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24 listings: companies working with bitcoin — Lightning and node infrastructure, custody providers, bitcoin-backed lenders, banking and rewards services, treasury companies, and staking and yield protocols.
18 are in the ₿ USE · TOOL group, 2 in INFO · SERVICE, 2 in PROTOCOL and 2 in TREASURY. 9 support Lightning and 8 are open source. Who holds the bitcoin is stated for 17: 9 Custodial, 2 Shared keys, 2 Group-held, 1 Non-Custodial, 3 with a custody line instead of a class. For the other 7 it is not settled yet, which never means non-custodial. 3 carry a notice. 1 also appears under Exchanges & On-Ramps and Payment Processors.
24 listings, grouped Bitcoin first by label. Inside each group: open source first, then the rest, then listings marked Not recommended, each A to Z here (the interactive directory rotates them weekly). Nothing is hidden. This version needs no JavaScript. Most recent Updated date here: 23 October 2026 (the day a record last changed, not a verification date).
How listings are checked → · The Saylor Playbook →
Bitcoin used directly as money, or tools for running, securing and building on it.
Blockstream ₿ TOOL
Bitcoin and digital asset infrastructure.
Group-held. Blockstream says Liquid is operated by 15 geographically distributed functionary nodes, with 11 of 15 signatures needed per block; its App and Jade wallets are listed separately. Blockstream: Liquid security incident assessment
Advisory · LIQUID PEG-OUTS PAUSED since 6 September 2026 — about 602 BTC not yet recovered, no reopening date (2026-10-12)
Blockstream develops the Liquid sidechain and published the incident report. On 6 September 2026 an attacker used a bug in Elements, the software Liquid runs on, to create about 4,000 L-BTC with no bitcoin behind it, then withdrew about 4,000 BTC from the Liquid reserve through SideSwap, a federation member that can authorise peg-outs. Blockstream says the reserve fell from about 4,205 BTC to 197 BTC, that 3,400 BTC were returned on 7 September, and that about 602 BTC are still the subject of recovery efforts; on 12 October 2026 the third-party explorer liquid.network (The Mempool Open Source Project) showed about 3,632 BTC in the reserve against about 4,235 L-BTC in circulation. Blockstream’s co-founder and CEO, Adam Back, wrote on X on 10 September that the 1:1 peg would be covered (“answer YES”); he did not say how or when. Blockstream deployed an emergency patch within hours, Liquid transactions resumed on 10 September, and Blockstream says other Liquid-issued assets were not affected. Peg-outs (the way to turn L-BTC back into bitcoin through the federation) remain paused; liquid.net still said so on 12 October 2026. On 17 September Liquid said it could not yet give a firm date and that peg-outs “will resume only after full 1:1 BTC backing for LBTC has been confirmed and all required software updates, testing and independent security reviews have been completed.” On 29 September it said an independent external security audit of Elements v23.3.4 was underway and that the federation was updating its peg-out key list, replacing existing entries and securing all peg-out keys in cold storage; it said it expected to share further updates “shortly”, and by 12 October it had posted none.
Our position: listed, with this notice, because Liquid still runs and Blockstream and Liquid have published what happened and what has to happen before peg-outs reopen. Until peg-outs reopen, L-BTC cannot be turned back into bitcoin through the federation; bitcoin held on-chain is separate and not affected. The facts above come from Blockstream’s incident report, posts on X by Liquid and Adam Back, liquid.net and the liquid.network explorer — check them yourself.
Sources: Blockstream: “Liquid Network Security Incident Assessment” (23 September 2026) · Liquid Network on X: update of 29 September 2026, 05:48 UTC (audit of Elements, new peg-out keys) · liquid.net (peg-out status, checked 12 October 2026)
Coinkite ₿ USE
Makers of Coldcard, Opendime, and Bitcoin hardware.
