diff --git a/Cargo.lock b/Cargo.lock
index da9b626..1d6dfd8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,10 +3,37 @@
 version = 4
 
 [[package]]
-name = "anyhow"
-version = "1.0.102"
+name = "addr2line"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
+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 = "atomic-waker"
@@ -14,30 +41,111 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
 
+[[package]]
+name = "autocfg"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
+
+[[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 = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
+[[package]]
+name = "base64ct"
+version = "1.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2af50177e190e07a26ab74f8b1efbfe2ef87da2116221318cb1c2e82baf7de06"
+
 [[package]]
 name = "bitflags"
 version = "2.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "843867be96c8daad0d758b57df9392b6d8d271134fce549de6ce169ff98a92af"
 
+[[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 = "3.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5d20789868f4b01b2f2caec9f5c4e0213b41e3e5702a50157d699ae31ced2fcb"
 
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "bytes"
 version = "1.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
 
+[[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",
+]
+
+[[package]]
+name = "campaign-contract"
+version = "0.1.0"
+dependencies = [
+ "ed25519-dalek",
+ "soroban-sdk",
+ "stellar-strkey",
+]
+
 [[package]]
 name = "cc"
 version = "1.2.56"
@@ -54,13 +162,55 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "chrono"
+version = "0.4.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c673075a2e0e5f4a1dde27ce9dee1ea4558c7ffe648f576438a20ca1d2acc4b0"
+dependencies = [
+ "iana-time-zone",
+ "num-traits",
+ "serde",
+ "windows-link",
+]
+
+[[package]]
+name = "const-oid"
+version = "0.9.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
+
 [[package]]
 name = "contract-fox"
 version = "0.1.0"
 dependencies = [
+ "ed25519-dalek",
+ "reqwest",
+ "serde",
+ "serde_json",
+ "stellar-strkey",
+ "thiserror",
+ "tokio",
+]
+
+[[package]]
+name = "contract-fox-sdk"
+version = "0.1.0"
+dependencies = [
+ "ed25519-dalek",
+ "soroban-sdk",
+ "stellar-strkey",
+]
+
+[[package]]
+name = "contract-fox-worker"
+version = "0.1.0"
+dependencies = [
+ "ed25519-dalek",
  "reqwest",
  "serde",
  "serde_json",
+ "stellar-strkey",
  "thiserror",
  "tokio",
 ]
@@ -91,6 +241,164 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "cpufeatures"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59ed5838eebb26a2bb2e58f6d5b5316989ae9d08bab10e0e6d103e656d1b0280"
+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 = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
+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 = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a2785755761f3ddc1492979ce1e48d2c00d09311c39e4466429188f3dd6501"
+dependencies = [
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "curve25519-dalek"
+version = "4.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0a677b8922c94e01bdbb12126b0bc852f00447528dee1782229af9c720c3f348"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "darling"
+version = "0.20.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f63b86c8a8826a49b8c21f08a2d07338eec8d900540f8630dc76284be802989"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.20.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95133861a8032aaea082871032f5815eb9e98cef03fa916ab4500513994df9e5"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.20.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d336a2a514f6ccccaa3e09b02d41d35330c07ddf03a62165fcec10bb561c7806"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "der"
+version = "0.7.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7c1832837b905bbfb5101e07cc24c8deddf52f93225eee6ead5f4d63d53ddcb"
+dependencies = [
+ "const-oid",
+ "zeroize",
+]
+
+[[package]]
+name = "deranged"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d630bccd429a5bb5a64b5e94f693bfc48c9f8566418fda4c494cc94f911f87cc"
+dependencies = [
+ "powerfmt",
+ "serde",
+]
+
+[[package]]
+name = "derive_arbitrary"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e567bd82dcff979e4b03460c307b3cdc9e96fde3d73bed1496d2bc75d9dd62a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[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 = "displaydoc"
 version = "0.2.5"
@@ -102,6 +410,84 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "donation-contract"
+version = "0.1.0"
+dependencies = [
+ "ed25519-dalek",
+ "soroban-sdk",
+ "stellar-strkey",
+]
+
+[[package]]
+name = "downcast-rs"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75b325c5dbd37f80359721ad39aca5a29fb04c89279657cffdda8736d0c0b9d2"
+
+[[package]]
+name = "ecdsa"
+version = "0.16.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee27f32b5c5292967d2d4a9d7f1e0b0aed2c15daded5a60300e4abb9d8020bca"
+dependencies = [
+ "der",
+ "digest",
+ "elliptic-curve",
+ "rfc6979",
+ "signature",
+ "spki",
+]
+
+[[package]]
+name = "ed25519"
+version = "2.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "115531babc129696a58c64a4fef0a8bf9e9698629fb97e9e40767d235cfbcd53"
+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 = "1.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
+
+[[package]]
+name = "elliptic-curve"
+version = "0.13.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
+dependencies = [
+ "base16ct",
+ "crypto-bigint",
+ "digest",
+ "ff",
+ "generic-array",
+ "group",
+ "pkcs8",
+ "rand_core",
+ "sec1",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.35"
@@ -127,12 +513,40 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[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 = "fastrand"
 version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
 
