{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9c920b6c74ca71fbfef29d414cdf63a3d22baa2c50aace5dac57a1b9dd69cc23",
    "signature": "0xd1f34930bf9ac25b84a1b91088f5e6999f308901e965ea945f31fc1b32e65e976d4ac4ea26c01a13d8be9172cd56d81b0feb579e8327fb595d5471d5255de46b1b",
    "signer": "0x8509FA910112951c1cCF369302cC2511fB4523c8",
    "userId": "770559151"
  }
}