# Block
Blocks contain an array of Transactions that occurred at a particular BlockIdentifier. A hard requirement for blocks returned by Rosetta implementations is that they MUST be _inalterable_: once a client has requested and received a block identified by a specific BlockIndentifier, all future calls for that same BlockIdentifier must return the same block contents.
## Example Usage
```typescript
import { Block } from "icpmcp-rosetta-api";
let value: Block = {
blockIdentifier: {
index: 1123941,
hash: "0x1f2cc6c5027d2f201a5453ad1119574d2aed23a392654742ac3c78783c071f85",
},
parentBlockIdentifier: {
index: 1123941,
hash: "0x1f2cc6c5027d2f201a5453ad1119574d2aed23a392654742ac3c78783c071f85",
},
timestamp: 1582833600000,
transactions: [
{
transactionIdentifier: {
hash:
"0x2f23fd8cca835af21f3ac375bac601f97ead75f2e79143bdf71fe2c4be043e8f",
},
operations: [
{
operationIdentifier: {
index: 5,
networkIndex: 0,
},
relatedOperations: [
{
index: 1,
},
{
index: 2,
},
],
type: "Transfer",
status: "Reverted",
account: {
address: "0x3a065000ab4183c6bf581dc1e55a605455fc6d61",
subAccount: {
address: "0x6b175474e89094c44da98b954eedeac495271d0f",
},
},
amount: {
value: "1238089899992",
currency: {
symbol: "BTC",
decimals: 8,
metadata: {},
},
},
coinChange: {
coinIdentifier: {
identifier:
"0x2f23fd8cca835af21f3ac375bac601f97ead75f2e79143bdf71fe2c4be043e8f:1",
},
coinAction: "coin_spent",
},
metadata: {},
},
],
relatedTransactions: [
{
networkIdentifier: {
blockchain: "bitcoin",
network: "mainnet",
subNetworkIdentifier: {
network: "shard 1",
metadata: {},
},
},
transactionIdentifier: {
hash:
"0x2f23fd8cca835af21f3ac375bac601f97ead75f2e79143bdf71fe2c4be043e8f",
},
direction: "forward",
},
],
metadata: {},
},
],
metadata: {},
};
```
## Fields
| Field | Type | Required | Description | Example |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `blockIdentifier` | [models.BlockIdentifier](../models/blockidentifier.md) | :heavy_check_mark: | The block_identifier uniquely identifies a block in a particular network. | |
| `parentBlockIdentifier` | [models.BlockIdentifier](../models/blockidentifier.md) | :heavy_check_mark: | The block_identifier uniquely identifies a block in a particular network. | |
| `timestamp` | *number* | :heavy_check_mark: | The timestamp of the block in milliseconds since the Unix Epoch. The timestamp is stored in milliseconds because some blockchains produce blocks more often than once a second. | 1582833600000 |
| `transactions` | [models.Transaction](../models/transaction.md)[] | :heavy_check_mark: | N/A | |
| `metadata` | [models.BlockMetadata](../models/blockmetadata.md) | :heavy_minus_sign: | N/A | {<br/>"transactions_root": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",<br/>"difficulty": "123891724987128947"<br/>} |
