{
  "manageEntity": {
    "action": "Save",
    "entityId": "1903138077",
    "entityType": "Track",
    "nonce": "0xe4de8cf13bbcd17aff9e3fbc0dc9387ef43583620e619e28099946896adb8489",
    "signature": "0x29882906dfa88e2c628c6b087ea55a2d7521fb0f0c35d798ffd3220ca4b8b80167278597a165eb81617ff3833d2af8e2b9c4b63ebe0fdeff432f543615beea431b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}