{
  "manageEntity": {
    "action": "Save",
    "entityId": "1454837842",
    "entityType": "Track",
    "nonce": "0xeaf6c5a0cfea5205b8763cfefd35af6d9d349e1433231292d4bd350ba74774e2",
    "signature": "0xa506f976dfc45e076beb2d502377976afcf8cfa50d2d40de4bbeb9e52b37eb992108f8a6121ce4d9e39cd3f37785a87ffc5d0087d16a3b5cd6c4b6ed0b7e3c821c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}