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Sygnum and Debifi Unveil MultiSYG, a Bitcoin-Backed Lending Platform With Shared Control

The shared-control design aims to curb rehypothecation by keeping BTC collateral verifiable on-chain under a 3-of-5 key structure.

Overview

  • Sygnum Bank and Debifi announced MultiSYG on Oct. 24, 2025, positioning it for institutional and high-net-worth borrowers.
  • Collateral sits in a five-party wallet where any movement requires three approvals, including from the borrower, Sygnum, and independent signers.
  • The model is designed to prevent rehypothecation and provides continuous on-chain proof of the pledged bitcoin during the loan.
  • Sygnum highlights bank-grade lending terms such as pricing, drawdown flexibility, and loan duration while borrowers retain partial control of keys.
  • Public launch is planned for the first half of 2026, with the companies describing MultiSYG as a first-of-its-kind bank-backed approach to non-custodial BTC loans.