bitcoin/chainparams.c: Change signet BIP173 name to tbs.

[ZmnSCPxj]

Fixes: #4924

ChangeLog-Changed: signet addresses and invoices now use tbs instead of tb.

[ZmnSCPxj]

This changes onchain bech32 addresses too. I could not find anything on the Internet about the "standard" bech32 address for signet, unfortunately. If the signet onchain addresses must still be tb while Lightning invoices are tbs, that is going to be a larger effort to change.

[vincenzopalazzo]

Just a small comment

[cdecker]

Well, seems we lost the battle to keep the prefixes in sync with bitcoin, which explicitly chose to reuse the tb prefix and the collision.

ACK 3cbe624

[andrewtoth]

err... not sure this should have been merged. Signet is unusable now on master. No signet faucet or wallet will recognize tbs, so unless you already had signet coins in the wallet already you can't use signet :/.

Edit - actually you can still use it with newaddr p2sh-segwit. For sending out you need an intermediate wallet that can generate p2sh-wrapped or legacy addresses if you can't get a non-bech32 address from the recipient.