sidestr wallet

A wallet for a sidestr chain that needs nothing of the chain's producer: it reads and validates the chain from a mirror (the same chain.json, blocks.json, blocks.dat the explorer uses), keeps your key in the browser, signs spends in the page, and sends them to a Nostr relay as kind 23500 events, where the producer picks them up. SPEC section 11.

Open index.html?chain=<chain id> (the wallet asks the relays for the signer's tip announcement, which names the mirrors, and takes the one whose chain.json names the announcer as signer) or index.html?mirror=<mirror URL>. It follows the announcements live, so a new block shows within seconds, and it marks the mirror ✓ or ⚠ against the signer's announced tip. The engine and libraries load from pinned commits on jsdelivr; ?lib=, ?cdn= and ?explorer= override them for development.

wallet.mjs is the logic with no DOM, so node test/wallet-test.mjs --mirror <URL> (or --chain <id>) exercises it against a live chain: identity, coins and maturity, a real signed spend checked with the curve's verifier, codec round-trip, address handling; --send publishes it and waits for the mirror. Keys are stored unencrypted in the browser, as the BLAKE wallet does: small amounts.

Signing with a browser signer

With an extension that offers window.nostr.sidestr (proposals/browser-signer.md; Podkey is the reference), the page offers "use my extension's key": it stores only the public key, builds each spend unsigned (build({ pub, ... }), same layout and fee as a signed one), and signWith(browserSigner(), built) hands it to the extension, which resolves the chain itself, shows the spend in its own window and signs only its own coins. The answer is held to the txid that was built and to a validator's check of every signature before it is published, from a throwaway event key as always. The EVM, peg-ins and the desk sign other things (an Ethereum transaction, a parent transaction) and still need the key in the page. node test/signer-test.mjs checks the round trip against a stand-in signer.