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Bold Bitcoin Wallet 4.1.1

Seedless, secure Bitcoin wallet using Threshold Signatures.

filecart Android Updated Oct 30, 2026
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About Bold Bitcoin Wallet

BoldWallet is an open-source next-generation Bitcoin wallet that eliminates traditional security tradeoffs and single points of failure.
It uses Threshold Signatures (2of3) over your mobile devices -- no internet needed for setup or signing.

Features:
o ? Seedless setup using Threshold Signature Scheme (TSS)
o No seed phrases, no paper backups, no hardware wallets
o up to 3 device-based key generation with 2 devices needed for signing
o PSBT-Signer compatible with wallets like Sparrow, Electrum, etc.
o P2P encrypted protocol between your devices, over Nostr or Local/Wifi-Hotspot
o No internet required for setup or signing
o Open-source, verifiable, and offline-capable
o Supports Mempool.space public or self-hosted for enhanced advanced privacy

License: Apache-2.0
Release info Update on Oct 29, 2026
Release notes BoldWallet v4.1.1 - Native confirmations, Testnet4, and sync polish

? What's new

Enhanced Signing
o Native confirm -- PSBT signing and a BTC send each open a native sheet bound to that exact payload. A swapped or unbound payload stops the session.
o OS prompt -- setup, signing, and other sensitive bridge calls need a short-lived ceremony token minted by the system biometric or device-credential prompt. Cancel revokes it.
o Shares stay native -- keyshare plaintext no longer crosses into JavaScript on save, import, or read. Clipboard copy is metadata only (npub / pub key / suite).
o Existing GG18 wallets -- they keep routing and signing. No forced migration.

Backups
o AES-256-GCM + Argon2id -- versioned backup files, random salt per file. Older CBC backups import once and re-export in the new format.
o Import check -- the file's pub_key must match the share's group key and ciphersuite.
o Export password -- backup export uses the full password policy.
o Rooted-device warning -- backup export, airgap export, wallet delete, and keyshare inspect warn and ask you to confirm when the device looks rooted, jailbroken, or instrumented.

Pairing checks and fee bounds
o Three-phone LAN -- trio setup agrees a key with a spoken 6-digit code (SAS-authenticated ECDH). A phone still on the old handshake stops setup instead of continuing.
o Group-key check -- after keygen, LAN and Nostr (DKLs and GG18) compare group keys and abort before saving if they differ. Mixed-version ceremonies with older peers can still finish.
o Fee sanity -- mempool rates above 10,000 sat/vB are skipped, and the fee is bounded against the amount you are sending.
o Pinned lists -- mempool hosts and Nostr relays come from a reviewed commit, with size limits and strict https: / wss: checks.

Testnet4, sync, and wallet chrome
o Testnet4 -- chain params, address prefixes, and the default API are Testnet4. Stored testnet3 keys and URLs normalize on read. Regtest and mainnet stay as they are.
o Separate provider pools --...
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