getbestblockhash - Validation Cloud

Returns the hash of the best (tip) block in the most-work fully-validated chain. This method will use 10 Compute Units.

Reference: Here

Returns

Name	Type	Description
hex	string	the block hash, hex-encoded

curl https://mainnet.bitcoin.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
 -X POST \
 -H "Content-Type: application/json" \
 -d '{
	"jsonrpc": "1.0",
	"id": "curltest",
	"method": "getbestblockhash",
	"params": []
}'

curl https://testnet.bitcoin.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
 -X POST \
 -H "Content-Type: application/json" \
 -d '{
	"jsonrpc": "1.0",
	"id": "curltest",
	"method": "getbestblockhash",
	"params": []
}'