{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x58d6fc79a134935af25d568380edd319356fe9f5af8a9e13669bdc04b1ede26a",
    "signature": "0x763bdc99d01135eeedac8db49e5f222431e6658f667cf8d68d79956a4fe33674359eb914009e2bd97af93b7c4a2395d0651068c4db17b211fd0e22b7e84fcb0b1c",
    "signer": "0x7f78AC105A4fCA67422D94402f8c3F2d9734a36c",
    "userId": "388106302"
  }
}