Abigail Fischer is an American mezzo-soprano. Fischer is known for her commitment to contemporary music, having premiered works by composers Missy Mazzoli, John Zorn, Nico Muhly and Elliot Carter. S
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 0x8013b20494596077453acdd042283c85d8cc1b88e0fb3c9124e34dc688a928f7. 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/76b1b90c-821e-4e52-9813-ae2b1a97b1c7.json and https://artists.proofprofile.net/proofs/artist/76b1b90c-821e-4e52-9813-ae2b1a97b1c7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Missa in Angustiis "Lord Nelson Mass": I. Kyrie
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 0xaddae9542e0321f8149a8e884a4e066fea137dd993924cef69eb47067d9f31ad. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342601.
Missa in Angustiis "Lord Nelson Mass": II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e3fdae51f7f2d9cd0746c48fdf5549b7eba839fa870be449646111413817e4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342602.
Missa in Angustiis "Lord Nelson Mass": III. Qui tollis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc6eab518271c6ca190ac2c880894e28b985695ecf30e2fbc4d3f1a6d9f630f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342603.
Missa in Angustiis "Lord Nelson Mass": IV. Quoniam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fbfb560f92e8ae207db191c021fe638f22f5a6533cf60dc4c38d6072bec1ee. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342604.
Missa in Angustiis "Lord Nelson Mass": V. Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabc33045ed6b223c3d41f8e7a0d4d96a3666256601fe1268e60253af6697a12. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342605.
Missa in Angustiis "Lord Nelson Mass": VI. Et incarnatus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb83f0c5bfa0ff4a9aba6c151d12cf3102a6eb5390da60a924d70573a32d0cfd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342606.
Missa in Angustiis "Lord Nelson Mass": VII. Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa817df13b3ea32addf24e11b0d4333fddd91f5e0c33fd226f6a01c82274c50aa. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBASH1342607.
Missa in Angustiis "Lord Nelson Mass": VIII. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb597586a3a6fc40e18128d64f385c9f915909eb48d113eb4ee5b73257e2e8a8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342608.
Missa in Angustiis "Lord Nelson Mass": IX. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48a43382c6e1336b4d06313750a4a3bda273c821d5e6b714341ddbe42ce592b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBASH1342609.
Missa in Angustiis "Lord Nelson Mass": X. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323f94b42d086dbcb2ee61347c42dc723a3eba1f159f8c3b0a4be462864d82f7. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342610.
Missa in Angustiis "Lord Nelson Mass": XI. Dona nobis pacem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6b107e8eda9a25b0472069564ef5cdf2c79bd1fc8f17cbabad254affc478f6. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH1342611.
Symphony No. 102 in B-Flat Major: I. Largo - Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68cd409ff769accf47a5bb5b6dc6f9adb9db3368648acc6484ea286ddffcb07. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBASH1342612.
Symphony No. 102 in B-Flat Major: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8e996da848425565de4ed2e0311fdbc2b474ce7ad92c4374f132ada837bd15. 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/GBASH1342613.
Symphony No. 102 in B-Flat Major: III. Menuetto - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b36034770959ba3c0c35ba4897e1b01496394607087d0347bc13ff1cfb1cc4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBASH1342614.
Symphony No. 102 in B-Flat Major: IV. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d8986f0e47a65df7f698d6bca99e3bbbf7e8e8e9829c15dae524210f21b76c. 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/GBASH1342615.
Harold Meltzer: Variations on a Summer Day and Piano Quartet