+[[package]]
+name = "ff"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0b50bfb653653f9ca9095b427bed08ab8d75a137839d9ad64eb11810d5b6393"
+dependencies = [
+ "rand_core",
+ "subtle",
+]
+
+[[package]]
+name = "fiat-crypto"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28dea519a9695b9977216879a3ebfddf92f1c08c05d984f8996aecd6ecdc811d"
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.9"
@@ -145,12 +559,6 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
-[[package]]
-name = "foldhash"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
-
 [[package]]
 name = "foreign-types"
 version = "0.3.2"
@@ -224,32 +632,61 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.14.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bb6743198531e02858aeaea5398fcc883e71851fcbcb5a2f773e2fb6cb1edf2"
+dependencies = [
+ "typenum",
+ "version_check",
+ "zeroize",
+]
+
 [[package]]
 name = "getrandom"
-version = "0.2.17"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff2abc00be7fca6ebc474524697ae276ad847ad0a6b3faa4bcb027e9a4614ad0"
+checksum = "fe9006bed769170c11f845cf00c7c1e9092aeb3f268e007c3e760ac68008070f"
 dependencies = [
  "cfg-if",
+ "js-sys",
  "libc",
  "wasi",
+ "wasm-bindgen",
 ]
 
 [[package]]
 name = "getrandom"
-version = "0.4.1"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "139ef39800118c7683f2fd3c98c1b23c09ae076556b435f8e9064ae108aaeeec"
+checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
 dependencies = [
  "cfg-if",
  "libc",
  "r-efi",
  "wasip2",
- "wasip3",
 ]
 
 [[package]]
-name = "h2"
+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 = "h2"
 version = "0.4.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2f44da3a8150a6703ed5d34e164b875fd14c2cdab9af1252a9a1020bde2bdc54"
@@ -260,33 +697,48 @@ dependencies = [
  "futures-core",
  "futures-sink",
  "http",
- "indexmap",
+ "indexmap 2.11.1",
  "slab",
  "tokio",
  "tokio-util",
  "tracing",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+
 [[package]]
 name = "hashbrown"
 version = "0.15.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
+
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 dependencies = [
- "foldhash",
+ "serde",
 ]
 
 [[package]]
-name = "hashbrown"
-version = "0.16.1"
+name = "hex-literal"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
+checksum = "6fe2267d4ed49bc07b63801559be28c718ea06c4738b7a03c94df7386d2cde46"
 
 [[package]]
-name = "heck"
-version = "0.5.0"
+name = "hmac"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
+dependencies = [
+ "digest",
+]
 
 [[package]]
 name = "http"
@@ -387,7 +839,7 @@ version = "0.1.20"
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 checksum = "96547c2556ec9d12fb1578c4eaf448b04993e7fb79cbaad930a656880a6bdfa0"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "bytes",
  "futures-channel",
  "futures-util",
@@ -406,6 +858,30 @@ dependencies = [
  "windows-registry",
 ]
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e31bc9ad994ba00e440a8aa5c9ef0ec67d5cb5e5cb0cc7f8b744a35b389cc470"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
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 version = "2.1.1"
@@ -488,10 +964,10 @@ dependencies = [
 ]
 
 [[package]]
-name = "id-arena"
-version = "2.3.0"
+name = "ident_case"
+version = "1.0.1"
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-checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
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@@ -516,16 +992,32 @@ dependencies = [
 
 [[package]]
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-version = "2.13.0"
+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 = "2.11.1"
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-checksum = "7714e70437a7dc3ac8eb7e6f8df75fd8eb422675fc7678aff7364301092b1017"
+checksum = "206a8042aec68fa4a62e8d3f7aa4ceb508177d9324faf261e1959e495b7a1921"
 dependencies = [
  "equivalent",
- "hashbrown 0.16.1",
+ "hashbrown 0.15.5",
  "serde",
- "serde_core",
 ]
 
