{
  "manageEntity": {
    "action": "Save",
    "entityId": "177704272",
    "entityType": "Track",
    "nonce": "0x16e35708cf93c6b0f2d7ca56ffc38f9e30f9c9381e9d6f8ae530ff7154b16171",
    "signature": "0xf306c37501393d5b9a273ffcf499cb81ff1c1d99ae982e2f5ed4e29f9605b5e92893ea862d00fbe76a018f52532eea098f22d9024166df46e4af53081d2e71921c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}