The verifychain RPC verifies each entry in the local block chain database.
verifychain ( checklevel nblocks )
*bitcoin-cli help verifychain
verifychain ( checklevel nblocks ) Verifies blockchain database. Arguments: 1. checklevel (numeric, optional, 0-4, default=3) How thorough the block verification is. 2. nblocks (numeric, optional, default=6, 0=all) The number of blocks to check. Result: true|false (boolean) Verified or not Examples: > bitcoin-cli verifychain > curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "verifychain", "params": [] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/