{
  "manageEntity": {
    "action": "Save",
    "entityId": "756739860",
    "entityType": "Track",
    "nonce": "0x84e4969faf531377199a880dac83bcfcd14bf3d9a7eaf3dfe8742e2c775389c0",
    "signature": "0x1fabb32cb63f6e11cbd295a9f8a5843c7a574755811c6aa2c4317f3cfaff9b9951a33b6dd57ffd18bcd8cf7e1937c12ff73a60f12a9dec661019bcd2884b15c21b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}