{
  "manageEntity": {
    "action": "Save",
    "entityId": "558249234",
    "entityType": "Track",
    "nonce": "0xb6e164fd50fd62fee4cdedef8478eae4e59fb9c321abca6e0400ca047f3d7fcb",
    "signature": "0x59e5a236097c1801a4dc0f2a30f3f40dbd2f3b23c62cb277f6245342245c104e251404b0466e14723a284fb549f5d4264dddb50aeff5f96293fd5fc3b4debe071b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}