{
  "manageEntity": {
    "action": "Save",
    "entityId": "138461126",
    "entityType": "Track",
    "nonce": "0x15deb279372eca647ed46bb9576049be3efee3265bd15784ee9985379b6ee7c6",
    "signature": "0xb7ca0603a639d8c98f2a61891c4f27ff2a8f96171465eb274384a4bea2e3d46236af39b29e4f7bf2abbe35871c8c6c93114d015e109bd2f0ae4ac6e3ee7a3ee01c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}