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Release Notes for Klaytn v1.2.0

Highlight - The first official release of Service Chain

We are pleased to announce that this version officially supports Service Chain. Service Chain is Klaytn’s layer-2 solution designed to achieve horizontal scalability. Service chains run independently from the Klaytn main chain and can have own governance. To learn more about the Service Chain, please visit https://docs.klaytn.foundation/klaytn/scaling-solutions.

New Features

  • Service Chain features

  • Data anchoring: Service chain data can be anchored to a parent chain via ChainDataAnchoring transaction.

  • Cross-chain value transfer: KLAY and KCT can be transferred between a service chain and a parent chain.

  • High Availability: Multiple bridge nodes can be set up in an H/A configuration to reduce downtime due to accidental hardware/software failure.

  • New APIs for Service Chain

  • klay_getDecodedAnchoringTransactionByHash

  • subbridge_getParentOperatorBalance

  • subbridge_getChildOperatorBalance

  • subbridge_getAnchoringTxHashByBlockNumber

  • subbridge_getValueTransferOperatorThreshold

  • subbridge_setValueTransferOperatorThreshold

  • subbridge_registerOperator

  • subbridge_getRegisteredOperators


  • Fixed a race condition in txpool.


  • Only unlocked tokens can be moved across chains.

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