{
  "manageEntity": {
    "action": "Save",
    "entityId": "250941",
    "entityType": "Track",
    "nonce": "0xe25919876cb66d7f80878f56624e92c87b84366437978c42a94c4224ccf8f680",
    "signature": "0x23f7fcabf43cb50b00f84922ecc13a4fa9fb8e8c2c945e453345205f950fb04a1f27f064182f17053d037e611ae3e1fae436dd42e924e92abc8f67334636b3d31c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}