Excellent question. I’m asking the team for a reliable way.
I’m at block height 1543482 along with our new block explorer. Not all nodes according to getpeerinfo appear to be there yet. It may just not update frequently. See what the following gives you, by running in debug window or with daemon.
getblock 666335bbae6660022c398bab9b52009ad1e7090ad41ba5da62bd5e8f1f4d17bc
It returns this for me:
{
"hash" : "666335bbae6660022c398bab9b52009ad1e7090ad41ba5da62bd5e8f1f4d17bc",
"size" : 638,
"height" : 1543482,
"version" : 1,
"merkleroot" : "ce67cbce440619dc28b5ebbd373f4bd46a628734ba1ee2b25a967fee6912e062",
"time" : "2017-08-25 12:08:12 UTC",
"nonce" : 0,
"bits" : "1e20e463",
"difficulty" : 0.00011876,
"mint" : 40.0,
"previousblockhash" : "b982cccbbb72b1729aa9185e2e4b2c9984c6f76ad0f4e2d317477af590bf1285",
"flags" : "proof-of-stake",
"proofhash" : "000003f46cbd42f0c1d4bfe1d259a59248ff88b559c2fd2fe3a181e1d7f57360",
"entropybit" : 0,
"modifier" : "7efcc87f35280119",
"modifierchecksum" : "2c20737d",
"tx" : [
"d66adf50b16cbe129b2f8d41b734c267f24215dd36759ddde5d860590bd756fd",
"24ce8f83ec67708715fb047f4f1c9b33cc725dd49bf83e70f63fc3c9a076c3fc"
],
"coinagedestroyed" : 197216,
"vote" : {
[…]
I’m not sure whether you can have received that block and be able to view it without being on that chain, however.