{
  "manageEntity": {
    "action": "Save",
    "entityId": "1640882763",
    "entityType": "Track",
    "nonce": "0x107f0131bdd8569f6f8d5cea2111d4b7ad06358a6da09429d9fa0cbaab4bd052",
    "signature": "0xcc2e525e9b3280879b7f7ea72a1acd30ed47aec9012d238840a8bfaf8b1860cd6ac22f3ee57dd5db35ae6a72aeb8d5ac7c9b5df86422a3d5a513cd82ad7f33ab1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}