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 0xeab4a8ce43e75561c3ba5b24fd32ede416677f1a58890d129bfb54882993a0fb. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b6a8832-8b17-4261-8b75-4f8dd4e75979.json and https://artists.proofprofile.net/proofs/artist/5b6a8832-8b17-4261-8b75-4f8dd4e75979.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Liszt: Les Preludes; Totentanz; Two Transcriptions by Heinz Holliger "Tasso, Lamento e Trionfo"
Martin, Lutoslawski & Ibert: Concertante
Sinfonia Veneziana - Sinfonia "Il giorno onomastico" - 26 Variazioni sull'aria "La follia di Spagna"
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 0x6d1cf32a9d297f4001e3bb86754008cb036bc8d18dbeeb45ea000f9b3a7d7b42. 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/ITD017800420.
II Variazione sull'aria "La follia di Spagna"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b10de5f19b648ca6f33f494992f1ebf7a252737d58ec00b8642aca4bceae16. 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/ITD017800425.
Burlesque in D Minor for Piano and Orchestra, AV 85
Memories – The Unreleased Recordings 1970-2019
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce2bdfa84048de11bd669ffc7e2bf9798351aadf1e7940847eb885dfa3ac0a9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBBBC2200929.
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 0x7575dbbeea7f81c2672c558f8b966353fbf41e58c4ba3eb7d0fc82a68834a68a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ITD017800418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af7b83e4026b74666b6cd34c59fa3f5a63f1dd4258df9963c9b8a2c8531c9ba. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/ITD017800422.
I Variazione sull'aria "La follia di Spagna"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcdf6edcd5e2b1aee011175a4a5f9c2c837420cf7587b53146f419c4e2d40e2. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ITD017800424.