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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0
Trusted Operators
0
Consensus Changes
4
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.

01
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
02
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
03
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
💸
Sponsored Transactions
ANYONECANPAY enables native fee sponsorship. Third parties add inputs to cover fees without altering seller conditions.
Native Bitcoin
🏛️
Decentralised Launchpads
Collection launches without gatekeepers. On-chain mint intents with time windows. Revenue flows directly to creators.
Partial — Indexer Layer
Live Implementation

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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