Verified incoming transfers against Monero Wallet PRC
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Executable
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import { createHash, randomUUID } from 'node:crypto';
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import type { Pool, PoolClient } from 'pg';
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import { z } from 'zod';
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import { assertXmrRpcAmount, parseAtomicXmr } from '../../shared/xmr-amount.ts';
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import { address, verifySignature } from '../testnet/consensus.ts';
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import { CUSTODY_WRITE_LOCK } from './postgres-schema.ts';
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const hex = z.string().regex(/^[a-f0-9]{64}$/);
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const fingerprint = hex;
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const publicKey = z.string().min(1).max(256);
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const signature = z.string().min(1).max(256);
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const uuid = z.string().uuid();
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const POLICY_VERSION = 'monero-pending-credit-v1';
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const MAX_EVENT_HISTORY = 256;
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export type DepositCreditPolicy = {
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/** Reviewed key-owner hashes; the signing key remains operator-held and is never stored here. */
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approvedReviewerOwners: readonly string[];
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/** Provisional floor; a production value still requires explicit approval. */
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minimumConfirmations: number;
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/** Refuse credit review when observation scans have gone stale. */
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maximumObservationAgeMs: number;
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};
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export type DepositCreditReviewSubject = {
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policyVersion: typeof POLICY_VERSION;
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walletFingerprint: string;
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observationId: string;
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outputPublicKey: string;
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amountAtomicXmr: string;
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blockHeight: number;
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confirmations: number;
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minimumConfirmations: number;
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locked: boolean;
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doubleSpendSeen: boolean;
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allocationId: string;
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beneficiary: string;
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observationDigest: string;
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observationEventSequence: number;
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observationEventHistoryDigest: string;
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observerUpdatedAt: number;
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};
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export type DepositCreditApproval = {
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subject: DepositCreditReviewSubject;
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reviewerOwner: string;
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reviewerPublicKey: string;
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nonce: string;
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expiresAt: number;
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signature: string;
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};
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export type DepositCreditResult = { creditId: string; journalId: string; beneficiary: string; amountAtomicXmr: string; replayed: boolean };
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const subjectSchema = z.object({
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policyVersion: z.literal(POLICY_VERSION), walletFingerprint: fingerprint, observationId: z.string().min(129).max(160),
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outputPublicKey: hex, amountAtomicXmr: z.string().regex(/^[1-9]\d{0,19}$/),
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blockHeight: z.number().int().positive().safe(), confirmations: z.number().int().positive().safe(),
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minimumConfirmations: z.number().int().min(10).max(100_000), locked: z.boolean(), doubleSpendSeen: z.boolean(),
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allocationId: uuid, beneficiary: hex, observationDigest: hex,
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observationEventSequence: z.number().int().nonnegative().safe(), observationEventHistoryDigest: hex,
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observerUpdatedAt: z.number().int().nonnegative().safe(),
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}).strict();
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const approvalSchema = z.object({ subject: subjectSchema, reviewerOwner: hex, reviewerPublicKey: publicKey,
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nonce: uuid, expiresAt: z.number().int().nonnegative().safe(), signature }).strict();
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function digest(value: string): string { return createHash('sha256').update(value).digest('hex'); }
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function canonicalReviewMessage(subject: DepositCreditReviewSubject, reviewerOwner: string, nonce: string, expiresAt: number): string {
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return JSON.stringify(['wikideck-monero-pending-credit-review-v1', reviewerOwner, nonce, expiresAt,
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subject.policyVersion, subject.walletFingerprint, subject.observationId, subject.outputPublicKey,
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subject.amountAtomicXmr, subject.blockHeight, subject.confirmations, subject.minimumConfirmations,
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subject.locked, subject.doubleSpendSeen, subject.allocationId, subject.beneficiary,
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subject.observationDigest, subject.observationEventSequence, subject.observationEventHistoryDigest,
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subject.observerUpdatedAt]);
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}
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function validatePolicy(policy: DepositCreditPolicy): void {
