The San Francisco Symphony Chorus is the resident Chorus of the San Francisco Symphony (SFS). Background Established in 1972 at the request of then-music director Seiji Ozawa, the chorus first perfor
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 0x72c7c2b39ba7585b61edf2d9717ba89b11da89222158d1f90d3947237126fa53. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6ff6876-115e-41c9-a738-67c8ad70a986.json and https://artists.proofprofile.net/proofs/artist/e6ff6876-115e-41c9-a738-67c8ad70a986.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Choral Music - Tavener, J. / Ligeti, G. / Debussy, C. / Badings, H. / Poulenc, F. / Rutti, C. / Thompson, R.
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 0xfe7d049d671c48cab8cdedf36f4c6bf2b8d18386bed8f725ae11cbb5c0852c08. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USASX0827013.
Symphony No. 9 in D Minor, Op. 125: IV. Presto - Allegro molto assai - Andante maestoso - Allegro energico, sempre ben marcato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d8b48d7f42387509ee950647b2f31a30049e7e5d13ad1da202969957c0625e. 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/ATEXZ1201045.
Peer Gynt, Op. 23: In The Hall Of The Mountain King
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6950d293e11b56b7c42240f3502d08473c3c3ffabfd58635bda5cccb556d36c. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508210103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfaaded40775b45396b814ecac59cec2e7bf24dfbc80abdfc951f98ef1a472c. 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/NLA508210107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59655fb2b99f53201e3decd65ba73eeceedbd93438f042382210a4711d8b992. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLA508210101.
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
Peer Gynt, Op. 23: Dance of the mountain king's daughter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35db4a848e8bc709671953b40ff60592c7cfc6f5f3b1c0d57ba19c3a09c15c7a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508210104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dc800039808e41b447e812334b917737d5c675500eccf9639b19590536830e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508210109.