{
  "manageEntity": {
    "action": "Save",
    "entityId": "490175857",
    "entityType": "Track",
    "nonce": "0x8a9e025841247b49e54228a45e9986ba5585a32be8aff1de7269bb6b35e9e651",
    "signature": "0x167209d0b7afefb008302535e7c6abd544d8158eade7ed2fdc6f74db79b3c9e56b089670f9ae10070c4ff8651667f2273daa419576772a6cb09acc6e92d4e2ae1c",
    "signer": "0x2F1E2f294c3e55dbeFEDe10ec5A6D29646572668",
    "userId": "478987064"
  }
}