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if (!Array.isArray(policy.approvedReviewerOwners) || !policy.approvedReviewerOwners.length ||
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policy.approvedReviewerOwners.length > 8 || policy.approvedReviewerOwners.some(owner => !hex.safeParse(owner).success) ||
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!Number.isSafeInteger(policy.minimumConfirmations) || policy.minimumConfirmations < 10 || policy.minimumConfirmations > 100_000 ||
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!Number.isSafeInteger(policy.maximumObservationAgeMs) || policy.maximumObservationAgeMs < 10_000 || policy.maximumObservationAgeMs > 15 * 60_000) {
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throw new Error('Invalid private Monero deposit-credit policy');
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}
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}
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async function readReviewSubject(client: PoolClient, walletFingerprint: string, observationId: string,
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policy: DepositCreditPolicy, now: number): Promise<DepositCreditReviewSubject> {
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const observation = await client.query(`SELECT o.wallet_fingerprint,o.observation_id,o.txid,o.monero_address,o.account_index,
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o.address_index,o.output_public_key,o.amount_atomic_xmr::text,o.block_height,o.confirmations,o.locked,
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o.double_spend_seen,o.payload_digest,o.currently_present,s.updated_at AS observer_updated_at
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FROM wk_custody.monero_transfer_observations o
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JOIN wk_custody.monero_observer_state s USING(wallet_fingerprint)
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WHERE o.wallet_fingerprint=$1 AND o.observation_id=$2`, [walletFingerprint, observationId]);
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if (observation.rowCount !== 1) throw new Error('Deposit observation not found');
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const row = observation.rows[0];
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if (!row.output_public_key || row.observation_id !== `${row.txid}:${row.output_public_key}` || !row.currently_present ||
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row.double_spend_seen || row.locked || Number(row.confirmations) < policy.minimumConfirmations) {
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throw new Error('Deposit observation is not eligible for reviewed pending credit');
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}
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if (now - Number(row.observer_updated_at) < 0 || now - Number(row.observer_updated_at) > policy.maximumObservationAgeMs) {
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throw new Error('Monero observer state is stale');
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}
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const amount = BigInt(row.amount_atomic_xmr);
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assertXmrRpcAmount(amount);
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parseAtomicXmr(amount.toString());
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const allocation = await client.query(`SELECT allocation_id,beneficiary,custodian_id,market_network,market_chain_id
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FROM wk_custody.monero_deposit_allocations
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WHERE wallet_fingerprint=$1 AND account_index=$2 AND address_index=$3 AND monero_address=$4 AND status='registered'`,
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[walletFingerprint, row.account_index, row.address_index, row.monero_address]);
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if (allocation.rowCount !== 1) throw new Error('Deposit output has no unique registered beneficiary allocation');
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const identity = await client.query("SELECT value FROM wk_custody.custody_meta WHERE key='identity'");
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if (identity.rowCount !== 1) throw new Error('Custodian identity is unavailable');
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const custodian = JSON.parse(identity.rows[0].value) as { id?: string; network?: string; chainId?: string; mode?: string };
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const mapped = allocation.rows[0];
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if (custodian.mode !== 'sandbox' || mapped.custodian_id !== custodian.id || mapped.market_network !== custodian.network ||
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mapped.market_chain_id !== custodian.chainId) throw new Error('Deposit allocation is outside this custody identity');
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const events = await client.query(`SELECT sequence,event_type,payload_digest,wallet_height,observed_at
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FROM wk_custody.monero_observation_events WHERE wallet_fingerprint=$1 AND observation_id=$2
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ORDER BY sequence LIMIT $3`, [walletFingerprint, observationId, MAX_EVENT_HISTORY + 1]);
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if ((events.rowCount ?? events.rows.length) > MAX_EVENT_HISTORY) throw new Error('Deposit observation event history exceeds review bound');
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if (events.rows.some(event => event.event_type === 'not-seen' || event.event_type === 'reappeared')) {
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throw new Error('Deposit observation has prior disappearance/reappearance and requires separate review');
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}
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const sequence = events.rows.length ? Number(events.rows.at(-1)!.sequence) : 0;
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const eventDigest = digest(JSON.stringify(events.rows.map(event => [Number(event.sequence), event.event_type,
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event.payload_digest, Number(event.wallet_height), Number(event.observed_at)])));
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return {
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policyVersion: POLICY_VERSION, walletFingerprint, observationId, outputPublicKey: row.output_public_key,
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amountAtomicXmr: amount.toString(), blockHeight: Number(row.block_height), confirmations: Number(row.confirmations),
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minimumConfirmations: policy.minimumConfirmations, locked: row.locked, doubleSpendSeen: row.double_spend_seen,
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allocationId: mapped.allocation_id, beneficiary: mapped.beneficiary, observationDigest: row.payload_digest,
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observationEventSequence: sequence, observationEventHistoryDigest: eventDigest,
