SOURCES: https://benma.github.io/2021/02/09/coldcard-multisig-vulnerability.html https://www.coindesk.com/tech/2020/11/25/bypass-attack-in-coldcard-bitcoin-wallet-could-trick-users-into-sending-incorrect-funds/amp/ https://www.ledger.com/improving-the-ecosystem-disclosing-coldcards-pin-vulnerability