{
  "manageEntity": {
    "action": "Save",
    "entityId": "511223",
    "entityType": "Track",
    "nonce": "0x7edc132d4afa243e90eb7253f461bc938ca8e46ca15953c1aeddce6ca9cf4c71",
    "signature": "0x7b699de768210b93df7b87ed41fa14e6ed859f387d25a5bf0948fdbd76a626d7124f65cb18f4075780f18110ec57dd04e2e133a2d9472546f33b8c03457dabe91b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}