Module single_node 

SingleNodePayment construction, on-chain payment, and verification. SingleNode payment strategy.

• Client gets CLOSE_GROUP_SIZE quotes from network
• Sort by price and select median (index CLOSE_GROUP_SIZE / 2)
• Pay ONLY the median-priced node with 3x the quoted amount
• Other nodes get Amount::ZERO
• All are submitted for payment and verification

Total cost is the same as Standard mode (3x), but with one actual payment. This saves gas fees while maintaining the same total payment amount.

pay and verify are co-located on purpose: the same crate must own both sides of the protocol so the client and node cannot drift.

Structs

QuotePaymentInfo

Information about a single quote payment

SingleNodePayment

Single node payment structure for a chunk.