{
  "manageEntity": {
    "action": "Save",
    "entityId": "192889860",
    "entityType": "Track",
    "nonce": "0x4687ac52ce55a04ab84c659323e0846323bbdf66eb8da26440c4a2de3b3e38e1",
    "signature": "0xa4ac07313dc4392b04f73a2c15a5a919f748ead85776e0df456edca6f931a41771501577b4f9549d77c9809f98b2131f2ac416bd85d302277fe91cf7953270351b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}