{
  "manageEntity": {
    "action": "Save",
    "entityId": "602873",
    "entityType": "Track",
    "nonce": "0x0abac12c9feeff9779eaf7b4c4fadfa8b9afcafe5f6be46a9446881be8372955",
    "signature": "0x9e3cb0c26cf550375d305c34b728c6ce56216900d8ce9abcb81a19b0efcd4c0c39d974aec5a6a32aa5e3f03ffc91d0f89c18ff9d6101eebf2008f3c17fb79cd61c",
    "signer": "0xd1bC12b8b46f2FAa152aB791052b4a26826F86F5",
    "userId": "481080235"
  }
}