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Update getBlockTime rpc docs (#7688)

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Tyera Eulberg 2020-01-06 00:00:20 -07:00 committed by GitHub
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book/src/api-reference/jsonrpc-api.md
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@ -213,9 +213,17 @@ curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1, "m
### getBlockTime
Returns the estimated production time of a block. Validators report their UTC
time to the ledger on a regular interval. A block's time is calculated as an
offset from the median value of the most recent validator time report.
Returns the estimated production time of a block.
Each validator reports their UTC time to the ledger on a regular interval by
intermittently adding a timestamp to a Vote for a particular block. A requested
block's time is calculated from the stake-weighted mean of the Vote timestamps
in a set of recent blocks recorded on the ledger.
Nodes that are booting from snapshot or limiting ledger size (by purging old
slots) will return null timestamps for blocks below their lowest root +
`TIMESTAMP_SLOT_RANGE`. Users interested in having this historical data must
query a node that is built from genesis and retains the entire ledger.
#### Parameters: