{
  "manageEntity": {
    "action": "Save",
    "entityId": "978221895",
    "entityType": "Track",
    "nonce": "0xb727adaac7354d58b8e405e9e8e37a34d36a092cc4b8accd43a957b27ef2a1a7",
    "signature": "0x08a3eab706fafcecbe39e39d57a20b312ea0ee1688945a50794281c74e588ffb3d4beb55ba1d9c578d4fd62dfbef4de8a48fbe462e0160b39e9e46cfc9affb691c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}