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 0xc3a2221fb58185f12d3f91266a282ab502969db5f48919249df7c92d03209073. 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/f0b9fbd3-83c6-407d-a81a-90ded46d9ef4.json and https://artists.proofprofile.net/proofs/artist/f0b9fbd3-83c6-407d-a81a-90ded46d9ef4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Schubert: Masses Nos. 2 And 4/Deutsche Messe
Mass No. 4 in C Major, Op. 48, D. 452: Kyrie
Schubert, F.: Masses Nos. 2 and 4 / Deutsche Messe
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 0x00a4a07a8af7d5cb9478cf327ee9d518e4a1d54090bf6e99670ff71ba5b98d5a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190891701 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5988946f51c1d0d9c77240bc814a3b6448393ce328f61dddcb6c6caee7129e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKI190891702 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Credo: Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb248c0a94b58b06cde329f8dcd61da1c598c2602b585451244bd2aae17454c. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190891703 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Credo: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a41f2fc6f4ad76c488f3b157c1b8aacb0b6b260df7bdd9d1e1c4f949495c032. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190891704 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Credo: Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b5c31dee587700fd712705c438dbc2b4acdd090d13ad45f285a1ae61e0f24c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKI190891705 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Sanctus: Sanctus, sanctus, sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f955dccc919b40b3a4510bcaaf838a2da79cad5ebf8f7fd03b729434cf3bbdc. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKI190891706 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Sanctus: Osanna in excelsis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe575382810c6b12ceaf43306710cb69860e254aa1a76fefaaf059bb8ccc4fa19. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/HKI190891707 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1286cba325f3eaac9ea1df161ae72ce577423fe60e72c008cb19a27298af09bb. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/HKI190891708 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Agnus Dei: Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd124ce7399bba31232c90e1eb90e1fa385bfca2b8b70b9eb23c01e05059ad107. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190891709 — a six-check JSON result.
Mass No. 4 in C Major, Op. 48, D. 452: Agnus Dei: Dona nobis pacem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51af51dc3ce6a8d935e042de05fbf5d31aefac5660dcb19219cbd1da7c8c2938. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190891710 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Kyrie
Schubert: Mass No. 6 in E-Flat Major / Stabat Mater
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bab14f238ade1cc6dc00e6e0b11d15d90d0415faeb78d583b31bd266832f30. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190730201 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Gloria: Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c991f96443bb727de53ed958b1498cf6757b07d9402fd6410a3c3ae684758d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKI190730202 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Gloria: Domine Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea8777527e25c3299f5a6580ce611e8e30a041fa4a3c9b78c92f498fcb6bf47. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKI190730203 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Gloria: Quoniam tu solus sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08e79d0f2cf3762362dd27ee2eb90aba221dcc7a76eaa4ab1b2221a58557f83. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/HKI190730204 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Gloria: Cum Sancto Spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41bf254e00be04183516055d062c9fd9e52e1525db5a795e66ce876e5d4805c7. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/HKI190730205 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Credo: Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddc5795f261be0d891a90400b864c0ef49e177ee0a659da22e5916ceb0ed41e. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/HKI190730206 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Credo: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaeaa1893712d3cae227aef689580778dcf4c66fb83fbcfaa3cde6e09d2f6b8b. 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/HKI190730207 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Credo: Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29a9679628556a9e6fe176cec801be3c397af787abc42e70bc4570841fbddf4. 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/HKI190730208 — a six-check JSON result.