The Black Pyramid () was built by King Amenemhat III during the late Middle Kingdom of Egypt (2055–1650 BC). It is one of the five remaining pyramids of the original 11 pyramids at Dahshur in Egypt.
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 0x0d2de53e8fa64b08ab72108937d3d36e278bc20992d9443c7b62baed8862c67f. 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/90d8702f-5f22-4c2c-893c-6f7cac4f3309.json and https://artists.proofprofile.net/proofs/artist/90d8702f-5f22-4c2c-893c-6f7cac4f3309.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x7469f49d7e6097976c0c2a2b1c1ae7a64d3468a2c341b3879df8fbb84c8b12d7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAIG2438655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe007999e9972301a44e18b97dc17bd83261d1ecab28b09650d5f26907e434e25. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAIG2438670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74a54e71a7616af0656e116c72aef1123d5112b9033c1666208195af200ac37. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAIG2438682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90881d655eadc2dab68f5339d1e61b7a250597162137288da3f603ae15b08a77. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAIG2438694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1257efdd3be9f857c14a8aa57327cc0c0922c6306aa19b865b9e25f858af14. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAIG2438707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f76ec138e1e5e151f68bf31dc976a2df99b6ed7a4e47faf63ff15fc1c713fd3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAIH2438723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a914976048a8767868371fcfb1bbd79dedc3c7e6e8238c23a134b50ee23701. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAIG2438730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5eb2ea85a379591ac8ba1209ff8a24e701a7e4a967dc9d88aa1d92c5fa652f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAIG2438747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3f8238404668c8fc85a33383960aaf3604a3c92ae25cb2d7052f27c1c4638a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA371499597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88308d733494ce9357fc4570e240b943147fae6d23562c339e17e46c50c089b8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA371499598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f712d3479945f28b44b7cee9a5d279d338325ce9db92fa7e195b46ee9c35ee8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA371499599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000d9293db6f7ee084073d05bc50c9ec5f4dc7a07a951aeab1a2b450960b5ff9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCADW1853237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92428bd88b94a73119beaf34ad83b153a34d1f503e4b0b696269a45d24255b29. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:58:48Z), 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/TCADW1853243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3918f7a121e56a0a8fce6c5b1b698c187fe00369192a3d6a0d56c57a9ff4b2a3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US4B20600536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c88ae2bb9cbd0e25c6f0238cb5085bfae382a8862db346bd6af2f84e152b0e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US4B20600537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fe92e282ed7b76008b7b45a0b5d1a394654a6c294896dd17c4e51bac072725. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US4B20600538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ee60b550049eb40605dcd9f674aadde89f98fcfd9e1fe05d6f52b816ff8d86. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US4B20600539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66c359cc10307dbfb8024d11d04fb819cfdaaeb27e43157e864a9c2e99589bf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US4B20600540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9425ec708f4f749e39815f6ee17d6d4f23623e7782bb980bdc70beb90af6c9e9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US4B20600541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5a2403419508e5d6bdbaeef1d079b8011e9c2927fc88b0cf799c63352a77f3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US4B20600542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d4b698fb3c78c3290cf86e12657505d3ad359f3a13bd4d0d1e28f04428f5f9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US4B20600543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb3f01834acef636f9289a5b83f4a69d4bb1f342850ffa048733df9b29f5f2c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US4B20600544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f0e3ce8c176bfca576b11ca3f674f1544d6d0ca1bb2741e4188bc197cf752f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCABM1362481.