{
  "manageEntity": {
    "action": "Save",
    "entityId": "470500317",
    "entityType": "Track",
    "nonce": "0xbd42db9f4df3c77e99b1d3c353f2be4e4b759f043aa9c05a2bc71c83bb9206ec",
    "signature": "0x15b98f563c2bd46d5bb598c8acffe9cadfd9a6c64f8b7901afbfdb7d98990c5c7ebfe55cce69c23e099dfe4de32bbb4bd9b286813fc82ce1607074b738f96b501c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}