+[[package]]
+name = "indexmap-nostd"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
+
 [[package]]
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 version = "2.11.0"
@@ -542,6 +1034,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
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+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1c173a5686ce8bfa551b3563d0c2170bf24ca44da99c7ca4bfdab5418c3fe57"
+dependencies = [
+ "either",
+]
+
 [[package]]
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@@ -559,10 +1060,27 @@ dependencies = [
 ]
 
 [[package]]
-name = "leb128fmt"
-version = "0.1.0"
+name = "k256"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cadb76004ed8e97623117f3df85b17aaa6626ab0b0831e6573f104df16cd1bcc"
+dependencies = [
+ "cfg-if",
+ "ecdsa",
+ "elliptic-curve",
+ "once_cell",
+ "sha2",
+ "signature",
+]
+
+[[package]]
+name = "keccak"
+version = "0.1.6"
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-checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
+checksum = "cb26cec98cce3a3d96cbb7bced3c4b16e3d13f27ec56dbd62cbc8f39cfb9d653"
+dependencies = [
+ "cpufeatures",
+]
 
 [[package]]
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@@ -570,6 +1088,12 @@ version = "0.2.182"
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 checksum = "6800badb6cb2082ffd7b6a67e6125bb39f18782f793520caee8cb8846be06112"
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6d2cec3eae94f9f509c767b45932f1ada8350c4bdb85af2fcab4a3c14807981"
+
 [[package]]
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@@ -600,6 +1124,15 @@ version = "0.3.17"
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 checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
 
+[[package]]
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+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8a240ddb74feaf34a79a7add65a741f3167852fba007066dcac1ca548d89c08"
+dependencies = [
+ "adler",
+]
+
 [[package]]
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@@ -628,6 +1161,62 @@ dependencies = [
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 ]
 
+[[package]]
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+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "608e7659b5c3d7cba262d894801b9ec9d00de989e8a82bd4bef91d08da45cdc0"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
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+checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
+
+[[package]]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
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+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
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+checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
+dependencies = [
+ "autocfg",
+]
+
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+checksum = "a6a622008b6e321afc04970976f62ee297fdbaa6f95318ca343e3eebb9648441"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
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@@ -678,6 +1267,12 @@ dependencies = [
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+[[package]]
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+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
+
 [[package]]
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@@ -696,12 +1291,28 @@ version = "0.1.0"
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 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f950b2377845cebe5cf8b5165cb3cc1a5e0fa5cfa3e1f7f55707d8fd82e0a7b7"
+dependencies = [
+ "der",
+ "spki",
+]
+
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+
 [[package]]
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@@ -711,11 +1322,26 @@ dependencies = [
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 ]
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
+
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+checksum = "77957b295656769bb8ad2b6a6b09d897d94f05c41b069aede1fcdaa675eaea04"
+dependencies = [
+ "zerocopy",
+]
+
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@@ -723,18 +1349,18 @@ dependencies = [
 
 [[package]]
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+checksum = "134c189feb4956b20f6f547d2cf727d4c0fe06722b20a0eec87ed445a97f92da"
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+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
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+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
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+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
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+dependencies = [
+ "getrandom 0.2.11",
+]
+
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 checksum = "eddd3ca559203180a307f12d114c268abf583f59b03cb906fd0b3ff8646c1147"
 dependencies = [
- "base64",
+ "base64 0.22.1",
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@@ -787,6 +1443,16 @@ dependencies = [
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+dependencies = [
+ "hmac",
+ "subtle",
+]
+
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@@ -795,12 +1461,27 @@ checksum = "a4689e6c2294d81e88dc6261c768b63bc4fcdb852be6d1352498b114f61383b7"
 dependencies = [
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- "getrandom 0.2.17",
+ "getrandom 0.2.11",
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+dependencies = [
+ "semver",
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+
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@@ -815,176 +1496,471 @@ dependencies = [
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+ "soroban-env-guest",
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 dependencies = [
- "libc",
- "windows-sys 0.60.2",
+ "arbitrary",
+ "base64 0.13.1",
+ "crate-git-revision",
+ "escape-bytes",
+ "hex",
+ "serde",
+ "serde_with",
+ "stellar-strkey",
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 [[package]]
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+checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
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@@ -994,9 +1970,9 @@ checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
 [[package]]
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-checksum = "e665b8803e7b1d2a727f4023456bbbbe74da67099c585258af0ad9c5013b9b99"
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@@ -1051,7 +2027,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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- "getrandom 0.4.1",
+ "getrandom 0.3.4",
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  "windows-sys 0.61.2",
@@ -1059,24 +2035,55 @@ dependencies = [
 
