{
  "manageEntity": {
    "action": "Save",
    "entityId": "758944",
    "entityType": "Track",
    "nonce": "0xa2740d05a2d21e85403005402c2eab2a5e0629ca1f509ddd3d5d586739ff9af9",
    "signature": "0x84634d9d71b853efa127f9baf8227c3bd6c17817042d29528bf4f867e8b38115671012b771860a0a1048418f69582cd55117137f0bb99ff5614848a9a4a074031b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}