Berit Maria Lindholm (; 18 October 1934 – 12 August 2023) was a Swedish dramatic soprano. She was first based at the Royal Swedish Opera and made an international career, performing at the Royal Opera
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 0x63b2d0c5a7a41f4ff3fdef1e1e7df516bb429d37758daa412f91f17aec2d025a. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/330a250d-b15c-4c0f-9010-51c4748033ee.json and https://artists.proofprofile.net/proofs/artist/330a250d-b15c-4c0f-9010-51c4748033ee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Les Troyens / Act 1: No. 1 Choeur de la populace troyenne: "Ha! Ha! Après dix ans"
Chorus of the Royal Opera House, Covent Garden
Orchestra of the Royal Opera House, Covent Garden
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 0xc44b19ee38c66a882bfc76a1488e8f835f44d11904e5319505c6e1942d057e4b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506900560.
Les Troyens / Act 5: No. 38 Chanson d'Hylas: "Vallon sonore"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09648992109d38a9a426eb6eed8c1e9bb238a85a77500fd1a7ae1e400b51703. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLA506900599.
Les Troyens / Act 1: "Chorèbe..." - No. 3 Duo: "C'est lui!" - "Quitte-nous dès ce soir"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8f089a44ca2c5d3cb7c2677dc945fff74e4643f331423b98f109e51a93eba8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506900562.
Les Troyens / Act 1: No. 5 Combat de ceste - Pas de lutteurs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8783594b64b249ffb96643a788445a4e6e3a6f402c85078bb04f72081894dc0f. 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/NLA506900564.
Les Troyens / Act 5: No. 45 Scène: "Va, ma soeur, l'implorer"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a94e7fb81134be1f95ce05552a7e825d5d1eda1124b363cae5f111abe26882. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506900606.
Les Troyens / Act 1: No. 11 Final: Marche troyenne: "De mes sens éperdus..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe1e77f51dbc24beb59308c88feb1477b7e35d8324019baeb0f9108c97ee273. 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/NLA506900570.
Les Troyens / Act 1: No. 2 Récitatif et air: "Les Grecs ont disparu" - "Malheureux roi!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54f67457ec2a94fb239e0aae77bf7b8019c04e8ae4db8b0c6cad936cfbb4d13. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506900561.
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
Les Troyens / Act 2: No. 16 Final: "Complices de sa gloire" - "Le trésor! le trésor!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374e2f9441a09043579c3719fc7d4b1e0f772b8a020f38b5261646489add4731. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLA506900575.
Les Troyens / Act 1: No. 8 Ottetto et double choeur: "Châtiment effroyable!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfbf879473342847c4e18197f4a88b924d05f427d305f97e10e72bc4ce48313. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLA506900567.
Die Walküre, WWV 86B / Act III: Hojotoho! Heiaha! - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff8abdb5137ca9596c91bb4e458e95b74ed0ad965a20f1d9345a1d1c5267e16. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2200542.
Die Walküre, WWV 86B / Act III: Nicht sehre dich Sorge um mich - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e249543ce7266f97f577092d3996cf43206b0d21e2c9e43f0bd6715f795453. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBBBC2200544.
Die Walküre, WWV 86B / Act III: Wo ist Brünnhild', wo die Verbrecherin? - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd866ad35d82255455afa617c730cadd5ae42b33781ae36bbeac6923b46a14029. 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/GBBBC2200546.
Die Walküre, WWV 86B / Act III: Wehe! Weh! Schwester, ach Schwester! - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d950005e099e00a373ed38879ec32afd462273f4f68454c0e524d920705f2de. 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/GBBBC2200548.
Die Walküre, WWV 86B / Act 3: "Hojotoho! Hojotoho!"...Ride Of The Valkyries
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9945b7540923c7a46a621a73daffbb7293871ceeec753bdf7c710be3e88bdf6. 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/GBF076510261.
Die Walküre, WWV 86B / Act III: Schützt mich und helft in höchster Not - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1f2af5f82a582cea9bee06dbefe1cde61c065ec4788f50a585f65d1f229b86. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBBBC2200543.
Die Walküre, WWV 86B / Act III: Steh, Brünnhild' - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00fa48b2ca2476890db4f7748099bf4fd2c6af2354f1a1323f82b650d6abb3b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2200545.