{
  "manageEntity": {
    "action": "Save",
    "entityId": "420918",
    "entityType": "Track",
    "nonce": "0x341b46de38147a0a607737e5d54dc46986985f06d2bf35c0a59df487ab292d88",
    "signature": "0xc77ecf34c0c75e8d2caae1c59d02c68447d520b0381800847a7ed96f1ed4921222631ff0c8f5e7c85a4529e0f774c6928171d047c3addf87e87cd6f78c3923a51c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}