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observerUpdatedAt: Number(row.observer_updated_at),
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};
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}
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/** Return the exact current snapshot an authorized operator must review and sign. */
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export async function prepareDepositCreditReview(pool: Pool, walletFingerprint: string, observationId: string,
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policy: DepositCreditPolicy, now = Date.now()): Promise<DepositCreditReviewSubject> {
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validatePolicy(policy); fingerprint.parse(walletFingerprint);
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const c = await pool.connect();
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try {
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await c.query('BEGIN ISOLATION LEVEL REPEATABLE READ READ ONLY');
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await c.query("SET LOCAL statement_timeout='10s'; SET LOCAL lock_timeout='3s'; SET LOCAL idle_in_transaction_session_timeout='10s'");
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const subject = await readReviewSubject(c, walletFingerprint, observationId, policy, now);
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await c.query('COMMIT'); return subject;
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} catch (error) { await c.query('ROLLBACK').catch(() => {}); throw error; }
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finally { c.release(); }
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}
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/** Canonical message an allow-listed reviewer signs after examining the exact output/allocation snapshot. */
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export function depositCreditApprovalMessage(subject: DepositCreditReviewSubject, reviewerOwner: string, nonce: string,
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expiresAt: number): string {
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return canonicalReviewMessage(subjectSchema.parse(subject), hex.parse(reviewerOwner), uuid.parse(nonce), expiresAt);
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}
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/**
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* Posts an operator-reviewed credit into a non-spendable pending-liability account. This service is not
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* wired to HTTP/startup; release to available balance is a separate, not-yet-implemented approval step.
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*/
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export async function postReviewedDepositPendingCredit(pool: Pool, rawApproval: DepositCreditApproval,
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policy: DepositCreditPolicy, now = Date.now()): Promise<DepositCreditResult> {
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validatePolicy(policy);
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const approval = approvalSchema.parse(rawApproval);
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if (!policy.approvedReviewerOwners.includes(approval.reviewerOwner) ||
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address(approval.reviewerPublicKey) !== approval.reviewerOwner ||
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!verifySignature(approval.reviewerPublicKey, approval.reviewerOwner,
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canonicalReviewMessage(approval.subject, approval.reviewerOwner, approval.nonce, approval.expiresAt), approval.signature)) {
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throw new Error('Deposit credit review signature is invalid');
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}
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const reviewDigest = digest(canonicalReviewMessage(approval.subject, approval.reviewerOwner, approval.nonce, approval.expiresAt));
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const client = await pool.connect();
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try {
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await client.query('BEGIN');
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await client.query("SET LOCAL statement_timeout='10s'; SET LOCAL lock_timeout='3s'; SET LOCAL idle_in_transaction_session_timeout='10s'; SET LOCAL synchronous_commit=on");
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await client.query('SELECT pg_advisory_xact_lock($1::bigint)', [CUSTODY_WRITE_LOCK]);
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const existing = await client.query(`SELECT credit_id,journal_id,beneficiary,amount_atomic_xmr::text,reviewer_owner,
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review_nonce,observation_digest,allocation_id::text,reviewer_public_key,review_expires_at,review_signature,
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minimum_confirmations,review_digest FROM wk_custody.monero_deposit_credit_events
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WHERE wallet_fingerprint=$1 AND observation_id=$2`,
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[approval.subject.walletFingerprint, approval.subject.observationId]);
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if (existing.rowCount) {
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const saved = existing.rows[0];
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if (saved.reviewer_owner !== approval.reviewerOwner || saved.review_nonce !== approval.nonce ||
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saved.observation_digest !== approval.subject.observationDigest || saved.amount_atomic_xmr !== approval.subject.amountAtomicXmr ||
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saved.allocation_id !== approval.subject.allocationId || saved.minimum_confirmations !== approval.subject.minimumConfirmations ||
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saved.reviewer_public_key !== approval.reviewerPublicKey || Number(saved.review_expires_at) !== approval.expiresAt ||
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saved.review_signature !== approval.signature || saved.review_digest !== reviewDigest) {
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throw new Error('Deposit output was already staged under different reviewed terms');
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}
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await client.query('COMMIT');
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return { creditId: saved.credit_id, journalId: saved.journal_id, beneficiary: saved.beneficiary,
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amountAtomicXmr: saved.amount_atomic_xmr, replayed: true };
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}
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if (approval.expiresAt < now || approval.expiresAt > now + 5 * 60_000) {
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throw new Error('Deposit credit review signature is expired or outside the allowed window');
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}
