Searchers

Searchers are independent actors who compete for execution opportunities by submitting transactions that express economic intent.

In Shiroi, searchers participate in deterministic, BBM-resolved auctions. Auction resolution is performed by the Block Builder Module (BBM) operating directly in the validator execution path, eliminating execution distance between bidding and inclusion.

Searchers do not interact with external builders, probabilistic relays, or opaque ordering infrastructure.

BBM-Resolved Auctions

Auctions in Shiroi are resolved by the BBM at the point where ordering decisions directly determine execution outcomes.

This design ensures that:

  • auction resolution is deterministic

  • ordering decisions are immediately enforceable

  • execution success is not probabilistic

  • inclusion is not delegated to external infrastructure

By colocating auction resolution with execution, Shiroi removes the gap between bid evaluation and transaction execution.

Execution Proximity

Execution proximity defines how closely auction resolution is coupled to execution.

In distant builder architectures, auctions are resolved far from execution, forcing searchers to reason in terms of expected value under uncertainty.

Shiroi resolves auctions in the execution-critical path, minimizing uncertainty around:

  • transaction inclusion

  • ordering guarantees

  • state dependencies

  • execution success

This restores price discovery based on actual willingness to pay rather than probabilistic EV optimization.

Deterministic Resolution

Searchers compete using standard Solana transactions.

Auction outcomes are determined by:

  • explicit tips

  • write-account contention

  • deterministic ordering rules enforced by the BBM

There are no discretionary decisions, off-chain preferences, or hidden reordering.

Given the same inputs, auction resolution is reproducible and verifiable.

No EV-Dominated Bidding

When auction resolution is distant from execution, searchers are forced into EV-based strategies:

  • overbidding with low success probability

  • preference for simple transactions

  • avoidance of complex or state-dependent strategies

Shiroi removes this dynamic by aligning auction resolution with execution reality.

Searchers compete on price and intent, not on execution guesses.

Participation Model

Searchers interact with Shiroi using standard transaction submission paths.

There are:

  • no custom RPCs

  • no privileged APIs

  • no private order flow agreements

Participation is expressed through:

  • explicit tips

  • contention over write accounts

  • epoch-based behavior signals

Any searcher can participate without coordination or trust assumptions.

Fairness and Neutrality

Shiroi does not:

  • whitelist searchers

  • prioritize specific strategies

  • leak bundle contents

  • sell ordering guarantees

All transactions are evaluated under the same BBM-enforced rules.

Market outcomes emerge from open competition rather than infrastructure advantage.

Designed for Advanced Searchers

Shiroi provides low-latency transaction delivery and low-latency execution data directly aligned with the validator execution path.

Searchers have access to:

  • optimized, low-latency transaction submission paths

  • early, execution-adjacent data streams

  • deterministic feedback tightly coupled to ordering and inclusion

By minimizing both delivery latency and data latency, Shiroi reduces execution uncertainty and enables searcher strategies that are infeasible in EV-dominated builder models.

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