Uppercasing BECH32 address and schema in QR code

Uppercase QR codes are easier to scan, so we should make the effort to uppercase whatever characters we can in the URI.

Since Bech32 addresses are already uppercased by default in Bitcoin Core I expect that shouldn’t be a problem. Upper-casing the schema could be a different beast… but so far in my testing it seems that only CashApp implemented this in a wrong fashion. Also, before I changed it last year, BtcPayServer was uppercasing schema component of QR Code URI.

To make sure we’re not creating problems for merchants, this time I would prefer we first test which wallets support different format and then decide whether:

1. We will uppercase BECH32
2. We will uppercase schema
3. We will do both

List of tested wallets

Here is the list of wallets tested so far, feel free to contribute by testing with wallets you have.

Wallet Name	BITCOIN:BECH32	BITCOIN:bech32	bitcoin:BECH32	bitcoin:bech32	Validated By
Atomic Wallet	✔️	✔️	✔️	✔️	@brijananand
BitBoxApp	✔️	✔️	✔️	✔️	@Stadicus
BitBoxApp for Android	✔️	✔️	✔️	✔️	@Stadicus
Bitcoin Wallet Android (Schildbach)	✔️	✔️	✔️	✔️	@freerko
Blockchain Info	❌	❌	❌	❌	@pavlenex
Blockstream Green	✔️	✔️	✔️	✔️	@britttttk
BlueWallet	✔️	✔️	✔️	✔️	@britttttk
BLW Android	✔️	✔️	✔️	✔️	@anitaposch
BRD	❌	❌	✔️	✔️	@pavlenex
Breze	✔️	✔️	✔️	✔️	@Kixunil @brijananand
BTCPay Server	✔️	✔️	✔️	✔️	@pavlenex
Casa	✔️	✔️	✔️	✔️	@jlopp
CashApp	✔️	✔️	✔️	✔️	@britttttk
Coinbase Wallet	❌	❌	✔️	✔️	@Fichte42
Coinomi	✔️	✔️	✔️	✔️	@rockstardev
Copay	❌	❌	❌	❌	@anitaposch
Eclair	✔️	✔️	✔️	✔️	@rockstardev
Edge	✔️	✔️	✔️	✔️	@pavlenex
Electrum 4.0.8	✔️	✔️	✔️	✔️	@pavlenex
Electrum Android	❌	❌	✔️	✔️	@LinoxBE @anitaposch
Exodus	✔️	✔️	✔️	✔️	@Fichte42
Fully Noded	❌	✔️	❌	✔️	@pedromvpg
Hexa Wallet	❌	❌	✔️	✔️	@mutatrum
Ledger Live Desktop	❌	✔️	❌	✔️	@onyb
Ledger Live iOS	❌	✔️	❌	✔️	@woutersamaey
Lighting by L.Labs	❌	❌	❌	❌	@brijananand
Moonshine	✔️	✔️	✔️	✔️	@pedromvpg
Muun	✔️	✔️	✔️	✔️	@Fichte42
Mycelium iOS	❌	❌	❌	❌	@britttttk
Mycelium 3.7.0.5 - Android	✔️	✔️	✔️	✔️	@vjsingh-lite
Phoenix	✔️	✔️	✔️	✔️	@Kixunil
Samourai	❌	❌	✔️	✔️	@Kixunil
Shakepay	✔️	✔️	✔️	✔️	@aiouy
Specter Desktop	❌	❌	❌	❌	@mutatrum
Strike	✔️	✔️	✔️	✔️	@rockstardev
Trezor (wallet.trezor.io)	❌	❌	✔️	✔️	@schulzemic
Trezor Suite	✔️	✔️	✔️	✔️	@prusnak
Trust	✔️	✔️	✔️	✔️	@Fichte42
Wallet of Satoshi	✔️	✔️	✔️	✔️	@Kixunil
Wasabi	✔️	✔️	✔️	✔️	@johnsBeharry
Zap	✔️	✔️	✔️	✔️	@britttttk
Zeus	❌	❌	❌	✔️	@davterra
Bitcoin.com (owned by Roger Ver, scammer)	❌	❌	✔️	✔️	@pavlenex

How to test

A) Scan the following QR codes from your wallet.

1. BITCOIN:BECH32

BITCOIN:BC1Q6APR55WRXTDTK3CJ6M69MXAYW99VVGTVDNVUNT?amount=0.00005142

2. BITCOIN:bech32

BITCOIN:bc1q6apr55wrxtdtk3cj6m69mxayw99vvgtvdnvunt?amount=0.00005142

3. bitcoin:BECH32

bitcoin:BC1Q6APR55WRXTDTK3CJ6M69MXAYW99VVGTVDNVUNT?amount=0.00005142

4. bitcoin:bech32

bitcoin:bc1q6apr55wrxtdtk3cj6m69mxayw99vvgtvdnvunt?amount=0.00005142

B) Report results in the comments in table view if possible. For example Wallet| No | Yes | Yes | Yes |

DO NOT SENT ANY FUNDS. Just test if the QR codes above can be scanned and report.

[rockstardev]

All right gents, I’ll open PR for uppercasing BECH32 by the end of the week, but rollout will go easy and slow as we build awareness… and keep an eye if we can uppercase more parts of URI.

[kaloudis]

Zeus is adding support for all cases with this PR: https://github.com/ZeusLN/zeus/pull/411. Will squeeze this into v0.5.0 and will be available for testing from v0.5.0-beta1 and onwards.

Shouts to @rockstardev for the reminder.