AVS Developer Testnet Migration Guide

Building an Actively Validated Service (AVS) on EigenLayer means developing against a rapidly evolving protocol core. The AVS Developer Testnet Migration Guide addresses the unique operational challenge of maintaining a functional testnet service while the underlying DelegationManager, AllocationManager, and slashing contracts undergo breaking changes. This page is the primary reference for AVS developers who must migrate state, re-register with new middleware interfaces, and simulate slashing scenarios against upgraded core contracts on testnets like Holesky before mainnet activation.

The core tension for AVS teams is that testnet upgrades are not just about node software updates; they require coordinated on-chain contract migrations. When a milestone like M2 activates slashing, an AVS's ServiceManagerBase implementation and off-chain task-submission logic may become incompatible. This guide details strategies for testing new operator set registrations, validating that slashing conditions execute correctly against the Slasher contract, and migrating any persistent AVS state between testnet versions. It directly addresses the pain points of building a service on a protocol where the security substrate itself is in flux.

For AVS developers, the operational risk is service downtime or, worse, a false sense of security if slashing conditions are not properly validated against the latest core contracts. Chainscore Labs provides upgrade readiness reviews for AVS teams, auditing the migration path for middleware contracts and verifying that off-chain node logic correctly interprets new on-chain events. Teams managing complex AVS deployments should treat each testnet upgrade as a full dress rehearsal for mainnet, and this guide provides the technical checklist to execute it.

An EigenLayer testnet upgrade is not a simple redeployment. For an AVS team, the migration surface includes every on-chain middleware contract, every off-chain node service, and every integration point that assumes a specific core protocol state. When the DelegationManager is re-architected or the AllocationManager introduces operator sets on Holesky, an AVS's ServiceManagerBase implementation, its operator registration logic, and its slashing conditions must all be re-validated against the new interfaces. The testnet migration surface is the complete inventory of components that can break during an upgrade.

This surface typically spans three domains. First, on-chain contracts: the AVS's service manager, any custom slashing logic, and reward distribution contracts that interact with core protocol strategies. Second, off-chain services: the operator client software that signs tasks, aggregates BLS signatures, and submits responses on-chain, which must be compatible with new event schemas and API endpoints. Third, state and configuration: operator set registrations, stake allocations, and any upgrade-specific parameters like unbonding periods or quorum thresholds that must be reset or migrated on the new testnet deployment. Teams that treat the migration as a simple contract redeployment often miss breaking changes in event indexing, signature aggregation, or the timing assumptions of withdrawal queues.

The operational risk is highest when multiple core contracts change simultaneously, as seen in the M2-to-M3 transition path. An AVS team must simulate slashing scenarios against the upgraded Slasher contract, confirm that forced inclusion mechanisms do not break task-submission liveness, and ensure that any off-chain monitoring can detect the new slashing events. Chainscore Labs provides structured migration readiness reviews that map an AVS's full dependency tree against the specific core contract changes in each testnet upgrade, identifying integration gaps before they become testnet outages.