Does a bitcoin address have to start with a number?

No, there are 1, 3 and bc1, which represent the following:

The address at the beginning of 1 is P2PKH(pay-to-public-key-hash) address, which is the original address, and is called ordinary BTC address;

The address at the beginning of 3 is P2SH(pay-to-script-hash) address, and the internal address also needs to be segwit, that is, the segwit address.

The address at the beginning of bc1 is a BECH32 encoded address, an address format developed specifically for segwit, and an segwit address.

The address at the beginning of 3 and bc1 are smaller and less expensive than that of 1, which can improve the packaging speed of BTC block.

2.On the Accelerate page, CoinPocket will provide the best Gas fee for the user automatically. Users are able to complete the transaction by one-click, without having to adjust the number. Meanwhile, users are also allowed to accustom the Gas fee.

3.Confirm the acceleration and payment. Enter the password to complete the process.