It si very easy thanks to our new insight api.
Simply call:
http://explorer.karmacoin.me/api/block/250422ab30233222e31bda3774f388a7972fd4f3aa59b75cf9fa3919bc740c02 , where
250422ab30233222e31bda3774f388a7972fd4f3aa59b75cf9fa3919bc740c02 is hash of latest block/or first block, depending on direction you need. It returns JSON like:
{"hash":"250422ab30233222e31bda3774f388a7972fd4f3aa59b75cf9fa3919bc740c02","confirmations":2,"size":1030,"height":300382,"version":2,"merkleroot":"740f4771da6823bf0aabb1193e5b3debbf5bbb5927238721b9e71e642fed8ecf","tx":["5ea8683cf3f216f55e93e8990f0fc6bde48bc8f00338f69f5c499dca10db1644","3e4e2533ba6985c64a056fc98d2bf7b8b1d3277662040706ae749fef85983354","dd307a531fb0b248549b2cf3ab172ba76a0672291ce6d62680a07fb2dfa8c479","722ee13ce64b9b2ce789597b181978cd6f63c0eabec74a9d527b70d0158b9a74"],"time":1409601200,"nonce":13440165,"bits":"1c0bee83","difficulty":21.45514767,"previousblockhash":"660c6c71dc5dd7b1f9ba418952d3d0a3fd716375877eed00b61d10c1804d41a2","nextblockhash":"c52cc743f0031ad1817d354d0a07aac598fef384c8464c30322f8a4c53f638e3","reward":20000,"isMainChain":true}
"previousblockhash" and "nextblockhash": are previous/next block you need to call and "tx" is array of all transaction at that block.
Than you can call for every transaction something like this
http://explorer.karmacoin.me/api/tx/5ea8683cf3f216f55e93e8990f0fc6bde48bc8f00338f69f5c499dca10db1644,
which returns info about transaction, which can be used to count movements on addresses:
{"txid":"5ea8683cf3f216f55e93e8990f0fc6bde48bc8f00338f69f5c499dca10db1644","version":1,"locktime":0,"vin":[{"coinbase":"035e9504062f503253482f0436cf0454082801d970750000000d2f6e6f64655374726174756d2f","sequence":0,"n":0}],"vout":[{"value":"20000.00000000","n":0,"scriptPubKey":{"asm":"OP_DUP OP_HASH160 d239df11538abd398c50a979eef410f6cbf12eb6 OP_EQUALVERIFY OP_CHECKSIG","reqSigs":1,"type":"pubkeyhash","addresses":["KSNiY9JzAKSuaT6wg42hCtMcfzNEoeWmw3"]}}],"blockhash":"250422ab30233222e31bda3774f388a7972fd4f3aa59b75cf9fa3919bc740c02","confirmations":11,"time":1409601200,"blocktime":1409601200,"isCoinBase":true,"valueOut":20000,"size":124}
Simply save everything into DB and than use selects and display it into fancy GUI:) Simple as that. Any developer with 6+ month experience in any language can do that.
