OODL — The Bitcoin Intent Layer

Bitcoin Intent Layer · Protocol v1.0

OODL

Beyond Ordinals — The Bitcoin Coordination Layer

Bitcoin transactions are not just payments. They are executable agreements waiting for a counterparty. OODL makes those agreements publicly discoverable and permissionlessly executable — without marketplaces, without escrow, without trust.

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Trusted Operators

Consensus Changes

Bitcoin Layers

∞

Open Participants

Bitcoin Architecture

The Missing Layer

Bitcoin's stack has grown one layer at a time. Each layer made the next possible. Until OODL, coordination was the gap.

Layer 1

Settlement

Irreversible value transfer secured by proof of work. The foundation everything else rests on.

Bitcoin (BTC)

Layer 2

Payments

High-frequency low-latency transfers using pre-signed off-chain channels settling to Layer 1.

Lightning Network

Layer 3

Ownership

Permanent digital artifact storage. Bitcoin as a data layer hosting provable ownership records.

Ordinals / Inscriptions

Layer 4

Coordination

Executable economic agreements published on-chain and fulfilled permissionlessly by any participant. Bitcoin as a global coordination network.

OODL · oodinals.com

Protocol Mechanics

Three-Transaction Lifecycle

Every OODL listing follows a deterministic three-transaction pattern. No custodian holds funds at any stage. Bitcoin validates settlement automatically.

Commit Transaction

Prepare

The inscription is aligned to sat offset zero inside a Taproot carrier output. Protocol fee routing is established for indexer detection.

Inscription aligned to sat offset zero

Taproot carrier output created

Protocol fee routing established

Reveal Transaction

Publish

The seller offer PSBT is embedded in witness data. The intent becomes publicly discoverable on-chain. No sale occurs — only intent is published.

PSBT embedded in witness data

SIGHASH_SINGLE + ANYONECANPAY

Indexers detect via fee routing

Buy Transaction

Execute

Any participant extracts the PSBT, adds funding inputs, applies their signatures, and broadcasts. Bitcoin validates atomic settlement.

Buyer adds funding inputs

Buyer signatures applied

Atomic on-chain settlement

Core Cryptography

The Signature Insight

OODL's trustless guarantee comes from a single Bitcoin signature construction. No new primitives. No smart contracts. Pure Bitcoin.

seller_offer.psbt

// INPUTS

input_1: "buyer_placeholder"

input_2: "buyer_placeholder"

input_3: "seller_inscription"

// OUTPUTS

output_1: "buyer_change"

output_2: "inscription_receiver"

output_3: "seller_payout"

// SIGNATURE

sighash: SINGLE | ANYONECANPAY

commits_to: input_3 + output_3

open_to: any counterparty

// ENFORCEMENT

enforcer: Bitcoin consensus

trusted_party: none

SIGHASH_SINGLE

Seller commits to one input-output pair

The seller's signature locks their inscription input to their payout output. The amount and destination are cryptographically committed. No party can redirect this without invalidating the signature.

ANYONECANPAY

Any counterparty may complete execution

The ANYONECANPAY flag allows unknown future participants to add their own inputs without invalidating the seller's signature. The buyer doesn't need to exist when the offer is published.

Atomic Settlement

Bitcoin validates the whole transaction

Either the inscription transfers and the payment lands simultaneously in one confirmed block, or nothing happens. Partial execution is structurally impossible.

Possibility Space

Beyond Inscription Trading

The OODL intent primitive extends to any economic coordination expressible through Bitcoin transaction structure. Every use case below requires zero consensus changes.

⚡

Inscription Trading

Trustless Ordinals trading with no custodian, no order book server, and no platform risk. Live today at oodinals.com.

Native Bitcoin

📖

Decentralised Order Books

The blockchain is the order book. Any indexer can aggregate visible intents. No matching engine. No operator. No censorship.

Native Bitcoin

🔨

Permissionless Auctions

Block-height expiry fields create time-bounded offers. Dutch auction mechanics through tiered offer stacks. No auction house required.

Native Bitcoin

🎯

Global Bounty Systems

Publish a PSBT committing payment to whoever delivers a specified output. Trustless bounties on Bitcoin. No escrow agent needed.

Partial — Indexer Layer

⛏️

Miner Execution Markets

Miners observe published intents and execute profitable ones directly, earning protocol fees alongside block rewards as subsidies decline.

Native Bitcoin

🤝

Trustless OTC Settlement

Large lot trades without escrow. PSBTs shared privately, executed on-chain. Atomic finality. No arbitration. No custodian.

