded=True,
+        is_serialized=True,
+        is_signing_field=False,
+        type_name=_TYPE_NAME,
+    )
+    header = FieldHeader(_d._TYPE_ORDINAL_MAP[_TYPE_NAME], nth)
+    _d._FIELD_INFO_MAP[FIELD_NAME] = info
+    _d._FIELD_HEADER_NAME_MAP[header] = FIELD_NAME
+
+
+register_json_tx_field()

json-tx-py/tests/test_roundtrip.py

@@ -0,0 +1,63 @@
+import json
+
+from xrpl.core.keypairs import derive_classic_address, derive_keypair, generate_seed, sign
+
+from json_tx import compress_stream, decompress_stream, pack_wire, unpack_wire
+
+
+def _signed(tx: dict) -> tuple[dict, str, bytes]:
+    seed = generate_seed()
+    pub, priv = derive_keypair(seed)
+    tx = dict(tx)
+    tx["Account"] = derive_classic_address(pub)
+    tx["SigningPubKey"] = pub
+    from json_tx import canonical_json
+    tx_json_str = canonical_json(tx)
+    sig = bytes.fromhex(sign(tx_json_str.encode().hex(), priv))
+    return tx, tx_json_str, sig
+
+
+def test_wire_roundtrip():
+    tx, tx_json_str, sig = _signed({
+        "TransactionType": "Payment",
+        "Destination": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
+        "Amount": "1000000",
+        "Fee": "12",
+        "Sequence": 1,
+        "Flags": 2147483648,
+    })
+    wire = pack_wire(tx_json_str, sig)
+    recovered_tx, recovered_str, recovered_sig = unpack_wire(wire)
+    assert recovered_str == tx_json_str
+    assert recovered_sig == sig
+    assert recovered_tx == tx
+
+
+def test_stream_roundtrip_direct():
+    tx, tx_json_str, _ = _signed({
+        "TransactionType": "Payment",
+        "Destination": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
+        "Amount": "2500000",
+        "Fee": "15",
+        "Sequence": 42,
+        "Flags": 0,
+    })
+    stream = compress_stream(tx_json_str, tx_json=tx)
+    rebuilt = decompress_stream(stream, tx)
+    assert rebuilt == tx_json_str
+
+
+def test_raw_fallback_preserved():
+    # Unusual whitespace -> RAW opcodes. Dictionary still reconstructs losslessly.
+    tx = {
+        "TransactionType": "Payment",
+        "Account": "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh",
+        "Destination": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
+        "Amount": "1",
+        "Fee": "12",
+        "Sequence": 1,
+        "SigningPubKey": "",
+    }
+    odd = '{  "TransactionType" : "Payment"  }'
+    stream = compress_stream(odd, tx_json=tx)
+    assert decompress_stream(stream, tx) == odd

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src/libxrpl/protocol/JsonTx.cpp

