{
  "manageEntity": {
    "action": "Save",
    "entityId": "818812935",
    "entityType": "Track",
    "nonce": "0xea28e161d28c818e6f95652666a6a5628f03da9e805cd365069333c6179c431e",
    "signature": "0xc40399a7ffe9fa45e501c4ca8219ef8a44070c5fb2129b798858670838f0c8ce41aa06f205d48c14d2d8d24a43e76ac9d49778136bc2fb172e88bf23f7f47cbc1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}