{
  "manageEntity": {
    "action": "Save",
    "entityId": "123106642",
    "entityType": "Track",
    "nonce": "0xe445b8d6b93e4749496ee9534f45a90a6bbd2381f0f2c79d3222d20d80c3fc40",
    "signature": "0x263e04023c17f615e59053f7d3cc8f0aa401fa22cfe4e821dd56187d205833af484b250d07ffff1df5cc47e0f43a90dc72c393b550feb57fc81cc420471ab0eb1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}