@@ -0,0 +1,187 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2025 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+*/
+//==============================================================================
+
+#include <xrpl/protocol/JsonTx.h>
+
+#include <xrpl/basics/StringUtilities.h>
+#include <xrpl/basics/strHex.h>
+#include <xrpl/json/json_reader.h>
+#include <xrpl/protocol/PublicKey.h>
+#include <xrpl/protocol/SField.h>
+#include <xrpl/protocol/STBase.h>
+#include <xrpl/protocol/STBlob.h>
+#include <xrpl/protocol/STObject.h>
+#include <xrpl/protocol/STParsedJSON.h>
+#include <xrpl/protocol/Serializer.h>
+#include <xrpl/protocol/digest.h>
+#include <xrpl/protocol/jss.h>
+
+#include <algorithm>
+#include <initializer_list>
+#include <string>
+#include <vector>
+
+namespace ripple {
+namespace jsonTx {
+
+namespace {
+
+/** Canonical serialization of `obj` with the given fields removed.
+    STObject's own serialization already sorts by field code, but we
+    have to walk the fields ourselves to skip the json-tx wrapper
+    entries rather than mutate the object. */
+Blob
+canonicalSerialization(
+    STObject const& obj,
+    std::initializer_list<SField const*> skip)
+{
+    std::vector<STBase const*> fields;
+    for (auto const& entry : obj)
+    {
+        if (entry.getSType() == STI_NOTPRESENT)
+            continue;
+        bool skipped = false;
+        for (SField const* s : skip)
+            if (entry.getFName() == *s)
+            {
+                skipped = true;
+                break;
+            }
+        if (!skipped)
+            fields.push_back(&entry);
+    }
+    std::sort(
+        fields.begin(), fields.end(), [](STBase const* a, STBase const* b) {
+            return a->getFName().fieldCode < b->getFName().fieldCode;
+        });
+
+    Serializer s;
+    for (STBase const* f : fields)
+    {
+        f->addFieldID(s);
+        f->add(s);
+        auto const sType = f->getSType();
+        if (sType == STI_ARRAY || sType == STI_OBJECT)
+            s.addFieldID(sType, 1);
+    }
+    return s.getData();
+}
+
+}  // namespace
+
+bool
+hasBody(STObject const& obj) noexcept
+{
+    try
+    {
+        return obj.isFieldPresent(sfJsonTxBody);
+    }
+    catch (...)
+    {
+        return false;
+    }
+}
+
+Slice
+body(STObject const& obj)
+{
+    if (!obj.isFieldPresent(sfJsonTxBody))
+        return Slice{};
+    // peekAtField gives us a view into the STObject's owned storage;
+    // STBlob::value() returns a Slice over that storage directly.
+    auto const& field = obj.peekAtField(sfJsonTxBody);
+    return static_cast<STBlob const&>(field).value();
+}
+
+uint256
+bodyHash(STObject const& obj)
+{
+    auto const s = body(obj);
+    if (s.empty())
+        return uint256{};
+    return sha512Half(s);
+}
+
+Expected<void, std::string>
+checkSignature(STTx const& stx)
+{
+    if (!hasBody(stx))
+        return Unexpected<std::string>("JsonTxBody field is missing.");
+
+    auto const bodySlice = body(stx);
+    if (bodySlice.empty())
+        return Unexpected<std::string>("JsonTxBody is empty.");
+
+    if (!stx.isFieldPresent(sfSigningPubKey))
+        return Unexpected<std::string>("SigningPubKey is missing.");
+
+    Blob const spk = stx.getFieldVL(sfSigningPubKey);
+    if (!publicKeyType(makeSlice(spk)))
+        return Unexpected<std::string>("SigningPubKey is not a valid key.");
+
+    if (!stx.isFieldPresent(sfTxnSignature))
+        return Unexpected<std::string>("TxnSignature is missing.");
+
+    Blob const sig = stx.getFieldVL(sfTxnSignature);
+    if (sig.empty())
+        return Unexpected<std::string>("TxnSignature is empty.");
+
+    if (!verify(PublicKey(makeSlice(spk)), bodySlice, makeSlice(sig)))
+        return Unexpected<std::string>(
+            "Signature over JsonTxBody failed verification.");
+
+    return {};
+}
+
+Expected<void, std::string>
+checkStructuralEquivalence(STTx const& stx)
+{
+    if (!hasBody(stx))
+        return Unexpected<std::string>("JsonTxBody field is missing.");
+
+    auto const bodySlice = body(stx);
+    if (bodySlice.empty())
+        return Unexpected<std::string>("JsonTxBody is empty.");
+
+    std::string const bodyStr(
+        reinterpret_cast<char const*>(bodySlice.data()), bodySlice.size());
+
+    Json::Value parsed;
+    Json::Reader reader;
+    if (!reader.parse(bodyStr, parsed) || !parsed.isObject())
+        return Unexpected<std::string>(
+            "JsonTxBody is not a valid JSON object.");
+
+    STParsedJSONObject parsedObj("JsonTxBody", parsed);
+    if (!parsedObj.object)
+        return Unexpected<std::string>(
+            "JsonTxBody does not parse into a valid STObject: " +
+            (parsedObj.error.isMember(jss::error_message)
+                 ? parsedObj.error[jss::error_message].asString()
+                 : std::string("unknown parse error")));
+
+    // The json-tx wrapper fields (TxnSignature, JsonTxBody) are excluded
+    // from both sides: TxnSignature covers the body bytes (not the
+    // binary), and JsonTxBody is the body itself.
+    std::initializer_list<SField const*> const skip{
+        &sfTxnSignature, &sfJsonTxBody};
+
+    if (canonicalSerialization(stx, skip) !=
+        canonicalSerialization(*parsedObj.object, skip))
+        return Unexpected<std::string>(
+            "JsonTxBody content does not match the structural fields "
+            "of the transaction.");
+
+    return {};
+}
+
+}  // namespace jsonTx
+}  // namespace ripple

