diff --git a/app/api/routes/_blockchain.py b/app/api/routes/_blockchain.py
index 5c41eaf..cffccb6 100644
--- a/app/api/routes/_blockchain.py
+++ b/app/api/routes/_blockchain.py
@@ -1,4 +1,4 @@
-from base64 import b64encode
+from base64 import b64encode, b32decode
 from datetime import datetime
 import traceback
 
@@ -7,7 +7,7 @@ from sqlalchemy import and_, select, func
 from tonsdk.boc import begin_cell, begin_dict
 from tonsdk.utils import Address
 
-from base58 import b58encode
+from base58 import b58encode, b58decode
 from app.core._blockchain.ton.connect import TonConnect, wallet_obj_by_name
 from app.core._blockchain.ton.platform import platform
 from app.core._config import PROJECT_HOST
@@ -72,12 +72,78 @@ async def s_api_v1_blockchain_send_new_content_message(request):
         except BaseException:
             # New path: treat provided string as encrypted IPFS CID (ENCF v1)
             encrypted_ipfs_cid = request.json['content']
-            class _EC:  # tiny adapter to mimic .serialize_v2()
-                def __init__(self, s: str):
-                    self._s = s
+
+            class _EC:
+                """Adapter to provide ContentId-like interface for IPFS CID strings."""
+
+                def __init__(self, cid_str: str):
+                    self._cid = cid_str
+                    self.content_hash = self._extract_content_hash(cid_str)
+                    self._content_hash_b58 = None
+
+                @staticmethod
+                def _decode_multibase(cid_str: str) -> bytes:
+                    if not cid_str:
+                        raise ValueError("empty CID")
+                    prefix = cid_str[0]
+                    if prefix in ('b', 'B'):
+                        payload = cid_str[1:]
+                        padding = (-len(payload)) % 8
+                        return b32decode(payload.upper() + ('=' * padding), casefold=True)
+                    if prefix in ('z', 'Z'):
+                        return b58decode(cid_str[1:])
+                    # CIDv0 (base58btc without explicit multibase prefix)
+                    return b58decode(cid_str)
+
+                @staticmethod
+                def _read_varint(data: bytes, offset: int):
+                    result = 0
+                    shift = 0
+                    while True:
+                        if offset >= len(data):
+                            raise ValueError("truncated varint")
+                        byte = data[offset]
+                        offset += 1
+                        result |= (byte & 0x7F) << shift
+                        if not (byte & 0x80):
+                            break
+                        shift += 7
+                        if shift > 63:
+                            raise ValueError("varint overflow")
+                    return result, offset
+
+                @classmethod
+                def _extract_content_hash(cls, cid_str: str) -> bytes:
+                    data = cls._decode_multibase(cid_str)
+                    offset = 0
+                    if data and data[0] == 0x01:
+                        version, offset = cls._read_varint(data, offset)
+                        if version != 1:
+                            raise ValueError("unsupported CID version")
+                        _, offset = cls._read_varint(data, offset)  # skip codec
+                    code, offset = cls._read_varint(data, offset)
+                    length, offset = cls._read_varint(data, offset)
+                    digest = data[offset:offset + length]
+                    if len(digest) != length:
+                        raise ValueError("truncated multihash digest")
+                    if code != 0x12 or length != 32:
+                        raise ValueError("unsupported multihash (expect sha2-256)")
+                    return digest
+
                 def serialize_v2(self, include_accept_type: bool = False):
-                    return self._s
-            encrypted_content_cid = _EC(encrypted_ipfs_cid)
+                    return self._cid
+
+                @property
+                def content_hash_b58(self) -> str:
+                    if self._content_hash_b58 is None:
+                        self._content_hash_b58 = b58encode(self.content_hash).decode()
+                    return self._content_hash_b58
+
+            try:
+                encrypted_content_cid = _EC(encrypted_ipfs_cid)
+            except Exception as exc:
+                make_log("Blockchain", f"Provided encrypted IPFS CID is invalid: {exc}", level='error')
+                raise AssertionError("Invalid encrypted content CID provided") from exc
 
         if request.json['image']:
             image_content_cid, err = resolve_content(request.json['image'])