Glossary OS

Plain meaning

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A WebSocket subscription method that streams transaction log messages in real time as transactions are processed by the cluster, filterable by 'all' (every transaction), 'allWithVotes' (including vote transactions), or a specific program public key. It is the lowest-latency way for bots and monitoring systems to react to on-chain events emitted via Solana's msg! macro or Anchor's emit! macro without running a full validator or Geyser plugin.

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Technical context

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RPCs, validators, snapshots, indexing, and network plumbing.

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logsSubscribe (logs-subscribe)
Category: Infrastructure
Definition: A WebSocket subscription method that streams transaction log messages in real time as transactions are processed by the cluster, filterable by 'all' (every transaction), 'allWithVotes' (including vote transactions), or a specific program public key. It is the lowest-latency way for bots and monitoring systems to react to on-chain events emitted via Solana's msg! macro or Anchor's emit! macro without running a full validator or Geyser plugin.
Related: WebSocket Subscriptions, Program Log (msg! / sol_log)

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Concept graph

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Branch

WebSocket Subscriptions

A persistent bidirectional connection to a Solana RPC node's WebSocket endpoint (typically on port 8900) that allows clients to receive real-time push notifications when on-chain state changes, rather than polling via HTTP. The subscription model supports account changes, program account changes, slot updates, root changes, signature confirmations, and log emission, each returning a subscription ID used to later unsubscribe.

RPC (Remote Procedure Call)accountSubscribe

Open term

Branch

Program Log (msg! / sol_log)

Diagnostic output from programs using `msg!()` (Anchor) or `sol_log()` (native). Logs appear in transaction metadata and explorer UIs. Each log call costs compute units (~100 CU base + data length). Logs are limited to 10KB per transaction. Anchor events also emit as base64-encoded log messages.

Compute Units (CU)Program

Open term

Next concepts to explore

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Infrastructure

WebSocket Subscriptions

A persistent bidirectional connection to a Solana RPC node's WebSocket endpoint (typically on port 8900) that allows clients to receive real-time push notifications when on-chain state changes, rather than polling via HTTP. The subscription model supports account changes, program account changes, slot updates, root changes, signature confirmations, and log emission, each returning a subscription ID used to later unsubscribe.

Open term

Programming Model

Program Log (msg! / sol_log)

Diagnostic output from programs using `msg!()` (Anchor) or `sol_log()` (native). Logs appear in transaction metadata and explorer UIs. Each log call costs compute units (~100 CU base + data length). Logs are limited to 10KB per transaction. Anchor events also emit as base64-encoded log messages.

Open term

Infrastructure

Mobile Wallet Adapter (MWA)

An open protocol and SDK that defines a local communication channel (via Android intents and a localhost WebSocket) between mobile dApps and Solana wallet apps installed on the same device, allowing dApps to request transaction signing and message signing without exposing private keys. MWA v2 supports authorization scoping, chain-agnostic signing, and session caching, and is the standard integration layer used by Phantom, Solflare, and other mobile Solana wallets.

Open term

Infrastructure

LaserStream

A Helius proprietary ultra-low-latency streaming product built on Geyser plugin infrastructure that delivers real-time transaction and account update notifications directly from validator nodes to subscribers, targeting sub-10ms delivery latency from transaction processing to client receipt. LaserStream is positioned for latency-critical applications such as liquidation bots, arbitrage systems, and real-time portfolio trackers that need faster and more reliable data delivery than standard WebSocket subscriptions.

Open term

Commonly confused with

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Infrastructurelaserstream

LaserStream

A Helius proprietary ultra-low-latency streaming product built on Geyser plugin infrastructure that delivers real-time transaction and account update notifications directly from validator nodes to subscribers, targeting sub-10ms delivery latency from transaction processing to client receipt. LaserStream is positioned for latency-critical applications such as liquidation bots, arbitrage systems, and real-time portfolio trackers that need faster and more reliable data delivery than standard WebSocket subscriptions.

Open term

Related terms

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Infrastructurewebsocket

WebSocket Subscriptions

A persistent bidirectional connection to a Solana RPC node's WebSocket endpoint (typically on port 8900) that allows clients to receive real-time push notifications when on-chain state changes, rather than polling via HTTP. The subscription model supports account changes, program account changes, slot updates, root changes, signature confirmations, and log emission, each returning a subscription ID used to later unsubscribe.

Open term

Programming Modellog

Program Log (msg! / sol_log)

Diagnostic output from programs using `msg!()` (Anchor) or `sol_log()` (native). Logs appear in transaction metadata and explorer UIs. Each log call costs compute units (~100 CU base + data length). Logs are limited to 10KB per transaction. Anchor events also emit as base64-encoded log messages.

Open term

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Infrastructure

RPC (Remote Procedure Call)

The JSON-RPC 2.0 protocol interface through which clients communicate with Solana nodes to query chain state, submit transactions, and subscribe to events. Solana exposes a rich set of HTTP and WebSocket endpoints (e.g., getAccountInfo, sendTransaction) that abstract direct peer-to-peer network participation, making RPC the primary integration point for wallets, dApps, and indexers.

Open term

Infrastructure

RPC Node

A Solana full node that stores ledger state and serves JSON-RPC and WebSocket requests from clients without participating in consensus or voting. RPC nodes must replay every transaction to maintain an accurate account state database, and high-throughput deployments typically run dedicated RPC nodes with large SSDs, high RAM (256 GB+), and high-bandwidth network connections to handle concurrent client load without impacting validator performance.

Open term

Infrastructure

RPC Methods

The enumerated JSON-RPC endpoints exposed by Solana nodes, covering account queries (getAccountInfo, getMultipleAccounts, getProgramAccounts), block and transaction retrieval (getBlock, getTransaction), cluster metadata (getEpochInfo, getSlot, getVersion), and transaction submission (sendTransaction, simulateTransaction). Methods accept a Commitment parameter (processed, confirmed, finalized) to control the recency-vs-safety tradeoff of returned data.

Open term

Infrastructure

getAccountInfo

An RPC method that returns the complete on-chain state of a single account identified by its base-58 public key, including its lamport balance, owner program, executable flag, rent epoch, and raw data payload encoded as base64 or base58. It is the most fundamental read primitive in Solana development and is called at the specified commitment level, with the data field being null if the account does not exist.

Open term