{
  "manageEntity": {
    "action": "Save",
    "entityId": "355719412",
    "entityType": "Track",
    "nonce": "0x5731a2edc2de2562ed3d3bb3ace8ace7a3d499725e9191263992441deb5a6c38",
    "signature": "0x50ca6d3c1d002d005b362350850934d06053e5184058415ff73595cc7e028200014f4b2dc74527e3c08d047da7f362d5892b0ecaf2a7a95bc1fa0c83baaddfee1c",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}