lib.rs

			// The choice of `c` parameter (where `1 - c` represents the
			// probability of a slot being empty), is done in accordance to the
			// slot duration and expected target block time, for safely
			// resisting network delays of maximum two seconds.
			// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
			babe_primitives::BabeGenesisConfiguration {
				slot_duration: Babe::slot_duration(),
				epoch_length: EpochDurationInBlocks::get().into(),
				c: BABE_GENESIS_EPOCH_CONFIG.c,
				genesis_authorities: Babe::authorities(),
				randomness: Babe::randomness(),
				allowed_slots: BABE_GENESIS_EPOCH_CONFIG.allowed_slots,
			}
		}

		fn current_epoch_start() -> babe_primitives::Slot {
			Babe::current_epoch_start()
		}

		fn current_epoch() -> babe_primitives::Epoch {
			Babe::current_epoch()
		}

		fn next_epoch() -> babe_primitives::Epoch {
			Babe::next_epoch()
		}

		fn generate_key_ownership_proof(
			_slot: babe_primitives::Slot,
			authority_id: babe_primitives::AuthorityId,
		) -> Option<babe_primitives::OpaqueKeyOwnershipProof> {
			use parity_scale_codec::Encode;

			Historical::prove((babe_primitives::KEY_TYPE, authority_id))
				.map(|p| p.encode())
				.map(babe_primitives::OpaqueKeyOwnershipProof::new)
		}

		fn submit_report_equivocation_unsigned_extrinsic(
			equivocation_proof: babe_primitives::EquivocationProof<<Block as BlockT>::Header>,
			key_owner_proof: babe_primitives::OpaqueKeyOwnershipProof,
		) -> Option<()> {
			let key_owner_proof = key_owner_proof.decode()?;

			Babe::submit_unsigned_equivocation_report(
				equivocation_proof,
				key_owner_proof,
			)
		}
	}

	impl authority_discovery_primitives::AuthorityDiscoveryApi<Block> for Runtime {
		fn authorities() -> Vec<AuthorityDiscoveryId> {
			runtime_api_impl::relevant_authority_ids::<Runtime>()
		}
	}

	impl sp_session::SessionKeys<Block> for Runtime {
		fn generate_session_keys(seed: Option<Vec<u8>>) -> Vec<u8> {
			SessionKeys::generate(seed)
		}

		fn decode_session_keys(
			encoded: Vec<u8>,
		) -> Option<Vec<(Vec<u8>, sp_core::crypto::KeyTypeId)>> {
			SessionKeys::decode_into_raw_public_keys(&encoded)
		}
	}

	impl beefy_primitives::BeefyApi<Block, BeefyId> for Runtime {
		fn validator_set() -> beefy_primitives::ValidatorSet<BeefyId> {
			Beefy::validator_set()
		}
	}

	impl pallet_mmr_primitives::MmrApi<Block, Hash> for Runtime {
		fn generate_proof(leaf_index: u64)
			-> Result<(mmr::EncodableOpaqueLeaf, mmr::Proof<Hash>), mmr::Error>
		{
			Mmr::generate_proof(leaf_index)
				.map(|(leaf, proof)| (mmr::EncodableOpaqueLeaf::from_leaf(&leaf), proof))
		}

		fn verify_proof(leaf: mmr::EncodableOpaqueLeaf, proof: mmr::Proof<Hash>)
			-> Result<(), mmr::Error>
		{
			pub type Leaf = <
				<Runtime as pallet_mmr::Config>::LeafData as mmr::LeafDataProvider
			>::LeafData;

			let leaf: Leaf = leaf
				.into_opaque_leaf()
				.try_decode()
				.ok_or(mmr::Error::Verify)?;
			Mmr::verify_leaf(leaf, proof)
		}

		fn verify_proof_stateless(
			root: Hash,
			leaf: mmr::EncodableOpaqueLeaf,
			proof: mmr::Proof<Hash>
		) -> Result<(), mmr::Error> {
			type MmrHashing = <Runtime as pallet_mmr::Config>::Hashing;
			let node = mmr::DataOrHash::Data(leaf.into_opaque_leaf());
			pallet_mmr::verify_leaf_proof::<MmrHashing, _>(root, node, proof)
		}
	}

	impl frame_system_rpc_runtime_api::AccountNonceApi<Block, AccountId, Nonce> for Runtime {
		fn account_nonce(account: AccountId) -> Nonce {
			System::account_nonce(account)
		}
	}

	impl pallet_transaction_payment_rpc_runtime_api::TransactionPaymentApi<
		Block,
		Balance,
	> for Runtime {
		fn query_info(uxt: <Block as BlockT>::Extrinsic, len: u32) -> RuntimeDispatchInfo<Balance> {
			TransactionPayment::query_info(uxt, len)
		}
		fn query_fee_details(uxt: <Block as BlockT>::Extrinsic, len: u32) -> FeeDetails<Balance> {
			TransactionPayment::query_fee_details(uxt, len)
		}
	}
}