lightning-address
Lightning Address (LUD-16): email-style identifier resolving to LNURL-pay endpoint. [email protected] → /.well-known/lnurlp/user. USE WHEN: building/registering Lightning Addresses, designing resolver / payer wallet logic.
What this skill does
# Lightning Address A Lightning Address looks like an email: `[email protected]`. It's a **human-friendly identifier** that resolves to a LNURL-pay endpoint. Spec: LUD-16 in `github.com/lnurl/luds`. ## Resolution ``` input: [email protected] GET https://domain.com/.well-known/lnurlp/user Accept: application/json → same JSON as LNURL-pay (LUD-06): { "tag": "payRequest", "minSendable": 1000, "maxSendable": 100000000, "metadata": "[[\"text/plain\",\"Pay [email protected]\"]]", "callback": "https://domain.com/lnurl/pay/user/callback" } ``` From there, standard LNURL-pay flow. ## Server implementation A simple Lightning Address server: 1. Web server with `/.well-known/lnurlp/<user>` endpoint per user. 2. Backend connects to LN node (LND, CLN, LDK, phoenixd). 3. On `<callback>?amount=...`, generate BOLT11 invoice, return JSON. 4. Forward incoming Lightning payments to user's account. Custodial: server holds keys. Non-custodial: server forwards via LSP / NWC to user-controlled wallet. ## Provider examples - **getalby.com** — custodial. - **Wallet of Satoshi** — custodial. - **Phoenix** — non-custodial via custom resolver. - **LNbits** — self-hostable. - **BTCPay Server** — self-hostable. - **Zaprite** — service for businesses. - **bitcoin-vn-net** — open-source self-host. ## Privacy - Same as email: server sees who pays whom. - No public-key leak (LNURL handles that). - Receiver privacy depends on whether final hop is custodial. ## Compared to BOLT12 | Aspect | Lightning Address | BOLT12 Offer | |--------|-------------------|--------------| | Human-friendly | yes | partial (longer string) | | Self-custodial possible | depends on server | yes natively | | Spec-level | LUD-16 (LNURL) | BOLT12 | | Universal wallet support | yes (most) | partial (CLN, LDK best) | | Privacy from server | no (server sees) | better (blinded paths) | | HTTP dependency | yes | no (onion messages) | ## DNS / hosting Most users get a Lightning Address via a service. Self-host: - Buy domain. - Run `phoenixd` or `LNbits` etc. - Configure web server to serve `/.well-known/lnurlp/<user>`. ## Common bugs - Failing to handle `min/maxSendable` boundary correctly → wallet rejects. - Description_hash mismatch (forgot to update when changing metadata). - HTTP instead of HTTPS — wallets reject. - Caching `/.well-known/lnurlp/<user>` aggressively → stale callback URLs after server restart. ## See also - [lnurl/SKILL.md](../lnurl/SKILL.md) - [bolt12/SKILL.md](../bolt12/SKILL.md) - [../../infrastructure/btcpay/SKILL.md](../../infrastructure/btcpay/SKILL.md)
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