{
  "manageEntity": {
    "action": "Save",
    "entityId": "578673",
    "entityType": "Track",
    "nonce": "0x55cd0ddef7f03a70c7ea80de5f32216fc472d91372857448ccbea362c3deae6b",
    "signature": "0x39568476d74ab94ed92b4aae576bf16ca3e323f82f40755d756b6018b610b0453a6c72eda9fdf5118c15088d7b8748914c35cb696a72d81b5afcbe814a79beb81b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}