{
  "manageEntity": {
    "action": "Save",
    "entityId": "1754173151",
    "entityType": "Track",
    "nonce": "0x3141ecc83924a8399cf6d607c643ce23da7c5e3d0534a00f03de7b2d84932590",
    "signature": "0xe495377ae9101ed2171a48e400e3a713b92096e5b131156c349ba2eb228a6ac33fb0cb1230ef11df43e0696634807b013054a1561c37eb96c4d7def8d6c15acd1b",
    "signer": "0x849b8180f084363b37768C823c174C9786020A66",
    "userId": "817339612"
  }
}