{
  "manageEntity": {
    "action": "Save",
    "entityId": "648616916",
    "entityType": "Track",
    "nonce": "0x4bcb3ffa4b8f445f1c9dbb604b7d26bae4c113dc535c9fc3cc1ed6b00fe919f8",
    "signature": "0xdafee6e07e465d84cbdbedfefd3650d2fcb35a82e74444ed931d829e4ac727604a7960b40f461d1c83c505757a007fc0767787f32e24b5d7e85d84612ee5f9b51c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}