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gnomic_airdrop package

Overview

Claim-based airdrop realm with Merkle proofs.

Why Merkle rather than an on-chain list:

  • the beneficiary list can run to tens of thousands of rows; writing it on-chain costs gas and storage deposit in proportion;
  • here only 32 bytes go on-chain (the root), plus one record per ACTUAL claim. Whoever never claims costs nothing.

Operating flow:

  1. deploy this realm;
  2. fund it by transferring GRC20 tokens to it (its address is returned by RealmAddress());
  3. the admin publishes root, leaf count and deadline block with SetCampaign;
  4. each beneficiary calls Claim with their own proof;
  5. after the deadline the admin recovers the residue with Sweep.

The Merkle leaf is the string "<address>|<amount in base units>", UTF-8 encoded. The tree is Tendermint's "simple tree" (gno's crypto/merkle): leaf = SHA256(0x00||data), node = SHA256(0x01||left||right), split at the largest power of two below n. The generator in tools/merkle produces compatible proofs.

Function

NextWithdrawAt

func NextWithdrawAt(addr address) int64

NextWithdrawAt returns the unix time from which addr may withdraw again (0 when there is no grant, the grant is closed, or no cooldown is running).

Param

Command

gnokey query vm/qeval -remote "http://127.0.0.1:26657" -data "gno.land/r/nym-thegnomic001/gnomic_airdrop.NextWithdrawAt()"

Result