{
  "manageEntity": {
    "action": "Save",
    "entityId": "1519610455",
    "entityType": "Track",
    "nonce": "0xb449d23c49b86d1ff057a14cfe240892c6532419921d6e4149684378294d19be",
    "signature": "0x04fe4dc551c74f0376faf4a06c97540dc8304fda643bd23d67d7fac97ff48d51294c5381543aae1e4131157c63b3aabd692505fabd4d395ff891b34d735850e61b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}