thumb|350px|Equestrian portrait of Isabella II, her husband Francis, King Consort of Spain (left), and Infante Francisco de Paula (right) with the most important Spanish statesmen and army officers of
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 0xd895c780ed318a181728317fe5f125aa7bf7ebe6e461e4594e619b7650c2c548. 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/a3c146d5-f85f-482f-b6f9-a44e80d4746f.json and https://artists.proofprofile.net/proofs/artist/a3c146d5-f85f-482f-b6f9-a44e80d4746f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf711a64e94938d3ac4de3c93ae9cfe32c2ed8174bfb93004a0e68e48b7c116aa. 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/QZK6Q2314870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ee0222c5d81e65b69b80b7756142390f55fd9b7e5931a04d9de04caa219d5f. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZNWW2217206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ade5931d6fcae30b0c0565c51ef4befa76854d67af3898d4bb42892fc25336. 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/QZDA72274524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a63b9b14a9105e98fcb9655fdde70dbdfb243ee6573fb82e7b2bdc95f103f3. 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/QZS652195369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x036d9bfde27f0105cb2f11620baa18c1f5555f0a3d9b52e0e9c8a763a136f4d9. 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/QZK6F2180515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00519a8c617c1fc94aded770a7fb81047a1e48c5fe3d48ee1e9b2501b638e6eb. 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/QZHNC2187127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fe5c935dab2f566a8ddd6a8ae738d980147231ab18d6391776663cd3e21320. 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/QM42K2178003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a63fd80c05694a6d770d05bfe40debc3270761862306024a11bfa421f50772. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZNRS2056375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce16060bc308a0522c60602d7aadc591cbeb96aa68a4320e3601388a0974b60. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZMHM2057745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2fbea7b90855a26464f8ba2c6ff84245483ede26c490e8813eb39842fa5f69. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZJRB2082697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6b973e8228470579dd15826b7e9c9350b4e65df6d957b4e6c8b768229a0151. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/QZKDK2188917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82018904fd25a9452ad0914243aaa703ad65a56728f55b9ecaeab6dc70bd94b2. 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/QZKDK2124021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe207694018f58b127bf4e9091f21c842fa1e1828f1eaeef8d3ed9ac5ff8c5946. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZKDK2020553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ba037b5a7694331b5ad02e6699f0ab6ed8ed7f186ca7ea40b6d346cd5740be. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM42K2003895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834e60fd175503f66dbb4567033a910768127126de3277504af04a755fd20995. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QM42K2031190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2d0d2c29140bb08491954323f3d3e59580e51cc888b5444de0e4ae783783a2. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QM42K2027497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedd5228d7ea775a8f2107681b7aded95d1603d34b3f817d7de5420970e90c32. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZHNB2228462.