{
  "manageEntity": {
    "action": "Save",
    "entityId": "355982862",
    "entityType": "Track",
    "nonce": "0xa294df40595a42cd81644f87d9c2d42fe28f3d08ac959acc8b6e8cef9b89bdda",
    "signature": "0xfa9d84051b7d6a7d5ea128d8d4640cc236fb52777ffe8bd79a3d6aaace8b1e6e24463a15ab293c3e96b0f221f7d62031245c95ed9c8735bf147c1587af0be0911c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}