Non-Custodial. Only you hold the keys to your bitcoin. Coinkite: Home
Advisory · Security advisory — Coldcard seed-generation flaw (2026-10-12)
A firmware bug weakened seed generation on Coinkite's Coldcard: Mk2 and Mk3 seeds made on firmware 4.0.1 to 4.1.9, and Mk4, Mk5 and Q seeds made before the fixed firmware (5.6.0, 1.5.0Q; Edge 6.6.0X, 6.6.0QX). The independent tracker coldcardwatch.com counts at least 1,405 BTC taken from 4,925 addresses since 30 July 2026. Updating does not repair an existing seed. Coinkite states that TAPSIGNER, OPENDIME and SATSCARD are not affected (different codebases). As of 12 October 2026 Coinkite has not published the post-mortem it announced on 4 August. See the Coldcard listing in Wallets & Storage for the full notice.
Sources: Coinkite security advisory
Fedi ₿ USE
Federated Bitcoin custody for communities.
Group-held. Fedi says a federation of Guardians holds the shared wallet, and that moving money requires more than two-thirds of the Guardians agreeing. Fedi: Community custody
Lightning Labs ₿ TOOL
Lightning Network infrastructure.
Spiral ₿ TOOL
Lightning Development Kit and Bitcoin research.
Start9 ₿ TOOL
Personal sovereign server for freedom tech.
Anchorage Digital ₿ USE
Federally chartered crypto bank for institutional custody and trading.
Custodial. Anchorage describes itself as a federally chartered, SEC-qualified custodian; its Porto self-custody wallet products come from Anchorage Innovations, which says it is not a custodian. Anchorage: Custody
AnchorWatch ₿ USE
Bitcoin custody with Lloyd's of London insurance.
Custody. AnchorWatch says clients choose between Flagship Custody, where you hold your own private keys alongside AnchorWatch, and Multi-Institution Custody, with keys distributed across three institutions. AnchorWatch: Home
BitGo ₿ USE
Institutional Bitcoin custody and financial services.
Custodial. BitGo says its main product is qualified custody with segregated client assets; its optional self-custody hot wallets give you the Client Key and Backup Key while BitGo keeps the Platform Key. BitGo: Qualified custody
Casa ₿ USE
Collaborative multisig Bitcoin custody for individuals.
Shared keys. Casa says it holds a backup key in each vault (2-of-3, 3-of-5 or 3-of-6) and can never move funds alone; your own keys meet the threshold. Casa: Vault
CoinRabbit ₿ USE
Custodial stablecoin loans with bitcoin as collateral.
Custodial. CoinRabbit’s terms say it acquires ownership of the digital assets posted as collateral and, once the loan is repaid, returns the equivalent amount to your address. CoinRabbit: Terms of use
Fold ₿ USE
Earn Bitcoin on every purchase.
Custodial. Fold’s fine print says bitcoin custody and exchange services are provided by BitGo and are subject to BitGo’s Terms of Use. Fold: Home
Lava ₿ USE
Custodial Bitcoin-backed loans.
Custodial. Lava’s FAQ says keys are held across multiple distributed entities using a distributed key protocol with institutional custodians, and funds are never lent out, traded or rehypothecated. Lava: How are my funds secured?
Ledn ₿ USE
Bitcoin-backed loans and savings accounts.
Custodial. Ledn says loan collateral is held with a qualified independent custodian and may be re-posted only to an institutional USD funding partner, and that neither may lend it out. Ledn: Home
Strike ₿ USE
Instant Bitcoin and Lightning payments for everyone.
Custodial. The company holds the keys to your bitcoin. Strike: US individual terms (Bitcoin Custody)
Unchained ₿ USE
Bitcoin financial services and multisig custody.
Shared keys. Unchained says it holds one key of three in a vault, so you hold two; in a loan, your company, Unchained and Fortis Bank each hold one key and none can move the collateral alone. Unchained: Vaults
Voltage ₿ USE
Lightning payments infrastructure for businesses.
Custody. Voltage’s docs say payments run either on a Voltage line of credit, which received payments are “directly applied to”, or on your own node on Voltage, with “full control over the funds, keys, and node infrastructure.” Voltage Docs: How it works (Payments API)
Xapo Bank ₿ USE
Gibraltar-regulated bank with USD accounts and Bitcoin services.
Custodial. Xapo says it manages the private keys on your behalf, split by multi-party computation so no single entity at Xapo has the full key; its optional BTC Vault adds a 48-hour withdrawal delay. Xapo Bank: Custody
About bitcoin: learn, track or get professional help. No bitcoin moves through them.