src/libxrpl/protocol/STTx.cpp

@@ -25,6 +25,7 @@
 #include <xrpl/json/to_string.h>
 #include <xrpl/protocol/Feature.h>
 #include <xrpl/protocol/HashPrefix.h>
+#include <xrpl/protocol/JsonTx.h>
 #include <xrpl/protocol/Protocol.h>
 #include <xrpl/protocol/PublicKey.h>
 #include <xrpl/protocol/STAccount.h>
@@ -216,6 +217,14 @@ STTx::checkSign(
 {
     try
     {
+        // json-tx: when sfJsonTxBody is present and the amendment is
+        // active, the signature covers the raw ASCII bytes of the body
+        // instead of the classical signing payload. Structural
+        // equivalence between the body and the other STTx fields is
+        // enforced separately in passesLocalChecks.
+        if (rules.enabled(featureJsonTx) && jsonTx::hasBody(*this))
+            return jsonTx::checkSignature(*this);
+
         // Determine whether we're single- or multi-signing by looking
         // at the SigningPubKey.  If it's empty we must be
         // multi-signing.  Otherwise we're single-signing.
@@ -663,6 +672,21 @@ passesLocalChecks(STObject const& st, std::string& reason)
         return false;
     }
 
+    // json-tx: if the tx carries sfJsonTxBody, its parsed content must
+    // match the other structural fields. We can only run this when the
+    // object is actually an STTx -- passesLocalChecks is also called on
+    // nested STObjects that don't participate in the json-tx scheme.
+    if (auto const* stx = dynamic_cast<STTx const*>(&st);
+        stx && jsonTx::hasBody(*stx))
+    {
+        if (auto const result = jsonTx::checkStructuralEquivalence(*stx);
+            !result)
+        {
+            reason = result.error();
+            return false;
+        }
+    }
+
     return true;
 }
 

src/libxrpl/protocol/TxFormats.cpp

@@ -43,7 +43,8 @@ TxFormats::TxFormats()
         {sfSigningPubKey, soeREQUIRED},
         {sfTicketSequence, soeOPTIONAL},
         {sfTxnSignature, soeOPTIONAL},
-        {sfSigners, soeOPTIONAL},  // submit_multisigned
+        {sfJsonTxBody, soeOPTIONAL},  // json-tx: ASCII bytes that were signed
+        {sfSigners, soeOPTIONAL},     // submit_multisigned
         {sfEmitDetails, soeOPTIONAL},
         {sfFirstLedgerSequence, soeOPTIONAL},
         {sfNetworkID, soeOPTIONAL},

