{
  "manageEntity": {
    "action": "Save",
    "entityId": "546473874",
    "entityType": "Track",
    "nonce": "0xa5f10ff8bee69fc2fbf98d5a30490b6d5fe738c82b5d6d07e56c1aef9fc2e394",
    "signature": "0x03877f33ccc8e2026a27bc0ea32bbee0f340190973d719efae76ac46ae0f17a2337dc175f091520a09df61a743b2ad30ec68bb0fc3dee47db254581fe56610be1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}