getLatestBlockhash

Returns the latest blockhash and the last block height at which it is valid.

Returns the latest blockhash and the block height after which the blockhash expires. You must include a valid blockhash in every transaction before signing and submitting it.

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getLatestBlockhash",
  "params": [{ "commitment": "finalized" }]
}

Parameters

commitment · string

Commitment level for the query. One of processed, confirmed, or finalized. Defaults to finalized.

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "context": { "slot": 2792 },
    "value": {
      "blockhash": "EkSnNWid2cvwEVnVx9aBqawnmiCNiDgp3gUdkDPTKN1N",
      "lastValidBlockHeight": 3090
    }
  }
}

value.blockhash · string

The latest blockhash as a base-58 encoded string. Include this in the recentBlockhash field of your transaction.

value.lastValidBlockHeight · number

The last block height at which the blockhash is still valid. Transactions using this blockhash will be rejected after this height.

Example

cURL

curl "https://rpc.solami.fast/sol?api_key=YOUR_API_KEY" \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getLatestBlockhash",
    "params": [{ "commitment": "finalized" }]
  }'