{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x59d23b94271e06b7bd23f0d28bf385a7d21a8c52a45d4d77c27d2a4478095b8c",
    "signature": "0xf1f62d21ff544559d9f2373271ccf9b47edfea728628d2a7bb1acae34608ff710043cc0496bf7f7e22bd646a2c5e500164b943562e1169b7925cbfc6fb9166fb1c",
    "signer": "0x76C3c7e2126f85ed20008B94A2d9686d822EB9A2",
    "userId": "970440408"
  }
}