{
  "manageEntity": {
    "action": "Save",
    "entityId": "641838173",
    "entityType": "Track",
    "nonce": "0x4fd108f41dab773d46bf1a63730b115573590f82f9a868c30854a72815510285",
    "signature": "0x08491d6d597f0ae4369ad0e644b3a1e7932f395fbc47ef24e44041da5771921f713d8da517db5db1473143cac889cd8260eb6fc5971d60f5999fbafdf23edcb91b",
    "signer": "0x868cDCaCaad507eE1eFBbDc02862A479cA5e1433",
    "userId": "614649001"
  }
}