{
  "manageEntity": {
    "action": "Save",
    "entityId": "489610",
    "entityType": "Track",
    "nonce": "0x68accd1cb805473acb440b4d093cdac99256dc8ec252965a0b09940c733c9044",
    "signature": "0xfb0463e639bb73603ff8b682af521fa3110933b3e53a7fc8c7cbc7275323d17220364ae5b5c972b6caa3857f046fba984bf9262cd2f23705fff93ec2f64e79c31c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}