{
  "manageEntity": {
    "action": "Save",
    "entityId": "1468674921",
    "entityType": "Track",
    "nonce": "0x74c670bfe4ecd08076c81a3e4f68bc7af1dbdc9191ba134b02b9f512a2c06d80",
    "signature": "0x1aae4d01bc2b12cdae0413981444726d557b4c9163c58cd609ffd3f2bff74b2810676b99450c5bebbc658e8dbca7ab92693a4664de11bc3551004ccbc0e608f81c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}