{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x529e4b712a332de938497ca0868bd83ad551f654c958738b3e2754c3514e82c6",
    "signature": "0xee3e4797c95fad3e65d58b7d5629c02e6e139d0e1651f0c9f9273457a2e2421b0a2718c3832d72fdb06e555f9c2275cae67e10a04e0bed4023c699a56a0f96bd1b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}