{
  "manageEntity": {
    "action": "Save",
    "entityId": "984454",
    "entityType": "Track",
    "nonce": "0x389446ac76ae797c7dc4369790daa520e2f3936fb7f1caf5dc6a0de684e014fb",
    "signature": "0x3c8be62474a4add7cf0bf142fe128ebffbbfa64072d76c3d92f373c5832510067869c5f704eaada428bd2db641260104dc96cc478a99f54936ae6d6ac06fb0d51b",
    "signer": "0x44577d90A171E208f723dEEa39019067c9Dd87E8",
    "userId": "853591809"
  }
}