enum ValidatorTier {
  NONE = 0,        // not a validator
  BRONZE = 1,      // BASIC tier, >= 10,000 NOTA
  SILVER = 2,      // PROFESSIONAL tier, >= 50,000 NOTA
  GOLD = 3,        // ENTERPRISE tier, >= 250,000 NOTA
  PLATINUM = 4,    // INSTITUTIONAL tier, >= 1,000,000 NOTA
}

async stake(amount: bigint): Promise<string>

async unstake(): Promise<string>

async claimStake(): Promise<string>

async getValidatorInfo(address: string): Promise<ValidatorInfo>

interface ValidatorInfo {
  stakedAmount: bigint;
  tier: ValidatorTier;
  isActive: boolean;
  slashCount: number;
  dailyVerifications: bigint;
  lastVerificationDay: bigint;
  unbondingAmount: bigint;
  unbondingEndTime: bigint;
}

async getTier(address: string): Promise<ValidatorTier>

async getDailyVerificationsRemaining(address: string): Promise<bigint>

async getTierThreshold(tier: ValidatorTier): Promise<bigint>

import { Notareum, ValidatorTier } from "@notareum/sdk";
import { Contract, parseUnits } from "ethers";

const ntm = Notareum({ provider, signer, contracts });

// 1. Approve NOTA for the staking contract
const notaAbi = ["function approve(address,uint256) returns (bool)"];
const amount = parseUnits("10000", 18); // 10,000 NOTA for BASIC
const nota = new Contract(contracts.notaToken, notaAbi, signer);
await (await nota.approve(contracts.validatorStaking, amount)).wait();

// 2. Stake
const txHash = await ntm.staking.stake(amount);
console.log("Staked:", txHash);

// 3. Inspect
const me = await signer.getAddress();
const info = await ntm.staking.getValidatorInfo(me);
console.log(`Tier: ${ValidatorTier[info.tier]}, active: ${info.isActive}`);

// 4. Much later, exit
await ntm.staking.unstake();
// Wait 14 days...
await ntm.staking.claimStake();