thumb|right|300px|Kurt Schwitters, Das Undbild, 1919, Staatsgalerie Stuttgart Collage (, from the , "to glue" or "to stick together") is a technique of art creation, primarily used in the visual arts,
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 0x269febbc706bbfb3e0b0f57726402a24be19d273c7c8fcc820a29ca56d8674a3. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41d5cd92-6fe4-42bf-83c4-f1d8da9ec231.json and https://artists.proofprofile.net/proofs/artist/41d5cd92-6fe4-42bf-83c4-f1d8da9ec231.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Romeo Where's Juliet? - Radio Short Version
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 0xcc414a84b8b17e8e4b5de3bd1353a7660d7eba96b33cc923eeb91886a05c006a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/GBAJE8500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc098757c322bf3e6a5adc7203dc0a842ba1c2946eb06781b3cb1343ceddcc5. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBAJE8300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22991898166b9605c69ce0dbfb1f4a7f61917b6387d046ce3e411dcddc702de1. 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/GBAJE8500108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb042414e837dd651d5ad92c1f4e4ff63534e9c520a8dbac1c5d511f4f6e16b68. 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/GBAJE8500211.