{
  "manageEntity": {
    "action": "Save",
    "entityId": "443113440",
    "entityType": "Track",
    "nonce": "0x0c7b8cd2c72f69675b6f65dae660c3735d167c0008f6bffe168562075dc391de",
    "signature": "0x8b233e4ee7b4d5bb2fb8a6c0f8cc52b622f26a6239c66af2bdd030268858c576627c8cbc90f519bef22fb95e2dc037bfdddebbd142cf805956bc0c6f7cf04c7b1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}