JAN3 SERVICE
Accelerating Bitcoin adoption worldwide.
Advisory · LIQUID PEG-OUTS PAUSED since 6 September 2026 — about 602 BTC not yet recovered, no reopening date (2026-10-12)
JAN3 makes the Aqua wallet, which holds L-BTC (bitcoin on the Liquid sidechain) next to on-chain bitcoin. In its service update of 18 September, Aqua said Liquid-to-Lightning swaps were processing through its own Indra service “subject to available liquidity”, that “Swaps from Lightning to Liquid are still unavailable” and that peg-outs remained suspended. On 6 September 2026 an attacker used a bug in Elements, the software Liquid runs on, to create about 4,000 L-BTC with no bitcoin behind it, then withdrew about 4,000 BTC from the Liquid reserve through SideSwap, a federation member that can authorise peg-outs. Blockstream says the reserve fell from about 4,205 BTC to 197 BTC, that 3,400 BTC were returned on 7 September, and that about 602 BTC are still the subject of recovery efforts; on 12 October 2026 the third-party explorer liquid.network (The Mempool Open Source Project) showed about 3,632 BTC in the reserve against about 4,235 L-BTC in circulation. Blockstream’s co-founder and CEO, Adam Back, wrote on X on 10 September that the 1:1 peg would be covered (“answer YES”); he did not say how or when. Blockstream deployed an emergency patch within hours, Liquid transactions resumed on 10 September, and Blockstream says other Liquid-issued assets were not affected. Peg-outs (the way to turn L-BTC back into bitcoin through the federation) remain paused; liquid.net still said so on 12 October 2026. On 17 September Liquid said it could not yet give a firm date and that peg-outs “will resume only after full 1:1 BTC backing for LBTC has been confirmed and all required software updates, testing and independent security reviews have been completed.” On 29 September it said an independent external security audit of Elements v23.3.4 was underway and that the federation was updating its peg-out key list, replacing existing entries and securing all peg-out keys in cold storage; it said it expected to share further updates “shortly”, and by 12 October it had posted none.
Our position: listed, with this notice, because Liquid still runs and Blockstream and Liquid have published what happened and what has to happen before peg-outs reopen. Until peg-outs reopen, L-BTC cannot be turned back into bitcoin through the federation; bitcoin held on-chain is separate and not affected. The facts above come from Blockstream’s incident report, posts on X by Aqua, Liquid and Adam Back, liquid.net and the liquid.network explorer — check them yourself.
Sources: Aqua on X: service update (18 September 2026) · Blockstream: “Liquid Network Security Incident Assessment” (23 September 2026) · Liquid Network on X: update of 29 September 2026, 05:48 UTC (audit of Elements, new peg-out keys)
Ten31 SERVICE
Venture firm investing in bitcoin, energy and AI.
Separate networks or token systems built around bitcoin.
Babylon Protocol PROTOCOL
Bitcoin staking and Bitcoin-collateral infrastructure.
Custody. Babylon’s docs list self-custody as a requirement of its staking design, where stakers “maintain direct control of their Bitcoin”; a covenant committee can execute slashing by majority consensus. Babylon docs: Bitcoin Staking
Lombard Finance PROTOCOL
Yield-bearing Bitcoin (LBTC) and Bitcoin DeFi infrastructure.
Custodial. Lombard’s LBTC terms say deposited BTC becomes the Issuer’s property; its docs say the backing sits with a 14-member consortium and with custodians Anchorage Digital Bank and Kraken Institutional. Lombard: LBTC Product Terms (12 Aug 2026)
Companies that hold bitcoin on their balance sheet. Their shares are not bitcoin: not your keys, not your bitcoin.
Metaplanet TREASURY
Tokyo-listed Bitcoin treasury company.
Not your keys, not your bitcoin. Owning the company’s shares does not give you bitcoin.
Strategy TREASURY
Nasdaq-listed Bitcoin treasury company (MSTR).
Not your keys, not your bitcoin. Owning the company’s shares does not give you bitcoin.