Add comment about domain type reservation

ethereum · May 13, 2022 · 5ba1812 · 5ba1812
1 parent 207f287
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diff --git a/specs/bellatrix/beacon-chain.md b/specs/bellatrix/beacon-chain.md
@@ -11,7 +11,6 @@
 - [Introduction](#introduction)
 - [Custom types](#custom-types)
 - [Constants](#constants)
-  - [Domain types](#domain-types)
 - [Preset](#preset)
   - [Execution](#execution)
   - [Updated penalty values](#updated-penalty-values)
@@ -66,12 +65,6 @@ Additionally, this upgrade introduces the following minor changes:
 
 ## Constants
 
-### Domain types
-
-| Name | Value |
-| - | - |
-| `DOMAIN_APPLICATION` | `DomainType('0x00000001')` |
-
 ## Preset
 
 ### Execution

diff --git a/specs/phase0/beacon-chain.md b/specs/phase0/beacon-chain.md
@@ -203,6 +203,9 @@ The following values are (non-configurable) constants used throughout the specif
 | `DOMAIN_VOLUNTARY_EXIT`      | `DomainType('0x04000000')` |
 | `DOMAIN_SELECTION_PROOF`     | `DomainType('0x05000000')` |
 | `DOMAIN_AGGREGATE_AND_PROOF` | `DomainType('0x06000000')` |
+| `DOMAIN_APPLICATION_MASK`    | `DomainType('0x00000001')` |
+
+*Note*: `DOMAIN_APPLICATION_MASK` reserves the rest of the bitspace in `DomainType` for application usage. This means for some `DomainType` `DOMAIN_SOME_APPLICATION`, `DOMAIN_SOME_APPLICATION && DOMAIN_APPLICATION_MASK` **MUST** be non-zero. This expression for any other `DomainType` in the consensus specs **MUST** be zero.
 
 ## Preset