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+checksum = "6e3de26b0965292219b4287ff031fcba86837900fe9cd2b34ea8ad893c0953d2"
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 [[package]]
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-checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
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 dependencies = [
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  "quote",
  "syn",
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+[[package]]
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+checksum = "91e7d9e3bb61134e77bde20dd4825b97c010155709965fedf0f49bb138e52a9d"
+dependencies = [
+ "deranged",
+ "itoa",
+ "num-conv",
+ "powerfmt",
+ "serde",
+ "time-core",
+ "time-macros",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40868e7c1d2f0b8d73e4a8c7f0ff63af4f6d19be117e90bd73eb1d62cf831c6b"
+
+[[package]]
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+checksum = "30cfb0125f12d9c277f35663a0a33f8c30190f4e4574868a330595412d34ebf3"
+dependencies = [
+ "num-conv",
+ "time-core",
+]
+
 [[package]]
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@@ -1217,16 +2224,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
 [[package]]
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+name = "typenum"
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-checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
+checksum = "562d481066bde0658276a35467c4af00bdc6ee726305698a55b86e61d7ad82bb"
 
 [[package]]
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+checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
 
 [[package]]
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@@ -1258,6 +2265,12 @@ version = "0.2.15"
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 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
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@@ -1282,15 +2295,6 @@ dependencies = [
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-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "wit-bindgen",
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-
 [[package]]
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 version = "0.2.114"
@@ -1351,37 +2355,39 @@ dependencies = [
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 [[package]]
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+name = "wasmi_arena"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "104a7f73be44570cac297b3035d76b169d6599637631cf37a1703326a0727073"
+
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-checksum = "990065f2fe63003fe337b932cfb5e3b80e0b4d0f5ff650e6985b1048f62c8319"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
- "leb128fmt",
- "wasmparser",
+ "downcast-rs",
+ "libm",
+ "num-traits",
+ "paste",
 ]
 
 [[package]]
-name = "wasm-metadata"
-version = "0.244.0"
+name = "wasmparser"
+version = "0.88.0"
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-checksum = "bb0e353e6a2fbdc176932bbaab493762eb1255a7900fe0fea1a2f96c296cc909"
+checksum = "fb8cf7dd82407fe68161bedcd57fde15596f32ebf6e9b3bdbf3ae1da20e38e5e"
 dependencies = [
- "anyhow",
- "indexmap",
- "wasm-encoder",
- "wasmparser",
+ "indexmap 1.9.3",
 ]
 
 [[package]]
-name = "wasmparser"
-version = "0.244.0"
+name = "wasmparser-nostd"
+version = "0.100.2"
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-checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
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 dependencies = [
- "bitflags",
- "hashbrown 0.15.5",
- "indexmap",
- "semver",
+ "indexmap-nostd",
 ]
 
 [[package]]
@@ -1394,6 +2400,41 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
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+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
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+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
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+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
@@ -1590,87 +2631,14 @@ name = "wit-bindgen"
 version = "0.51.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5"
-dependencies = [
- "wit-bindgen-rust-macro",
-]
-
-[[package]]
-name = "wit-bindgen-core"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea61de684c3ea68cb082b7a88508a8b27fcc8b797d738bfc99a82facf1d752dc"
-dependencies = [
- "anyhow",
- "heck",
- "wit-parser",
-]
-
-[[package]]
-name = "wit-bindgen-rust"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7c566e0f4b284dd6561c786d9cb0142da491f46a9fbed79ea69cdad5db17f21"
-dependencies = [
- "anyhow",
- "heck",
- "indexmap",
- "prettyplease",
- "syn",
- "wasm-metadata",
- "wit-bindgen-core",
- "wit-component",
-]
-
-[[package]]
-name = "wit-bindgen-rust-macro"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c0f9bfd77e6a48eccf51359e3ae77140a7f50b1e2ebfe62422d8afdaffab17a"
-dependencies = [
- "anyhow",
- "prettyplease",
- "proc-macro2",
- "quote",
- "syn",
- "wit-bindgen-core",
- "wit-bindgen-rust",
-]
-
-[[package]]
-name = "wit-component"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
-dependencies = [
- "anyhow",
- "bitflags",
- "indexmap",
- "log",
- "serde",
- "serde_derive",
- "serde_json",
- "wasm-encoder",
- "wasm-metadata",
- "wasmparser",
- "wit-parser",
-]
 
 [[package]]
-name = "wit-parser"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecc8ac4bc1dc3381b7f59c34f00b67e18f910c2c0f50015669dde7def656a736"
+name = "withdrawal-contract"
+version = "0.1.0"
 dependencies = [
- "anyhow",
- "id-arena",
- "indexmap",
- "log",
- "semver",
- "serde",
- "serde_derive",
- "serde_json",
- "unicode-xid",
- "wasmparser",
+ "ed25519-dalek",
+ "soroban-sdk",
+ "stellar-strkey",
 ]
 
