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 0x11a5a04125d8d3c5781997f7bfdf2d0797224823ab90b763df13b29a8f43bc88. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a09b8fd-5b78-410e-b6db-7c3c9394b96e.json and https://artists.proofprofile.net/proofs/artist/6a09b8fd-5b78-410e-b6db-7c3c9394b96e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Polish Patriotic Songs (Polska Muzyka Patriotyczna)
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 0x171de0cd3694d0aee141640c54d55d4036fcf4ebe244876031248424591e086d. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/USHM21383871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3d89adaca594282b9a87d270e96dd0fd9091f5b93159dd86c7855d9c361c08. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USHM21383877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15c8f83d91173eee442a28c4a1fde23b7537f6c3a9fd3aae8d18f087846c7c1. 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/USHM21383883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ccfa4de46f94c60246363e0aefd2af427916a845de97488bc25ed5c3c6c684. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/USHM21383886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686aae6e750478824900266e35d09261e85182610c6c1bd828cdc06c4f4fb9cd. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/USHM21383887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a844ed37ae195dff3ebdc91eadfe168b67ed54b1b0f3cad064e3af318302e6b. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:34:57Z), 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/USHM21383889.