This is what a transaction with a single transfer operation without a memo looks like:
{
"ref_block_num": 65534,
"ref_block_prefix": 878476643,
"expiration": "2015-11-07T21:12:09",
"operations": [[
0,{
"fee": {
"amount": 4000000,
"asset_id": "1.3.0"
},
"from": "1.2.28788",
"to": "1.2.97102",
"amount": {
"amount": 10000000,
"asset_id": "1.3.0"
},
"extensions": []
}
]
],
"extensions": [],
"signatures": [
"1f4a55c5ae64ba8084d20583697a45e73f54abebe72d11bf388a9258e6125859956356e9021c51f015b68885b5023f6b3a2d9f733c3f79ad10331e658fdd872b64"
],
"operation_results": [[
0,{}
]
]
}
The identification information of sender and receiver is the account ids in the "from" and "to" fields.
Note that "coins" are handled differently from Bitcoin in that BitShares keeps an internal ledger of accounts and balances, whereas Bitcoin uses unspent transaction outputs.