{
  "manageEntity": {
    "action": "Save",
    "entityId": "1641727641",
    "entityType": "Track",
    "nonce": "0x9a7b60ceedefdae4bb60236606d20390f8bb8cea09f2759fc0aec130b152dc9b",
    "signature": "0x4582bfa6a294c49c113866902ef0738489adc85a1892ff1768a234671b8d2d47224c0778caa1477ae5b89dc914104b9faa1e30a228c873af06dba02520acbcff1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}