{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402319391",
    "entityType": "Track",
    "nonce": "0x8760d539271e4ea828bf210da0a3cd35e0e07972ae24ded0053b2961f6ae75ef",
    "signature": "0xaf8ad96d210007ebc8bbe96f885792aa17d980e778a6d94b67fcb3e7415d71f407299bb1f06c335e7c27c277a3c27899f0c3ad7387a59dc12df028a596f951cc1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}