{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x407e6e08dff1572065aa20fc58b5ae45478cab11321ca0c08ff94d7eedd56285",
    "signature": "0x4ab11e7166411399bfcfb960b41f7fda8a6fb3bcefd359bbb59fc260f112e3ed27c5f98f35bf062e6cc53c892c16b5d5349006895bc86b5c818ba3db21aed1031c",
    "signer": "0x3f2E908c00078F96019EfA0C5c6846101d8637Ab",
    "userId": "439962241"
  }
}