{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x02047eb16c0810674a827a80f86eebc831664cb1986d4c81ca8e5a7d11ef15a9",
    "signature": "0xb81bbb80663fbfd9901b28c02249aa88eaa0cc1271b2f1ffc1c8b24b29a12c68282dbcf20cf0fceec1694b3a5cb6afe1ded5e414c103df2c09e9124e1ccbdfca1c",
    "signer": "0x850651f846cc7Baa00FE2894e6086f8087eA375b",
    "userId": "737654695"
  }
}