From a642ade073d7c7a8b4e37f4f7595cc4c01cf4c4f Mon Sep 17 00:00:00 2001
From: Dmytro Kozhevin <dmytro@stellar.org>
Date: Wed, 22 May 2024 17:56:38 -0400
Subject: [PATCH 1/3] Add an example contract that demonstrates TTL testing
 techniques.

---
 ttl/Cargo.lock  | 1555 +++++++++++++++++++++++++++++++++++++++++++++++
 ttl/Cargo.toml  |   29 +
 ttl/Makefile    |   16 +
 ttl/src/lib.rs  |   47 ++
 ttl/src/test.rs |  152 +++++
 5 files changed, 1799 insertions(+)
 create mode 100644 ttl/Cargo.lock
 create mode 100644 ttl/Cargo.toml
 create mode 100644 ttl/Makefile
 create mode 100644 ttl/src/lib.rs
 create mode 100644 ttl/src/test.rs

diff --git a/ttl/Cargo.lock b/ttl/Cargo.lock
new file mode 100644
index 00000000..71b01a78
--- /dev/null
+++ b/ttl/Cargo.lock
@@ -0,0 +1,1555 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "arbitrary"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d5a26814d8dcb93b0e5a0ff3c6d80a8843bafb21b39e8e18a6f05471870e110"
+dependencies = [
+ "derive_arbitrary",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "backtrace"
+version = "0.3.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2089b7e3f35b9dd2d0ed921ead4f6d318c27680d4a5bd167b3ee120edb105837"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
+name = "base16ct"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c7f02d4ea65f2c1853089ffd8d2787bdbc63de2f0d29dedbcf8ccdfa0ccd4cf"
+
+[[package]]
+name = "base32"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23ce669cd6c8588f79e15cf450314f9638f967fc5770ff1c7c1deb0925ea7cfa"
+
+[[package]]
+name = "base64"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
+
+[[package]]
+name = "base64"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4a4ddaa51a5bc52a6948f74c06d20aaaddb71924eab79b8c97a8c556e942d6a"
+
+[[package]]
+name = "base64ct"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
+
+[[package]]
+name = "block-buffer"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "bumpalo"
+version = "3.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
+
+[[package]]
+name = "bytes-lit"
+version = "0.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0adabf37211a5276e46335feabcbb1530c95eb3fdf85f324c7db942770aa025d"
+dependencies = [
+ "num-bigint",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "cc"
+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "chrono"
+version = "0.4.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e3c5919066adf22df73762e50cffcde3a758f2a848b113b586d1f86728b673b"
+dependencies = [
+ "iana-time-zone",
+ "num-integer",
+ "num-traits",
+ "serde",
+ "winapi",
+]
+
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
+[[package]]
+name = "const-oid"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e496a50fda8aacccc86d7529e2c1e0892dbd0f898a6b5645b5561b89c3210efa"
+
+[[package]]
+name = "cpufeatures"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e4c1eaa2012c47becbbad2ab175484c2a84d1185b566fb2cc5b8707343dfe58"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "crate-git-revision"
+version = "0.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c521bf1f43d31ed2f73441775ed31935d77901cb3451e44b38a1c1612fcbaf98"
+dependencies = [
+ "serde",
+ "serde_derive",
+ "serde_json",
+]
+
+[[package]]
+name = "crypto-bigint"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
+dependencies = [
+ "generic-array",
+ "rand_core",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "crypto-common"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
+[[package]]
+name = "ctor"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1586fa608b1dab41f667475b4a41faec5ba680aee428bfa5de4ea520fdc6e901"
+dependencies = [
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "curve25519-dalek"
+version = "4.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e89b8c6a2e4b1f45971ad09761aafb85514a84744b67a95e32c3cc1352d1f65c"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "cxx"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f61f1b6389c3fe1c316bf8a4dccc90a38208354b330925bce1f74a6c4756eb93"
+dependencies = [
+ "cc",
+ "cxxbridge-flags",
+ "cxxbridge-macro",
+ "link-cplusplus",
+]
+
+[[package]]
+name = "cxx-build"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12cee708e8962df2aeb38f594aae5d827c022b6460ac71a7a3e2c3c2aae5a07b"
+dependencies = [
+ "cc",
