{
  "manageEntity": {
    "action": "Save",
    "entityId": "640073332",
    "entityType": "Track",
    "nonce": "0x71a4de54c5183ba06de2dbb9da92e7e04223c140afea617c4143259491856f35",
    "signature": "0xbf7d18bfd976951f4de710e80e13f71630006f7f87d798357db5fcc702177a6b3729d8f2277cd4f5fbfa4f82d0e009c1f6bffe8565905f6405d23017a48f377b1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}