{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x859a67edc1b6e615199bb4c147c67a155434f48eaed21b8a90ca3ea6331ee982",
    "signature": "0xaf8725fe9fe2eb6198b5d152f235219e5839235e82552131e3dd05f844b1e93c0b0194332e258ad3f683eb45cf120ad4bc473613d3b39be0c6c10c48d3ff86061c",
    "signer": "0x9D1c4f50C97e7dF0473F2ba9DDCc558f30C71C6f",
    "userId": "527112414"
  }
}