+ "codespan-reporting",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "scratch",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "cxxbridge-flags"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7944172ae7e4068c533afbb984114a56c46e9ccddda550499caa222902c7f7bb"
+
+[[package]]
+name = "cxxbridge-macro"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2345488264226bf682893e25de0769f3360aac9957980ec49361b083ddaa5bc5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "darling"
+version = "0.20.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0558d22a7b463ed0241e993f76f09f30b126687447751a8638587b864e4b3944"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.20.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab8bfa2e259f8ee1ce5e97824a3c55ec4404a0d772ca7fa96bf19f0752a046eb"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.20.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "der"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56acb310e15652100da43d130af8d97b509e95af61aab1c5a7939ef24337ee17"
+dependencies = [
+ "const-oid",
+ "zeroize",
+]
+
+[[package]]
+name = "derive_arbitrary"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67e77553c4162a157adbf834ebae5b415acbecbeafc7a74b0e886657506a7611"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "digest"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+dependencies = [
+ "block-buffer",
+ "const-oid",
+ "crypto-common",
+ "subtle",
+]
+
+[[package]]
+name = "downcast-rs"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ea835d29036a4087793836fa931b08837ad5e957da9e23886b29586fb9b6650"
+
+[[package]]
+name = "ecdsa"
+version = "0.16.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
+dependencies = [
+ "der",
+ "digest",
+ "elliptic-curve",
+ "rfc6979",
+ "signature",
+]
+
+[[package]]
+name = "ed25519"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
+dependencies = [
+ "pkcs8",
+ "signature",
+]
+
+[[package]]
+name = "ed25519-dalek"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+dependencies = [
+ "curve25519-dalek",
+ "ed25519",
+ "rand_core",
+ "serde",
+ "sha2",
+ "zeroize",
+]
+
+[[package]]
+name = "either"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
+
+[[package]]
+name = "elliptic-curve"
+version = "0.13.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
+dependencies = [
+ "base16ct",
+ "crypto-bigint",
+ "digest",
+ "ff",
+ "generic-array",
+ "group",
+ "rand_core",
+ "sec1",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "equivalent"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
+
+[[package]]
+name = "escape-bytes"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bfcf67fea2815c2fc3b90873fae90957be12ff417335dfadc7f52927feb03b2"
+
+[[package]]
+name = "ethnum"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b90ca2580b73ab6a1f724b76ca11ab632df820fd6040c336200d2c1df7b3c82c"
+
+[[package]]
+name = "ff"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
+dependencies = [
+ "rand_core",
+ "subtle",
+]
+
+[[package]]
+name = "fiat-crypto"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27573eac26f4dd11e2b1916c3fe1baa56407c83c71a773a8ba17ec0bca03b6b7"
+
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
+[[package]]
+name = "generic-array"
+version = "0.14.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
+dependencies = [
+ "typenum",
+ "version_check",
+ "zeroize",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe9006bed769170c11f845cf00c7c1e9092aeb3f268e007c3e760ac68008070f"
+dependencies = [
+ "cfg-if",
+ "js-sys",
+ "libc",
+ "wasi",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "gimli"
+version = "0.28.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
+
+[[package]]
+name = "group"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
+dependencies = [
+ "ff",
+ "rand_core",
+ "subtle",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+
+[[package]]
+name = "hashbrown"
+version = "0.14.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
+
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "hex-literal"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fe2267d4ed49bc07b63801559be28c718ea06c4738b7a03c94df7386d2cde46"
+
+[[package]]
+name = "hmac"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
+dependencies = [
+ "digest",
+]
+
+[[package]]
+name = "iana-time-zone"
+version = "0.1.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0722cd7114b7de04316e7ea5456a0bbb20e4adb46fd27a3697adb812cff0f37c"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "windows",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0703ae284fc167426161c2e3f1da3ea71d94b21bedbcc9494e92b28e334e3dca"
