FOS Protocol Overview

FOS offers Fos Digital Collectibles as NFT consumer products, with protocol-defined promotional distributions, an independent referral program, and authenticity certificates on Robinhood Chain. Base remains the randomness-service chain in the supplied architecture: Chainlink VRF produces the random result there, and Chainlink CCIP carries requests and responses between Base and Robinhood.

Independent components

Component	Responsibility
FOSNFT	Mint the collectible, receive payment, retain admin fees, and fund free positions
Processor	Register collectibles, manage collection cycles, select recipients, and process allocations
Referral	Register one account per wallet, maintain direct referrals, sell plans, and handle upgrades
Verify	Issue a separate ERC-721 authenticity certificate and expose its current status

Referral registration is independent of NFT minting and selection processes. Verify integrations are optional and require explicit authorization.

Collection economics

Collection	Type ID	Nominal price	Admin fee	Admin per paid mint	Pool contribution per collectible	Full 500-collectible pool
Buddy	3	$3	5%	$0.15	$2.85	$1,425
Samurai	13	$13	3%	$0.39	$12.61	$6,305
Noble	25	$25	2%	$0.50	$24.50	$12,250

Dollar amounts describe the product model, not a dollar-denominated contract balance or guaranteed allocation. Payments and allocations use native ETH. Read the configured on-chain price before sending a transaction; the production USD-to-ETH conversion policy is not supplied in the contract specification.

Each collection has independent 500-collectible cycles. Positions 10, 100, 200, 300, and 400 are gas-only for the buyer, with their pool contributions funded from FOSNFT. Collectibles 1–100 carry double selection weight; collectibles 101–500 carry ordinary weight.

Allocation rules

Seventeen distinct collectible mint records, not necessarily seventeen wallets, are selected without replacement. The primary record's recipient receives 50% of the cycle allocation pool; six records' recipients split 30%; ten records' recipients split 20%. A wallet with several recorded mints can receive more than one allocation. Integer-rounding residue goes to the first recipient. Transfers are attempted directly; unsuccessful transfers become claimable through pendingWithdrawals and claim().

Referral plans

Referrer's active plan	Share of a direct referral's payment	Admin share
$2 plan	50%	50%
$5 plan	60%	40%
$10 plan	82%	18%

The referrer's own active plan at payment time determines the split, for both registration and upgrades. The buyer's plan determines the payment amount, not the commission percentage. Without a referrer, 100% goes to the admin. Dollar labels are nominal plan names; exact payment is the configured ETH price.

Allowed upgrades are 2→5, 2→10, and 5→10. The payment is the difference between configured prices at upgrade time, and the original direct referrer stays fixed.

Documentation status

This revision follows the supplied project contract specification. Product rules and reported deployments are distinct from independently verified on-chain behavior. Older claims about globally immutable parameters, same-transaction selection processes, a fixed 18× gas charge, and an implemented 365-day liquidation function are not established by the new specification. See security and validation.

Protocol Overview