{
  "manageEntity": {
    "action": "Save",
    "entityId": "387596",
    "entityType": "Track",
    "nonce": "0xce5ab903840e732ebe562f08eada5a611ec3ec282eb1eb36ff543fbe9d9404d8",
    "signature": "0x0c5067f34a509b7de199481eb9692bafea103eb737d57b411f1c56a02648bc9e75c9af30ec5db42842956f5e7d57b342dcd591f1530398ef94bf9c991eb1fb9f1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}