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 0x5ae16612fd510c6ab059c10b69f4e12f64f0121d1c9c30620e0e6fddf9a1114c. 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/3a4e0ad2-e535-4604-b5b1-f5362a3077c8.json and https://artists.proofprofile.net/proofs/artist/3a4e0ad2-e535-4604-b5b1-f5362a3077c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
POLO Wiersze - Julian Tuwim - Dyzio Marzyciel
POLO Wiersze - Aleksander Fredro - Bajeczka o osiołku
POLO Wiersze - Ignacy Krasicki - Czapla, ryby i rak
POLO Wiersze - Jan Brzechwa - Staś Pytalski
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 0xa37e5898a5ca2bfb09ecf3b97840e25b8ff18c75188df44813f238974e312ef7. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/PLG231500139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388eceb9ea07d936ed4d0457a3856794c1e6a63a77883f02e6cec0cb074c44ab. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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/PLG231600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c08fed4c4775494baa625ec74d74e165f9de576fa5a25f7d9f35e17b3dc258. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/PLM711900001.