 [[package]]
@@ -1702,6 +2670,27 @@ dependencies = [
  "synstructure",
 ]
 
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "byteorder",
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "zerofrom"
 version = "0.1.6"
@@ -1761,9 +2750,3 @@ dependencies = [
  "quote",
  "syn",
 ]
-
-[[package]]
-name = "zmij"
-version = "1.0.21"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
diff --git a/Cargo.toml b/Cargo.toml
index 9a67999..ef72894 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,16 @@
+[workspace]
+members = [
+    "contracts/donation",
+    "contracts/withdrawal",
+    "contracts/campaign",
+    "sdk",
+    "worker",
+]
+
+[workspace.profile.release]
+opt-level = "z"
+lto = true
+
 [package]
 name = "contract-fox"
 version = "0.1.0"
diff --git a/Makefile b/Makefile
index b967bfc..597348a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,52 +1,76 @@
-### Makefile for Stellar / Soroban contract development
+### Makefile for Contract Fox - Soroban Smart Contracts
 # Usage:
-#   make build           # build workspace
-#   make wasm            # build contract WASM (package: $(CONTRACT_PKG))
-#   make deploy          # deploy WASM using soroban CLI (requires `soroban`)
-#   make fund ADDR=G...  # fund an address on testnet using Friendbot (curl)
-#   make invoke FUNC=ping # invoke a function on deployed contract (requires CONTRACT_ID)
-#   make test            # run cargo test
-#   make fmt             # run cargo fmt
-#   make lint            # run cargo clippy (strict)
-#   make clean           # cargo clean
+#   make build              # build entire workspace
+#   make build-contracts    # build all contract WASMs
+#   make test               # run all tests
+#   make deploy-testnet     # deploy contracts to testnet
+#   make deploy-mainnet     # deploy contracts to mainnet
+#   make fmt                # format code
+#   make lint               # lint code with clippy
+#   make clean              # clean build artifacts
 
 # --- Configuration ---
-CONTRACT_PKG ?= stellaraid-core
 WASM_TARGET ?= wasm32-unknown-unknown
 RELEASE_FLAG ?= --release
 NETWORK ?= testnet
-WASM_FILE ?= target/$(WASM_TARGET)/release/$(CONTRACT_PKG).wasm
-CONTRACT_ID_FILE ?= .contract_id
+CONTRACTS = donation-contract withdrawal-contract campaign-contract
 
-.PHONY: all help build wasm deploy fund invoke test fmt lint clean
+.PHONY: all help build build-contracts test deploy-testnet deploy-mainnet fmt lint clean
 
 all: build
 
 help:
-	@echo "Makefile targets:"
-	@echo "  build           Build the entire workspace"
-	@echo "  wasm            Build contract WASM for $(CONTRACT_PKG)"
-	@echo "  deploy          Deploy $(WASM_FILE) to $(NETWORK) via soroban"
-	@echo "  fund ADDR=...   Fund a testnet address using Friendbot"
-	@echo "  invoke FUNC=... Invoke a method on deployed contract (set CONTRACT_ID or CONTRACT_ID_FILE)"
-	@echo "  test            Run cargo test"
-	@echo "  fmt             Run cargo fmt"
-	@echo "  lint            Run cargo clippy"
-	@echo "  clean           Run cargo clean"
+	@echo "Contract Fox - Soroban Smart Contracts"
+	@echo ""
+	@echo "Available targets:"
+	@echo "  build              Build the entire workspace"
+	@echo "  build-contracts    Build all contract WASMs for Soroban"
+	@echo "  test               Run all tests (workspace + contracts)"
+	@echo "  deploy-testnet     Deploy contracts to Soroban testnet"
+	@echo "  deploy-mainnet     Deploy contracts to Soroban mainnet"
+	@echo "  fmt                Format code with cargo fmt"
+	@echo "  lint               Lint code with cargo clippy"
+	@echo "  clean              Clean all build artifacts"
+	@echo ""
+	@echo "Configuration:"
+	@echo "  NETWORK            Network for deployment (default: testnet)"
+	@echo "  RELEASE_FLAG       Build flag for contracts (default: --release)"
 
 build:
 	cargo build --workspace
 
-wasm:
-	@which cargo >/dev/null 2>&1 || (echo "cargo not found"; exit 1)
-	@rustup target add $(WASM_TARGET) >/dev/null 2>&1 || true
-	cargo build -p $(CONTRACT_PKG) --target $(WASM_TARGET) $(RELEASE_FLAG)
+build-contracts:
+	@echo "Building all contract WASMs..."
+	@for contract in $(CONTRACTS); do \
+		echo "Building $$contract..."; \
+		rustup target add $(WASM_TARGET) 2>/dev/null || true; \
+		cargo build -p $$contract --target $(WASM_TARGET) $(RELEASE_FLAG) || exit 1; \
+	done
+	@echo "All contracts built successfully"
 
