| Version | [Version](#version) | Version defines the application and protocol verion being used. | Must adhere to the validation rules of [Version](#version) |
| ChainID | String | ChainID is the ID of the chain. This must be unique to your chain. | ChainID must be less than 50 bytes. |
| Height | int64 | Height is the height for this header. | Must be > 0, >= initialHeight, and == previous Height+1 |
| Height | uint64 | Height is the height for this header. | Must be > 0, >= initialHeight, and == previous Height+1 |
| Time | [Time](#time) | The timestamp is equal to the weighted median of validators present in the last commit. Read more on time in the [BFT-time section](../consensus/bft-time.md). Note: the timestamp of a vote must be greater by at least one millisecond than that of the block being voted on. | Time must be >= previous header timestamp + consensus parameters TimeIotaMs. The timestamp of the first block must be equal to the genesis time (since there's no votes to compute the median). |
| LastBlockID | [BlockID](#blockid) | BlockID of the previous block. | Must adhere to the validation rules of [blockID](#blockid). The first block has `block.Header.LastBlockID == BlockID{}`. |
| LastCommitHash | slice of bytes (`[]byte`) | MerkleRoot of the lastCommit's signatures. The signatures represent the validators that committed to the last block. The first block has an empty slices of bytes for the hash. | Must be of length 32 |
@ -179,7 +179,7 @@ Commit is a simple wrapper for a list of signatures, with one for each validator
| Height | int64 | Height at which this commit was created. | Must be > 0 |
| Height | uint64 | Height at which this commit was created. | Must be > 0 |
| Round | int32 | Round that the commit corresponds to. | Must be > 0 |
| BlockID | [BlockID](#blockid) | The blockID of the corresponding block. | Must adhere to the validation rules of [BlockID](#blockid). |
| Signatures | Array of [CommitSig](#commitsig) | Array of commit signatures that correspond to current validator set. | Length of signatures must be > 0 and adhere to the validation of each individual [Commitsig](#commitsig) |
@ -221,7 +221,7 @@ The vote includes information about the validator signing it. When stored in the
| Type | [SignedMsgType](#signedmsgtype) | Either prevote or precommit. [SignedMsgType](#signedmsgtype) | A Vote is valid if its corresponding fields are included in the enum [signedMsgType](#signedmsgtype) |
| Height | int64 | Height for which this vote was created for | Must be > 0 |
| Height | uint64 | Height for which this vote was created for | Must be > 0 |
| Round | int32 | Round that the commit corresponds to. | Must be > 0 |
| BlockID | [BlockID](#blockid) | The blockID of the corresponding block. | [BlockID](#blockid) |
| Timestamp | [Time](#Time) | Timestamp represents the time at which a validator signed. | [Time](#time) |
@ -237,7 +237,7 @@ the fields.
```proto
message CanonicalVote {
SignedMsgType type = 1;
sfixed64 height = 2;
fixed64 height = 2;
sfixed64 round = 3;
CanonicalBlockID block_id = 4;
google.protobuf.Timestamp timestamp = 5;
@ -275,7 +275,7 @@ is locked in POLRound. The message is signed by the validator private key.
| Type | [SignedMsgType](#signedmsgtype) | Represents a Proposal [SignedMsgType](#signedmsgtype) | Must be `ProposalType` [signedMsgType](#signedmsgtype) |
| Height | int64 | Height for which this vote was created for | Must be > 0 |
| Height | uint64 | Height for which this vote was created for | Must be > 0 |
| Round | int32 | Round that the commit corresponds to. | Must be > 0 |
| POLRound | int64 | Proof of lock | Must be > 0 |
| BlockID | [BlockID](#blockid) | The blockID of the corresponding block. | [BlockID](#blockid) |