{
  "manageEntity": {
    "action": "Save",
    "entityId": "212261402",
    "entityType": "Track",
    "nonce": "0x7b5beb31908e0bb5c40641ca62b32c84cadc0fb61daa67816741802ba4fd3565",
    "signature": "0xa1e15403a85f368543fcf8a32d61d4a02aef51b706d184c885376daa4901b3dd49d3af7ab509a288adc67301359cb04e793a67781034fa3fdb9daa095eda2d221c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}