{
  "manageEntity": {
    "action": "Save",
    "entityId": "639800176",
    "entityType": "Track",
    "nonce": "0x4e7fe73aaadabb25b7665904a3cd4db322d24b52082a667cf086414fd3aca7ff",
    "signature": "0x8d5b54dbbe8c7480a4e1a5379e0bd5b3fd7435c9b15a911b7f15f035ab1ff2a713933c7657938fd1b05c64e303c79ab8e8d3964695fb42a5ca4ae2b0b16b01ae1c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}