silk road block-cypher
# get a couple transactions from a known address (supposedly Silk Road)
$ curl https://api.blockcypher.com/v1/btc/main/addrs/1rundZJCMJhUiWQNFS5uT3BvisBuLxkAp?limit=2
# get one of the two transactions (a big one)
$ curl https://api.blockcypher.com/v1/btc/main/txs/a40c283de4c26b027a5734ff89ce78ade1220fc313befa107ec6c245c24bdec0
# retrieve the block it was included in by height
$ curl https://api.blockcypher.com/v1/btc/main/blocks/319957