src/test/app/JsonTx_test.cpp

@@ -0,0 +1,436 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2025 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+*/
+//==============================================================================
+
+#include <test/jtx.h>
+#include <xrpl/basics/Slice.h>
+#include <xrpl/basics/strHex.h>
+#include <xrpl/json/json_reader.h>
+#include <xrpl/protocol/Feature.h>
+#include <xrpl/protocol/JsonTx.h>
+#include <xrpl/protocol/PublicKey.h>
+#include <xrpl/protocol/STParsedJSON.h>
+#include <xrpl/protocol/SecretKey.h>
+#include <xrpl/protocol/Sign.h>
+#include <xrpl/protocol/digest.h>
+#include <xrpl/protocol/jss.h>
+
+namespace ripple {
+namespace test {
+
+struct JsonTx_test : public beast::unit_test::suite
+{
+    // Build a canonical Payment tx_json_str for `from` -> `to` with the given
+    // drops amount and sequence. Field order follows XRPL ordinal order so
+    // the json-tx codec can compress it maximally; tests here don't care
+    // about compression but the node accepts any valid JSON shape.
+    static std::string
+    buildPaymentJson(
+        jtx::Account const& from,
+        jtx::Account const& to,
+        std::uint64_t amountDrops,
+        std::uint32_t sequence,
+        std::uint64_t fee)
+    {
+        std::string const pkHex = strHex(from.pk().slice());
+        std::ostringstream os;
+        os << "{"
+           << R"("TransactionType":"Payment",)"
+           << R"("Flags":2147483648,)"
+           << R"("Sequence":)" << sequence << ","
+           << R"("Amount":")" << amountDrops << R"(",)"
+           << R"("Fee":")" << fee << R"(",)"
+           << R"("SigningPubKey":")" << pkHex << R"(",)"
+           << R"("Account":")" << from.human() << R"(",)"
+           << R"("Destination":")" << to.human() << R"(")"
+           << "}";
+        return os.str();
+    }
+
+    // Sign the UTF-8 bytes of tx_json_str with `from`'s secret key.
+    static Buffer
+    signBody(jtx::Account const& from, std::string const& tx_json_str)
+    {
+        return sign(
+            from.pk(),
+            from.sk(),
+            Slice{tx_json_str.data(), tx_json_str.size()});
+    }
+
+    static Json::Value
+    rpcSubmit(
+        jtx::Env& env,
+        std::string const& tx_json_str,
+        Buffer const& signature)
+    {
+        Json::Value params(Json::objectValue);
+        params["tx_json_str"] = tx_json_str;
+        params[jss::signature] = strHex(signature);
+        return env.rpc("json", "submit_json_tx", to_string(params));
+    }
+
+    // ---------- RPC-level tests ----------
+
+    void
+    testEnabledGate(FeatureBitset features)
+    {
+        testcase("enabled (feature gate)");
+        using namespace jtx;
+
+        for (bool const withFeature : {true, false})
+        {
+            auto const amend =
+                withFeature ? features : features - featureJsonTx;
+            Env env{*this, amend};
+
+            Account const alice{"alice"};
+            Account const bob{"bob"};
+            env.fund(XRP(1000), alice, bob);
+            env.close();
+
+            auto const fee = env.current()->fees().base.drops();
+            auto const txJson =
+                buildPaymentJson(alice, bob, 1'000'000, env.seq(alice), fee);
+            auto const sig = signBody(alice, txJson);
+            auto const result = rpcSubmit(env, txJson, sig);
+            env.close();
+
+            auto const& inner = result[jss::result];
+            if (withFeature)
+            {
+                BEAST_EXPECT(inner[jss::engine_result] == "tesSUCCESS");
+                BEAST_EXPECT(inner[jss::applied].asBool());
+            }
+            else
+            {
+                // Amendment is off -> the RPC itself rejects the
+                // submission before any classical verification.
+                BEAST_EXPECT(inner[jss::error].asString() == "notEnabled");
+            }
+        }
+    }
+
+    void
+    testBasicRoundtrip(FeatureBitset features)
+    {
+        testcase("basic payment roundtrip");
+        using namespace jtx;
+
+        Env env{*this, features};
+        Account const alice{"alice"};
+        Account const bob{"bob"};
+        env.fund(XRP(1000), alice, bob);
+        env.close();
+
+        auto const preAlice = env.balance(alice);
+        auto const preBob = env.balance(bob);
+        auto const feeDrops = env.current()->fees().base;
+
+        auto const txJson = buildPaymentJson(
+            alice, bob, 1'000'000, env.seq(alice), feeDrops.drops());
+        auto const sig = signBody(alice, txJson);
+
+        auto const result = rpcSubmit(env, txJson, sig);
+        env.close();
+
+        auto const& inner = result[jss::result];
+        BEAST_EXPECT(inner[jss::engine_result] == "tesSUCCESS");
+        BEAST_EXPECT(inner[jss::applied].asBool());
+        BEAST_EXPECT(inner["tx_json_str"].asString() == txJson);
