curl --request POST \
  --url https://api.uniblock.dev/uni/v1/json-rpc?chainId=toncoin-testnet \
  --header 'content-type: application/json' \
  --data '{
    "id": 1,
    "jsonrpc": "2.0",
    "method": "getBlockHeader",
    "params": [
      "finalized"
    ]
  }'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "root": "0xabc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1",
    "canonical": true,
    "header": {
      "message": {
        "slot": "123456",
        "proposer_index": "42",
        "parent_root": "0xparentroot...",
        "state_root": "0xstateroot...",
        "body_root": "0xbodyroot..."
      },
      "signature": "0xsignature..."
    }
  }
}