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protocol/blockchain/transaction-validation/block-level-validation-rules.md
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@@ -13,4 +13,15 @@ blocka --> blocka2(Block A')
blockb --> blockb2(Block B')
```
Since `Block A'` and `Block B'` are at the same block height, there may be some nodes that treat `Block A'` as the most recent block (e.g. `Node A`) and others that treat `Block B'` as the most recent block (e.g. `Node B`). If a transaction is submitted to both `Node A` and `Node B` that spends an output created in a transaction in `Block A`, `Node A` may consider the transaction valid while `Node B` would reject it on the grounds that it is dependent on a UTXO that is not a part of `Block B'`'s history, which only contains `Block B'`, `Block B`, and `Block N` (and its parents).
Since `Block A'` and `Block B'` are at the same block height, there may be some nodes that treat `Block A'` as the most recent block (e.g. `Node A`) and others that treat `Block B'` as the most recent block (e.g. `Node B`). If a transaction is submitted to both `Node A` and `Node B` that spends an output created in a transaction in `Block A`, `Node A` may consider the transaction valid while `Node B` would reject it on the grounds that it is dependent on a UTXO that is not a part of `Block B'`'s history, which only contains `Block B'`, `Block B`, and `Block N` (and its parents).
Other block-level validation rules include:
- Coinbase Transaction Reward Validation
- The coinbase transaction in a block must collect the correct reward for the block height. For more information see [Coinbase Transaction](/protocol/blockchain/block#coinbase-transaction).
- Transaction Chaining Limit
- Many nodes impose a limit of transactions that can be chained together in a single block. That is, if transaction Z spends an output of transaction Y, which spends an input of transaction X, and so on to Transaction A, the transaction may be rejected.
- This limit is often set to 25 chained transactions.
- Coinbase Transaction Block Height
- The coinbase transaction in a block must provide an unlocking script that that starts with a push operation which pushes the block height of the block it is contained in.
- This requirement was added in [BIP-34](/protocol/forks/bip-0034) to ensure that coinbase transactions are unique.