Sun Tzu (;) was a Chinese military general, strategist, philosopher, and writer who lived during the Eastern Zhou period (771–256 BC). Sun Tzu is traditionally credited as the author of The Art of War
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f76b387dfeec35696a131ef33c6b430bc8cf4897383d49eeb676de0f636c85. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e838b067-2999-43a0-903b-a95eb6b679c8.json and https://artists.proofprofile.net/proofs/artist/e838b067-2999-43a0-903b-a95eb6b679c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sun Tzu: Die Kunst des Krieges (Der Klassiker der Konfliktstrategie)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5f1938c3f8a58179b52e74b873497760a85463c830f3afc492605eb097e22a. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T16:52:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM51399473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08008357a720711cf3f65e3e4b4953f0fa1a100014dd0225993e6668d84930d0. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAAT1016457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00f26c7d10976d568bac933557af3895ec5af320456eed780e74c76f16d04e4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAAT1016459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a3ac8b745f2cc7ec5d495ded5c85afd2e4078630241e23e5f220d5728f5d12. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAAT1016460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb3a4e8f72dd19a991d29ff4ed9b3c451aa1c03069ac85bb31be231d3429eed. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAAT1016461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e46ecaf7b73aaae039da700d4c7deb656c63164471863880886c40e6980d136. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T05:02:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAAT1016462.
El Arte de la Guerra: Cap. 10 - Sobre la Topología
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63eb794c403a606f2c541ed6597d4e806230735b30ec758fefb7e781183d40f3. Chain 2 (Bitcoin): anchored in block 957892 (2026-07-13T18:21:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931500213.
El Arte de la Guerra: Cap. 11 - Sobre las Nueve Clases de Terreno
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cb97efeece9bbbdd5bbc65a4b5a92930b18415884075b9c44645039ffe2e0c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931500214.
El Arte de la Guerra: Cap. 12 - Sobre el Arte de Atacar por el Fuego
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9a85f49bc375ed791183e09a80207cc9f22dbe2197d3b6bc7019762d7bd77c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931500215.
El Arte de la Guerra: Cap. 13 - Sobre la Concordia y la Discordia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c76d816a0343afbedbecac3e201174020db1e028a569ce8d1a1518de8a0fdd1. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931500216.
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Capítulo 1 & Capítulo 2.1 - El arte de la guerra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75e6da66cfbb13e4f92adad5a29580dd2ab5c6ef9e7e33cd1f5b96aa5d7a28f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM40867491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2266f4d4d194a3118b1bd9e0e48f608d12e5feab8e51fefb5375d6c707bf2aa. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM40867492.
15+ Political Science. Classics Collection (The Art of War, Tao Te Ching, The Republic, Meditations, The Prince, Utopia, Utilitarianism, Anarchism and others)
300 Quotes to Learn Strategy with Sun Tzu, Machiavelli, Napoleon
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170e84c0dcb42f91440e33c307f28d658d670ced2523a8bdcfee9010685235a4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXN82448789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a1cb6362331972917aeb5b846c750794d81360366e06c78bc47c86566c6317. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXN82448790.