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 0x819ea0f4cd802b79a7715f50cb449439a437620a8d19334e3c93cd1a9402ce47. 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/52d03bbb-702c-4bad-91ff-da5ab365013d.json and https://artists.proofprofile.net/proofs/artist/52d03bbb-702c-4bad-91ff-da5ab365013d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Schubert: Symphony No. 2 in B-Flat Major, D. 125 (Live)
Piano Concerto No. 14 in E-Flat Major, K. 449 (Live)
Piano Concerto No. 14 in E-Flat Major, K. 449: II. Andantino - Live
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 0xc74ce0b70d9f6a72019b746665f8b12f74db90d875e5df71421cac92674860c2. 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/ITD542200142 — a six-check JSON result.
Mozart: Symphony No. 1 in E-Flat Major, K. 16 (Live)
Symphony No. 1 in E-Flat Major, K. 16: I. Allegro molto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d220372182a5f5e0334c265bc26970d02914676cc93c444c2b60ce1444759eb. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ITD542200138 — a six-check JSON result.
Symphony No. 1 in E-Flat Major, K. 16: II. Andante - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01107d090cb0a3dabf88d14712f190889b0328e344d576ae01a161e87e6efef. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/ITD542200139 — a six-check JSON result.
Symphony No. 1 in E-Flat Major, K. 16: III. Presto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf151ba37dabac86a559ed2feb24e64bfd618394da12038cbf50d3e1c91d8af2c. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/ITD542200140 — a six-check JSON result.
Symphony No. 45 in F-Sharp Minor "Farewell": IV. Finale. Presto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9a1a4fe91fe87469a3a48af7c099b6799116bdd36ac3985d675b7f60aaaccd. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ITD542200099 — a six-check JSON result.
Mozart: Piano Concertos Nos. 9, 20, 23 & 27 (Live)
Piano Concerto No. 9 in E-Flat Major, K. 271: I. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0f74e2be0af654eb2980eac272026b4ed28b4c453dc18476dbf58f11f48881. 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/ITD542400119 — a six-check JSON result.
Piano Concerto No. 9 in E-Flat Major, K. 271: II. Andantino - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d8241ab7ce4b66b54490aad18b3d58db957aab8304336032c41fc1b6f58c24. 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/ITD542400120 — a six-check JSON result.
Piano Concerto No. 9 in E-Flat Major, K. 271: III. Rondeau. Presto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa228127a14d32837481863ec9b04043c0d0e6ac744bd5fadaae3f9aeab456a2d. 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/ITD542400121 — a six-check JSON result.
Piano Concerto No. 20 in D Major, K. 466: I. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c138cd9d94e8f4ea4de73d2d39ed7f4df7e59e2b56c3f6633501f935c91140c. 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/ITD542400122 — a six-check JSON result.
Piano Concerto No. 20 in D Minor, K. 466: II. Andante - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa631f0dcd63a179c7bf2d61bb63987f7baa4c9d227debccf86c63fb37920c43b. 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/ITD542400123 — a six-check JSON result.
Piano Concerto No. 20 in D Minor, K. 466: III. Allegro assai - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fc80fdb2c541b8ecb874feffc19d232207b2d47448d2117fc684e8e68884e9. 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/ITD542400124 — a six-check JSON result.
Piano Concerto No. 23 in A Major, K. 488: I. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04ee4b129a491b5bc6a930b1777b112c304476bbdab6be1c33db0bbb8782c9a. 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/ITD542400125 — a six-check JSON result.
Piano Concerto No. 23 in A Major, K. 488: II. Adagio - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c7d3803950f5b2f7bb2802f61f1dc350ddcd54656acce9813096a8ae7d4ae5. 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/ITD542400126 — a six-check JSON result.
Piano Concerto No. 23 in A Major, K. 488: III. Allegro assai - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333aee4ce426b091b019e1e6a01d6c2afc0ac24ac42d6fd97355c51177043cd7. 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/ITD542400127 — a six-check JSON result.
Piano Concerto No. 27 in B-Flat Major, K. 595: I. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11b26b05edf13f63ad2ff5123db8172b100e9a0fdef0f3892e51a0b6289c0e1. 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/ITD542400128 — a six-check JSON result.
Piano Concerto No. 27 in B-Flat Major, K. 595: II. Larghetto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f14875ca49d68d6174c3eb749e614346304d93825f7f266a5a7e9ec3a0b1cf. 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/ITD542400129 — a six-check JSON result.
Piano Concerto No. 27 in B-Flat Major, K. 595: III. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26db3d1abb6265a34d1264fe979094bbfe836cd0be43975df4de80177494bf69. 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/ITD542400130 — a six-check JSON result.