Mainnet explorer activates at genesis. This lookup runs against the hand-authored preview chain.
Transaction Found — In Mempool
3cf766b557c48e105b723e03fbc79e265ad7ce9f85991e4e176e557dc0fe57ef is currently in the mempool.
getrawmempoolreturns bare txids only — there is no RPC that returns a mempool transaction's inputs/outputs before it is mined. Once this transaction appears in a block, its full detail will be reachable from that block's page.
No Global Transaction Index
The node's RPC surface has no by-txid lookup, on purpose. This page resolves a transaction only two ways: (1) it is one of the bare txids currently reported by getrawmempool — bodies are never available for those, by design of the RPC, whether live or preview; or (2) it is found by scanning getblockbodies descending from the tip and computing each transaction's SHA-256d id here, from its serialized bytes (the wire format carries no txid field), bounded to a recent window of blocks.