{
  "manageEntity": {
    "action": "Save",
    "entityId": "486981702",
    "entityType": "Track",
    "nonce": "1785444689353329916",
    "signature": "0x6dee8dc989af1ee6a6ceded8e9c43b0d47eb58c344af3a66f5c287f06342461e59d53b542c205566f254009cec0119ae96acb0741ac89e29c3a65a406f3d8ffe1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}