{
  "manageEntity": {
    "action": "Save",
    "entityId": "2003420366",
    "entityType": "Track",
    "nonce": "0x04917a84262a10e075e435871f343bae68c0ef1f1c4659cfaa15fe2f0b05137b",
    "signature": "0xb3da74874dc738515a6d7b03e57d586f63954d5ae27946b3083bcba3aa4e782c72a0e3d6e7835f87f704caf4a32cec7caf83d0c35bf59800b75baf02554924961c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}