Proof of History

The verifiable clock

dPOH is a SHA-256 hash chain that advances whether or not anything happens. Each tick hashes the one before it, so the number of ticks between two events is itself a proof that time passed — and the ordering inside a slot is settled before consensus ever votes on it. This is the one thing on Kortana that has no Ethereum equivalent.

Sequence

21,787,200,010

ticks since genesis

Ticks per slot

1,500 ms slot

Checkpoint every

4,096

2,570 since the last

Epoch

312 / 2,400 slots

Progress through epoch 15

13.00% · the validator set is fixed for the whole epoch, so it changes only when this fills (§24.1)

Current tick

Hash0x3afa621105281e9b782a0cee9102a916b24a342726ba709a5c1faaeafc31d016

Sequence21,787,200,010

Checkpoint every4,096 ticks · 2,570 since the last one

Slot36,312 · reported by the node, not derived from the sequence

A checkpoint is where the chain records the tick hash so a verifier can resume from it instead of replaying from genesis. The sequence above is the authority on ordering — two events in the same slot are ordered by their ticks, which is settled before any vote is cast.