{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6370a44952bb3f50ac81e3bb7d24fe44abf7e8eaf67a7f81b84ee7051548d3f5",
    "signature": "0x3079024ef90fd3a071d7e324a64c5349fc470034540b582609022edfd8323764704c139bf307c503fb3e33308ec9e2a56bfbb58a20f07c36e7e0f60b02e0cd371c",
    "signer": "0x2fff57D5628D87Ce98d02775C9cF63dB765aa6c5",
    "userId": "640804276"
  }
}