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 0xaa6dc5c961c18e233910ccf68e7e300f1ff6247069fe05af065a3e182c6d5433. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf95943f-d3b7-4472-bc44-6e158b61ecfc.json and https://artists.proofprofile.net/proofs/artist/bf95943f-d3b7-4472-bc44-6e158b61ecfc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kurt Weill. Mahagonny. Chansons Des Quais. Kleine Dreigroschenmusik
Mahagonny. Ein Songspiel - I. Mahagonny -Song: Mahagonny. Ein Songspiel - I. Mahagonny -Song
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 0x75870a495949be04f3181652fa5b9d6ef221fd1f75074e07241faef79be8fc15. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEGN51900101.
Mahagonny. Ein Songspiel - Alabama-Song: Mahagonny. Ein Songspiel - Alabama-Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96a60b1b5e1c8f6136d9d6b5874a8cc7bef0a876a9997ef8f120ca53c6f6ea2. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEGN51900102.
Chansons Des Quais - Tango Habanera: Chansons Des Quais - Tango Habanera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fce17713b2e98e67e9d2ab54f0de8f74e67f2c109df05d77f599ba719d461d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEGN51900113.
Kleine Dreigroschenmusik: Kleine Dreigroschenmusik - 2. Die Moritat Von Mackie Messer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e57aafb1a5642cd72a62ff71a4c4e23c02d0008cf2d94db499c4a47a0d35bb1. 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/DEGN51900118.
Kurt Weill: Song of the Blind Girl (Song of the White Cheese)
Kurt Weill: Lied vom blinden Mädchen (Lied vom weißen Käse)
Die Fledermaus: Act II: Introduction: Ein Souper heut' uns winkt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cda1c346db316bd81852cae2db4a69673463a92aa8f02f783948878c567e8d. 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/DEP629601260.