{
  "manageEntity": {
    "action": "Save",
    "entityId": "876811609",
    "entityType": "Track",
    "nonce": "0x549e60f1544b78b17d3b58327dfbccabe012ee60ec831515641c86c4f01d12fb",
    "signature": "0x478a93eff02f561992f530ce0129bfd0fa1053aed52b4b0999e4b3dfd90242fc26006ea343ad68751e0079123e0fb69130ec6dec8fdfff9fd7f9f82d5f084a811b",
    "signer": "0xD07A680d4F48bA7Cc076c23f40870AccBbad1987",
    "userId": "16411799"
  }
}