+
+        BEAST_EXPECT(env.balance(alice) == preAlice - XRP(1) - feeDrops);
+        BEAST_EXPECT(env.balance(bob) == preBob + XRP(1));
+    }
+
+    void
+    testMissingParams(FeatureBitset features)
+    {
+        testcase("missing params");
+        using namespace jtx;
+
+        Env env{*this, features};
+        Account const alice{"alice"};
+        env.fund(XRP(1000), alice);
+        env.close();
+
+        auto const txJson = buildPaymentJson(
+            alice,
+            Account{"bob"},
+            1'000'000,
+            env.seq(alice),
+            env.current()->fees().base.drops());
+        auto const sig = signBody(alice, txJson);
+
+        // No tx_json_str.
+        {
+            Json::Value p(Json::objectValue);
+            p[jss::signature] = strHex(sig);
+            auto const r = env.rpc("json", "submit_json_tx", to_string(p));
+            BEAST_EXPECT(r[jss::result][jss::error] == "invalidParams");
+        }
+
+        // No signature.
+        {
+            Json::Value p(Json::objectValue);
+            p["tx_json_str"] = txJson;
+            auto const r = env.rpc("json", "submit_json_tx", to_string(p));
+            BEAST_EXPECT(r[jss::result][jss::error] == "invalidParams");
+        }
+
+        // Signature is not valid hex.
+        {
+            Json::Value p(Json::objectValue);
+            p["tx_json_str"] = txJson;
+            p[jss::signature] = "notahex";
+            auto const r = env.rpc("json", "submit_json_tx", to_string(p));
+            BEAST_EXPECT(r[jss::result][jss::error] == "invalidParams");
+        }
+    }
+
+    void
+    testInvalidJson(FeatureBitset features)
+    {
+        testcase("invalid tx_json_str");
+        using namespace jtx;
+
+        Env env{*this, features};
+        Account const alice{"alice"};
+        env.fund(XRP(1000), alice);
+        env.close();
+
+        // Syntactically invalid JSON.
+        {
+            std::string const bad = "{not valid json";
+            auto const sig = signBody(alice, bad);
+            auto const r = rpcSubmit(env, bad, sig);
+            BEAST_EXPECT(
+                r[jss::result][jss::error].asString() == "invalidTransaction");
+        }
+
+        // Valid JSON but not an object.
+        {
+            std::string const arr = R"([1,2,3])";
+            auto const sig = signBody(alice, arr);
+            auto const r = rpcSubmit(env, arr, sig);
+            BEAST_EXPECT(
+                r[jss::result][jss::error].asString() == "invalidTransaction");
+        }
+    }
+
+    void
+    testBadSignature(FeatureBitset features)
+    {
+        testcase("bad signature");
+        using namespace jtx;
+
+        Env env{*this, features};
+        Account const alice{"alice"};
+        Account const bob{"bob"};
+        env.fund(XRP(1000), alice, bob);
+        env.close();
+
+        auto const txJson = buildPaymentJson(
+            alice,
+            bob,
+            1'000'000,
+            env.seq(alice),
+            env.current()->fees().base.drops());
+        auto sig = signBody(alice, txJson);
+
+        // Flip a bit in the signature.
+        std::vector<std::uint8_t> corrupted(
+            sig.data(), sig.data() + sig.size());
+        corrupted.at(0) ^= 0x01;
+        Buffer bad(corrupted.data(), corrupted.size());
+
+        auto const result = rpcSubmit(env, txJson, bad);
+        BEAST_EXPECT(
+            result[jss::result][jss::error].asString() == "invalidTransaction");
+    }
+
+    void
+    testSignatureOverDifferentBytesFails(FeatureBitset features)
+    {
+        testcase("signature over different bytes");
+        using namespace jtx;
+
+        Env env{*this, features};
+        Account const alice{"alice"};
+        Account const bob{"bob"};
+        env.fund(XRP(1000), alice, bob);
+        env.close();
+
+        auto const txJson = buildPaymentJson(
+            alice,
+            bob,
+            1'000'000,
+            env.seq(alice),
+            env.current()->fees().base.drops());
+        // Sign a different string -- same tx, different bytes.
+        auto const otherJson = txJson + " ";
+        auto const sig = signBody(alice, otherJson);
+
+        auto const result = rpcSubmit(env, txJson, sig);
+        BEAST_EXPECT(
+            result[jss::result][jss::error].asString() == "invalidTransaction");
+    }
+
+    void
+    testWrongSigningPubKey(FeatureBitset features)
+    {
+        testcase("wrong SigningPubKey");
+        using namespace jtx;
+
+        Env env{*this, features};
+        Account const alice{"alice"};
+        Account const bob{"bob"};
+        Account const mallory{"mallory"};
+        env.fund(XRP(1000), alice, bob, mallory);
+        env.close();
+
+        // Alice's account, but signed with mallory's key: claim alice's
+        // SigningPubKey -> sig fails to verify. Then also try with
