{
  "manageEntity": {
    "action": "Save",
    "entityId": "37108099",
    "entityType": "Track",
    "nonce": "0x849151a8c535ab9c3a0ff1179e8733dc23dd7c66ea5b8fdb1caae3954ab5b921",
    "signature": "0x4377541df60420b4e11a42cc6d01253bd6139066ad1e6686c02e45280524d15f0b73e5e32e7cef5406d98560c38a54588609169810632f89ab56ece78b6b02a31c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}