Maria Fiselier (born 17 April 1988) is a Dutch mezzo-soprano. Biography Fiselier graduated from the Royal Conservatory in The Hague in 2013 with the distinction 'Artistry and integrity in performin
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 0x767480c633bbe2bfc48e7c11ec530f22dbfc27ed40eb4ecfb412e26ca241ebbd. 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/318790c1-993d-467c-b22a-2d85ef3b708b.json and https://artists.proofprofile.net/proofs/artist/318790c1-993d-467c-b22a-2d85ef3b708b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x4ba64a34bc602c21dab8e4cf723dba6d1abd14779fbcb89c54698c5df9bb7f8b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLSU32200122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d74cedc6c9fdaba47594fba6706e16cab522607a1afb3d5cf065e9c53e1357a. 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/NLSU32200123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834d6e73b07d08450cd806505c1a39debea0e1def3d5b878a9c9d3bb8b8f2c90. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLSU32200124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afc863bdc31f767fdbfd2981fd6ab9727c5d78bdab8b777e528e1dec3439544. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLSU32200125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e77e841cc1c014c49630e21d0aa0cdf7cf280d6f475a5ae1f1f509b50e1d61. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU32200126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e8072cb0efed35146c3bc28fb4f2e8fbf10f706928c5df5c39b1edf8016416. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU32200127.
Les Bienveillantes, Air: max wie hast du schlafen können
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1bede9c88a3229c0545cc671377cfed5b8043351ad39674e35dcbe70eaa7e1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7f370062f38aa62bbf009012f14f898e09a32337366e655898a506ea9b1b39. 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/NLSU31800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf349212fd77744e2da0e0a01387fe1c91c149fd46fc25f31afa0d62b0cc2e55f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800043.
Beste Zangers Seizoen 11 (Aflevering 8 - Duetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdc3894890e530b1968a3fc0b7eaa837586a46717fb724f196cbb07c057ca4c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79af06fbad6f6a6c88672d0cf23b4ce1f0c3cb66464576b51f8f65b235fbb124. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLSU31800046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff986e465010d1512c8932ff4b817ac7e557a7c54b593f60883f5e1e57db773. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800048.
Beste Zangers Seizoen 11 (Aflevering 5 - Hoofdartiest Glen Faria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084446d559a0b5392c1e686e60ae06f1f5ede7bec1cd80699cee3646eef3bf64. 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/NLSU31800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b622ddcf55f19b67ad2a1338023776b37c8bb838cf5543e08c7eee3a6f783a6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2533ccc07174bef025974726176aedc0c1606425fe4bf89d01a52b26ffafd0a4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLSU31800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397afae3ceff64a6770f0d8f9b8892236c77c6081a4dd077fe1d2d3cfabb652c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800035.
Beste Zangers Seizoen 11 (Aflevering 1 - Hoofdartiest Lee Towers)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe5a9d3d00bc965d6a7138739841e4141e58029a5a3be2fa6adb39ea5296f6b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3a67f6d4d0f8254134d553bc47a96794765065ed72c4725a716cf52bac0e68. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800012.
Beste Zangers Seizoen 11 (Aflevering 4 - Hoofdartiest Davina Michelle)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12949937f7f7eaea2a04ae278c3acdd55ddff28c5a44c75e6ea5924633b340d7. 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/NLSU31800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbdb5b86834ee0b1b68b05e29a10fddbc9e6e3a20da3e86861add35e8195471. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:03:05Z), 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/NLSU31800028.
Beste Zangers Seizoen 11 (Aflevering 3 - Hoofdartiest Tino Martin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7f370062f38aa62bbf009012f14f898e09a32337366e655898a506ea9b1b39. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecbbcd35ae60fb7069b9aa7d93734190dbb33c6fa275ab1e09316c973b52d6d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79af06fbad6f6a6c88672d0cf23b4ce1f0c3cb66464576b51f8f65b235fbb124. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800046.
Beste Zangers Seizoen 11 (Aflevering 7 - Hoofdartiest Alain Clark)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc9de8aaaeb09fad52c75677c075aa362850ebbbcb36257166c36c5eaedc900. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800041.
Beste Zangers Seizoen 11 (Aflevering 2 - Hoofdartiest Trijntje Oosterhuis)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddf264d574efaf86ccffa22819d24f507d3c68e557e1d097106f4c11e6bda7d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397afae3ceff64a6770f0d8f9b8892236c77c6081a4dd077fe1d2d3cfabb652c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSU31800035.