thumb|Frank Bretschneider (2015) thumb|300px|The group Signal (from left to right): Frank Bretschneider (Komet), Carsten Nicolai (Noto) and Olaf Bender (Byetone), playing live at MUTEK 2004 Frank Bre
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 0xadd3e3dc5357b1b547859cc467745944030e8249dfb16b6efaf5de05cdf47420. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90e02544-e345-4a60-b739-4bd816b088ff.json and https://artists.proofprofile.net/proofs/artist/90e02544-e345-4a60-b739-4bd816b088ff.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 0xd7696381756e4a2157cf5020bf1aa36459887a633dafa30ec156dc8ff8d7a2c1. 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/US23K0800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58a0f98221f8aa51afe92d6c91e301f4bf7ceca9b168a83e5ce9ab507046287. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US23K0800027.
Aerial Riverseries (Frank Bretschneider on Olafur Eliasson)
looping I-VI (and other assorted love songs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75256dcdd69d46da88a357b2907bfab7aa7c7afac7591da5240ebd35a2dc1eb. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T19:51:24Z), 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/DEAS90700171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fdf122de05edb82c149333528a18c9ebadb8e24830adda5a10f8274f698180. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T11:38:22Z), 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/DEAS90700173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002c64cba0118447c52b25847dbf167cbf025f2b64f979dbb590632ad4091d58. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEX181700087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54412769f771b905d078d11448533ed1669c3aab3e069749396c42f75d7b6a89. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/DEX181700089.
Go! Said the Bird (Tennis Version) - Mixed
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e582a55f3eeb254700db8a5ac03bd7f18ea980078c8602653f7d80f9d8a8959. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEG931791855.
You'd Be So Nice To Come Home To - Frank Bretschneider Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a298d57a9e05ca7115570a26615e9af9ee3bd4182f2e4f02578512fc1e37d2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GB9VQ2400008.
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 0x9c41e440945001814c697abf6712d6d36af3f072321173bea1ff79d460558859. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM4TW1884594.