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const current = await readReviewSubject(client, approval.subject.walletFingerprint, approval.subject.observationId, policy, now);
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if (JSON.stringify(current) !== JSON.stringify(approval.subject)) throw new Error('Deposit observation changed after reviewer approval');
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const creditId = randomUUID();
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const journalId = `monero-deposit-pending:${digest(`${current.walletFingerprint}:${current.observationId}`)}`;
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const assetAccount = 'treasury:monero:pending';
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const liabilityAccount = `customer:${current.beneficiary}:deposit-pending:${creditId}`;
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await client.query('INSERT INTO wk_custody.journals(id,kind,created) VALUES($1,$2,$3)',
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[journalId, 'monero-deposit-pending-credit', now]);
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const lines = [[0, assetAccount, 'debit'], [1, liabilityAccount, 'credit']] as const;
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for (const [position, accountId, normal] of lines) {
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await client.query('INSERT INTO wk_custody.accounts(id,normal) VALUES($1,$2) ON CONFLICT(id) DO NOTHING', [accountId, normal]);
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const account = await client.query('SELECT normal FROM wk_custody.accounts WHERE id=$1', [accountId]);
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if (account.rows[0]?.normal !== normal) throw new Error('Deposit pending account normal mismatch');
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await client.query('INSERT INTO wk_custody.entries VALUES($1,$2,$3,$4,$5)',
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[journalId, position, accountId, normal === 'debit' ? current.amountAtomicXmr : '0',
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normal === 'credit' ? current.amountAtomicXmr : '0']);
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}
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await client.query(`INSERT INTO wk_custody.monero_deposit_credit_events(
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credit_id,wallet_fingerprint,observation_id,allocation_id,beneficiary,amount_atomic_xmr,journal_id,
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observation_digest,last_observation_event_sequence,reviewer_owner,reviewer_public_key,review_nonce,
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review_expires_at,review_signature,review_subject,review_digest,credited_at,minimum_confirmations)
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VALUES($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17,$18)`,
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[creditId, current.walletFingerprint, current.observationId, current.allocationId, current.beneficiary,
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current.amountAtomicXmr, journalId, current.observationDigest, current.observationEventSequence,
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approval.reviewerOwner, approval.reviewerPublicKey, approval.nonce, approval.expiresAt, approval.signature,
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JSON.stringify(current), reviewDigest, now, current.minimumConfirmations]);
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await client.query('COMMIT');
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return { creditId, journalId, beneficiary: current.beneficiary, amountAtomicXmr: current.amountAtomicXmr, replayed: false };
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} catch (error) { await client.query('ROLLBACK').catch(() => {}); throw error; }
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finally { client.release(); }
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}
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/** Append review holds for post-credit Monero reorg signals; this never reverses a journal or releases pending funds. */
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export async function reconcileDepositCreditReorgHolds(pool: Pool, walletFingerprint: string, now = Date.now()): Promise<number> {
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fingerprint.parse(walletFingerprint);
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const client = await pool.connect();
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try {
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await client.query('BEGIN');
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await client.query("SET LOCAL statement_timeout='10s'; SET LOCAL lock_timeout='3s'; SET LOCAL synchronous_commit=on");
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await client.query('SELECT pg_advisory_xact_lock($1::bigint)', [CUSTODY_WRITE_LOCK]);
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const reorgs = await client.query(`SELECT c.credit_id,c.observation_id,e.sequence,e.event_type
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FROM wk_custody.monero_deposit_credit_events c
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JOIN wk_custody.monero_observation_events e ON e.wallet_fingerprint=c.wallet_fingerprint
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AND e.observation_id=c.observation_id AND e.sequence>c.last_observation_event_sequence
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WHERE c.wallet_fingerprint=$1 AND e.event_type IN ('changed','not-seen','reappeared')
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AND NOT EXISTS (SELECT 1 FROM wk_custody.monero_deposit_reorg_holds h
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WHERE h.credit_id=c.credit_id AND h.observation_event_sequence=e.sequence)
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ORDER BY e.sequence LIMIT 1024`, [walletFingerprint]);
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for (const row of reorgs.rows) {
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await client.query(`INSERT INTO wk_custody.monero_deposit_reorg_holds(
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hold_id,credit_id,wallet_fingerprint,observation_id,observation_event_sequence,event_type,created_at)
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VALUES($1,$2,$3,$4,$5,$6,$7) ON CONFLICT(credit_id,observation_event_sequence) DO NOTHING`,
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[randomUUID(), row.credit_id, walletFingerprint, row.observation_id, row.sequence, row.event_type, now]);
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}
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await client.query('COMMIT'); return reorgs.rowCount ?? 0;
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} catch (error) { await client.query('ROLLBACK').catch(() => {}); throw error; }
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finally { client.release(); }
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}
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