- Why Bitcoin network specially choosen the 10 minute period for allowing the decentralized network to validate a transaction through consensus process?
- Why Bitcoin address always starts with 1 and 3?
If the blocktime is shorter than 10 minutes, there might be a lot of involuntary forks (when two pools find the nonce that solves pow at the same time and there are two valid chains)
Bitcoin addresses that start with 1 are legacy addresses.
Start with 3 are segwit addresses which are compatible with legacy.
There are also bch addresses, that are not compatible with non segwit.