thumb|upright=1.4|Chozos (Spanish: 'huts') in western Spain A hut is a small dwelling, which may be constructed of various local materials. Huts are a type of vernacular (non-academic) architecture,
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 0x9b7e1f50ed993a1d278bbe4883a69e76f40a5bfacfa8d7a4550cfc592436c5cb. 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/d12c6428-03b4-47fb-a3e4-02cafb1489e3.json and https://artists.proofprofile.net/proofs/artist/d12c6428-03b4-47fb-a3e4-02cafb1489e3.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 0x8f05347b8384493b4a27e62cca6534b90a7377444cc308a1f315eb8612ce46ac. 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/PLI360009870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7747d5a02f4cb1689794781549ff9c53af114750db5f698c770c904910fa9a5. 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/PLF242211696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd5a32ed8af2e09ae2dda761c2ded44def90694a36376d3afd0aff30782b0d4. 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/PLA552100319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87e8b504d742914e38b31aa040a58996e3ddfcaa30b5aea9c3cd94b6b1fc6c9. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/PLA552100732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5db05bcfe007f9d6c83939f873497e68e5e4ac8b4f11f1672de2aebcf9576b7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLA552100842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87e8b504d742914e38b31aa040a58996e3ddfcaa30b5aea9c3cd94b6b1fc6c9. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/PLA552100732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7747d5a02f4cb1689794781549ff9c53af114750db5f698c770c904910fa9a5. 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/PLF242211696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3f36e13ede37b73f61c3ac603b4c779edcd5dee0a813787a95710b1df2366a. 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/PLF242413545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f05347b8384493b4a27e62cca6534b90a7377444cc308a1f315eb8612ce46ac. 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/PLI360009870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420fb673b738d40d0d0521cd7cabd6a30ed53de546a3ad12681183b9e7dce925. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PL59G2200267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652911f27a815682ee706efec162cb3467a92b130cc6a0ca4a8520837dae581c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLUM72200547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3f70dafcab384d392d937294f1b09d11ccd05b0604d591b523acbd99d4c511. 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/PL2DY2301587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9431a34ce1805b0952251956332cd3c0edb421872c7d82157af1e59d82e877b8. 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/PL70D2200190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf423446a11710ade003f8f5e8baa2b918c41bc0deb89578c0f3778c6cfaffdbc. 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/PL70D2200218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b87e8116d089da9b5652bb6958ecb05bf286280f2f2d1e16544327d7635dfc4. 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/PLV402101550.