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 0xfc0228937b746af3c43211ebaa4eb112bd8d90efa914065dcee67e65d4e3a6d4. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/68d32867-2961-441b-a355-20c43463c602.json and https://artists.proofprofile.net/proofs/artist/68d32867-2961-441b-a355-20c43463c602.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Homage to the Creative Spirit (The Louvre 2009)
On Canvas: Rembrandt's Return of the Prodigal Son
On Canvas: Manet's Luncheon on the Grass
On Canvas: Vermeer's Girl with the Pearl Earring
On Canvas: Magritte's "The Human Condition"
On Canvas: Mondrian's "Composition II in Red, Blue, and Yellow"
On Canvas: Picasso's "The Old Guitarist"
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 0x20d50af8f7055b5a4cca4ef86d7bd179026f7c4bf9db304b19a7b39fc6b56ed4. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZTB32497865.
On Canvas: Honthorst's "Adoration of the Child"
On Canvas: Avercamp's "Winter Landscape with Skaters"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d50af8f7055b5a4cca4ef86d7bd179026f7c4bf9db304b19a7b39fc6b56ed4. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZTB32497865.
In Stone: The Winged Victory of Samothrace
In Stone: Canova's "Psyche Revived by Cupid's Kiss"