+dependencies = [
+ "cxx",
+ "cxx-build",
+]
+
+[[package]]
+name = "ident_case"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
+
+[[package]]
+name = "indexmap"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
+dependencies = [
+ "autocfg",
+ "hashbrown 0.12.3",
+ "serde",
+]
+
+[[package]]
+name = "indexmap"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d530e1a18b1cb4c484e6e34556a0d948706958449fca0cab753d649f2bce3d1f"
+dependencies = [
+ "equivalent",
+ "hashbrown 0.14.3",
+ "serde",
+]
+
+[[package]]
+name = "indexmap-nostd"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
+
+[[package]]
+name = "itertools"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1c173a5686ce8bfa551b3563d0c2170bf24ca44da99c7ca4bfdab5418c3fe57"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "453ad9f582a441959e5f0d088b02ce04cfe8d51a8eaf077f12ac6d3e94164ca6"
+
+[[package]]
+name = "js-sys"
+version = "0.3.61"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "445dde2150c55e483f3d8416706b97ec8e8237c307e5b7b4b8dd15e6af2a0730"
+dependencies = [
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "k256"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cadb76004ed8e97623117f3df85b17aaa6626ab0b0831e6573f104df16cd1bcc"
+dependencies = [
+ "cfg-if",
+ "ecdsa",
+ "elliptic-curve",
+ "sha2",
+]
+
+[[package]]
+name = "keccak"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f6d5ed8676d904364de097082f4e7d240b571b67989ced0240f08b7f966f940"
+dependencies = [
+ "cpufeatures",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.150"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89d92a4743f9a61002fae18374ed11e7973f530cb3a3255fb354818118b2203c"
+
+[[package]]
+name = "libm"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "348108ab3fba42ec82ff6e9564fc4ca0247bdccdc68dd8af9764bbc79c3c8ffb"
+
+[[package]]
+name = "link-cplusplus"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecd207c9c713c34f95a097a5b029ac2ce6010530c7b49d7fea24d977dede04f5"
+dependencies = [
+ "cc",
+]
+
+[[package]]
+name = "log"
+version = "0.4.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "miniz_oxide"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7810e0be55b428ada41041c41f32c9f1a42817901b4ccf45fa3d4b6561e74c7"
+dependencies = [
+ "adler",
+]
+
+[[package]]
+name = "num-bigint"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-derive"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfb77679af88f8b125209d354a202862602672222e7f2313fdd6dc349bad4712"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "object"
+version = "0.32.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9cf5f9dd3933bd50a9e1f149ec995f39ae2c496d31fd772c1fd45ebc27e902b0"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.17.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+
+[[package]]
+name = "p256"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
+dependencies = [
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "sha2",
+]
+
+[[package]]
+name = "paste"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f746c4065a8fa3fe23974dd82f15431cc8d40779821001404d10d2e79ca7d79"
+
+[[package]]
+name = "pkcs8"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f950b2377845cebe5cf8b5165cb3cc1a5e0fa5cfa3e1f7f55707d8fd82e0a7b7"
+dependencies = [
+ "der",
+ "spki",
+]
+
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
+[[package]]
+name = "prettyplease"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ceca8aaf45b5c46ec7ed39fff75f57290368c1846d33d24a122ca81416ab058"
+dependencies = [
+ "proc-macro2",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "primeorder"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7dbe9ed3b56368bd99483eb32fe9c17fdd3730aebadc906918ce78d54c7eeb4"
+dependencies = [
+ "elliptic-curve",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "134c189feb4956b20f6f547d2cf727d4c0fe06722b20a0eec87ed445a97f92da"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "rfc6979"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8dd2a808d456c4a54e300a23e9f5a67e122c3024119acbfd73e3bf664491cb2"
+dependencies = [
+ "hmac",
+ "subtle",
+]
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
+
+[[package]]
+name = "rustc_version"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f91339c0467de62360649f8d3e185ca8de4224ff281f66000de5eb2a77a79041"
+