+        // mallory's SigningPubKey: sig verifies but Account mismatch
+        // causes downstream failure (tecNO_AUTH or similar).
+        auto txJson = buildPaymentJson(
+            alice,
+            bob,
+            1'000'000,
+            env.seq(alice),
+            env.current()->fees().base.drops());
+        auto const badSig = signBody(mallory, txJson);
+
+        auto const r = rpcSubmit(env, txJson, badSig);
+        BEAST_EXPECT(
+            r[jss::result][jss::error].asString() == "invalidTransaction");
+    }
+
+    // ---------- helper-level unit tests (no RPC) ----------
+
+    void
+    testHelperDirectly(FeatureBitset features)
+    {
+        testcase("helper functions direct");
+        using namespace jtx;
+
+        Env env{*this, features};
+        Account const alice{"alice"};
+        Account const bob{"bob"};
+        env.fund(XRP(1000), alice, bob);
+        env.close();
+
+        std::string const txJson = buildPaymentJson(
+            alice,
+            bob,
+            1'000'000,
+            env.seq(alice),
+            env.current()->fees().base.drops());
+        auto const sig = signBody(alice, txJson);
+
+        // Assemble an STTx mirroring what the node would produce from
+        // submit_json_tx.
+        Json::Value parsed;
+        Json::Reader reader;
+        BEAST_EXPECT(reader.parse(txJson, parsed) && parsed.isObject());
+
+        parsed[jss::TxnSignature] = strHex(sig);
+        parsed[sfJsonTxBody.jsonName] = strHex(txJson);
+
+        STParsedJSONObject parsedObj("tx", parsed);
+        BEAST_EXPECT(static_cast<bool>(parsedObj.object));
+        STTx const stx(std::move(*parsedObj.object));
+
+        // hasBody / body / bodyHash
+        BEAST_EXPECT(jsonTx::hasBody(stx));
+        auto const slice = jsonTx::body(stx);
+        BEAST_EXPECT(slice.size() == txJson.size());
+        BEAST_EXPECT(
+            std::memcmp(slice.data(), txJson.data(), txJson.size()) == 0);
+        auto const h = jsonTx::bodyHash(stx);
+        BEAST_EXPECT(h == sha512Half(Slice{txJson.data(), txJson.size()}));
+
+        // Signature check passes on a well-formed tx.
+        BEAST_EXPECT(static_cast<bool>(jsonTx::checkSignature(stx)));
+
+        // Structural equivalence passes.
+        BEAST_EXPECT(
+            static_cast<bool>(jsonTx::checkStructuralEquivalence(stx)));
+
+        // Tamper with the body -- change Amount in the ASCII without
+        // touching the structural fields. Signature will still be over
+        // the original bytes, so we re-sign over the new body so we
+        // isolate the structural-equivalence check.
+        std::string tampered = txJson;
+        auto const needle = std::string(R"("Amount":"1000000")");
+        auto const pos = tampered.find(needle);
+        BEAST_EXPECT(pos != std::string::npos);
+        tampered.replace(pos, needle.size(), R"("Amount":"9000000")");
+
+        auto const tamperedSig = signBody(alice, tampered);
+        Json::Value mismatched = parsed;
+        mismatched[jss::TxnSignature] = strHex(tamperedSig);
+        mismatched[sfJsonTxBody.jsonName] = strHex(tampered);
+
+        STParsedJSONObject mismatchedObj("tx", mismatched);
+        BEAST_EXPECT(static_cast<bool>(mismatchedObj.object));
+        STTx const mismatchedTx(std::move(*mismatchedObj.object));
+
+        // Signature now verifies over the tampered body...
+        BEAST_EXPECT(static_cast<bool>(jsonTx::checkSignature(mismatchedTx)));
+        // ...but structural equivalence fails.
+        BEAST_EXPECT(!jsonTx::checkStructuralEquivalence(mismatchedTx));
+    }
+
+    void
+    testHelperEmptyAndMissing(FeatureBitset features)
+    {
+        testcase("helpers on non-jsontx STTx");
+        using namespace jtx;
+
+        Env env{*this, features};
+        Account const alice{"alice"};
+        env.fund(XRP(1000), alice);
+        env.close();
+
+        // A noop signed classically carries no sfJsonTxBody.
+        auto const jt = env.jt(noop(alice));
+        BEAST_EXPECT(!jsonTx::hasBody(*jt.stx));
+        BEAST_EXPECT(jsonTx::body(*jt.stx).empty());
+        BEAST_EXPECT(jsonTx::bodyHash(*jt.stx) == uint256{});
+    }
+
+    void
+    testWithFeats(FeatureBitset features)
+    {
+        testEnabledGate(features);
+        testBasicRoundtrip(features);
+        testMissingParams(features);
+        testInvalidJson(features);
+        testBadSignature(features);
+        testSignatureOverDifferentBytesFails(features);
+        testWrongSigningPubKey(features);
+        testHelperDirectly(features);
+        testHelperEmptyAndMissing(features);
+    }
+
+public:
+    void
+    run() override
+    {
+        using namespace jtx;
+        auto const sa = supported_amendments();
+        testWithFeats(sa);
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(JsonTx, app, ripple);
+
+}  // namespace test
+}  // namespace ripple

