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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e742768848e940433672cedabe2249f365fcbe3679a13f813eee58a6b082ea. 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/a57ffe9a-2cfe-4fbb-a030-5d830bc5f78e.json and https://artists.proofprofile.net/proofs/artist/a57ffe9a-2cfe-4fbb-a030-5d830bc5f78e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fe46e0a8fd924d342cad49beb240bee5921228566a88de50ad795c0860cae3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192050 — a six-check JSON result.
Capítulo 2.2 & Capítulo 3.1 - El Príncipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf2b33f112a083e7802151c4118436145118a1cd2591cdfec55c445ef8e0dbe. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192051 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3969395f2970798f49fdd6f7f31bd71ce726990c9c4ab07fd7824855449a82d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192052 — a six-check JSON result.
Capítulo 3.3 & Capítulo 4.1 - El Príncipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6577577191652f44e5c03a9b664ee92be34ba462498dee0e7c6f3cfb99be5c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192053 — a six-check JSON result.
Capítulo 4.2 & Capítulo 5.1 - El Príncipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94aa3cb7866d892b11d0b4108bdd838655a2c28f4d7c1361ee2ce6d94c2681e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192054 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ad26d0cb18f8e1f58214741f9c8496edf2dbe8c496231fe6f14ee2315bf150. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192055 — a six-check JSON result.
Capítulo 5.3 & Capítulo 6.1 - El Príncipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44171b0f3034f30dfa715c99ba3ab097c14d5b0cea41a87a7add01b0536a2477. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192056 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ced9b8acbe9dbc1444912e1e1372c4a919bb2bf53177d727f1aa12e3c95c0b5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192057 — a six-check JSON result.
Capítulo 6.3 & Capítulo 7.1 - El Príncipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328d611bc924293c384e3c11f31ca73bb2fb78e1a508aafd8bc9482859c22750. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192058 — a six-check JSON result.
Capítulo 7.2 & Capítulo 8.1 - El Príncipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc950c512eb1528a6d2cfe11825f8b39cb029ceac30aba7c8336f8b8ab6ca2fec. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192059 — a six-check JSON result.
Capítulo 8.2 & Capítulo 9.1 - El Príncipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50206ec4f44b2ba1379c2cb1dc062310cc70b8764218d13422d041cc76c536fd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192060 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fada136974cf4555fbe09f0327ca82dd674a52b22cb438f211f789f883f01e9. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXQ92192061 — a six-check JSON result.
El Principe: Cap. 1 - De las Distintas Clases de Principados y de la Forma en Que Se Adquieren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8978c55ed996dcf319c719541ad118bf42212603a5a4e175bdd17c8e2f66eba. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931700292 — a six-check JSON result.
El Principe: Cap. 3 - De los Principados Mixtos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dff2e300065730bf810d05b184b48bb7f5883ac74a5ba2a9cc1754e64c38271. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931700294 — a six-check JSON result.
El Principe: Cap. 4 - Por Qué el Reino de Darío, Ocupado por Alejandro, No Se Sublevó Contra los Sucesores de Éste Después de Su Muerte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730a7e93f43f88577c9e5188690e8e9a2e8fb1f2e14e1de91af4825b499aa100. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931700295 — a six-check JSON result.
El Principe: Cap. 5 - De Qué Modo Hay Que Gobernar las Ciudades o Principados Que, Antes de Ser Ocupados, Se Regían por Sus Propias Leyes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901bd95e4b0bb2cf443c95daa70bcfda21b9c79bfd544bc80fd583331dfd08b7. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931700296 — a six-check JSON result.
El Principe: Cap. 6 - De los Principados Nuevos Que Se Adquieren Con las Armas Propias y el Talento Personal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7296d8c2d782576c9114a83b2387be4c73a86d43f03ec9f2910ab7799a21ce. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931700297 — a six-check JSON result.
El Principe: Cap. 7 - De los Principados Nuevos Que Se Adquieren Con Armas y Fortuna de Otros
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616888cb7c86e58adcf019c29e93bf60c1a2365931048caf0426d669b86167ec. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931700298 — a six-check JSON result.
El Principe: Cap. 9 - Del Principado Civil
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe601da5c879dc7883a4f1ad9b5b0d9eff502ac4815f5b8d95d788966015bde41. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931700300 — a six-check JSON result.
El Principe: Cap. 18 - De Que Modo los Príncipes Deben Cumplir Sus Promesas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf693a64af072a8e6e04e4b799682b31f0b592c056ca1c6f35febd266c67ce1ab. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7931700309 — a six-check JSON result.