---
title: "ConnectionOpenConfirm defines a rpc handler method for
MsgConnectionOpenConfirm."
method: POST
path: "/ibc.core.connection.v1.Msg/ConnectionOpenConfirm"
tags: ["Msg"]
---

# ConnectionOpenConfirm defines a rpc handler method for
MsgConnectionOpenConfirm.

`POST /ibc.core.connection.v1.Msg/ConnectionOpenConfirm`

## Request body

- IbcCoreConnectionV1MsgConnectionOpenConfirm — MsgConnectionOpenConfirm defines a msg sent by a Relayer to Chain B to acknowledge the change of connection state to OPEN on Chain A.
  - `connection_id` string
  - `proof_ack` string, byte
  - `proof_height` IbcCoreClientV1Height — Normally the RevisionHeight is incremented at each height while keeping RevisionNumber the same. However some consensus algorithms may choose to reset the height in certain conditions e.g. hard forks, state-machine breaking changes In these cases, the RevisionNumber is incremented so that height continues to be monitonically increasing even as the RevisionHeight gets reset
    - `revision_height` string, uint64
    - `revision_number` string, uint64
  - `signer` string

## Response `200`

A successful response.

- IbcCoreConnectionV1MsgConnectionOpenConfirmResponse — MsgConnectionOpenConfirmResponse defines the Msg/ConnectionOpenConfirm response type.

## Other responses

- `default` — An unexpected error response.

## Changes

- **2024-08-14** `21c607e4fa20` — 1 info
  - api operation id `IbcCoreConnectionV1Msg_ConnectionOpenConfirm` removed and replaced with `FeeMsg_ConnectionOpenConfirm`
- **2024-02-23** `54713b4a9d25` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/pokt-network/apis/http-api-console/changes/ibc.core.connection.v1.Msg/ConnectionOpenConfirm/post.md)

---

[API](https://skmtc.dev/pokt-network/apis/http-api-console.md) · [All operations](https://skmtc.dev/pokt-network/apis/http-api-console/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/pokt-network/http-api-console/revisions/21c607e4fa20/schema)