{
  "manageEntity": {
    "action": "Save",
    "entityId": "857554012",
    "entityType": "Track",
    "nonce": "1789167599970945247",
    "signature": "0xa6ed2cfcaad8899d4a812223f8f247b50619eb1774bb4d3f11e94db2ac7a08e726599020f4c9f09cd84bde31ef0c8dae58e52ae7904b22ce1f2fc2a62636952f1c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}