{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf5f910acef281d34e29ff6b61d00fd41ad57ff33bab45b8be36be8e3bd34b226",
    "signature": "0x1f853c0814de9d8229a098ce0db3bbd43e4909de4fc5e48423435fac52b2a8774477e70c1258313422a4ea5b49c4905bd8c596b2e39f05f7d738f543283198c81b",
    "signer": "0x27fe505A105a761994196F32091F5672586FD0cF",
    "userId": "537528609"
  }
}