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OTL Network, short for Open Transaction Layer, is an open protocol stack for coordinating onchain transactions between regulated counterparties. Fireblocks announced it on May 28, 2026 with more than 30 founding participants, including Checkout.com, MetaMask, Robinhood, eToro, Cross River Bank, and FalconX. The specifications are published at otl.network.
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The project frames itself in one line on its launch page: "Open protocol stack for coordinating onchain transactions." The companion gap statement is equally direct: "Blockchain infrastructure is built. The coordination layer for secure, compliant transactions isn't. Until now, every institution has built it alone." Both quotes are pulled verbatim from otl.network as of May 28, 2026.
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OTL is not a blockchain, not a bridge, and not a custodian. It is a set of shared specifications that let institutions, non-custodial wallets, and (per the launch materials) agentic systems identify each other, exchange compliance data, and coordinate the steps around a transaction before settlement happens onchain. The value transfer itself still runs on existing rails like CCTP, LayerZero, Hyperlane, Wormhole, and the underlying L1s and L2s.
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The problem OTL describes is integration sprawl. Every regulated firm that wants to send stablecoins or tokenized assets to another regulated firm currently builds a bespoke pipeline for identity exchange, Travel Rule data, settlement confirmation, and reconciliation. Multiply that across dozens of counterparties and the cost is real and recurring.
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Fireblocks Co-Founder and Chief Product Officer Idan Ofrat framed it this way in Crypto Briefing's launch coverage: "Regulated institutions have to build bespoke connections to orchestrate their digital asset operations end-to-end. The result is integration sprawl and parallel systems that don't reconcile." Max Rotham of Checkout.com added in the same article that "as onchain activity scales, merchants and institutions need clearer ways to identify counterparties, exchange the right transaction context, and coordinate securely across wallets, chains, and jurisdictions."
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The launch page calls this out at the protocol-design level. Per Fireblocks' OTL post, the gaps OTL targets are reach (bilateral integrations do not scale), coordination (no shared way to initiate transactions, confirm deposits, or query accounts), operations (parallel systems for rails, PII exchange, and reconciliation), and security (no standard way to confirm beneficiary, terms, and identity before settlement).
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OTL's public materials describe a five-layer design: four technical layers plus an application layer. The technical layers are identity, session, transport, and messaging. The application layer assembles those primitives into end-to-end flows for things like deposits, payments, and Travel Rule completion. As of Q2 2026, limited deep technical detail is available beyond this framing.
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Per Fireblocks' announcement, identity covers being able to identify a counterparty and authenticate their messages. Session, transport, and messaging handle how two parties open and run a coordination channel. The application layer composes those into named flows. The first two named flows are "universal deposit" (a standard way to initiate a payment with compliance built in) and "wallet attribution" (decentralized identification of who controls a blockchain address).
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OTL says it builds on existing standards rather than inventing parallel ones. Ledger Insights reports that the specifications reference W3C Decentralized Identifiers, the IVMS101 Travel Rule data model, ISO 20022 message types, and CAIP-19 asset identifiers. That choice matters because compliance and middle-office teams can reuse work they have already done for fiat rails and earlier Travel Rule deployments.
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OTL was founded by Fireblocks and launched with a coalition of more than 30 institutions across crypto-native infrastructure, payments, brokerage, banking, and trading. The founding group spans Checkout.com, MetaMask, eToro, Robinhood, SoFi, Cross River Bank, FalconX, B2C2, Wintermute, Securitize, Coins.ph, Privy, Bridge, MoonPay, WalletConnect, Revolut, Zerohash, Zengo, Zerocap, Orbital, Triple-A, Taptap Send, Tazapay, and Xendit.
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The coalition also incorporates the Blockchain Payments Consortium, organized by Fireblocks in December 2025. BPC members include the TON Foundation, Stellar Development Foundation, Polygon, Solana Foundation, Sui Foundation, Mysten Labs, and Monad Foundation. Their participation pulls L1 and L2 representation into the same conversation as the wallets and institutions.
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A few absences are worth noting. Coinbase, Binance, and Kraken are not listed among founding members, nor are stablecoin issuers Circle and Tether. Ledger Insights flagged this directly. Whether they join later or wait to evaluate is open as of Q2 2026.
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The founding cohort is functionally diverse: payments infrastructure (Checkout.com, Privy, Bridge, MoonPay), retail brokerage (Robinhood, eToro, SoFi), wallet distribution (MetaMask, WalletConnect, Zengo), regulated banking (Cross River), market making (B2C2, Wintermute, FalconX), regional exchanges (Coins.ph, Xendit, Tazapay, Triple-A), and tokenization (Securitize, Zerohash). A separate article in this cluster covers each backer in more depth.
