{
  "manageEntity": {
    "action": "Save",
    "entityId": "1457548108",
    "entityType": "Track",
    "nonce": "0xb77a9d5e5bff6d1c20d1f494a9a430f60ccc905eccb6b6fe53e96748b3cd0724",
    "signature": "0x1e75275a4e81964aa5c564b0fbe1e86d723407a87c0e0493fb527a7a2e024cfe5e611d566bd3ee6218df705fdb11058afdf6757b9461f2c8f36631987b284d8a1b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}