What is the Default Rounding for 8 digits in Binance,tradingview,etc
There should not be any rounding because all operations are integer operations. The 8 digits is because they calculate using the base unit of Bitcoin, the satoshi, which is 0.00000001 Bitcoin (8 digits). It is calculated as an integer (i.e. calculation uses satoshis, not Bitcoin) multiplied by an integer for the number of bytes, thus the result will also be an integer. The decimal then comes back as they shift the decimal point to represent the value in Bitcoin. There is no rounding involved, if there is, you are doing something wrong.