"Informant" works very well, I think, but, just out of curiosity - why does "spy" seem too modern? It seems to be attested in Middle English, possibly as early as 1250 or so.
https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary/MED42192
https://www.merriam-webster.com/dictionary/spy#word-history
Maike Claußnitzer
npub153…fqrjq
2026-08-31 18:02:53 UTC
in reply to nevent1q…prdx
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npub153yvz07enrjlqjgjax0yz4ylq9hm8uzsz8trvlv5zp6ezxsvhjtqmfqrjqSeen on
wss://relay.momostr.pinkPublished at
2026-08-31 18:02:53 UTCEvent JSON
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