Soho is a district of Westminster, in the City of Westminster in the West End of London. Originally a fashionable district for the aristocracy, it has been one of the main entertainment districts in t
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 0xf92ba03e6392a5d0392868b264f7fdd453a81b241c4917fad38fa6008275df04. 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/3f93a4b5-c270-4766-851e-c22443940fad.json and https://artists.proofprofile.net/proofs/artist/3f93a4b5-c270-4766-851e-c22443940fad.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 0xccdd99a819cb205e639803eda69ec4baad3a74d69622c31351ff614297e350bc. 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/CA5KR1565981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33673a79e01ba6e576ebb4bf56d36e7860757b1865a79e619bdc13b378e15097. 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/QZBRF1821615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5068e498e796ce045a45ef5f2ee645ae28777b7cf6f74c0d6fa7088431515d85. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZBRF1821620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa012a677f8542e2499194876d6fe845726a5e3d76009d126da04255cc70e7077. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZBRF1821623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1567926de78610de5ff668718d4b684b10cb6d58e89ab9fcfb3b2b739c2631. 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/QZES91978251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fa0238c33e9aa01db485f3dd90d96e5c9d7676214b80187d296a6454980833. 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/QZFYW1979999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a78cedcdbfced7a08b80893f22075c21c8b1ae1787d70c3ac321e425d4327b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QM24S2001447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfb9b0e047c9895b111ff664dc5f74568611eccf8c91ce3fb8bf2b4aba015dd. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QM24S2001448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc310d69f161ca3f2003e26ff9f892ba302d440e38a7393eed86a2d2c4e1f87. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QM24S2001449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418b17ae2274d764a35a3d8ca520952ab0f2b840f05f784c4599751ffaa11082. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/US3DF2233770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40762817022c9930c0f05adeb7e12aadcca2c68852c67433c471873ec33fc61. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/US3DF2233774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36270ad861b72ea82ed9a21e6b120be887532b7d70df3796ad667a4f6754cf9d. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/US3DF2233778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53b03f8154137b5241edad8b8b555d2d848f9e0fbe7800bdbb25fd72a4fbad8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAEM1966158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6fe1526e7be417b721bf296e68c385e7572bfa10692010b4ce3566954a82c1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU2101979.