Fractal Standard Indexing Service

Fractal Standard Indexing Service is designed to provide Fractal Bitcoin with an open-source, permissionless, standardized indexing service and integrated into the Fractal block reward system.

FIP-101 proposal introduces Fractal Standard indexing service. It details the complete mechanism and implementation path for introducing standardized indexing service on Fractal Bitcoin. Read the full proposal here.

Why Indexing Service Matters

For every three mined blocks, one block will be permissionlessly-mined, one block will be merged-mined, and one block will be produced via indexing service.

From a network architecture perspective:

• Merged Mining provides security

• Permissionless Mining ensures openness and decentralization

• Indexing enables data availability, composability, and application usability

Indexing reliability and availability are infrastructure-level requirements comparable to network security and decentralization, and therefore require long-term economic incentives.

In other words, indexing is not only a developer convenience layer. It is part of the infrastructure that allows the network to remain usable, composable, and scalable as the ecosystem expands.

The Problem It Solves

1. Lack of Standardization in High-Performance Indexing

Currently, multiple indexing solutions exist within the Fractal community, including both commercial and open-source implementations. However:

• Protocol parsing logic and output formats are inconsistent

• Maintenance costs remain high

• No unified standard interface or data structure has emerged

This fragmentation introduces uncertainty and significantly increases integration costs for application developers.

1. The Urgent Need for Standardization

Without timely standardization:

• Protocol interpretation may fragment across different implementations

• Developers will be forced to maintain redundant parsing logic

• Integration errors and ecosystem inconsistency risks will increase

Standardized indexing has become a necessary foundation for Fractal’s sustainable expansion.

Why Now

Over the past two quarters, UniSat Team, as a core contributor to Fractal Bitcoin, has conducted extensive refactoring of its production indexing system, achieving:

• Approximately 80% reduction in memory usage

• Initial synchronization completion within 24 hours, significantly faster than many existing open-source solutions

• Substantially reduced hardware requirements and operational barriers

The maturity of this infrastructure now enables a transition toward a fully open, community-operated standardized indexing framework.

Core Design Principles

1. Open Participation and Replaceability

The Fractal Standard Indexing Service is built around openness and replaceability:

• Indexing software will be open-source

• Participation is permissionless

• Standardized output formats allow applications to switch between different implementations, reducing vendor lock-in risks

2. Non-custodial Staking and Exit Guarantees

• Users stake FB to specific indexing instances to participate in reward distribution

• Staking is implemented using Taproot scripts

• Funds remain under user private-key control at all times

• Users may exit and migrate between indexing services

• No slashing mechanism is introduced in this proposal

3. Non-blocking Block Production and Asynchronous Settlement

Indexing infrastructure may experience downtime, network partitions, or temporary verification issues. Therefore:

• Indexing failures must not affect block production

• Index reward settlement may be delayed

• Long-term reward distribution converges toward target ratios without impacting chain liveness

Settlement must remain outside the block production critical path.

Incentive Structure

The Fractal Standard Indexing Service introduces a reward distribution adjustment from 1:2 (Merged Mining : Permissionless Mining) to 1:1:1 (Merged Mining : Permissionless Mining : Indexing).

Activated distribution:

• Merged Mining: 1

• Permissionless Mining: 1

• Indexing: 1

Total issuance and emission schedule remain unchanged.

The rationale is straightforward: security, openness, and data availability collectively define Fractal’s long-term sustainability.

Participation Roles

The system includes two primary roles:

• Index Operators: Any entity (individuals, teams, miners, pools, institutions) may operate indexing instances and charge service fees

• Stakers: Any user may stake FB into indexing services to participate in reward distribution

This structure is intended to lower operational barriers, encourage decentralized participation, and support sustainable indexing infrastructure at scale.

Reliability and Verification

The system must define:

• Objective criteria for valid indexing results

• Automatic reward suspension for invalid or offline instances

• Reorg handling and rollback consistency

• Proof formats, dispute resolution processes, and verification cycles

Chain must remain operational even during large-scale index downtime.

Rewards pause automatically when indexing instances fail. Recovery mechanisms allow catch-up settlement and long-term convergence.

These rules are designed to make the indexing layer verifiable, fault-tolerant, and operationally sustainable.

Fractal Standard Indexing Service Goals:

• Reduce indexing fragmentation through unified base standards

• Establish sustainable incentives for long-term indexing operation

• Lower operational barriers to encourage decentralized participation

• Minimize trust assumptions via non-custodial staking

The Fractal Standard Indexing Service is intended to reduce indexing fragmentation through unified base standards, establish sustainable incentives for long-term indexing operation, lower operational barriers to encourage decentralized participation, and minimize trust assumptions via non-custodial staking. Standard indexing has become a necessary foundation for Fractal’s sustainable expansion.