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 0x2cb870b5e9cf253c972f9b64b7dd30644f5a619a307cd30b39c291562bdb4c56. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29485949-938f-441b-bca3-903dd1f5afb2.json and https://artists.proofprofile.net/proofs/artist/29485949-938f-441b-bca3-903dd1f5afb2.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 0x073b5b0515c41e3dfbefb3b239d6f6128a6978a05dc74587eff8a6803d3dd941. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T19:31:37Z), 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/TCAJA2493703.
The School of Athens (Raphael, 1509-1511)
The Garden of Earthly Delights (Hieronymus Bosch, 1490-1510)
The Birth of Venus (Botticelli, 1485–1486)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8cd3ff3060264846008aa2281b0c014b6ccefce1040d50120ad68d82ef35ae. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:03:05Z), 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/TCAJH2596780.
Self-Portrait at the Spinet (Fontana, 1577)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cee6f4f8f8e14c52be329de8edb9b88ea086214716a105400ec4c9e248cba1. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/TCAJI2582525.
Liberty Leading the People (Delacroix, 1830)
Girl With a Pearl Earring (Vermeer, C.1665)
The Raft of the Medusa (Géricault, 1818-1819)
Wanderer Above the Sea of Smoke (Friedrich, 1818)