+[[package]]
+name = "scratch"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1792db035ce95be60c3f8853017b3999209281c24e2ba5bc8e59bf97a0c590c1"
+
+[[package]]
+name = "sec1"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0aec48e813d6b90b15f0b8948af3c63483992dee44c03e9930b3eebdabe046e"
+dependencies = [
+ "base16ct",
+ "der",
+ "generic-array",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "semver"
+version = "1.0.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bebd363326d05ec3e2f532ab7660680f3b02130d780c299bca73469d521bc0ed"
+
+[[package]]
+name = "serde"
+version = "1.0.192"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.192"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.108"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d1c7e3eac408d115102c4c24ad393e0821bb3a5df4d506a80f85f7a742a526b"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "serde_with"
+version = "3.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64cd236ccc1b7a29e7e2739f27c0b2dd199804abc4290e32f59f3b68d6405c23"
+dependencies = [
+ "base64 0.21.0",
+ "chrono",
+ "hex",
+ "indexmap 1.9.3",
+ "indexmap 2.1.0",
+ "serde",
+ "serde_json",
+ "serde_with_macros",
+ "time",
+]
+
+[[package]]
+name = "serde_with_macros"
+version = "3.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93634eb5f75a2323b16de4748022ac4297f9e76b6dced2be287a099f41b5e788"
+dependencies = [
+ "darling",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "sha2"
+version = "0.10.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
+[[package]]
+name = "sha3"
+version = "0.10.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
+dependencies = [
+ "digest",
+ "keccak",
+]
+
+[[package]]
+name = "signature"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
+dependencies = [
+ "digest",
+ "rand_core",
+]
+
+[[package]]
+name = "smallvec"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
+
+[[package]]
+name = "soroban-builtin-sdk-macros"
+version = "21.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c97a421cb20a81d14b0be51a20029fdf41ebbeaf46de57b77ee08c3d6bcdd344"
+dependencies = [
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "soroban-env-common"
+version = "21.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab3a317a07564da61640643ea4081027f41108fbac2f92eab4b4ea14f9131431"
+dependencies = [
+ "arbitrary",
+ "crate-git-revision",
+ "ethnum",
+ "num-derive",
+ "num-traits",
+ "serde",
+ "soroban-env-macros",
+ "soroban-wasmi",
+ "static_assertions",
+ "stellar-xdr",
+ "wasmparser",
+]
+
+[[package]]
+name = "soroban-env-guest"
+version = "21.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6177a425602416528b8acfea2b8192fc5f3a8724fdba2171a1f3d2de9a5aaf9"
+dependencies = [
+ "soroban-env-common",
+ "static_assertions",
+]
+
+[[package]]
+name = "soroban-env-host"
+version = "21.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67a8c79ea38779bc4d9338df4487b2c20c38e27d6970defca6258891a6b0d992"
+dependencies = [
+ "backtrace",
+ "curve25519-dalek",
+ "ecdsa",
+ "ed25519-dalek",
+ "elliptic-curve",
+ "generic-array",
+ "getrandom",
+ "hex-literal",
+ "hmac",
+ "k256",
+ "num-derive",
+ "num-integer",
+ "num-traits",
+ "p256",
+ "rand",
+ "rand_chacha",
+ "sec1",
+ "sha2",
+ "sha3",
+ "soroban-builtin-sdk-macros",
+ "soroban-env-common",
+ "soroban-wasmi",
+ "static_assertions",
+ "stellar-strkey",
+ "wasmparser",
+]
+
+[[package]]
+name = "soroban-env-macros"
+version = "21.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380279c38cb56d9204f6bf43168b07acebc9690ddf0676412f3b574b9ef37495"
+dependencies = [
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "serde",
+ "serde_json",
+ "stellar-xdr",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "soroban-ledger-snapshot"
+version = "21.0.1-preview.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1a233fb22f5554d512b93d9d0d715d14cc146386895274c28318ae40e58aaa0"
+dependencies = [
+ "serde",
+ "serde_json",
+ "serde_with",
+ "soroban-env-common",
+ "soroban-env-host",
+ "thiserror",
+]
+
+[[package]]
+name = "soroban-sdk"
+version = "21.0.1-preview.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0a0e0131e90932fd8db4347e85a701cb9c9622a1b8beaab7561519c358dd0f7"
+dependencies = [
+ "arbitrary",
+ "bytes-lit",
+ "ctor",
+ "ed25519-dalek",
+ "rand",
+ "serde",
+ "serde_json",
+ "soroban-env-guest",
+ "soroban-env-host",
+ "soroban-ledger-snapshot",
+ "soroban-sdk-macros",
+ "stellar-strkey",
