{
  "manageEntity": {
    "action": "Save",
    "entityId": "889991178",
    "entityType": "Track",
    "nonce": "0x12e2215fb7c8f8a4178db9ee2fbc932fcee0273595de2ae346aa70fce60e8d07",
    "signature": "0x53abbd46a0eab1f9cef31842c8e69d9bd52c1228e00deb90e73781b6faedf1c961a849bc8d8e02d31725b8bda4299046a24816d52fa2584261157e5888c45fb91c",
    "signer": "0x65EB59bb6C92a37Ff6b3c51d34c0aD3607F751cb",
    "userId": "305838"
  }
}