-deploy: wasm
+deploy-testnet: build-contracts
 	@command -v soroban >/dev/null 2>&1 || (echo "soroban CLI not found; install via 'cargo install soroban-cli'"; exit 1)
-	@echo "Deploying $(WASM_FILE) to network=$(NETWORK)"
-	@soroban contract deploy --wasm $(WASM_FILE) --network $(NETWORK) | tee $(CONTRACT_ID_FILE)
-	@echo "Contract ID stored in $(CONTRACT_ID_FILE)"
+	@echo "Deploying contracts to Soroban testnet..."
+	@for contract in $(CONTRACTS); do \
+		WASM_FILE="target/$(WASM_TARGET)/release/$${contract}.wasm"; \
+		if [ -f "$$WASM_FILE" ]; then \
+			echo "Deploying $$WASM_FILE..."; \
+			soroban contract deploy --wasm "$$WASM_FILE" --network testnet || exit 1; \
+		fi; \
+	done
+	@echo "All contracts deployed to testnet"
+
+deploy-mainnet: build-contracts
+	@command -v soroban >/dev/null 2>&1 || (echo "soroban CLI not found; install via 'cargo install soroban-cli'"; exit 1)
+	@echo "Deploying contracts to Soroban mainnet..."
+	@for contract in $(CONTRACTS); do \
+		WASM_FILE="target/$(WASM_TARGET)/release/$${contract}.wasm"; \
+		if [ -f "$$WASM_FILE" ]; then \
+			echo "Deploying $$WASM_FILE..."; \
+			soroban contract deploy --wasm "$$WASM_FILE" --network mainnet || exit 1; \
+		fi; \
+	done
+	@echo "All contracts deployed to mainnet"
 
 fund:
 	@if [ -z "$(ADDR)" ]; then echo "Usage: make fund ADDR=G..."; exit 1; fi
@@ -57,8 +81,8 @@ fund:
 invoke:
 	@command -v soroban >/dev/null 2>&1 || (echo "soroban CLI not found; install via 'cargo install soroban-cli'"; exit 1)
 	@if [ -z "$(FUNC)" ]; then echo "Usage: make invoke FUNC=<method> [CONTRACT_ID=<id>] [ARGS='arg1 arg2']"; exit 1; fi
-	@CONTRACT_ID=$${CONTRACT_ID:-$$(cat $(CONTRACT_ID_FILE) 2>/dev/null || true)}; \
-	if [ -z "$$CONTRACT_ID" ]; then echo "Contract ID not set and $(CONTRACT_ID_FILE) missing"; exit 1; fi; \
+	@CONTRACT_ID=$${CONTRACT_ID:-$$(cat .contract_id 2>/dev/null || true)}; \
+	if [ -z "$$CONTRACT_ID" ]; then echo "Contract ID not set and .contract_id missing"; exit 1; fi; \
 	ARGS=$${ARGS:-}; \
 	set -x; soroban contract invoke --id "$$CONTRACT_ID" --network $(NETWORK) --fn $(FUNC) --args $$ARGS
 
