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Today, it is possible to fetch a block's spent prevouts in order to build an external index by using the `/rest/block/HASH.json` endpoint. However, its performance is low due to JSON serialization overhead. We can significantly optimize it by adding a new REST endpoint, using a binary response format: ``` $ BLOCKHASH=00000000000000000002a7c4c1e48d76c5a37902165a270156b7a8d72728a054 $ ab -k -c 1 -n 100 http://localhost:8332/rest/block/$BLOCKHASH.json Document Length: 13278152 bytes Requests per second: 3.53 [#/sec] (mean) Time per request: 283.569 [ms] (mean) $ ab -k -c 1 -n 10000 http://localhost:8332/rest/spentoutputs/$BLOCKHASH.bin Document Length: 195591 bytes Requests per second: 254.47 [#/sec] (mean) Time per request: 3.930 [ms] (mean) ``` Currently, this PR is being used and tested by Bindex: * https://github.com/romanz/bindex-rs This PR would allow to improve the performance of external indexers such as electrs, ElectrumX, Fulcrum and Blockbook: * https://github.com/romanz/electrs (also https://github.com/Blockstream/electrs and https://github.com/mempool/electrs) * https://github.com/spesmilo/electrumx * https://github.com/cculianu/Fulcrum * https://github.com/trezor/blockbook