thumb|200px|right|Tunjos in the Museo del Oro, Bogotá thumb|200px|right|Zoomorph tunjo in the Museo del Oro thumb|200px|right|Tunjo mold in the Museo del Oro thumb|200px|right|Tunjos of tumbaga in the
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 0x59af2baa72d63cd50341f4cfa4ad2151b864ad9997fae68b8b84c34eb9e80bb7. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/68e64e9b-a1e5-4f44-a28d-16c82c1e7a90.json and https://artists.proofprofile.net/proofs/artist/68e64e9b-a1e5-4f44-a28d-16c82c1e7a90.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 0xac25755dc54d6803f7e882ea666421452abd1d3b7814bf9d2d0034f4db4c98cd. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/MXUM62200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2854b038fc49d04653296132bdac79583e8f099c24654b9b8193a34ff95344. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/MXUM62300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb9493fc855cc39a6cce87a17ded277f42bb7911b558bd3454cbb0c03800d8a. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/MXUM62300207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8eef532b298a475e7b18600c67a31fed0f2de5ff4698e5feadaa2d2c1dbca26. 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/MXUM62300426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1b5eeac6cd4e1951f1cbf685522323aaf72d9fee6eb170d96443e773e296e4. 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/MXF172427468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a27283ae130ff30cc641c13f3ff231e1cc031494a95e26d7db2e3c3ee29009c. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/MXF172427574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7326f38116f3ba42cff83d192e9d65f513aa2ad9ad13c7d7dd5484569dc2cd1a. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/MXF172427731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe48519ebe52b90c469d24b92c6225547b6202cb1cda7ccc3bbda890f5887de1. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/MXF172527917.