Analysis of the C library's schnorrsig_sign showed three key differences:
1. C takes a pre-computed keypair (no pubkey derivation during signing)
2. C does NOT self-verify the signature after signing
3. C does 1 EC multiplication total; we were doing 3
Changes:
- signSchnorrInternal: extracted core signing logic without pubkey derivation
or self-verification. Does exactly 1 mulG (for R = k·G) matching the C library.
- signSchnorr: convenience overload that derives pubkey then calls internal.
Now ~2x faster since self-verify is removed.
- signSchnorrWithPubKey: fast path accepting a 33-byte compressed pubkey
(includes y-parity in the 02/03 prefix). Skips the pubkey G multiplication
entirely. ~4.8x faster than the previous signSchnorr.
- Secp256k1Instance: added signSchnorrWithPubKey forwarding method.
- Benchmark: added "signSchnorr (cached pk)" test comparing both paths.
The self-verify removal is safe: the BIP-340 test vectors (which include
the exact expected signatures) validate correctness, and the C reference
library does not self-verify either.
Benchmark:
signSchnorr: 1,516 → 2,915 ops/s (1.9x faster, 17x → 9.5x)
signSchnorr (cached pk): N/A → 7,261 ops/s (3.9x vs native — new!)
https://claude.ai/code/session_01BhU63WUe9AhikZxRdw3Lpg
Fixes discovered while porting Namecoin NIP-05 to Primal Android
(PrimalHQ/primal-android-app#934):
1. Race condition: stale intermediate lookups overwrite final result
- Changed map to mapLatest in SearchBarViewModel so that previous
in-flight ElectrumX lookups are cancelled when the query changes
- Without this, typing 'd/testls' character by character causes
stale results from 'd/test', 'd/testl' etc. to arrive after
the correct 'd/testls' result and overwrite it with null
2. CancellationException swallowed in catch block
- mapLatest cancels previous coroutines via CancellationException
- The generic catch was catching it and emitting null, wiping the
valid result. Now re-throws CancellationException
3. Root lookup fails when names object has no underscore key
- extractFromDomainValue tried names[localPart] then names[underscore]
which is the same thing for root lookups
- Now falls back to first available entry for root lookups when
no underscore key exists
- Non-root lookups still fail correctly (no false matches)
4. Global Mutex serializes all lookups
- Single Mutex in ElectrumxClient blocked unrelated lookups to
different servers. A 25s timeout on one server stalled everything
- Now uses per-server mutexes via ConcurrentHashMap
5. customServers set but never read
- NamecoinNameService.setCustomServers() stored the list but the
resolver was constructed with the default serverListProvider
- Now wires customServers through to the resolver
6. resolveLive uses orphaned CoroutineScope
- Now accepts an optional external scope parameter so callers can
tie resolution to their own lifecycle
Adds 2 new tests: root fallback to first entry, non-root no-fallback.
Add censorship-resistant NIP-05 verification using the Namecoin blockchain.
Users can set their nip05 field to a .bit domain (e.g. alice@example.bit)
or direct Namecoin name (d/example, id/alice) and Amethyst will resolve
the pubkey mapping via ElectrumX instead of HTTP.
Resolution uses the standard Electrum protocol (scripthash-based lookups):
- Build canonical name index script matching ElectrumX-NMC indexing
- Query blockchain.scripthash.get_history for the name's tx history
- Parse NAME_UPDATE script from the latest transaction output
- Extract Nostr pubkey from the name's JSON value
Supports both d/ (domain) and id/ (identity) Namecoin namespaces,
simple and extended NIP-05-like value formats with relay hints,
LRU caching with 1h TTL, and self-signed TLS certificates.
New files:
- quartz: ElectrumxClient, NamecoinNameResolver, NamecoinLookupCache
- amethyst: NamecoinNameService, Nip05NamecoinAdapter, NamecoinVerificationDisplay
- docs: namecoin-nip05-design.md
- tests: NamecoinNameResolverTest
Modified:
- Nip05Client: optional namecoinResolver routes .bit to blockchain
- AppModules: wire up resolver
See docs/namecoin-nip05-design.md for full architecture and protocol details.
- Fully converts OpenTimestamp Java codebase to Kotlin, migrating the sync and async HTTP call interfaces to OkHttp and coroutines
- Redesigns parsing of relay commands, messages and filters for performance in Jackson.
- Starts the use of KotlinX Serialization when speed is not a requirement
- Migrates all Jackson field annotations to Kotlin Serialization
- Migrates Regex use in Quarts to Kotlin's Regex class
- Migrates Base64 from Android to Kotlin
- Migrates UUID from Android/Java to Kotlin
- Migrates LRUCache usage from Android/Java to Kotlin collections
- Migrates all String to bytearray conversions to Kotlin methods
- Migrates all System.arraycopy calls to kotlin native ones.
- Separates parsing code from the data classes Companion objects
- Exposes Rfc3986 normalizations to each platform.
- Exposes URI parsing classes to each platform.
- Exposes URL Encoders to each platform.
- Exposes BigDecimal to each platform.
- Exposes the Url Detector to each platform.
- Exposes MacInstances to each platform
- Exposes Diggest instances to each platform.
- Exposes a BitSet to each platform.
- Exposes GZip to each platform.
- Exposes Secp256k1 to each platform.
- Exposes SecureRandom to each platform.
- Exposes Time in seconds to each platform.
- Exposes the LargeCache to each platform.
- Exposes AES CBC and AES GCM encryption/decryption to each platform
- Migrate test assertions to Kotlin Tests
- Exposes Address class to each platform because of the Parceleable
- Creates our own ByteArrayOutputStream.
- Removes Lock features inside the Bloomfilters because we don't need data consistency/
- Migrates UserMetadata parser from Jackson to Kotlin serialization
- Removes the need for Static methods in each tag.
- Adds an event template serializer
- Adds KotlinX Datetime to migrate some of the date-based logs
- Adds support for LibSodium in the JVM platform
- Creates a shared test build for iOS targets
- Fixes several usages of Reflection when serializing classes
- Fixes a bug on loading RelayDB for the HintBloom filter test
- Increases the Bloom filter space to better use hints in the app.
- Removes support for iOS in x86
- Creates a Jackson mapper just for NIP-55, which stays in the Android build only.
- Keeps the event store in the android build as well.
- Removes @Syncronized tags in favor of Mutexes.
- Improved sendAndWaitForResponse NostrClient method to properly account for returns from each relay.
- Removes the need for GlobalScope and async calls in the downloadFirstEvent method.
- Restructures the parser and serialization of the relay messages and commands for performance with Jackson
- Removes the dependency on Jackson's error classes across the codebase.
- Moves the hint to quote tag extension methods to their own packages.
- Speeds up the generation of Bech32 addresses
- Migrates NIP-6 and Blossom uploads to use Kotlin Serialization
Claude