> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cowboy.inc/llms.txt
> Use this file to discover all available pages before exploring further.

# E1751 — CIP-34: sealed bidder is not a registered solver

> CIP-34: sealed bidder is not a registered solver

# E1751 — CIP-34: sealed bidder is not a registered solver

| Property | Value |
| - | - |
| **Code** | `1751` |
| **Slug** | `E1751` |
| **Category** | `runner` (Runner / Consensus) |
| **CIP** | CIP-34 §Sealed-Bid |

## What happened

Cip34: sealed bidder is not a registered solver.

This is the receipt's `what` text, produced by the node's `ExecutionError::SolverNotRegistered`.

## Why it happened

The node rejected the operation with `E1751` (category `runner`, Runner / Consensus). The receipt's `why` field carries the specific cause and `context` carries structured details, when the emitter attaches any.

The normative rule is in CIP-34 §Sealed-Bid.

## How to fix

Register as a CIP-2 runner before submitting a sealed bid — sealed-bid solvers must be CIP-2-registered so griefing is slashable.

## Receipt example

```json theme={null}
{
  "code": 1751,
  "slug": "E1751",
  "category": "runner",
  "what": "cip34: sealed bidder is not a registered solver",
  "fix": "Register as a CIP-2 runner before submitting a sealed bid — sealed-bid solvers must be CIP-2-registered so griefing is slashable.",
  "docs_url": "https://docs.cowboy.inc/errors/E1751"
}
```

***

> [card] [All Error Codes](https://docs.cowboy.inc/errors/overview.md)
>
> View the complete error code reference


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