Andries Vermeulen (1763–1814) was a Dutch painter. thumb|Ice-sledding Vermeulen was born in Dordrecht. He was taught by his father, Cornelis Vermeulen. He was primarily a landscape painter. He worked
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 0x85b96ffd80aef69f52a210046e053110347346448fcc9eb90093dc327a7e5d16. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79e33fd3-5f19-4e24-bfdc-0ffaeac32c42.json and https://artists.proofprofile.net/proofs/artist/79e33fd3-5f19-4e24-bfdc-0ffaeac32c42.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 0x7af8ebe574dde5039360977802d45491aa5ad3fb369dfe35b3779a57cf2df017. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ZA61A1302623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbfd8165190025613b566407fd01278c370b67ce85d359a2c98adc6c784a15c. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ZAO861500118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012b538b21092ebd3e4396a743fc1e7e0e325f6c70bf50385413e6581b27525f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:35:24Z), 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/ZAO861500121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a66aebd544813a947d6939a2a6b2ad7b1902e59568c7719e8b44a97c21cf227. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:28:58Z), 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/ZAO861700464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3836570a97889687fbbdf065302e953965d7111a06ddea8cc962d167eb577f31. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ZAO861700467.