+]
+
+[[package]]
+name = "soroban-sdk-macros"
+version = "21.0.1-preview.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05e4e11d419418bc9559d251c5a51f84998bdbd04ebcc9457f3cad52e2c8a66f"
+dependencies = [
+ "crate-git-revision",
+ "darling",
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "rustc_version",
+ "sha2",
+ "soroban-env-common",
+ "soroban-spec",
+ "soroban-spec-rust",
+ "stellar-xdr",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "soroban-spec"
+version = "21.0.1-preview.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a151ee71b5442921339bca2086b7788e92d689f2d889ccf3b83cf66872a2d33"
+dependencies = [
+ "base64 0.13.1",
+ "stellar-xdr",
+ "thiserror",
+ "wasmparser",
+]
+
+[[package]]
+name = "soroban-spec-rust"
+version = "21.0.1-preview.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb562f6e0c0dd41ab5faf67b2034557afb77031b73b6eb13199172956cd092bc"
+dependencies = [
+ "prettyplease",
+ "proc-macro2",
+ "quote",
+ "sha2",
+ "soroban-spec",
+ "stellar-xdr",
+ "syn 2.0.39",
+ "thiserror",
+]
+
+[[package]]
+name = "soroban-ttl-example"
+version = "0.0.0"
+dependencies = [
+ "soroban-sdk",
+]
+
+[[package]]
+name = "soroban-wasmi"
+version = "0.31.1-soroban.20.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "710403de32d0e0c35375518cb995d4fc056d0d48966f2e56ea471b8cb8fc9719"
+dependencies = [
+ "smallvec",
+ "spin",
+ "wasmi_arena",
+ "wasmi_core",
+ "wasmparser-nostd",
+]
+
+[[package]]
+name = "spin"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+
+[[package]]
+name = "spki"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d1e996ef02c474957d681f1b05213dfb0abab947b446a62d37770b23500184a"
+dependencies = [
+ "base64ct",
+ "der",
+]
+
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
+[[package]]
+name = "stellar-strkey"
+version = "0.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12d2bf45e114117ea91d820a846fd1afbe3ba7d717988fee094ce8227a3bf8bd"
+dependencies = [
+ "base32",
+ "crate-git-revision",
+ "thiserror",
+]
+
+[[package]]
+name = "stellar-xdr"
+version = "21.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88e716110d5e050e528820217f84d4667e166ced841ba48d074152d4ad4ab884"
+dependencies = [
+ "arbitrary",
+ "base64 0.13.1",
+ "crate-git-revision",
+ "escape-bytes",
+ "hex",
+ "serde",
+ "serde_with",
+ "stellar-strkey",
+]
+
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
+[[package]]
+name = "subtle"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.39"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23e78b90f2fcf45d3e842032ce32e3f2d1545ba6636271dcbf24fa306d87be7a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "termcolor"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be55cf8942feac5c765c2c993422806843c9a9a45d4d5c407ad6dd2ea95eb9b6"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "978c9a314bd8dc99be594bc3c175faaa9794be04a5a5e153caba6915336cebac"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.39",
+]
+
+[[package]]
+name = "time"
+version = "0.3.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd0cbfecb4d19b5ea75bb31ad904eb5b9fa13f21079c3b92017ebdf4999a5890"
+dependencies = [
+ "itoa",
+ "serde",
+ "time-core",
+ "time-macros",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e153e1f1acaef8acc537e68b44906d2db6436e2b35ac2c6b42640fff91f00fd"
+
+[[package]]
+name = "time-macros"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd80a657e71da814b8e5d60d3374fc6d35045062245d80224748ae522dd76f36"
+dependencies = [
+ "time-core",
+]
+
+[[package]]
+name = "typenum"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+
+[[package]]
+name = "unicode-width"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.84"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31f8dcbc21f30d9b8f2ea926ecb58f6b91192c17e9d33594b3df58b2007ca53b"
+dependencies = [
+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.84"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95ce90fd5bcc06af55a641a86428ee4229e44e07033963a2290a8e241607ccb9"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.84"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c21f77c0bedc37fd5dc21f897894a5ca01e7bb159884559461862ae90c0b4c5"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.84"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2aff81306fcac3c7515ad4e177f521b5c9a15f2b08f4e32d823066102f35a5f6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.84"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0046fef7e28c3804e5e38bfa31ea2a0f73905319b677e57ebe37e49358989b5d"
