{
  "manageEntity": {
    "action": "Save",
    "entityId": "688332721",
    "entityType": "Track",
    "nonce": "0x6289c96f0f48f79158255447689e3560230528e1855c97a2d0dc24d3a9a26b43",
    "signature": "0xdb17a00eeb94cd105d21109e8afe5387a6833bd5c78e2b17dd8a3dbd2d476417053cc82b77de52fd623d1429a7d48af92e3e916799ae2ff96333ebc59fab15e31b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}