Chronologically sorting transactions within a block Is there any way to chronologically sort transactions within a block?
The arrow-of-time in bitcoin is achieved through the blockchain. The whole point of proof-of-work is to arrange transactions in chronological order, to prevent double-spending.

Under this light, transactions in the same block cannot be put in strict chronological order; the time each miner saw an unverified transaction varies depending on their view of the network. The only certain order is that transactions in a future block happened after transactions in a past block (a parent block) on the blockchain.

You can order transactions heuristically if you want, but this is not cryptographically secure. One way to do it is to look at when they first appeared on the network, e.g. on blockchain.info or some other such service.