Cost model (how to compute exactly) - Fee = tx_bytes × fee_…

Cost model (how to compute exactly)
- Fee = tx_bytes × fee_rate_sats_per_byte × (USD_per_BSV / 1e8)
- Typical small tx sizes you’d use:
- Post a 32-byte audit hash (OP_RETURN): ~250–400 bytes
- Update a session key (state transition UTXO + change + optional OP_RETURN): ~250–500 bytes
- Consume on-chain nonce (spend previous state UTXO, create new state): ~250–500 bytes
- Fee-rate range to model: 0.05–0.5 sat/byte (miners set policy; under load some use ~1 sat/byte)
- Example BSV price band to model: $20–$120/BSV (plug in live price for precision)