52 lines
1.7 KiB
Markdown
52 lines
1.7 KiB
Markdown
# Block
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A Block instance represents the information on a block in the bitcoin network.
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Note that creating it takes some computing power, as the tree of transactions
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is created or verified.
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Given a hexa or base64 string representation of the serialization of a block
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with its transactions, you can instantiate a Block instance. It will calculate
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and check the merkle root hash (if enough data is provided), but transactions
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won't neccesarily be valid spends, and this class won't validate them. A binary
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representation as a `Buffer` instance is also valid input for a Block's
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constructor.
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```javascript
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assert(Block.isValidHeader(data);
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assert(Block.isValidBlock(data);
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var block = new Block(hexaEncodedBlock);
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assert(block.id && block.hash && block.id === block.hash);
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assert(block.version === Block.CurrentVersion);
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assert(block.prevHash);
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assert(block.timestamp);
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assert(block.nonce);
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assert(block.size);
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assert(block.transactions[0] instanceof Transaction);
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```
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## Navigating through transactions
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The set of transactions in a block can be explored by iterating on the block's
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`transactions` member.
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```javascript
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for (var transaction in block.transactions) {
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// ...
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}
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```
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It is also possible to explore a block's Merkle tree of transaction hashes.
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Head to the [Merkle tree](./DataStructures.html#MerkleTree) documentation for
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more information:
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```javascript
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var root = block.tree.root;
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assert(root instanceof bitcore.DataStructures.MerkleTree.Node);
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assert(root.hash === block.id);
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assert(root.isLeaf === false);
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assert(root.left instanceof bitcore.DataStructures.MerkleTree.Node);
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assert(root.right instanceof bitcore.DataStructures.MerkleTree.Node);
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assert(root.left.left.left.left.content === block.transactions[0]);
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```
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