j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutLáperhaps a flywheel holds a cryptographic private key as if it were a puzzle-dongle of sorts, unlocked by inertia or some such, and this could be installed in the users choice of: bicycle, rowing machine, stair machine, etc.
text/plaintext twetch_twtext_1591036882148.txt|"1PuQa7K62MiKCtssSLKy1kh56WWU7MtUR5SET twdata_jsonnullurlnullcommentnullmb_user725reply@87f74747a09de08dfb9fd7da949ce21bee1b2e98a8135c42963cf375709f7fdbtypepost timestampnullapptwetchinvoice$7919e0ec-f9b0-4017-a7f9-c0f8d6840a32|"15PciHG22SNLQJXMoSUaWVi7WSqc7hCfva
BITCOIN_ECDSA"1D7de6e9xuwU4nJBeXymNLGjkFHCNzEbDjLXH7hG2eTfFhngTeySr0PKVLQCcZu8x1zN0zTeQSjSAL4rEIvgW1YO2Hvd6ZfR/osz8ekSGQXcTVT3Io8k6zO9/tk=
https://whatsonchain.com/tx/8b56aa49b53ca4bd577fbe0f560ac13aa61c5f01c5509c8879ff85a6c377519b