{
  "manageEntity": {
    "action": "Save",
    "entityId": "873663656",
    "entityType": "Track",
    "nonce": "0x0c03617610195cac9bbe3a7dc7c4df80617a9740aeb6d4276395f8b5b84e171c",
    "signature": "0xfb099b23ed73656829acc0528c66eadb464cff24a62615d52450a5c018b8dfb17866cc0dd2b7f60517d65254450d329f24b2f0e37c1e6b6edf0ae0f7a59552991c",
    "signer": "0x44577d90A171E208f723dEEa39019067c9Dd87E8",
    "userId": "853591809"
  }
}