{
  "manageEntity": {
    "action": "Save",
    "entityId": "1303309825",
    "entityType": "Track",
    "nonce": "0xe56c3f047e67cd400b1b6533cf3710e3df5712cd94dfeafc0cb8cdcea66e47a3",
    "signature": "0xdc05df0ec2d51b21ae06c0731aa6c1eab87252842c5f3faaaba1f53027d8f3e923c14f7250febe96d2f9a5876a523c44764a0f6380fce4def1ac1df4523028991b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}