> For the complete documentation index, see [llms.txt](https://andrewkimjoseph.gitbook.io/celina-sdk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://andrewkimjoseph.gitbook.io/celina-sdk/services/blockchainservice.md).

# BlockchainService

[**@andrewkimjoseph/celina-sdk**](/celina-sdk/api-reference/api-reference.md)

***

[@andrewkimjoseph/celina-sdk](/celina-sdk/api-reference/api-reference.md) / [services/blockchain.service](https://github.com/andrewkimjoseph/celina-sdk/tree/main/docs/api-reference/services/blockchain.service/README.md) / BlockchainService

## Class: BlockchainService

Defined in: [src/services/blockchain.service.ts:67](https://github.com/andrewkimjoseph/celina-sdk/blob/c35fe1db07a45a3cd14b2185df4abf2e6a2ec609/src/services/blockchain.service.ts#L67)

Celo mainnet block and transaction queries.

### Constructors

#### Constructor

> **new BlockchainService**(`clientFactory`): `BlockchainService`

Defined in: [src/services/blockchain.service.ts:68](https://github.com/andrewkimjoseph/celina-sdk/blob/c35fe1db07a45a3cd14b2185df4abf2e6a2ec609/src/services/blockchain.service.ts#L68)

**Parameters**

**clientFactory**

`CeloClientFactory`

**Returns**

`BlockchainService`

### Methods

#### checkAttributionInTransaction()

> **checkAttributionInTransaction**(`hash`, `tag?`): `Promise`<[`AttributionVerificationResult`](/celina-sdk/types/attributionverificationresult.md) & `object` & `object`>

Defined in: [src/services/blockchain.service.ts:238](https://github.com/andrewkimjoseph/celina-sdk/blob/c35fe1db07a45a3cd14b2185df4abf2e6a2ec609/src/services/blockchain.service.ts#L238)

Decode attribution from a mined transaction with a unified custom `tags` list.

**Parameters**

**hash**

`` `0x${string}` ``

Transaction hash

**tag?**

`string`

Optional tag to check (e.g. `celo_862c21dd97a7`)

**Returns**

`Promise`<[`AttributionVerificationResult`](/celina-sdk/types/attributionverificationresult.md) & `object` & `object`>

***

#### getBlock()

> **getBlock**(`blockId`, `options?`): `Promise`<{ `gasLimit`: `string`; `gasUsed`: `string`; `gasUtilization`: `number`; `hash`: `` `0x${string}` `` | `null`; `miner`: `` `0x${string}` ``; `number`: `string` | `undefined`; `parentHash`: `` `0x${string}` ``; `timestamp`: `string`; `transactionCount`: `number`; `transactions`: (`` `0x${string}` `` | { `blockNumber`: `string` | `undefined`; `from`: `` `0x${string}` ``; `gas`: `string`; `gasPrice`: `string` | `undefined`; `gasPriceGwei`: `number` | `undefined`; `hash`: `` `0x${string}` ``; `input`: `` `0x${string}` ``; `nonce`: `number`; `to`: `` `0x${string}` `` | `null`; `transactionIndex`: `number` | `null` | `undefined`; `type`: `string` | `undefined`; `value`: `string`; `valueCelo`: `number`; })\[] | `undefined`; }>

Defined in: [src/services/blockchain.service.ts:97](https://github.com/andrewkimjoseph/celina-sdk/blob/c35fe1db07a45a3cd14b2185df4abf2e6a2ec609/src/services/blockchain.service.ts#L97)

Fetch a block by number, hash, or tag.

**Parameters**

**blockId**

`string` | `number`

Block number, hash, `latest`, or `pending`

**options?**

**includeTransactions?**

`boolean`

When true, include full transaction objects

**Returns**

`Promise`<{ `gasLimit`: `string`; `gasUsed`: `string`; `gasUtilization`: `number`; `hash`: `` `0x${string}` `` | `null`; `miner`: `` `0x${string}` ``; `number`: `string` | `undefined`; `parentHash`: `` `0x${string}` ``; `timestamp`: `string`; `transactionCount`: `number`; `transactions`: (`` `0x${string}` `` | { `blockNumber`: `string` | `undefined`; `from`: `` `0x${string}` ``; `gas`: `string`; `gasPrice`: `string` | `undefined`; `gasPriceGwei`: `number` | `undefined`; `hash`: `` `0x${string}` ``; `input`: `` `0x${string}` ``; `nonce`: `number`; `to`: `` `0x${string}` `` | `null`; `transactionIndex`: `number` | `null` | `undefined`; `type`: `string` | `undefined`; `value`: `string`; `valueCelo`: `number`; })\[] | `undefined`; }>

Block header fields and optional transaction list

**Throws**

When the block is not found

***

#### getLatestBlocks()

> **getLatestBlocks**(`count?`, `offset?`): `Promise`<`object`\[]>

Defined in: [src/services/blockchain.service.ts:157](https://github.com/andrewkimjoseph/celina-sdk/blob/c35fe1db07a45a3cd14b2185df4abf2e6a2ec609/src/services/blockchain.service.ts#L157)

List recent blocks ending at the chain tip (newest last in the array).