+
+[[package]]
+name = "wasmi_arena"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
+
+[[package]]
+name = "wasmi_core"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
+dependencies = [
+ "downcast-rs",
+ "libm",
+ "num-traits",
+ "paste",
+]
+
+[[package]]
+name = "wasmparser"
+version = "0.116.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a58e28b80dd8340cb07b8242ae654756161f6fc8d0038123d679b7b99964fa50"
+dependencies = [
+ "indexmap 2.1.0",
+ "semver",
+]
+
+[[package]]
+name = "wasmparser-nostd"
+version = "0.100.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9157cab83003221bfd385833ab587a039f5d6fa7304854042ba358a3b09e0724"
+dependencies = [
+ "indexmap-nostd",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b1eb6f0cd7c80c79759c929114ef071b87354ce476d9d94271031c0497adfd5"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
+[[package]]
+name = "zeroize"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
diff --git a/ttl/Cargo.toml b/ttl/Cargo.toml
new file mode 100644
index 00000000..296139c7
--- /dev/null
+++ b/ttl/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "soroban-ttl-example"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+doctest = false
+
+[dependencies]
+soroban-sdk = { version = "21.0.1-preview.3" }
+
+[dev-dependencies]
+soroban-sdk = { version = "21.0.1-preview.3", features = ["testutils"] }
+
+[profile.release]
+opt-level = "z"
+overflow-checks = true
+debug = 0
+strip = "symbols"
+debug-assertions = false
+panic = "abort"
+codegen-units = 1
+lto = true
+
+[profile.release-with-logs]
+inherits = "release"
+debug-assertions = true
diff --git a/ttl/Makefile b/ttl/Makefile
new file mode 100644
index 00000000..71ad4a6c
--- /dev/null
+++ b/ttl/Makefile
@@ -0,0 +1,16 @@
+default: build
+
+all: test
+
+test: build
+	cargo test
+
+build:
+	soroban contract build
+	@ls -l target/wasm32-unknown-unknown/release/*.wasm
+
+fmt:
+	cargo fmt --all
+
+clean:
+	cargo clean
diff --git a/ttl/src/lib.rs b/ttl/src/lib.rs
new file mode 100644
index 00000000..4d1269b8
--- /dev/null
+++ b/ttl/src/lib.rs
@@ -0,0 +1,47 @@
+#![no_std]
+/// This is a simple contract that just extends TTL for its keys.
+/// It's main purpose is to demonstrate how TTL extension can be tested,
+/// so the most interesting part here is `test.rs`.
+use soroban_sdk::{contract, contractimpl, contracttype, Env};
+
+#[contracttype]
+pub enum DataKey {
+    MyKey,
+}
+
+#[contract]
+pub struct TtlContract;
+
+#[contractimpl]
+impl TtlContract {
+    /// Creates a contract entry in every kind of storage.
+    pub fn setup(env: Env) {
+        env.storage().persistent().set(&DataKey::MyKey, &0);
+        env.storage().instance().set(&DataKey::MyKey, &1);
+        env.storage().temporary().set(&DataKey::MyKey, &2);
+    }
+
+    /// Extend the persistent entry TTL to 5000 ledgers, when its
+    /// TTL is smaller than 1000 ledgers.
+    pub fn extend_persistent(env: Env) {
+        env.storage()
+            .persistent()
+            .extend_ttl(&DataKey::MyKey, 1000, 5000);
+    }
+
+    /// Extend the instance entry TTL to become at least 10000 ledgers,
+    /// when its TTL is smaller than 2000 ledgers.
+    pub fn extend_instance(env: Env) {
+        env.storage().instance().extend_ttl(2000, 10000);
+    }
+
+    /// Extend the temporary entry TTL to become at least 7000 ledgers,
+    /// when its TTL is smaller than 1000 ledgers.
+    pub fn extend_temporary(env: Env) {
+        env.storage()
+            .temporary()
+            .extend_ttl(&DataKey::MyKey, 3000, 7000);
+    }
+}
+
+mod test;
diff --git a/ttl/src/test.rs b/ttl/src/test.rs
new file mode 100644
index 00000000..70935d81
--- /dev/null
+++ b/ttl/src/test.rs
@@ -0,0 +1,152 @@
+#![cfg(test)]
+
+use super::{DataKey, TtlContract, TtlContractClient};
+use soroban_sdk::testutils::storage::{Instance, Persistent, Temporary};
+use soroban_sdk::testutils::Ledger;
+use soroban_sdk::Env;
+
+extern crate std;
+
+/// Create an environment with specific values of network settings.
+fn create_env() -> Env {
+    let env = Env::default();
+    env.ledger().with_mut(|li| {
+        // Current ledger sequence - the TTL is the number of
+        // ledgers from the `sequence_number` (exclusive) until
+        // the last ledger sequence where entry is still considered
+        // alive.
