Abstract. A semi-centralized version of electronic cash would allow online Bitcoin payments to be sent from one party to another instantly, anonymously and free of charge without the permission of the backing financial institution. Chaumian e-cash provides part of the solution, but the main benefits are lost if a trusted third party is, that is required to prevent double-spending is not accountable. Our smaller contribution in this paper we propose an improvement to the accountability problem using a semi-centralized system. The system accepts Bitcoin deposits and withdrawals, similarly to custodial Bitcoin wallets. Contrary to these systems the backbone of the Bitcoin Cash wallet, in short b-cash wallet backbone is required to expose its master public key to the public. Therefore anyone can see the activity of this watch-only wallet on the Bitcoin Blockchain. Furthermore anyone who deposits and withdraws can independently verify the addresses are derived from the seed extended public key. Properly utilizing the accountability of the Bitcoin network is a major improvement to the accountability of centralized systems, however it is not a complete solution. The b-cash wallet backbone can still inflate the money supply, however it has less leg room for that. This improvement on Chaumian e-cash is not the main innovation of b-cash. From another point of view, b-cash is a second layer Bitcoin scaling solution, that has a side effect of enabling instant, anonymous transactions within its system for free of charge. The anonymity properties of Bitcoin Cash is orders of magnitude stronger, than the anonymity any decentralized or peer to peer network can hope to achieve. Thus the internal b-cash transactions cannot be prevented by the central issuer, since the central issuer is a blindly signing entity, it does not hold any information on the transaction, other than the fact that a transaction happened at a given time with a given value. www.github.com/nopara73