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"Open transaction layer" describes the scope (the full coordination workflow around a transaction, not just one leg of it) and the access model (specifications published publicly, working groups open to contribution). OTL coordinates the lifecycle around onchain value movement: discovery, identity, payment terms, compliance data, delivery confirmation, and reconciliation. The actual settlement runs on existing chains.
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"Open" here means three things, per the launch materials. Specifications are published on otl.network. Working groups are described as "public and open source" and "open for feedback and collaboration from day one." The protocol is positioned as something no single vendor controls, with the explicit framing from Idan Ofrat that "a standard like this isn't something any single vendor can ship."
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"Transaction layer" is doing specific work in the name. OTL is not handling the value-transfer leg. CCTP still burns and mints USDC across chains. Hyperlane still moves messages between rollups. Ethereum, Solana, Tron, and other L1s still produce the settlement blocks. What OTL aims to standardize is the wrapper: who is involved, what they need to know about each other, what compliance evidence accompanies the transfer, and how completion gets confirmed.
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OTL sits at a different layer than transport rails, intent routers, or new chains. Bridges and CCTP move value between chains. Bridge aggregators and intent routers pick the best path for a given transfer. L2s scale execution on top of L1 settlement. OTL standardizes the coordination, identity, and compliance signals that sit above all of that.
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Intent routers like Across, LI.FI, and Relay focus on routing optimization for builders and treasuries: given a stablecoin transfer from chain A to chain B, find the cheapest, fastest path. OTL focuses on coordination between counterparties: regardless of how the value moves, get the two firms aligned on identity, compliance, and confirmation. The two layers compose; they do not substitute.
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OTL is also distinct from closed institutional networks. Fireblocks acknowledged this directly in its launch post: the existing Fireblocks Network provides a "trust perimeter for institutional transactions" within its customer base, but "as soon as a customer transacts with a counterparty outside of the Fireblocks Network, it stops working." OTL is the open-protocol answer to that closed-network limit.
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As of Q2 2026, OTL has a launch page, a Fireblocks announcement post, press coverage, a five-layer architectural sketch, two named application flows (universal deposit and wallet attribution), and a founding-member roster. What it does not yet have publicly is detailed protocol documentation, reference implementations, a published governance charter, or live integration metrics.
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The verifiable surface area is narrow on purpose. OTL launched as a coordinated industry announcement on May 28, 2026, with specifications "open for feedback and collaboration from day one." That is a different posture from a finished protocol with v1.0 docs and SDKs.
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What is not yet public: the governance model, the reference implementation timeline, fee or hosting economics if any apply, conformance testing, and whether non-founding members can join working groups directly. Most of these are normal early-protocol open questions and will likely surface in working-group documents over the coming months.
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What is verifiable today: the founding-member list (cross-checked across otl.network, Fireblocks' announcement, Crypto Briefing, and Ledger Insights), the layer model and reference standards, the two named first flows, and the framing quotes from Fireblocks executives.
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The primary public surface is otl.network, which hosts the launch page and is described as the home for the open specifications. For ongoing coverage, Fireblocks' OTL blog post is the most detailed first-party source available as of Q2 2026. Crypto Briefing and Ledger Insights both published launch-day analysis with executive quotes.
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For builders working on stablecoin routing and cross-chain transfers today, OTL targets a different problem and a different audience. Eco Routes, an intent-routing layer for stablecoin transfers, serves builders and treasuries above transport rails like CCTP and Hyperlane. OTL serves institutional counterparties coordinating around onchain settlement. Both layers are likely to coexist as the stack matures.
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OTL Network backers explained: Checkout.com, MetaMask, eToro, FalconX, B2C2, Coins.ph, Cross River
​What is a coordination layer in crypto?
​OTL Network vs traditional crypto settlement workflows
​Where OTL fits in the crypto infrastructure stack
​Stablecoins explained: the pillar guide
​CCTP explained: Circle's cross-chain transfer protocol
​What is a DEX aggregator?
​What is a bridge aggregator?
​The GENIUS Act and stablecoin regulation
​MiCA explained: the EU crypto rulebook
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Sources and methodology. Founding-member list, mission statement, and architecture description cross-referenced across otl.network, Fireblocks' OTL launch post, Crypto Briefing, and Ledger Insights as of May 28, 2026. Executive quotes pulled from primary press coverage on that date. Where public material was thin, claims were softened or omitted rather than inferred. Updated May 2026.
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