{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4c8802c0a4bfaba7c78c37d35254e56820ca59ab841c3d6148cc2e720ecbd69a",
    "signature": "0xe80e32474c524fe8d259f2b9a27c475eb8f4bd71a69af7d7bbc3ba7caca9e48405fd0b21527971b037d01010955e976857775d741ffebc2b97c6f2fe5c5cc7fc1b",
    "signer": "0x0F0A5d21312dD5C2d4013D6E19057c2045C3f2A9",
    "userId": "560525085"
  }
}