Subject: [PATCH] setup wizard: ask for a wallet, not a mailbox

The installer is the one place in WordPress where the fork cannot do its
work from a plugin. It runs before plugins load, and it refuses to finish
without an email address, so a site with no mail identity cannot be
installed at all.

The change is the smallest one that removes the requirement:

  - "Your Email" becomes "Your wallet address", and it is optional. The
    installer has nothing to verify a signature against yet — the site
    does not exist — so an address typed here is taken on trust and can be
    replaced from the profile screen afterwards, where it CAN be proved.
  - The two is_email() gates become one address check.
  - wp_install() still receives an email string, because its signature and
    everything downstream of it expects one. It gets a permanently
    unroutable .invalid placeholder.

The two helper functions are defined by the Sirius Press bootstrap
must-use plugin, which loads before this file on every request including
the installer. If that plugin is missing, they fall back to accepting
nothing and the installer behaves as it does on stock WordPress minus the
email field.

Applies to: WordPress 7.1.1
--- a/wp-admin/install.php
+++ b/wp-admin/install.php
@@ -101,6 +101,8 @@
 	$weblog_title = isset( $_POST['weblog_title'] ) ? trim( wp_unslash( $_POST['weblog_title'] ) ) : '';
 	$user_name    = isset( $_POST['user_name'] ) ? trim( wp_unslash( $_POST['user_name'] ) ) : '';
 	$admin_email  = isset( $_POST['admin_email'] ) ? trim( wp_unslash( $_POST['admin_email'] ) ) : '';
+	// Sirius Press: the identity field on this form is a wallet address.
+	$admin_wallet = isset( $_POST['admin_wallet'] ) ? trim( wp_unslash( $_POST['admin_wallet'] ) ) : '';
 
 	if ( ! is_null( $error ) ) {
 		?>
@@ -175,9 +177,9 @@
 		</tr>
 		<?php endif; ?>
 		<tr>
-			<th scope="row"><label for="admin_email"><?php _e( 'Your Email' ); ?></label></th>
-			<td><input name="admin_email" type="email" id="admin_email" size="25" aria-describedby="admin-email-desc" value="<?php echo esc_attr( $admin_email ); ?>" />
-			<p id="admin-email-desc"><?php _e( 'Double-check your email address before continuing.' ); ?></p></td>
+			<th scope="row"><label for="admin_wallet"><?php _e( 'Your wallet address' ); ?></label></th>
+			<td><input name="admin_wallet" type="text" id="admin_wallet" size="25" class="code" aria-describedby="admin-wallet-desc" value="<?php echo esc_attr( $admin_wallet ); ?>" autocapitalize="off" autocomplete="off" spellcheck="false" />
+			<p id="admin-wallet-desc"><?php _e( 'Sirius Press: your Bitcoin Cash address is your account. Leave this blank to attach one later from your profile &mdash; until then the password above is the only way in.' ); ?></p></td>
 		</tr>
 		<?php $blog_privacy_selector_title = has_action( 'blog_privacy_selector' ) ? __( 'Site visibility' ) : __( 'Search engine visibility' ); ?>
 		<tr>
@@ -411,10 +413,20 @@
 		$user_name            = isset( $_POST['user_name'] ) ? trim( wp_unslash( $_POST['user_name'] ) ) : '';
 		$admin_password       = isset( $_POST['admin_password'] ) ? wp_unslash( $_POST['admin_password'] ) : '';
 		$admin_password_check = isset( $_POST['admin_password2'] ) ? wp_unslash( $_POST['admin_password2'] ) : '';
-		$admin_email          = isset( $_POST['admin_email'] ) ? trim( wp_unslash( $_POST['admin_email'] ) ) : '';
+		$admin_wallet         = isset( $_POST['admin_wallet'] ) ? trim( wp_unslash( $_POST['admin_wallet'] ) ) : '';
 		$public               = isset( $_POST['blog_public'] ) ? (int) $_POST['blog_public'] : 1;
 
-		// Check email address.
+		/*
+		 * Sirius Press: there is no email step. The account identity is a
+		 * CashAddress, and it is optional here because the installer has nothing
+		 * to verify a signature against yet — the site does not exist. An address
+		 * typed now is attached below; an administrator who leaves it blank
+		 * attaches one from their profile afterwards, where they can prove it.
+		 */
+		$admin_wallet = sirius_press_install_address( $admin_wallet );
+		$admin_email  = sirius_press_install_stub_email( $admin_wallet );
+
+		// Check the username and password.
 		$error = false;
 		if ( empty( $user_name ) ) {
 			// TODO: Poka-yoke.
@@ -427,19 +439,20 @@
 			// TODO: Poka-yoke.
 			display_setup_form( __( 'Your passwords do not match. Please try again.' ) );
 			$error = true;
-		} elseif ( empty( $admin_email ) ) {
-			// TODO: Poka-yoke.
-			display_setup_form( __( 'You must provide an email address.' ) );
-			$error = true;
-		} elseif ( ! is_email( $admin_email ) ) {
-			// TODO: Poka-yoke.
-			display_setup_form( __( 'Sorry, that is not a valid email address. Email addresses look like <code>username@example.com</code>.' ) );
+		} elseif ( false === $admin_wallet ) {
+			display_setup_form( __( 'Sorry, that is not a valid Bitcoin Cash address. Leave the field blank if you would rather attach a wallet after installing.' ) );
 			$error = true;
 		}
 
 		if ( false === $error ) {
 			$wpdb->show_errors();
 			$result = wp_install( $weblog_title, $user_name, $admin_email, $public, '', wp_slash( $admin_password ), $loaded_language );
+
+			// Sirius Press: record the administrator's wallet so they can sign in
+			// with it immediately.
+			if ( '' !== $admin_wallet && ! empty( $result['user_id'] ) ) {
+				update_user_meta( (int) $result['user_id'], 'sirius_wallet_address', $admin_wallet );
+			}
 			?>
 
 <h1><?php _e( 'Success!' ); ?></h1>