Dryja-Poon Channel

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Path	Signatures	Use
Funding	Alice, Bob, operator	Open, renew, resize, or close the channel with the operator
Exit	Alice, Bob, after the exit delay	The operator is unavailable

Path

Signatures

Use

Funding

Alice, Bob, operator

Open, renew, resize, or close the channel with the operator

Exit

Alice, Bob, after the exit delay

The operator is unavailable

Build the funding output

import { MnemonicIdentity, MultisigTapscript, VtxoScript, networks } from '@arkade-os/sdk';

const alice = MnemonicIdentity.fromMnemonic('abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about', { isMainnet: false });
const bob = MnemonicIdentity.fromMnemonic('zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong', { isMainnet: false });
const alicePubkey = await alice.xOnlyPublicKey();
const bobPubkey = await bob.xOnlyPublicKey();

const fundingLeaf = MultisigTapscript.encode({
  pubkeys: [alicePubkey, bobPubkey, serverPubkey],
}).script;
const exitLeaf = CSVMultisigTapscript.encode({
  pubkeys: [alicePubkey, bobPubkey],
  timelock: exitTimelock,
}).script;

const funding = new VtxoScript([fundingLeaf, exitLeaf]);
console.log('Funding address:', funding.address(networks.mutinynet.hrp, serverPubkey).encode());

The two paths are:

Funding: <alicePubkey> OP_CHECKSIGVERIFY <bobPubkey> OP_CHECKSIGVERIFY <serverPubkey> OP_CHECKSIG
Exit:    <exitDelay> OP_CHECKSEQUENCEVERIFY OP_DROP <alicePubkey> OP_CHECKSIGVERIFY <bobPubkey> OP_CHECKSIG

Commitment transactions

The commitment transactions, revocation keys, and HTLC outputs that spend the funding output follow the Lightning specification (BOLT 3). Build them with your Lightning implementation.

One constraint is specific to Arkade: the funding output expires with its batch. Lightning Channels explains how that limits HTLC timeouts and when to renew the channel.

Overview

Working with Tapscript

Experimental

Build the funding output

Commitment transactions

​Build the funding output

​Commitment transactions

Build the funding output

Commitment transactions