diff --git a/contracts/campaign/Cargo.toml b/contracts/campaign/Cargo.toml
new file mode 100644
index 0000000..507d279
--- /dev/null
+++ b/contracts/campaign/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "campaign-contract"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+soroban-sdk = "20.5.0"
+stellar-strkey = "0.0.8"
+ed25519-dalek = "2"
+
+[dev-dependencies]
+soroban-sdk = { version = "20.5.0", features = ["testutils"] }
diff --git a/contracts/campaign/src/lib.rs b/contracts/campaign/src/lib.rs
new file mode 100644
index 0000000..4df4daf
--- /dev/null
+++ b/contracts/campaign/src/lib.rs
@@ -0,0 +1,33 @@
+#![no_std]
+
+use soroban_sdk::{Address, Env, Symbol, contract, contractimpl};
+
+#[contract]
+pub struct CampaignContract;
+
+#[contractimpl]
+impl CampaignContract {
+    /// Create a new campaign
+    pub fn create(env: Env, campaign_id: Symbol, title: Symbol, target: i128, deadline: u64) {
+        let key = Symbol::new(&env, "campaign_data");
+        env.storage()
+            .instance()
+            .set(&key, &(campaign_id, title, target, deadline));
+    }
+
+    /// Get campaign status
+    pub fn get_status(env: Env) -> (Symbol, Symbol, i128, u64) {
+        let key = Symbol::new(&env, "campaign_data");
+        env.storage().instance().get(&key).unwrap()
+    }
+
+    /// Check if campaign is active
+    pub fn is_active(env: Env) -> bool {
+        let key = Symbol::new(&env, "campaign_data");
+        let (_id, _title, _target, deadline): (Symbol, Symbol, i128, u64) =
+            env.storage().instance().get(&key).unwrap();
+
+        let current_time = env.ledger().timestamp();
+        current_time < deadline
+    }
+}
diff --git a/contracts/donation/Cargo.toml b/contracts/donation/Cargo.toml
new file mode 100644
index 0000000..291a1b9
--- /dev/null
+++ b/contracts/donation/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "donation-contract"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+soroban-sdk = "20.5.0"
+stellar-strkey = "0.0.8"
+ed25519-dalek = "2"
+
+[dev-dependencies]
+soroban-sdk = { version = "20.5.0", features = ["testutils"] }
diff --git a/contracts/donation/src/lib.rs b/contracts/donation/src/lib.rs
new file mode 100644
index 0000000..ef5e330
--- /dev/null
+++ b/contracts/donation/src/lib.rs
@@ -0,0 +1,35 @@
+#![no_std]
+
+use soroban_sdk::{Address, Env, Symbol, contract, contractimpl};
+
+#[contract]
+pub struct DonationContract;
+
+#[contractimpl]
+impl DonationContract {
+    /// Initialize a donation campaign
+    pub fn initialize(env: Env, campaign_id: Symbol, target_amount: i128, beneficiary: Address) {
+        let key = Symbol::new(&env, "campaign");
+        env.storage()
+            .instance()
+            .set(&key, &(campaign_id, target_amount, beneficiary));
+    }
+
+    /// Donate funds to the campaign
+    pub fn donate(env: Env, donor: Address, amount: i128) -> i128 {
+        donor.require_auth();
+
+        let key = Symbol::new(&env, "total_donated");
+        let total: i128 = env.storage().instance().get(&key).unwrap_or(0);
+        let new_total = total + amount;
+
+        env.storage().instance().set(&key, &new_total);
+        new_total
+    }
+
+    /// Get total donations received
+    pub fn get_total_donated(env: Env) -> i128 {
+        let key = Symbol::new(&env, "total_donated");
+        env.storage().instance().get(&key).unwrap_or(0)
+    }
+}
diff --git a/contracts/withdrawal/Cargo.toml b/contracts/withdrawal/Cargo.toml
new file mode 100644
index 0000000..41cf653
--- /dev/null
+++ b/contracts/withdrawal/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "withdrawal-contract"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+soroban-sdk = "20.5.0"
+stellar-strkey = "0.0.8"
+ed25519-dalek = "2"
+
+[dev-dependencies]
+soroban-sdk = { version = "20.5.0", features = ["testutils"] }
diff --git a/contracts/withdrawal/src/lib.rs b/contracts/withdrawal/src/lib.rs
new file mode 100644
index 0000000..8efb754
--- /dev/null
+++ b/contracts/withdrawal/src/lib.rs
@@ -0,0 +1,44 @@
+#![no_std]
+
+use soroban_sdk::{Address, Env, Symbol, contract, contractimpl};
+
+#[contract]
+pub struct WithdrawalContract;
+
+#[contractimpl]
+impl WithdrawalContract {
+    /// Initialize withdrawal settings
+    pub fn initialize(env: Env, beneficiary: Address, max_withdrawal: i128) {
+        let key = Symbol::new(&env, "settings");
+        env.storage()
+            .instance()
+            .set(&key, &(beneficiary, max_withdrawal));
+    }
+
+    /// Withdraw funds from the contract
+    pub fn withdraw(env: Env, amount: i128) -> bool {
+        let key = Symbol::new(&env, "settings");
+        let (beneficiary, max_withdrawal): (Address, i128) =
