curl --request POST \
  --url https://toncenter.com/api/v3/message \
  --header 'Content-Type: application/json' \
  --data '
{
  "boc": "<string>"
}
'

{
  "message_hash": "<string>",
  "message_hash_norm": "<string>"
}

{
  "code": 123,
  "error": "<string>"
}