Greenlight (Blockstream) Greenlight is a "hosted self-custodial Lightning" service. Blockstream runs CLN nodes on its infrastructure. Users hold private keys on their device and sign via the signer protocol . Service: <https://blockstream.com/lightning/greenlight/ Architecture - User device: holds master seed, runs library. - Cloud: runs CLN with no key access; pings device for sigs. - Network: TLS-mutual-auth between device and cloud. When CLN needs to sign anything (commitment, HTLC), it sends a signing request via the signer protocol. The device-side signer validates the request, signs, an…