{
  "manageEntity": {
    "action": "Save",
    "entityId": "1886415871",
    "entityType": "Track",
    "nonce": "0x1c4e992cd4c7541d9df1f5d9d0c42e9d417871fb7df7d78cb05709f90e417278",
    "signature": "0xc7ce777a935ec2c5c89be3d1b1feeaf6c35eb172414ddda53f9152192c19a34329ffd1ace8630897432fc5adb79194d8f7d104388780c665f94ec3c1a0fb5e7a1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}