The Ark Round Signing Ceremony
summary
Arc implements off-chain VTXO refresh rounds built on Taproot (BIP 340/341/342) and demonstrated using Bark 0.4.0 plus the Rust Bitcoin kernel for consensus testing. Rounds run periodically (example: hourly) with an expiry parameter shown as 4,032 blocks (~28 days); signing produces a fully signed timeout tree (demo root had 16 participant signatures and the coordinator as additional signer) that the server persists then broadcasts. Current implementations limit trees for nonce bandwidth to about 64,000 leaves; protocol is functional and round persistence supports server restarts.
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chapters (15)
- 0:00Ark round signing ceremony intro
- 1:14Building VTXOs and timeout trees
- 3:46Canonical Ark round demo
- 10:34Collecting payments and parameters
- 12:40Submitting payments and nonces
- 14:29Signing timeout tree with Taproot
- 16:39Broadcasting the signed round
- 18:53Self-custody and Taproot use case
- 19:18Q&A on round size and triggers
- 21:25Ark round limitations and scalability
- 22:08Covenant proposals for liveness
- 23:10Server continuity and backups
- 23:52Ark participants and clients
- 24:54Unwinding timeout trees and exits
- 25:57Closing remarks
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