Read an Anchor with no SDK

import { PublicKey, Connection } from "@solana/web3.js";

const ENTROS_ANCHOR_PROGRAM_ID = new PublicKey(
  "GZYwTp2ozeuRA5Gof9vs4ya961aANcJBdUzB7LN6q4b2",
);

function deriveAnchorPda(wallet: PublicKey): PublicKey {
  const [pda] = PublicKey.findProgramAddressSync(
    [Buffer.from("identity"), wallet.toBuffer()],
    ENTROS_ANCHOR_PROGRAM_ID,
  );
  return pda;
}

async function readAnchor(
  connection: Connection,
  wallet: PublicKey,
): Promise<{ trustScore: number; lastVerifiedAt: number } | null> {
  const pda = deriveAnchorPda(wallet);
  const account = await connection.getAccountInfo(pda);
  if (!account) return null;

  return {
    // i64 little-endian at offset 48, unix seconds
    lastVerifiedAt: Number(account.data.readBigInt64LE(48)),
    // u16 little-endian at offset 60
    trustScore: account.data.readUInt16LE(60),
  };
}

import { Connection, PublicKey } from "@solana/web3.js";
import { NextRequest, NextResponse } from "next/server";

export async function POST(req: NextRequest) {
  const { wallet } = await req.json();

  const connection = new Connection(
    process.env.SOLANA_RPC_URL ?? "https://api.devnet.solana.com",
  );
  const anchor = await readAnchor(connection, new PublicKey(wallet));
  if (!anchor) {
    return NextResponse.json({ allowed: false }, { status: 403 });
  }

  const ageSeconds = Math.floor(Date.now() / 1000) - anchor.lastVerifiedAt;
  const allowed = anchor.trustScore >= 100 && ageSeconds <= 86_400;

  return allowed
    ? NextResponse.json({ allowed: true, score: anchor.trustScore })
    : NextResponse.json({ allowed: false }, { status: 403 });
}