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Is amber the sole signer, and all the above are simply nostr apps that support interaction with the signer?
Discussion
Yes.
There's another signer in development now by nostr:nprofile1qqszjvsfwh0c2hlrffa5ttdzgg0zcaquxlqpx6gplerhzvafr6cckpcpp4mhxue69uhkummn9ekx7mqpzpmhxue69uhkummnw3ezuamfdejsz9rhwden5te0wfjkccte9ejxzmt4wvhxjmcp2f564