{
  "manageEntity": {
    "action": "Save",
    "entityId": "399592648",
    "entityType": "Track",
    "nonce": "0x83aaba9e08b47603d80d08307b672289aa8e9fcd57a67d415186a3d7365b294e",
    "signature": "0xe87a3016f8972f0eb9ecd2ec4d22ff6a46ea31854afcb53a10f49420a76b52b725db2d0bb817c695a286f6d37657a3697ec3f3b1a03ddc0a3b77d81f30e496e81c",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}