+        li.sequence_number = 100_000;
+        // Minimum TTL for persistent entries - new persistent (and instance)
+        // entries will have this TTL when created.
+        li.min_persistent_entry_ttl = 500;
+        // Minimum TTL for temporary entries - new persistent (and instance)
+        // entries will have this TTL when created.
+        li.min_temp_entry_ttl = 100;
+        // Maximum TTL of any entry. Note, that entries can have their TTL
+        // extended indefinitely, but each extension can be at most
+        // `max_entry_ttl` ledger from the current `sequence_number`.
+        li.max_entry_ttl = 15000;
+    });
+    env
+}
+
+// This test covers the general behavior of TTL extensions via `get_ttl`
+// test utility.
+// Using `get_ttl` is the recommended way to ensure that the TTL has
+// been extended to the expected value.
+#[test]
+fn test_extend_ttl_behavior() {
+    let env = create_env();
+    let contract_id = env.register_contract(None, TtlContract);
+    let client = TtlContractClient::new(&env, &contract_id);
+
+    // Create initial entries and make sure their TTLs correspond to
+    // `min_persistent_entry_ttl` and `min_temp_entry_ttl` values set in
+    // `create_env()`.
+    client.setup();
+    env.as_contract(&contract_id, || {
+        // Note, that TTL doesn't include the current ledger, but when entry
+        // is created the current ledger is counted towards the number of
+        // ledgers specified by `min_persistent/temp_entry_ttl`, thus
+        // the TTL is 1 ledger less than the respective setting.
+        assert_eq!(env.storage().persistent().get_ttl(&DataKey::MyKey), 499);
+        assert_eq!(env.storage().instance().get_ttl(), 499);
+        assert_eq!(env.storage().temporary().get_ttl(&DataKey::MyKey), 99);
+    });
+
+    // Extend persistent entry TTL to 5000 ledgers - now it is 5000.
+    client.extend_persistent();
+    env.as_contract(&contract_id, || {
+        assert_eq!(env.storage().persistent().get_ttl(&DataKey::MyKey), 5000);
+    });
+
+    // Extend instance TTL to 10000 ledgers - now it is 10000.
+    client.extend_instance();
+    env.as_contract(&contract_id, || {
+        assert_eq!(env.storage().instance().get_ttl(), 10000);
+    });
+
+    // Extend temporary entry TTL to 7000 ledgers - now it is 7000.
+    client.extend_temporary();
+    env.as_contract(&contract_id, || {
+        assert_eq!(env.storage().temporary().get_ttl(&DataKey::MyKey), 7000);
+    });
+
+    // Now bump the ledger sequence by 5000 in order to sanity-check
+    // the threshold settings of `extend_ttl` operations.
+    env.ledger().with_mut(|li| {
+        li.sequence_number = 100_000 + 5_000;
+    });
+    // Now the TTL of every entry has been reduced by 5000 ledgers.
+    env.as_contract(&contract_id, || {
+        assert_eq!(env.storage().persistent().get_ttl(&DataKey::MyKey), 0);
+        assert_eq!(env.storage().instance().get_ttl(), 5000);
+        assert_eq!(env.storage().temporary().get_ttl(&DataKey::MyKey), 2000);
+    });
+    // Extend TTL of all the entries.
+    client.extend_persistent();
+    client.extend_instance();
+    client.extend_temporary();
+    env.as_contract(&contract_id, || {
+        assert_eq!(env.storage().persistent().get_ttl(&DataKey::MyKey), 5000);
+        // Instance TTL hasn't been increased because the remaining TTL
+        // (5000 ledgers) is larger than the threshold used by
+        // `extend_instance` (2000 ledgers)
+        assert_eq!(env.storage().instance().get_ttl(), 5000);
+        assert_eq!(env.storage().temporary().get_ttl(&DataKey::MyKey), 7000);
+    });
+}
+
+// This test demonstrates that temporary entries are considered to be removed
+// after their TTL expires.
+// It is not the recommended way to test `extend_ttl` (use `get_ttl` instead).
+// This behavior is mostly useful to catch bugs (such as missing/invalid TTL
+// extensions).
