{
  "manageEntity": {
    "action": "Save",
    "entityId": "1253253167",
    "entityType": "Track",
    "nonce": "0x6dc9c179a6093374fd9a9659526150cac6a0d77dd621ffd397da0800be59ad01",
    "signature": "0x7f7c204459f11f797e1fc83ccdf6102c7f2e15383c2655f7f8d87c2ce36d5df6495c834aca7b93f904dca27acc43ea72ada93cbd62515492b0dbd6dd8b541f8f1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}