Elfride Trötschel (11 December 1913 – 20 June 1958) was a German operatic soprano; she was a versatile singer with a wide-ranging repertoire. She studied in her native Dresden with Sophie Kuhnau-Bern
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 0xee1f4d7abadd811d4ffa24e296ac928db9f578c77f3b49df967689d89720f415. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5627344-f6dc-4915-bdfa-c9883e31d186.json and https://artists.proofprofile.net/proofs/artist/b5627344-f6dc-4915-bdfa-c9883e31d186.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Bizet: Carmen, WD 31 (Sung in German) [Live]
Hoffmanns Erzählungen (Hoffmanns Tales) Sung in German
Hoffmanns Erzählungen: Prologue: Aus dem Becher kommt der Trunk
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 0xbf858226e6ac91f4d5c9db41c620755e69ebdcb6b6217de7c8e9cf9d213b4dcc. 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/USB8U1804598 — a six-check JSON result.
Hoffmanns Erzählungen, 2. Act Schöne Nacht, du Liebesnacht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99bda6c18e13588ccad7e7b4ade81f3d55d6d7a74dbcae5cb53fca876f3278c. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USB8U1804618 — a six-check JSON result.
Hoffmanns Erzählungen: He! Du da! Auf ein Wort, mein Sohn!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe4ff7de0218cf9012892a73eb600b219a24d2f4b645360b350fd4789c52759. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804599 — a six-check JSON result.
Hoffmanns Erzählungen: Es war einmal am Hofe von Eisenack
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6001f62bcc0c0b1dc9860c4295364f09b2020c9b742b5e3bed0751d168a32a. 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/USB8U1804602 — a six-check JSON result.
Hoffmanns Erzählungen: Pfui, dieses Bier ist abscheulich!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521dbcb773b0d6dae456cb48263a1b635e8088edd12a4e25df6d3620d74b98c0. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USB8U1804603 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f6fb475de869cd457ffcdbb559ed17f3b8c71f85114e057de643c7efd9cc8e. 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/USB8U1804604 — a six-check JSON result.
Dvořák: Rusalka, Op. 114, B. 203 (Sung in German)
Mozart: Idomeneo re di Creta, K. 366 (Sung in German) [Recorded 1954]
La traviata, Act I: "Libiamo ne'lieti" (Brindisi )
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a167f6f0f308cdbf754fad476adeae07ff3f5c7432cdae5351d5c99a922547. 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/USX760500017 — a six-check JSON result.
Madama Butterfly, Act I: Finale. Duet, "Vogliatemi bene"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2edadeb3cdf1a0f7f29c5690e91847fefbed0e2891669d6708f55b992af0f09. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/USZGD1900023 — a six-check JSON result.
Dokumente einer Sängerkarriere - Dietrich Fischer-Dieskau
O du mein holder Abendstern (Tannhäuser)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c644271264b300d1b98aeb99c58a7544f6a9572750b3219ddcf06391560428. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATP130645007 — a six-check JSON result.
Lebendige Vergangenheit - Lorenz Fehenberger
Chorszenen und Konzertchöre in Rundfunkaufnahmen ab 1938
Die Meistersinger von Nürnberg, WWV 96: Silentium! Silentium!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925beb334e4510324cb2cbbc05be3a76e9342f2860b61c9f887212bfc3032cbd. 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/DEAD61703101 — a six-check JSON result.
Lohengrin, WWV 75 (Highlights): Gesegnet soll sie schreiten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e7f7a947768f8ce3d4fb1abb602183bbe7ed51d6a799af45f385a2961c7276. 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/DEAD61703104 — a six-check JSON result.
Carmen, WD 31 (Highlights Sung in German): Diese Menge, im Gedrange!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004b915f359d5c4d95541434d2757870f19388669f5d230206090085b9b911cd. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEAD61703111 — a six-check JSON result.
Carmen, WD 31 (Highlights Sung in German): Habanera. Ja, die Liebe hat bunte Flügel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d756f56b604565583ad0754228a90a7a0e4f49e53cd1b027e8dab368545ee4. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/DEAD61703114 — a six-check JSON result.
Singers of the Century: Rudolf Schock — Arias & Scenes (Remastered 2017)
Weber: Der Freischütz (Semperoper Edition, Vol. 5) (1951)
Puccini: Madama Butterfly (Sung in German) [Recorded 1949]
Opera Arias (Soprano): Trotschel, Elfriede - Mozart, W.A. / Smetana, B. / Dvorak, A. / Tchaikovsky, P.I. (Legendary Singers, Vol. 4) (1949-1952)
Lebendige Vergangenheit - Elfriede Trötschel
Jetzt können wir´s nicht mehr ertragen (Der Widerspenstigen Zähmung)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4454385fe36af99cd016847fd44486b57ad32e9b09a5ec378b9453c1e0690ab0. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ATP139041620 — a six-check JSON result.
Bach, J.S.: St. Matthew Passion (Lehmann) (1949)
Dvorak, A.: Rusalka (Trotschel, H. Schindler, Keilberth) (1948) (Staatskapelle Dresden Edition, Vol. 6)
Hindemith, P.: Junge Magd (Die) / Toch, E.: Die Chinesische Flote (Staatskapelle Dresden Edition, Vol. 26)
Dvorak: Jacobin (The) [Opera] (Sung in German) (Staatskapelle Dresden Edition, Vol. 19)
Haydn, F.J.: Jahreszeiten (Die) (The Seasons) (Legendary Singers, Vol. 6) (Fricsay) (1952)
Weber, C.M. Von: Freischutz (Der) [Opera] (Staatskapelle Dresden Edition, Vol. 27)
Janacek, L.: Kat'A Kabanova (Sung in German) (E. Richter) (1949) (Staatskapelle Dresden Edition, Vol. 16)
Mahler: Symphony No. 4 in G Major & Kindertotenlieder
Brahms: Ein deutsches Requiem, Op. 45 (Live)
Christoph Willibald Gluck , Wolfgang Amadeus Mozart , Carl Maria Von Weber: Viva - Coro Dell' Opera Vol. 2
Flotow & Lortzing & Mozart & Weber: Va, Pensiero, Sull' Ali Dorate - Famous Opera Choirs Vol. 4