Updates README

Author: Ruteri

README.md

@@ -102,8 +102,8 @@ This repository contains a sample [measurements.json](./measurements.json) file
 Attestation verification requires the expected measurements which you pass through the `--{client, server}-measurements` flag.  
 The measurements are expected to be a JSON map, and multiple valid measurements can be provided. The verifier will attempt to verify with each of the provided measurements, and if any succeeds, the attestation is assumed valid.  
 
-The (single) validated measurement is forwarded (returned in the case of client) as "X-Flashbots-Cert-Extensions-<validator extension OID>".  
-To only validate and forward the measurement, simply provide an empty expected measurements object.  
+The (single) validated measurement is json-marshalled and forwarded (returned in the case of client) as "X-Flashbots-Measurement" header, and the type of attestation (validator OID) as "X-Flashbots-Ext-OID" header. For mapping OIDs to issuers, see [internal/attestation/variant/variant.go](./internal/attestation/variant/variant.go).  
+To only validate and forward the measurement (as opposed to also authorizing the measurement against an expected one), simply provide an empty expected measurements object.  
 
 ---
 

proxy/proxy.go

@@ -23,7 +23,7 @@ type Proxy struct {
 
 const (
 	AttestationTypeHeader string = "X-Flashbots-Ext-OID"
-	MeasurementHeader     string = "X-Flashbots-Measurements"
+	MeasurementHeader     string = "X-Flashbots-Measurement"
 )
 
 func NewProxy(targetURL string, validators []atls.Validator) *Proxy {