diff --git a/src/node/api/http.py b/src/node/api/http.py
index e5f8944..dd75c13 100644
--- a/src/node/api/http.py
+++ b/src/node/api/http.py
@@ -21,6 +21,21 @@ if TYPE_CHECKING:
 logger = logging.getLogger(__name__)
 
 
+def normalize_info_payload(data: dict) -> dict:
+    """Normalize cryptarchia/info responses.
+
+    Current nodes wrap the fields under "cryptarchia_info" and report mode as
+    a (possibly nested) object like {"Started": "Online"}; flat payloads with a
+    plain string mode pass through unchanged.
+    """
+    info = dict(data.get("cryptarchia_info", data))
+    mode = data.get("mode", info.get("mode"))
+    while isinstance(mode, dict):
+        mode = next(iter(mode.values()), "Unknown") if mode else "Unknown"
+    info["mode"] = mode if isinstance(mode, str) else str(mode)
+    return info
+
+
 class HttpNodeApi(NodeApi):
     # Paths can't have a leading slash since they are relative to the base URL
     ENDPOINT_INFO = "cryptarchia/info"
@@ -79,7 +94,7 @@ class HttpNodeApi(NodeApi):
         url = urljoin(self.base_url, self.ENDPOINT_INFO)
         response = requests.get(url, auth=self.authentication, timeout=60)
         response.raise_for_status()
-        return InfoSerializer.model_validate(response.json())
+        return InfoSerializer.model_validate(normalize_info_payload(response.json()))
 
     async def get_block_by_hash(self, block_hash: str) -> Optional[BlockSerializer]:
         url = urljoin(self.base_url, self.ENDPOINT_BLOCK_BY_HASH + block_hash)
diff --git a/src/node/api/serializers/fields.py b/src/node/api/serializers/fields.py
index c687776..894fb95 100644
--- a/src/node/api/serializers/fields.py
+++ b/src/node/api/serializers/fields.py
@@ -28,6 +28,17 @@ def bytes_from_int(data: int) -> bytes:
     return data.to_bytes((data.bit_length() + 7) // 8)  # TODO: Ensure endianness is correct.
 
 
+def bytes_from_hex_or_intarray(data: str | list[int]) -> bytes:
+    """Node versions drifted between int arrays and hex strings for byte fields.
+
+    Older nodes (<= 0.1.2) serialize bytes as int arrays; newer nodes serialize
+    them as hex strings. Accept both so the explorer works across node versions.
+    """
+    if isinstance(data, str):
+        return bytes_from_hex(data)
+    return bytes_from_intarray(data)
+
+
 def bytes_into_hex(data: bytes) -> str:
     return data.hex()
 
@@ -35,3 +46,6 @@ def bytes_into_hex(data: bytes) -> str:
 BytesFromIntArray = Annotated[bytes, BeforeValidator(bytes_from_intarray), PlainSerializer(bytes_into_hex)]
 BytesFromHex = Annotated[bytes, BeforeValidator(bytes_from_hex), PlainSerializer(bytes_into_hex)]
 BytesFromInt = Annotated[bytes, BeforeValidator(bytes_from_int), PlainSerializer(bytes_into_hex)]
+BytesFromHexOrIntArray = Annotated[
+    bytes, BeforeValidator(bytes_from_hex_or_intarray), PlainSerializer(bytes_into_hex)
+]
diff --git a/src/node/api/serializers/transaction.py b/src/node/api/serializers/transaction.py
index 3ffab43..0f156dd 100644
--- a/src/node/api/serializers/transaction.py
+++ b/src/node/api/serializers/transaction.py
@@ -1,17 +1,21 @@
 from random import randint
-from typing import List, Self
+from typing import List, Optional, Self
 
 from pydantic import Field
 
 from core.models import NbeSerializer
+from node.api.serializers.fields import BytesFromHex
 from node.api.serializers.operation import LedgerOpSerializer, MantleOpSerializerField
 from utils.protocols import FromRandom
 
 
 class TransactionSerializer(NbeSerializer, FromRandom):
     ops: List[MantleOpSerializerField]
-    execution_gas_price: int = Field(description="Integer in u64 format.")
-    storage_gas_price: int = Field(description="Integer in u64 format.")
+    # Newer nodes include the canonical tx hash in mantle_tx; older ones don't.
+    hash: Optional[BytesFromHex] = Field(default=None, description="Canonical tx hash (newer nodes only).")
+    # Gas prices were dropped from mantle_tx on newer nodes; default to 0 there.
+    execution_gas_price: int = Field(default=0, description="Integer in u64 format.")
+    storage_gas_price: int = Field(default=0, description="Integer in u64 format.")
 
     @classmethod
     def from_random(cls) -> Self:
diff --git a/tests/fixtures/block_new_format.json b/tests/fixtures/block_new_format.json
new file mode 100644
index 0000000..44332da
--- /dev/null
+++ b/tests/fixtures/block_new_format.json
@@ -0,0 +1,37 @@
+{
+  "header": {
+    "id": "d266fec335ecf2bfb713db1c5bf389e21fd80d208a9ef01989da6aef3deae7b4",
+    "parent_block": "c4afbf0d3a99fbcb624295a6626ad2786ec181e02522467c55489eb72fe81ce1",
+    "slot": 13240353,
+    "block_root": "ac4d5d879a87da6b62a1e1c97840a73372cfef8fd8b7b454d5fbef66e21b1365",
+    "proof_of_leadership": {
+      "proof": "bf5f85bf2f664ac55bc0116e75d5ba44d36935935ea53df24cc23bdff10b16a87ec8a60cfd8414b29a50e3467f091c00ae7b2ad4edeedfa6c610de50b4051d249c62e8a0b99e99005ba4b1342c524569150bc8cd58a9d31bda86f5a23d7d858e1094b87b9db5866f998e4aea806b9c3c346b945cb10ba2e4b51c22931bbe901a",
+      "entropy_contribution": "1a5b15d2ef474acf2f1ef7e46e40967f9bd6ccd5bf1877a85350e6294ddad90a",
+      "leader_key": "a38c8d8d2e560cd21cf9cf856bb7e93fff41fa6a3ab0991945c3761ee7a20d50",
+      "voucher_cm": "c4ecf502b774020f2a70474720b4de25653fe8ad56853085725dc6c56b00a405"
+    }
+  },
+  "transactions": [
+    {
+      "mantle_tx": {
+        "hash": "9e00ebfc1d641adaeecaf0e20c09ffed78a84fd2f36b790b94cf64f758260348",
+        "ops": [
+          {
+            "opcode": 17,
+            "payload": {
+              "channel_id": "0101010101010101010101010101010101010101010101010101010101010101",
+              "inscription": "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",
+              "parent": "77007291cc00a4ad150d79afe4068008ec662dc3f7e1b70358a427cb03ba6de7",
+              "signer": "7d1726d002f952db5be1a2f534f8b4bafe429c8e56f6a42c8c6f9faa3aa59b06"
+            }
+          }
+        ]
+      },
+      "ops_proofs": [
+        {
+          "Ed25519Sig": "307e8225cc3ccd3ea4a2a0de7509aa90a85453cb9d4fb2f56e1c36f83cd00ebf33805807f45fb6ddb332a1caa1c096ea8a95bb2135a500014174a71a256fa50a"
+        }
+      ]
+    }
+  ]
+}
\ No newline at end of file