src/xrpld/rpc/detail/Handler.cpp

@@ -170,6 +170,10 @@ Handler const handlerArray[]{
     {"simulate", byRef(&doSimulate), Role::USER, NEEDS_CURRENT_LEDGER},
     {"stop", byRef(&doStop), Role::ADMIN, NO_CONDITION},
     {"submit", byRef(&doSubmit), Role::USER, NEEDS_CURRENT_LEDGER},
+    {"submit_json_tx",
+     byRef(&doSubmitJsonTx),
+     Role::USER,
+     NEEDS_CURRENT_LEDGER},
     {"submit_multisigned",
      byRef(&doSubmitMultiSigned),
      Role::USER,

src/xrpld/rpc/handlers/Handlers.h

@@ -145,6 +145,8 @@ doInject(RPC::JsonContext&);
 Json::Value
 doSubmit(RPC::JsonContext&);
 Json::Value
+doSubmitJsonTx(RPC::JsonContext&);
+Json::Value
 doSubmitMultiSigned(RPC::JsonContext&);
 Json::Value
 doSubscribe(RPC::JsonContext&);

src/xrpld/rpc/handlers/SubmitJsonTx.cpp

@@ -0,0 +1,239 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012-2014 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+// submit_json_tx -- prototype json-tx submission path.
+//
+// Request:
+//   {
+//     "tx_json_str": "<exact ASCII bytes the client signed>",
+//     "signature":   "<hex-encoded signature over tx_json_str>"
+//   }
+//
+// Pipeline:
+//   1. Parse tx_json_str as JSON.
+//   2. Verify `signature` over the UTF-8 bytes of tx_json_str using
+//      SigningPubKey from the parsed object -- NOT the classical
+//      signing payload.
+//   3. Build an STTx from the parsed object + signature.
+//   4. forceValidity(SigGoodOnly) so downstream code skips the
+//      classical sig check (which would fail -- TxnSignature is over
+//      the ASCII JSON, not over the binary signing payload).
+//   5. Route through the normal Transaction / processTransaction flow.
+//
+// NB: for this to survive peer relay / re-validation a consensus-level
+// change is required: a new `sfJsonTxBody` Blob field that carries
+// tx_json_str on chain, plus an amendment that routes STTx::checkSign
+// through the ASCII bytes when the field is present. This handler is
+// the ingress-side prototype only.
+
+#include <xrpld/app/ledger/LedgerMaster.h>
+#include <xrpld/app/misc/HashRouter.h>
+#include <xrpld/app/misc/Transaction.h>
+#include <xrpld/app/tx/apply.h>
+#include <xrpld/rpc/Context.h>
+#include <xrpld/rpc/detail/RPCHelpers.h>
+#include <xrpl/json/json_reader.h>
+#include <xrpl/protocol/ErrorCodes.h>
+#include <xrpl/protocol/Feature.h>
+#include <xrpl/protocol/PublicKey.h>
+#include <xrpl/protocol/RPCErr.h>
+#include <xrpl/protocol/STParsedJSON.h>
+#include <xrpl/protocol/STTx.h>
+#include <xrpl/protocol/jss.h>
+#include <xrpl/resource/Fees.h>
+
+namespace ripple {
+
+namespace {
+
+NetworkOPs::FailHard
+getFailHard(RPC::JsonContext const& context)
+{
+    return NetworkOPs::doFailHard(
+        context.params.isMember("fail_hard") &&
+        context.params["fail_hard"].asBool());
+}
+
+Json::Value
+invalidTx(std::string const& reason)
+{
+    Json::Value jv;
+    jv[jss::error] = "invalidTransaction";
+    jv[jss::error_exception] = reason;
+    return jv;
+}
+
+}  // namespace
+
+Json::Value
+doSubmitJsonTx(RPC::JsonContext& context)
+{
+    context.loadType = Resource::feeMediumBurdenRPC;
+
+    // Gate the whole RPC on the amendment. Without it, accepting a
+    // json-tx submission would just queue a tx that every peer node
+    // rejects as soon as it re-validates the signature classically.
+    if (!context.ledgerMaster.getCurrentLedger()->rules().enabled(
+            featureJsonTx))
+        return rpcError(rpcNOT_ENABLED);
+
+    if (!context.params.isMember("tx_json_str") ||
+        !context.params.isMember("signature"))
+        return rpcError(rpcINVALID_PARAMS);
+
+    std::string const txJsonStr = context.params["tx_json_str"].asString();
+    if (txJsonStr.empty())
+        return rpcError(rpcINVALID_PARAMS);
+
+    auto sigBlob = strUnHex(context.params["signature"].asString());
+    if (!sigBlob || sigBlob->empty())
+        return rpcError(rpcINVALID_PARAMS);
+
+    // 1. Parse the ASCII JSON.
+    Json::Value parsed;
+    Json::Reader reader;
+    if (!reader.parse(txJsonStr, parsed) || !parsed.isObject())
+        return invalidTx("tx_json_str is not a valid JSON object");
+
+    // 2. Verify the signature over tx_json_str using SigningPubKey.
+    if (!parsed.isMember(jss::SigningPubKey))
+        return invalidTx("missing SigningPubKey");
+
+    auto pkBlob = strUnHex(parsed[jss::SigningPubKey].asString());
