{
  "manageEntity": {
    "action": "Save",
    "entityId": "372914686",
    "entityType": "Track",
    "nonce": "0x3f64a028e1c5880aca702f83853394a5091a22b68554f624c4ea556edc52f8f4",
    "signature": "0x76b4fe2ff7dba694b5c836c8bb3d70d0c8a513fe5490d0a5de40b7d97e9f72aa4df18a1273b57635bbb5394791011d610ab5299a72d656bdfaeb392d053396d11b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}