{
  "manageEntity": {
    "action": "Save",
    "entityId": "1674422749",
    "entityType": "Track",
    "nonce": "1788650430501865930",
    "signature": "0xca32e1d7b050dcbe42ff2f88720f7bf766704844368e89cb285eb27a3cf6da38082c628f710d000086dfb19a7d870aaea92f66221aec26ed650b613f10fb216e1c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}