{
  "manageEntity": {
    "action": "Save",
    "entityId": "579147944",
    "entityType": "Track",
    "nonce": "0xb3604965c50086349ec6ee8f95c4a9c2b783efcc76516a8dad40d117e9f88cd1",
    "signature": "0x02c4b97599dc2e9626fed11f4e2cb5e33559d5827c6344b7e84b7d2b3ab874744e12598cfc7bff9461587b05054f13938ab3ebc21db3b5392640476f4d0c98141c",
    "signer": "0xc03cf24b1C519dA6a18B6509c7F5C57d01620755",
    "userId": "870665506"
  }
}