{
  "manageEntity": {
    "action": "Save",
    "entityId": "1619413475",
    "entityType": "Track",
    "nonce": "0x724010554c6d15e48cf51042059b143edb5fcd3e9c346ef691efc9f83c41497c",
    "signature": "0x513f34dca64f5b7e56a049bfb3c9a3a09c4497437c61c9174bacb07910915b5a3852b4ab4fe2307458c8888535a0e40e9e53305c6f46ecac3ff80c3f8523154d1c",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}