Native Bitcoin

🔄

Automated Settlement Agents

Wallets publish PSBTs autonomously. The publisher doesn't need to be online at execution time. Bitcoin mediates the interaction.

Native Bitcoin

💸

oodinals.com

The first platform implementing the OODL protocol for Ordinals trading. Self-custody throughout. No accounts. No escrow. Pure Bitcoin.

🔐

Non-Custodial by Design

Your inscription stays in your wallet until the moment of atomic settlement. The protocol enforces this — not a policy.

⚡

Permissionless Listing

Any inscription can be listed without approval. The OODL protocol determines validity, not a platform admin.

🔍

On-Chain Discovery

Listings are indexed from Bitcoin itself. Fee routing outputs make offers discoverable without a centralised order book.

🌐

Multi-Wallet Support

Compatible with the major Bitcoin wallet ecosystem. Connect with your existing wallet. No new account required.

📦

Collection Registry

On-chain collection metadata using parent-child inscription relationships. No centralised catalogue. Discovery is permissionless.

🔗

Direct Offer Sharing

PSBT offers can be shared via QR code, direct message, or private channel. Execution validation is identical regardless of discovery method.

oodinals.com — Active Listings

Inscription #48,291

Pixel Art · Genesis Collection

0.0125 ₿

Trustless PSBT

PSBT Verified Taproot ● Active

Inscription #112,847

Text · Rare Satoshi

0.0380 ₿

Trustless PSBT

PSBT Verified Rare Sat ● Active

Inscription #9,041

Image · Sub-10k OG

0.2100 ₿

Trustless PSBT

PSBT Verified Sub-10k ● Active

Ecosystem Roles

Who Participates

OODL introduces new economic roles across the Bitcoin ecosystem. No single participant captures all value. Incentives are structurally distributed.

📝

Intent Publishers

Express desired outcomes. Set conditions. Publish to Bitcoin. No counterparty required at listing time.

⚡

Executors

Discover published intents. Add funding. Complete the transaction. Permissionless participation.

💼

Wallets

Execution interfaces. Sign PSBTs. Verify offers before broadcast. Make the protocol accessible.

🔍

Indexers

Discovery engines. Scan Bitcoin for OODL listings. Compete on quality. Provide APIs to wallets.

⛏️

Miners

Observe all intents. Execute profitable ones directly. A new revenue stream beyond subsidies.

Security Model

No Trusted Operator

OODL introduces no new trust assumptions. Every security property derives from existing Bitcoin consensus.

✅

Payout Commitment

SIGHASH_SINGLE locks the seller's payout output. No executor can redirect the payment without invalidating the seller's signature.

✅

Pre-Execution Verification

Any wallet can validate PSBT integrity before adding buyer inputs. The offer terms are fully auditable before committing funds.

✅

Mutation Detection

Any modification to the seller's signed portion after signing invalidates the signature. Tampering is caught at broadcast time.

✅

Stale Listing Prevention

A spent UTXO cannot be used in a new transaction. Cancelled listings are automatically invalid by Bitcoin's UTXO model.

✅

Atomic Settlement

Inscription transfer and payment happen in one transaction. Partial execution is structurally impossible. No arbitration ever needed.

✅

No Consensus Changes

Every OODL transaction is valid under current Bitcoin rules. No soft fork. No miner signaling. Deployment requires tooling, not permission.

Documentation

White Paper

01Introduction & Motivation→ 02Core Concept — Executable Intent→ 03Embedded Offer Mechanism→ 04Seller Offer PSBT Structure→ 05Execution Guarantees→ 06OODL Usage Paths→ 07The Bitcoin Intent Layer→ 08Expanded Possibility Space→ 09Security Model→ 10Decentralisation Properties→ 11Investor & Ecosystem Narrative→ 12Protocol Vision Statement→ AProtocol Specification→ BImplementation Roadmap→ CGlossary & Technical Reference→

Protocol White Paper · v1.0

OODL: Beyond Ordinals

The complete OODL protocol specification. Covers the mechanism, security model, 13 use cases with Bitcoin fit assessments, formal protocol spec, implementation roadmap, glossary, and technical reference. Written for builders, investors, miners, and wallet developers.

Author

switch-900

Platform

oodinals.com

Version

1.0 — Full Publication

Sections

19 sections + 3 appendices

Consensus

No changes required

Read White Paper Launch Platform →

Bitcoin was always capable of this.

OODL makes it visible. The agreement is on-chain. Execution is permissionless. The network is the marketplace.

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