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@@ -222,23 +222,38 @@ The canonical blockchain now contains blocks M0 and the current state is:
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This section gives further details about the high level structures that will be
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used by the protocol.
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+Note that for hashes, we define custom types like `TransactionHash`, but here
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+we will just use the raw byte representation `[u8; 32]`.
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+
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+| Index | Type | Description |
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+|---------------|----------------|-----------------------------------------------------|
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+| `block_index` | `u32` | Block height |
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+| `tx_index` | `u16` | Index of a tx within a block |
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+| `call_index` | `u16` | Index of contract call within a single tx |
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+
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+`u32` can store 4.29 billion blocks, which with a 90 second blocktime
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+corresponds to 12.2k years.
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+
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+`u16` max value 65535 which is far above the expected limits. By comparison
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+the tx in Bitcoin with the most outputs has 2501.
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+
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## Header
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-| Field | Type | Description |
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-|-------------|----------------|------------------------------------------------|
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-| `version` | `u8` | Block version |
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-| `previous` | `blake3::Hash` | Previous block hash |
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-| `height` | `u64` | Block height |
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-| `timestamp` | `Timestamp` | Block creation timestamp |
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-| `nonce` | `u64` | The block's nonce value |
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-| `tree` | `MerkleTree` | Merkle tree of the block's transactions hashes |
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+| Field | Type | Description |
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+|-------------|----------------|-----------------------------------------------------|
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+| `version` | `u8` | Block version |
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+| `previous` | `[u8; 32]` | Previous block hash |
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+| `height` | `u32` | Block height |
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+| `timestamp` | `u64` | Block creation timestamp |
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+| `nonce` | `u64` | The block's nonce value |
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+| `tree_root` | `[u8; 32]` | Merkle tree root of the block's transactions hashes |
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## Block
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| Field | Type | Description |
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|-------------|---------------------|--------------------------|
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-| `header` | `blake3::Hash` | Block header hash |
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-| `txs` | `Vec<blake3::Hash>` | Transaction hashes |
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+| `header` | `[u8; 32]` | Block header hash |
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+| `txs` | `Vec<[u8; 32]` | Transaction hashes |
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| `signature` | `Signature` | Block producer signature |
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## Blockchain
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@@ -253,8 +268,8 @@ used by the protocol.
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| Field | Type | Description |
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|-------------|---------------------|----------------------------------|
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| `chain` | `Blockchain` | Forks current blockchain state |
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-| `proposals` | `Vec<blake3::Hash>` | Fork proposal hashes sequence |
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-| `mempool` | `Vec<blake3::Hash>` | Valid pending transaction hashes |
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+| `proposals` | `Vec<[u8; 32]` | Fork proposal hashes sequence |
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+| `mempool` | `Vec<[u8; 32]` | Valid pending transaction hashes |
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## Validator
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zero