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 0x9bb2368400517ca412e9ec40b354ed71077dd3def725b341a373f28aab640287. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e6b7f9c-614f-4c96-8dde-2493a50c585f.json and https://artists.proofprofile.net/proofs/artist/2e6b7f9c-614f-4c96-8dde-2493a50c585f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Pavane, Op. 50 (Arr. for Saxophone and Orchestra)
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 0x3cb20d8dbcb5d81df2fb582d0d34bdc6f999ed41120f84950109252f6678761c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11205578 — a six-check JSON result.
Pergolesi: Stabat Mater: I. Stabat mater dolorosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a9289ad5f3f61f652a831de5657cafb1412ba06eac5fd847b33729344893c0. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302414 — a six-check JSON result.
Puccini: Turandot, Act 1: "Signore, ascolta!" (Liù)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e12d7acb64d5df25c79691148b72481dcf265672d452cf8e8186f54b2ca8772. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302423 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a9289ad5f3f61f652a831de5657cafb1412ba06eac5fd847b33729344893c0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302414 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a6d6ea54293f5be753e9bdb1b75a671c9231d1b05c2d8f56e35537afe7094a. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302407 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb20d8dbcb5d81df2fb582d0d34bdc6f999ed41120f84950109252f6678761c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11205578 — a six-check JSON result.
Dido and Aeneas, Z. 626, Act III: No. 36, When I am Laid in Earth "Dido's Lament"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532764060ac95b7cc1cec0097b79540fd64b184c87ce461bd6162f3c5cd06d17. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302434 — a six-check JSON result.
Sempre Ricordo (Piano Concerto in A minor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a29b41bfbdb0bdf80875c3a8ae5e9e1c5d1a9ebd671682c85b59e1bdd157fdc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCLS0202009 — a six-check JSON result.
There's A Place (From The New World Symphony)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec70bce06f11d35a7ea4dc485074e583421c844507c78a5399fb208532d82b7. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCLS0202007 — a six-check JSON result.
Beyond Imagination (From A Midsummer Nights Dream)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98d2249c85a871b8247b7599d152a6e1696d4328411148642a5b83f96607f9b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCLS0202004 — a six-check JSON result.
Ebben?..Ne Andro Lontano (from La Wally)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444bb8a32fa718993aa62543cebaf1d2936ab9fd3dbd02cdd30d98ecc50d4c5b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCLS0202005 — a six-check JSON result.
You Live On in My Heart (From "Cinema Paradiso")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6648cb252f77e09c63d5a67465a37bab431db7aca4f0edce53e6cb3b70aa739. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCLS0202008 — a six-check JSON result.