Why CAIP Standards Matter
Cross-chain identity breaks down when every network and wallet speaks a different dialect. Users move between chains, apps, and wallets, yet most systems still treat an address as a chain-specific string with no universal context. The result is fragmentation: brittle integrations, inconsistent sessions, and “identity” that resets as soon as a user switches environments.
CAIP standards solve a practical problem: naming. When chains and accounts have consistent, parseable identifiers, applications can recognize users across environments without inventing custom formats for every network. CAIP-2 standardizes chain identifiers, and CAIP-10 standardizes account identifiers by binding a chain context to an address.
This matters for wallet integration, authentication, and session continuity. A canonical identifier lets you store one user key, route requests to the right chain, and render consistent UX across EVM and non-EVM ecosystems—without forcing a user to maintain separate “profiles” per chain.
CAIP-2 and CAIP-10 identify chains and accounts. Real-world identity, explicit account linkage and privacy controls remain application responsibilities.
If you’re a builder, CAIP reduces integration debt and makes multi-chain support less error-prone. If you’re an investor or institution, it’s a sign the platform can explain and audit its identity model across networks. And if you’re a user, it means your wallet and session can be treated consistently without handing over personal data.
CAIP-2 Chain Identifiers
CAIP-2 defines a namespace and reference for identifying a chain consistently across applications.
Examples include eip155:1 for Ethereum and eip155:137 for Polygon. Solana mainnet uses solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp. Each namespace defines its reference rules.
Namespace specification defines the blockchain protocol or system that a chain belongs to. Namespaces might include "eip155" for Ethereum-based chains, "solana" for Solana networks, or other protocol identifiers. This namespace enables applications to understand which blockchain architecture a chain uses, enabling appropriate protocol-specific handling.
Reference specification defines the specific chain identifier within the namespace. For EVM chains, this might be the chain ID number. For Solana, this might be a cluster identifier. The reference enables applications to distinguish between different chains within the same protocol, ensuring that chain-specific logic is applied correctly.
CAIP-2 defines a namespace-and-reference format for identifying a blockchain. Applications still need to validate the identifier and interpret its namespace-specific reference.
In practice, CAIP-2 lets a platform treat “which chain is this?” as a solved problem. Standardized identifiers reduce ambiguity, prevent accidental chain mismatches, and make it easier to support multiple networks without custom mapping logic scattered across the stack.
CAIP-10 Account Identifiers
CAIP-10 combines a chain identifier and account address so an application can retain both account and chain context.
A CAIP-10 identifier looks like namespace:reference:address. For an EVM account, that might be eip155:1:0xABC…. For a Solana account, it might be solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp:9xQeWv…. The chain context is part of the identifier, so the same address string can’t be misinterpreted on the wrong network.
CAIP-10 combines a CAIP-2 chain identifier with an account address. Applications need namespace-aware validation and any applicable normalization rules.
CAIP-10 carries an address within its chain context. Follow the relevant namespace’s syntax and canonicalization guidance when storing or matching identifiers.
Universal recognition enables applications to parse and understand account identifiers regardless of which chain they represent. Applications can extract chain identifiers and account addresses from CAIP-10 identifiers, enabling chain-agnostic account handling. This universal recognition enables applications to work with accounts from multiple chains using consistent logic.
The practical benefit is consistency: applications can store a single canonical account ID, route chain-specific actions correctly, and avoid collisions across networks. This also improves auditing, because logs and events can reference an unambiguous account identifier.
Wallet Integration With CAIP
CAIP identifiers can be used in wallet interfaces that support the relevant chains. Connection methods and signature handling require appropriate integration code.
Standardized connection protocols enable wallets to connect to applications using consistent interfaces regardless of chain. CAIP-defined interfaces specify how applications request wallet connections, how wallets respond, and how account information is exchanged. This standardization enables wallets to work with applications across chains using consistent protocols.
EVM wallet integration uses CAIP-10 account identifiers for Ethereum and other EVM chains. Wallets like MetaMask, WalletConnect, and others can provide CAIP-10 formatted account identifiers, enabling applications to recognize accounts consistently. This integration enables EVM wallets to work seamlessly with applications that support multiple chains.
Solana wallet integration uses CAIP-10 account identifiers for Solana accounts. Wallets like Phantom, Solflare, and others can provide CAIP-10 formatted identifiers, enabling applications to recognize Solana accounts consistently. This integration enables Solana wallets to work with applications that support multiple blockchain networks.
Standardized identifiers also simplify wallet UX. When a wallet presents accounts in CAIP form, applications can support EVM and Solana connections with a consistent internal model while still respecting native address formats and chain-specific signing flows.
Chain-Agnostic Authentication
An application can use CAIP account identifiers alongside a chain-appropriate proof of control. Session creation, authorization and linkage require explicit application policy.
Concretely, a platform can store a session key like eip155:1:0xABC… and use that as the canonical user identifier. If the user later connects a Solana wallet, the platform can treat solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp:9xQeWv… as another CAIP-keyed account—linked only when the user explicitly opts in.
User identification uses CAIP-10 account identifiers to represent users consistently across chains. When users authenticate, applications can recognize their CAIP-10 identifiers regardless of which chain they use, enabling consistent user identification. This identification enables applications to maintain user sessions and preferences across chain interactions.
A session can reference a CAIP account identifier. Define its scope, lifetime, verification and revocation independently of the identifier format.
Cross-chain session continuity enables users to maintain sessions across different chains. When users switch between chains or interact with applications that support multiple chains, their sessions remain valid. This continuity creates seamless experiences where users can move between chains without losing session state.
The Security-By-Design goal is predictable identity handling: consistent identifiers for sessions and auditing, explicit linkage when needed, and fewer edge cases where a chain switch unexpectedly breaks access or changes a user’s perceived identity.
Cross-Chain Identity Portability
Standard account identifiers help applications organize supported chain accounts. Any relationship between accounts needs explicit evidence and an appropriate disclosure policy.
Unified identity representation uses CAIP-10 identifiers to represent users consistently across chains. Applications can recognize users by their CAIP-10 identifiers regardless of which chain they interact with, enabling unified identity management. This representation enables applications to maintain user profiles, preferences, and data across chain interactions.
Identity aggregation enables applications to recognize that multiple CAIP-10 identifiers belong to the same user. Users might have accounts on multiple chains, and identity systems can aggregate these accounts into unified user profiles. This aggregation enables applications to provide unified experiences while recognizing user activity across chains.
An application can associate authorized profile records with account identifiers. Synchronization, permissions and consistency require application controls separate from CAIP syntax.
CAIP-2 and CAIP-10 provide consistent chain and account identifiers. Authentication, explicit linkage, authorization and session security require additional application controls.
This is how we Become Alpha.