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fix: set Eth-Execution-Payload-Blinded header on envelope publish #124

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Merged
pk910 merged 5 commits into from
Jul 2, 2026
Merged

fix: set Eth-Execution-Payload-Blinded header on envelope publish #124

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78905ec
fix: set Eth-Execution-Payload-Blinded header on envelope publish
barnabasbusa Jul 1, 2026
1491ab2
trim comment
barnabasbusa Jul 1, 2026
fc82c5e
fix comment: header is false because body is never blinded (not 'alwa…
barnabasbusa Jul 1, 2026
c279ebc
make payload reveal fully stateless
pk910 Jul 2, 2026
6465d94
Merge branch 'main' into fix/epbs-blinded-header-publish
pk910 Jul 2, 2026
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58 changes: 24 additions & 34 deletions pkg/rpc/beacon/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -48,41 +48,36 @@ func (c *Client) SubmitExecutionPayloadBid(ctx context.Context, bid *eth2all.Sig
}

// signedExecutionPayloadEnvelopeContents is the stateless publish body: the signed
// envelope nested under "signed_execution_payload_envelope" alongside kzg_proofs and blobs
// (mirrors Prysm's SignedExecutionPayloadEnvelopeContents struct).
// envelope nested under "signed_execution_payload_envelope" alongside kzg_proofs and blobs.
// All three fields are required by the beacon-API schema, so kzg_proofs and blobs must be
// present (as empty arrays) even when the payload carries no blobs.
type signedExecutionPayloadEnvelopeContents struct {
SignedExecutionPayloadEnvelope json.RawMessage `json:"signed_execution_payload_envelope"`
KzgProofs []string `json:"kzg_proofs,omitempty"`
Blobs []string `json:"blobs,omitempty"`
KzgProofs []string `json:"kzg_proofs"`
Blobs []string `json:"blobs"`
}

// SubmitExecutionPayloadEnvelope submits a signed execution payload envelope.
// When blobs and kzg proofs are provided they are wrapped in the
// SignedExecutionPayloadEnvelopeContents body so the beacon node can derive
// and broadcast data column sidecars; otherwise the bare signed envelope is sent.
// SubmitExecutionPayloadEnvelope submits a signed execution payload envelope using the
// stateless flow (SignedExecutionPayloadEnvelopeContents body, Eth-Execution-Payload-Blinded
// false). The stateful/blinded flow only works when the beacon node cached the full envelope
// from its own block production (produceBlockV4); buildoor builds payloads externally, so the
// beacon node never has them cached and the stateless form is the only valid one.
func (c *Client) SubmitExecutionPayloadEnvelope(ctx context.Context, envelope json.RawMessage, blobs [][]byte, kzgProofs [][]byte) error {
url := fmt.Sprintf("%s/eth/v1/beacon/execution_payload_envelopes", c.baseURL)

var bodyJSON []byte
var err error

if len(blobs) > 0 {
contents := signedExecutionPayloadEnvelopeContents{
SignedExecutionPayloadEnvelope: envelope,
}
contents.Blobs = make([]string, len(blobs))
for i, b := range blobs {
contents.Blobs[i] = fmt.Sprintf("0x%x", b)
}
contents.KzgProofs = make([]string, len(kzgProofs))
for i, p := range kzgProofs {
contents.KzgProofs[i] = fmt.Sprintf("0x%x", p)
}
bodyJSON, err = json.Marshal(contents)
} else {
bodyJSON = envelope
contents := signedExecutionPayloadEnvelopeContents{
SignedExecutionPayloadEnvelope: envelope,
KzgProofs: make([]string, len(kzgProofs)),
Blobs: make([]string, len(blobs)),
}
for i, b := range blobs {
contents.Blobs[i] = fmt.Sprintf("0x%x", b)
}
for i, p := range kzgProofs {
contents.KzgProofs[i] = fmt.Sprintf("0x%x", p)
}

bodyJSON, err := json.Marshal(contents)
if err != nil {
return fmt.Errorf("failed to marshal publish request: %w", err)
}
Expand All @@ -94,6 +89,9 @@ func (c *Client) SubmitExecutionPayloadEnvelope(ctx context.Context, envelope js

req.Header.Set("Content-Type", "application/json")
req.Header.Set("Eth-Consensus-Version", "gloas")
// Always the stateless form: header "false" selects the Contents body schema. Strict
// CLs (Prysm) reject the request when the header is missing.
req.Header.Set("Eth-Execution-Payload-Blinded", "false")

httpClient := &http.Client{}

Expand All @@ -114,7 +112,6 @@ func (c *Client) SubmitExecutionPayloadEnvelope(ctx context.Context, envelope js

// PayloadEnvelopeInfo contains key fields from a fetched execution payload envelope.
type PayloadEnvelopeInfo struct {
Slot phase0.Slot
BlockRoot phase0.Root
BlockHash phase0.Hash32
BuilderIndex uint64
Expand Down Expand Up @@ -155,7 +152,6 @@ func (c *Client) GetExecutionPayloadEnvelope(
} `json:"payload"`
BuilderIndex string `json:"builder_index"`
BeaconBlockRoot string `json:"beacon_block_root"`
Slot string `json:"slot"`
} `json:"message"`
} `json:"data"`
}
Expand All @@ -166,11 +162,6 @@ func (c *Client) GetExecutionPayloadEnvelope(

msg := &response.Data.Message

slot, err := strconv.ParseUint(msg.Slot, 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid slot: %w", err)
}

blockRoot, err := parseRoot(msg.BeaconBlockRoot)
if err != nil {
return nil, fmt.Errorf("invalid beacon_block_root: %w", err)
Expand All @@ -187,7 +178,6 @@ func (c *Client) GetExecutionPayloadEnvelope(
}

return &PayloadEnvelopeInfo{
Slot: phase0.Slot(slot),
BlockRoot: blockRoot,
BlockHash: blockHash,
BuilderIndex: builderIndex,
Expand Down