{
  "manageEntity": {
    "action": "Save",
    "entityId": "2121137650",
    "entityType": "Track",
    "nonce": "0x9172b0898d50df993b0d6683199e028f71c2dd1e52560b7aa730470a53fe3e65",
    "signature": "0xf2d4ee68424d8b75193fabd4f7217314b207bdf82da59606247c5cec476b87966bf3063b8f6f78fdf8c6168857ca02c0201347ef6cb6344b5932b239f91b65801b",
    "signer": "0x9c3B758948f27dCECee5f39438D5E15d6e82FB67",
    "userId": "283863311"
  }
}