+            env.storage().instance().get(&key).unwrap();
+
+        beneficiary.require_auth();
+
+        if amount > max_withdrawal {
+            return false;
+        }
+
+        let withdrawn_key = Symbol::new(&env, "total_withdrawn");
+        let total: i128 = env.storage().instance().get(&withdrawn_key).unwrap_or(0);
+        env.storage()
+            .instance()
+            .set(&withdrawn_key, &(total + amount));
+
+        true
+    }
+
+    /// Get total withdrawn
+    pub fn get_total_withdrawn(env: Env) -> i128 {
+        let key = Symbol::new(&env, "total_withdrawn");
+        env.storage().instance().get(&key).unwrap_or(0)
+    }
+}
diff --git a/sdk/Cargo.toml b/sdk/Cargo.toml
new file mode 100644
index 0000000..7c29b82
--- /dev/null
+++ b/sdk/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "contract-fox-sdk"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+soroban-sdk = "20.5.0"
+stellar-strkey = "0.0.8"
+ed25519-dalek = "2"
diff --git a/sdk/src/lib.rs b/sdk/src/lib.rs
new file mode 100644
index 0000000..d82a80e
--- /dev/null
+++ b/sdk/src/lib.rs
@@ -0,0 +1,6 @@
+/// Contract Fox SDK - Common utilities for smart contracts
+pub mod types;
+pub mod utils;
+
+pub use types::*;
+pub use utils::*;
diff --git a/sdk/src/types.rs b/sdk/src/types.rs
new file mode 100644
index 0000000..f9012c5
--- /dev/null
+++ b/sdk/src/types.rs
@@ -0,0 +1,18 @@
+use soroban_sdk::{Address, Symbol};
+
+/// Campaign information structure
+#[derive(Clone, Debug)]
+pub struct Campaign {
+    pub id: Symbol,
+    pub title: Symbol,
+    pub target_amount: i128,
+    pub deadline: u64,
+}
+
+/// Donation record structure
+#[derive(Clone, Debug)]
+pub struct Donation {
+    pub donor: Address,
+    pub amount: i128,
+    pub campaign_id: Symbol,
+}
diff --git a/sdk/src/utils.rs b/sdk/src/utils.rs
new file mode 100644
index 0000000..7f6043e
--- /dev/null
+++ b/sdk/src/utils.rs
@@ -0,0 +1,40 @@
+/// Utility functions for contract operations
+
+/// Validate amount is positive
+pub fn validate_amount(amount: i128) -> bool {
+    amount > 0
+}
+
+/// Calculate fee from amount (1% default)
+pub fn calculate_fee(amount: i128) -> i128 {
+    (amount * 1) / 100
+}
+
+/// Calculate net amount after fee
+pub fn calculate_net_amount(amount: i128) -> i128 {
+    amount - calculate_fee(amount)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_validate_amount() {
+        assert!(validate_amount(100));
+        assert!(!validate_amount(0));
+        assert!(!validate_amount(-100));
+    }
+
+    #[test]
+    fn test_calculate_fee() {
+        assert_eq!(calculate_fee(100), 1);
+        assert_eq!(calculate_fee(1000), 10);
+    }
+
+    #[test]
+    fn test_calculate_net_amount() {
+        assert_eq!(calculate_net_amount(100), 99);
+        assert_eq!(calculate_net_amount(1000), 990);
+    }
+}
diff --git a/worker/Cargo.toml b/worker/Cargo.toml
new file mode 100644
index 0000000..df0dacc
--- /dev/null
+++ b/worker/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "contract-fox-worker"
+version = "0.1.0"
+edition = "2024"
+
+[[bin]]
+name = "worker"
+path = "src/main.rs"
+
+[dependencies]
+reqwest = { version = "0.12", features = ["blocking", "json"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+thiserror = "1"
+tokio = { version = "1", features = ["rt-multi-thread", "macros"] }
+stellar-strkey = "0.0.8"
+ed25519-dalek = "2"
diff --git a/worker/src/main.rs b/worker/src/main.rs
new file mode 100644
index 0000000..b2987e7
--- /dev/null
+++ b/worker/src/main.rs
@@ -0,0 +1,46 @@
+// Contract Fox Worker - Background service for contract management
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct WorkerConfig {
+    pub rpc_url: String,
+    pub poll_interval: u64,
+    pub network: String,
+}
+
+impl Default for WorkerConfig {
+    fn default() -> Self {
+        Self {
+            rpc_url: "https://soroban-testnet.stellar.org/".to_string(),
+            poll_interval: 30,
+            network: "testnet".to_string(),
+        }
+    }
+}
+
+pub async fn run_worker(config: WorkerConfig) -> Result<(), Box<dyn std::error::Error>> {
+    println!("Starting worker with config: {:?}", config);
+
+    loop {
+        println!("Polling for contract updates...");
+        tokio::time::sleep(tokio::time::Duration::from_secs(config.poll_interval)).await;
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let config = WorkerConfig::default();
+    run_worker(config).await
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_default_config() {
+        let config = WorkerConfig::default();
+        assert_eq!(config.network, "testnet");
+        assert_eq!(config.poll_interval, 30);
+    }
+}