+    if (!pkBlob || !publicKeyType(makeSlice(*pkBlob)))
+        return invalidTx("invalid SigningPubKey");
+
+    PublicKey const pk(makeSlice(*pkBlob));
+
+    Slice const msg(
+        reinterpret_cast<unsigned char const*>(txJsonStr.data()),
+        txJsonStr.size());
+
+    if (!verify(pk, msg, makeSlice(*sigBlob)))
+        return invalidTx("signature over tx_json_str failed verification");
+
+    // 3. Build the STTx from parsed + signature + JsonTxBody carrying
+    //    the exact ASCII bytes the client signed. TxnSignature is the
+    //    ASCII-level sig; the classical sig check must be skipped
+    //    (see step 4).
+    Json::Value stTxJson = parsed;
+    stTxJson[jss::TxnSignature] = strHex(*sigBlob);
+    stTxJson[sfJsonTxBody.jsonName] = strHex(txJsonStr);
+
+    STParsedJSONObject parsedObj("tx_json", stTxJson);
+    if (!parsedObj.object)
+        return invalidTx(
+            parsedObj.error.isMember(jss::error_message)
+                ? parsedObj.error[jss::error_message].asString()
+                : "failed to parse tx_json_str into STObject");
+
+    std::shared_ptr<STTx const> stTx;
+    try
+    {
+        stTx = std::make_shared<STTx const>(std::move(*parsedObj.object));
+    }
+    catch (std::exception& e)
+    {
+        return invalidTx(e.what());
+    }
+
+    // 4. Bypass the classical TxnSignature check -- we already verified
+    //    the signature over the ASCII JSON above.
+    forceValidity(
+        context.app.getHashRouter(),
+        stTx->getTransactionID(),
+        Validity::SigGoodOnly);
+
+    auto [validity, reason] = checkValidity(
+        context.app.getHashRouter(),
+        *stTx,
+        context.ledgerMaster.getCurrentLedger()->rules(),
+        context.app.config());
+    if (validity != Validity::Valid)
+        return invalidTx("fails local checks: " + reason);
+
+    std::string buildReason;
+    auto transaction =
+        std::make_shared<Transaction>(stTx, buildReason, context.app);
+    if (transaction->getStatus() != NEW)
+        return invalidTx("fails local checks: " + buildReason);
+
+    try
+    {
+        auto const failType = getFailHard(context);
+        context.netOps.processTransaction(
+            transaction, isUnlimited(context.role), true, failType);
+    }
+    catch (std::exception& e)
+    {
+        Json::Value jv;
+        jv[jss::error] = "internalSubmit";
+        jv[jss::error_exception] = e.what();
+        return jv;
+    }
+
+    Json::Value jvResult;
+    try
+    {
+        jvResult[jss::tx_json] = transaction->getJson(JsonOptions::none);
+        jvResult[jss::tx_blob] =
+            strHex(transaction->getSTransaction()->getSerializer().peekData());
+        jvResult["tx_json_str"] = txJsonStr;
+
+        if (temUNCERTAIN != transaction->getResult())
+        {
+            std::string sToken, sHuman;
+            transResultInfo(transaction->getResult(), sToken, sHuman);
+            jvResult[jss::engine_result] = sToken;
+            jvResult[jss::engine_result_code] = transaction->getResult();
+            jvResult[jss::engine_result_message] = sHuman;
+
+            auto const submitResult = transaction->getSubmitResult();
+            jvResult[jss::accepted] = submitResult.any();
+            jvResult[jss::applied] = submitResult.applied;
+            jvResult[jss::broadcast] = submitResult.broadcast;
+            jvResult[jss::queued] = submitResult.queued;
+            jvResult[jss::kept] = submitResult.kept;
+
+            if (auto currentLedgerState = transaction->getCurrentLedgerState())
+            {
+                jvResult[jss::account_sequence_next] =
+                    safe_cast<Json::Value::UInt>(
+                        currentLedgerState->accountSeqNext);
+                jvResult[jss::account_sequence_available] =
+                    safe_cast<Json::Value::UInt>(
+                        currentLedgerState->accountSeqAvail);
+                jvResult[jss::open_ledger_cost] =
+                    to_string(currentLedgerState->minFeeRequired);
+                jvResult[jss::validated_ledger_index] =
+                    safe_cast<Json::Value::UInt>(
+                        currentLedgerState->validatedLedger);
+            }
+        }
+    }
+    catch (std::exception& e)
+    {
+        jvResult[jss::error] = "internalJson";
+        jvResult[jss::error_exception] = e.what();
+    }
+
+    return jvResult;
+}
+
+}  // namespace ripple