How to change the format of addresses on a substrate local blockchain?

Question

I have run a local node on my local host using the substrate documentation at:

https://docs.substrate.io/tutorials/build-a-blockchain/build-local-blockchain/

Also I git cloned the UI Frontend for displaying the details.

As you know on a Polkadot blockchain, or a local node created using the substrates, addresses are in 3 different formats as below:

Chain address type Address:

Polkadot (SS58):
    15oF4uVJwmo4TdGW7VfQxNLavjCXviqxT9S1MgbjMNHr6Sp5

Kusama (SS58):
    HNZata7iMYWmk5RvZRTiAsSDhV8366zq2YGb3tLH5Upf74F

Generic Substrate chain (SS58):
    5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY

I want to know if and how we can change the format of these addresses on a Generic Substrate chain.

for example we want the addresses to begin with these three letters: "aml".

Is there any way to make that happen on a local blockchain and how?

Thanks in advance for your help.

Answer 1

Change it here.

https://github.com/paritytech/substrate/blob/f0c14f387baba0688afa9422a9bc24068d431716/bin/node-template/runtime/src/lib.rs#L200

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And the letters depend on the ss58 hash algorithm.

The prefix range is 0 ~ 65535(u16::MAX). Maybe some of these numbers will derive the aml starting.

It's impossible to specify the letters manually.

Good luck!