+// Note, that while test environment emulates the entry expiration logic, in
+// the real environment anyone can extend the TTL of any entry, so you should
+// never rely on the entries to be automatically removed. Temporary storage
+// is just a cost optimization, time boundaries still have to be managed by
+// the contract logic, as they are in e.g. token example
+// (https://github.com/stellar/soroban-examples/blob/002edecda8da85d71f7fdc000eeed924c5a71cbd/token/src/allowance.rs#L7)
+#[test]
+fn test_temp_entry_removal() {
+    let env = create_env();
+    let contract_id = env.register_contract(None, TtlContract);
+    let client = TtlContractClient::new(&env, &contract_id);
+    client.setup();
+    // Extend the contract instance to live more than 7001 ledgers.
+    client.extend_instance();
+    // Extend the temporary entry TTL to 7000 ledgers.
+    client.extend_temporary();
+    // Bump the ledger sequence by 7001 ledgers (one ledger past TTL).
+    env.ledger().with_mut(|li| {
+        li.sequence_number = 100_000 + 7001;
+    });
+    // Now the entry is no longer present in the environment.
+    env.as_contract(&contract_id, || {
+        assert_eq!(env.storage().temporary().has(&DataKey::MyKey), false);
+    });
+}
+
+// This test demonstrates that persistent entries are considered to be 'archived'
+// after their TTL expires and thus the execution immediately halts with a panic.
+// It is not the recommended way to test `extend_ttl` (use `get_ttl` instead).
+// This behavior is mostly useful to catch bugs (such as missing/invalid TTL
+// extensions).
+#[test]
+#[should_panic(expected = "[testing-only] Accessed contract instance key that has been archived.")]
+fn test_persistent_entry_archival() {
+    let env = create_env();
+    let contract_id = env.register_contract(None, TtlContract);
+    let client = TtlContractClient::new(&env, &contract_id);
+    client.setup();
+    // Extend the instance TTL to 10000 ledgers.
+    client.extend_instance();
+    // Bump the ledger sequence by 10001 ledgers (one ledger past TTL).
+    env.ledger().with_mut(|li| {
+        li.sequence_number = 100_000 + 10_001;
+    });
+    // Now any call involving the expired contract (such as `extend_instance`
+    // call here) will panic as soon as that contract is accessed.
+    client.extend_instance();
+}

From 117e07410f8e58f72f03f5ff3d5f424297aa1f5a Mon Sep 17 00:00:00 2001
From: Dmytro Kozhevin <dmytro@stellar.org>
Date: Tue, 28 May 2024 14:07:52 -0400
Subject: [PATCH 2/3] Update ttl/src/lib.rs

Co-authored-by: Siddharth Suresh <siddharth@stellar.org>
---
 ttl/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ttl/src/lib.rs b/ttl/src/lib.rs
index 4d1269b8..84212018 100644
--- a/ttl/src/lib.rs
+++ b/ttl/src/lib.rs
@@ -36,7 +36,7 @@ impl TtlContract {
     }
 
     /// Extend the temporary entry TTL to become at least 7000 ledgers,
-    /// when its TTL is smaller than 1000 ledgers.
+    /// when its TTL is smaller than 3000 ledgers.
     pub fn extend_temporary(env: Env) {
         env.storage()
             .temporary()

From 1284d8d6034034583efd8ac64790a7b32109c76d Mon Sep 17 00:00:00 2001
From: Dmytro Kozhevin <dmytro@stellar.org>
Date: Tue, 28 May 2024 14:09:07 -0400
Subject: [PATCH 3/3] Update ttl/src/test.rs

Co-authored-by: Siddharth Suresh <siddharth@stellar.org>
---
 ttl/src/test.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ttl/src/test.rs b/ttl/src/test.rs
index 70935d81..2012dda8 100644
--- a/ttl/src/test.rs
+++ b/ttl/src/test.rs
@@ -19,7 +19,7 @@ fn create_env() -> Env {
         // Minimum TTL for persistent entries - new persistent (and instance)
         // entries will have this TTL when created.
         li.min_persistent_entry_ttl = 500;
-        // Minimum TTL for temporary entries - new persistent (and instance)
+        // Minimum TTL for temporary entries - new temporary
         // entries will have this TTL when created.
         li.min_temp_entry_ttl = 100;
         // Maximum TTL of any entry. Note, that entries can have their TTL