{
  "manageEntity": {
    "action": "Save",
    "entityId": "298928",
    "entityType": "Track",
    "nonce": "0x0f6731435951f3dee7c1d3990dbb89aa3c3c0f39e687d44c5768af078123c593",
    "signature": "0x88ea5891cff931d1def0c53f9d1421bf3d59448211811e10e1913e8155caefd917a0c9dada442e366405470dcdf326b55852aae1d65691afb98be3ad14278ec11c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}