**Parameters**

**count?**

`number` = `5`

Number of blocks to return (1–100, default 5)

**offset?**

`number` = `0`

Skip this many blocks from the tip before collecting

**Returns**

`Promise`<`object`\[]>

Summary fields per block (no full transaction payloads)

***

#### getNetworkStatus()

> **getNetworkStatus**(): `Promise`<{ `blockNumber`: `string`; `chainId`: `number`; `gasPriceWei`: `string`; `network`: `string`; }>

Defined in: [src/services/blockchain.service.ts:74](https://github.com/andrewkimjoseph/celina-sdk/blob/c35fe1db07a45a3cd14b2185df4abf2e6a2ec609/src/services/blockchain.service.ts#L74)

Celo mainnet chain id, latest block number, and current gas price.

**Returns**

`Promise`<{ `blockNumber`: `string`; `chainId`: `number`; `gasPriceWei`: `string`; `network`: `string`; }>

Network metadata including `chainId`, `blockNumber`, and `gasPriceWei`

***

#### getTransaction()

> **getTransaction**(`hash`): `Promise`<{ `blockNumber`: `string` | `undefined`; `from`: `` `0x${string}` ``; `gas`: `string`; `gasPrice`: `string` | `undefined`; `gasPriceGwei`: `number` | `undefined`; `hash`: `` `0x${string}` ``; `input`: `` `0x${string}` ``; `nonce`: `number`; `to`: `` `0x${string}` `` | `null`; `transactionIndex`: `number` | `null` | `undefined`; `type`: `string` | `undefined`; `value`: `string`; `valueCelo`: `number`; } | { `blockNumber`: `string` | `undefined`; `from`: `` `0x${string}` ``; `gas`: `string`; `gasEfficiency`: `number`; `gasPrice`: `string` | `undefined`; `gasPriceGwei`: `number` | `undefined`; `gasUsed`: `string`; `hash`: `` `0x${string}` ``; `input`: `` `0x${string}` ``; `nonce`: `number`; `status?`: `string`; `to`: `` `0x${string}` `` | `null`; `transactionIndex`: `number` | `null` | `undefined`; `type`: `string` | `undefined`; `value`: `string`; `valueCelo`: `number`; }>

Defined in: [src/services/blockchain.service.ts:193](https://github.com/andrewkimjoseph/celina-sdk/blob/c35fe1db07a45a3cd14b2185df4abf2e6a2ec609/src/services/blockchain.service.ts#L193)

Fetch a transaction and its receipt by hash.

**Parameters**

**hash**

`` `0x${string}` ``

Transaction hash

**Returns**

`Promise`<{ `blockNumber`: `string` | `undefined`; `from`: `` `0x${string}` ``; `gas`: `string`; `gasPrice`: `string` | `undefined`; `gasPriceGwei`: `number` | `undefined`; `hash`: `` `0x${string}` ``; `input`: `` `0x${string}` ``; `nonce`: `number`; `to`: `` `0x${string}` `` | `null`; `transactionIndex`: `number` | `null` | `undefined`; `type`: `string` | `undefined`; `value`: `string`; `valueCelo`: `number`; } | { `blockNumber`: `string` | `undefined`; `from`: `` `0x${string}` ``; `gas`: `string`; `gasEfficiency`: `number`; `gasPrice`: `string` | `undefined`; `gasPriceGwei`: `number` | `undefined`; `gasUsed`: `string`; `hash`: `` `0x${string}` ``; `input`: `` `0x${string}` ``; `nonce`: `number`; `status?`: `string`; `to`: `` `0x${string}` `` | `null`; `transactionIndex`: `number` | `null` | `undefined`; `type`: `string` | `undefined`; `value`: `string`; `valueCelo`: `number`; }>

Transaction fields, gas efficiency, and receipt status when mined

**Throws**

When the transaction is not found

***

#### verifyAttributionInTransaction()

> **verifyAttributionInTransaction**(`hash`, `tag?`): `Promise`<[`AttributionVerificationResult`](/celina-sdk/types/attributionverificationresult.md) & `object`>

Defined in: [src/services/blockchain.service.ts:215](https://github.com/andrewkimjoseph/celina-sdk/blob/c35fe1db07a45a3cd14b2185df4abf2e6a2ec609/src/services/blockchain.service.ts#L215)

Decode ERC-8021 attribution tags from a mined transaction's calldata.

**Parameters**

**hash**

`` `0x${string}` ``

Transaction hash

**tag?**

`string`

Optional tag to check (e.g. `celo_862c21dd97a7`)

**Returns**

`Promise`<[`AttributionVerificationResult`](/celina-sdk/types/attributionverificationresult.md) & `object`>


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