getSignatureStatuses

curl --request POST \
  --url 'https://mainnet.helius-rpc.com/?api-key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "getSignatureStatuses",
  "params": [
    [
      "5VERv8NMvzbJMEkV8xnrLkEaWRtSz9CosKDYjCJjBRnbJLgp8uirBgmQpjKhoR4tjF3ZpRzrFmBV6UjKdiSZkQUW"
    ],
    {
      "searchTransactionHistory": true
    }
  ]
}
'

{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    "context": {
      "slot": 82
    },
    "value": [
      {
        "slot": 48,
        "confirmations": 48,
        "err": null,
        "confirmationStatus": "finalized"
      },
      null
    ]
  }
}