{
  "manageEntity": {
    "action": "Save",
    "entityId": "302971149",
    "entityType": "Track",
    "nonce": "0x945c399ef808f1ce1d8af19970e14a56cf1bf1b512b172e148502456cc63da3e",
    "signature": "0x43ffe036df0027373e3d0bdb40627da69cacf71ec31759b822584a15b4abda93575f97e11d5999665cddb9d782720c52def54ccc3da2a92f973d81bb403127131c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}