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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe1ea1ac1fba4691d45b5940825a831936040f0887f1913701f6b4dfc5d378d. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0ff47ec-2189-4c4c-a333-b04432023da1.json and https://artists.proofprofile.net/proofs/artist/c0ff47ec-2189-4c4c-a333-b04432023da1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
SIRE JA MURE (feat. Luurel Varas, Maris Pihlap & Mattias Tirmaste)
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195ccd27eeee9407e645ad21afe181bb8287f4ccb0a7c1647d5b248005bcd239. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/EEOY32300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ca6f6eb0b0af33e3a99093a823ad0dc56eb26823acbbffd2a0149980958386. 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/EEOY32300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1745f14826560e7c101f1e5874bfd009c292da19e7253acee9060d6110f2310d. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/EEOY32200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa404559255b8eba04576d27f6d00ce7a740c26c4fe1e665aeb83ac60acfe67e6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/EEOY32200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6818695bcc15fdc60ebde0cb103aa43a86a6423d089891862b6a924ac4b32d39. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/EEOY32100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f5a2c4e597d715696d4bf80f0a9ebf5559e515ee7c2df77c821c1785ffcb00. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/EEOY32100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86cd8aa27eb24e3d69c8cfc2a16c5e4259d2a5471005a116ef7d9ca129fc25f6. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/EEBO32000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89899af5d72c36a2d49b8ba9447991c82dfdbeda20fc84ed6d47384c69b76bea. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/EEBO32000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195ccd27eeee9407e645ad21afe181bb8287f4ccb0a7c1647d5b248005bcd239. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/EEOY32300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bb0ee23cbfbae5838b1304d75e85ca45f4d567292429edc768e75081d703a7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBSMU3803456.