Eiffel usually is a reference to Gustave Eiffel (1832–1923), engineer and designer of the Eiffel Tower and the Statue of Liberty, and may refer to: Places Eiffel Tower, in Paris, France, designed by
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 0x07a15d1175cd298a1e4833be73d2154667f86b85b0758fe6d0bc08e968d3d105. 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/e693ac03-e8fe-4858-9390-6d8374cd9214.json and https://artists.proofprofile.net/proofs/artist/e693ac03-e8fe-4858-9390-6d8374cd9214.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 0x98d8ef655c2328bd7292ac50feb0968167daf717496b391d86f963887c8728f0. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/FRS940000107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9a790c6f02435f4cfd5be38046fea363dc471c79aa260e59bf9528cdc89e1e. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRS940000110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8becff0ffb50d29e051d00992c21745b03e0a098c3440cc288663b7c14e39c. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/FRS940000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17bcda23b3aba4eb58362fe9dbdd6f3aa7872e7d9bf7739b8a5f1372ed4be072. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FRS940000109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0dce4a0ac976afcc4fbc78a5184142211dfd6fca4f8247139d0e32804565c4. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/FRS940000115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b987c104c8a6c25a3ee3fd7c1aed4adcaa6ebdaf164bb74a1b39030205c9af. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/FRS940200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e27402d7573962c8bbad66c1d1eb707aeb0e5310c5d58a45516a69504fe7e2. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRS940200047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0730b89faaeb430fe232298a23dfc19e6fbccb64a533c644c48bdef92959b8d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRS940200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44f1358bd381469f2d6535d92b6820b5d41d55250fa5e73aa22f504b1c46ed6. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FRS940200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa284b555666c89de2ad76b2c1b74df8640854ba2e54a51f5487912b72ab88c3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRS940300148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772bf367d5179ec29b62072dc6c52d9c95d9026c6a2f91ce7e50b862e215e362. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110601110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008b4208340c0e6592a43fa2e26d22bed70607ccc5b49800355a7c6fa631bdb2. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/FRZ110601122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3898ec6e67e2a897a88a1c02295899af71d2ee5435aebe215719b755aa2dd3ea. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FRZ110601111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6794ffdaac5ee2f41be3b6a5f7eeda07ec10750e9f01903f7919b9be7923138. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110601131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d85bb1afe495b4068a3859ca706ecece688fd67d49c1f08d3aa009663bc6e3. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110601134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe519daa5622fbc9371d93f86502e213b4583db290cdace5ce9317e11424532. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/FRX850900204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f71749455cf66c3574add1637207f3a4891b4e2f3e48df0b8d4e718b10ef1b3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX850900206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ae229bf79fed14672cafaff33dedc404599f846bd7d959ce7a65c3c9940709. 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/FRX850900213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2997aad82cd055da5180181421c72e170402f41cd6ea19a0df2e79d725332fc3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX850900216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82ed827f9c4ad4899ec9a5abfe4cab00ade95ae6c202f81a9b9fbc671778afb. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/FRX850900207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a66f5852797934aa4f43d5b2a663292935392eb1bc51ecbde42875258150059. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/FRX850900214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5db1c776e2325e8abf8e7078b48be8858baea216894fffc408e3baa78e9b68. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRX851200320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e861ac30dba9d9bb1b5aa204dc08e4406e0050f38774e4d2224ed2ecc92724. 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/FRX851200326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3809ecd675a80b2ba7cecf55122d6fc9c11c5654a47cf4df631e161f1b02f2. 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/FRX851200327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423ec7f499f9cb56b5726fab4e51eb02d77bc6bf1322d1d854d5adaf6dcbd50f. 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/FRX851200328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa350d5922fd4f0b6e7e73ed59ca76eee93f846e4dbe023aa0598dacc60f02e. 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/FRX851200329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd99f4be9ab8e6d231450ebd9358a3f406452381ea3250a9aab109ac70f8c9e. 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/FRX851200330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3573f39c2258c1522873ba25fc6f5bfe5a37b1da9e5cf582a346adbb3ba53c1f. 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/FRX851200331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401b9bfe2685311561ea4f3908c55da6854871dfc3ed1ef3905cd4f6b4f3e507. 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/FRX851200332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3f56d19f9a2fd0bddf3a64c4230a7eed39d4ad63c4669afb5537b4db6eeed1. 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/FRX851200333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62de05aa5a92d6ead1499aec13218a1c353cad481064f7104df2bfc3023a1482. 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/FRX851200334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11a0386eb0eccb54d6076db2b7bcebdb3e806e9ee89fc27b69ef542b97e51d2. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/FRX851200335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdb376d0324c899cecc4f4e8723d6a2c5f1c6d97853b26bc8db973a454244de. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRX851200336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13b2db45fc26f57cf52359c2b80cf525c2fa4e532b1155c311c0c1417812b3e. 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/FRX851200338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79bbe4e79b89f720a9b1de9e615ae4ee12aef8e6866b3f066b7475b869e23e7. 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/FRX851801527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93df8866647d80e3d00a7c1148771bcba031ff3de09fe175ff41f182cf23d6b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX851801530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d3c8e08127444bd7d23adcdd9858f52d3c19b2a8b29711e14804734aa92bdb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX851801529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528907532f548ca2f175b4a84e87a8063f4950a3691d938a400122bf86415f30. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FRX851801558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21ba2fe65ac1b62c4f22a3c0d2754cc445032a537729608210f593d3a06ffe0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX851801559.