{
  "manageEntity": {
    "action": "Save",
    "entityId": "427509645",
    "entityType": "Track",
    "nonce": "0x82286b8ca20b267d26a79939ce99aaa480d635bf2c7e7a2e2c079f1ca326a619",
    "signature": "0xa7975f07c0ef84855d51c87e7a20de5efd18fb416e9b033c4b95e852ea8fa3ea4da0470314af50218c3d720431bcc252d69347da12f19c2d6e1a5d2eedad38061b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}