Michel Petrossian (born 1973) is a French-Armenian composer of classical music. Career Born in Yerevan, Armenia, Petrossian studied cello and guitar and then studied composition at the Conservatoire
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 0xe273d756d4f9fadd90bdbc2cf43d91e2ca0c1e45114ee8c62c65f02e3c89ccf7. 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/3305bd0c-4108-4092-8eb0-ea0a75e3adff.json and https://artists.proofprofile.net/proofs/artist/3305bd0c-4108-4092-8eb0-ea0a75e3adff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
En fanfare (The Marching Band) (Bande Originale du Film)
Valse pour Thibaut - version orchestre symphonique
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 0x90052110d383b367f828cc87888740f534917cf2a273d9a100a180ffbf912fa4. 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/GBMEZ2455956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe071aacaf9d42631e65b5c083831f74b31d1d11d3b6add66ae868c88de13022. 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/GBMEZ2455957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17083ba5386a0464312c94f7bdf202974408d30c01e5f18bc1d7a102ed85e25c. 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/GBMEZ2455958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bd269e2643d725e8297f5983041ac472386a52f7afac84c6c3ac433774caf5. 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/GBMEZ2455959.
Concerto pour piano n°23 en La Majeur, K. 488 - 2e mouvement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01147c7608f66003168a14a548d4e3748d97c4fcb93ff843bb237e7bb0ae4d04. 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/GBMEZ2455960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd93e96b4acd8efee831d8d57db7966030ab8ed48fbb8ba7803e43f193447214. 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/GBMEZ2455961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2ad862ef00f6549894f8608dd9f2034c6933bc243431a43f418e14cf1fc2e7. 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/GBMEZ2455962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1bed011945a8131109f9994c2404cab4bc5d124f2b5dbfadcf61e6a4b2376fe. 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/GBMEZ2455963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f1ae2f8ff6e62bd96ec611189c19b3202f20c7d8955fa03c45add6dc60c356. 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/GBMEZ2455964.
Valse pour Thibaut - version orchestre d'harmonie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20899d4958c00d82514074a79ca74d962709d47c347b826e1ff04efaf686a813. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBMEZ2455965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ff2f0785e9e8d1d7bce54a10f679c2160c70a2b6d7ca088e5f17f90e0474aa. 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/GBMEZ2455966.
La pie voleuse (Bande Originale du Film)
Et la fête continue ! (And the Party Goes On) (Bande Originale du Film)
Temps qui passe 1, yézidi - Le pas fleurit de lumière
Sept, les anges de Sinjar (Premier enregistrement mondial)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80abcbb8e8ec18714c785e6d4a78ac288fcd745b2f6a89eea58eace09e715986. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1A92104718.
L'ange Dardaïl (lundi) - "L'alphabet tempéré" pour violoncelle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0715ffb758cbf333cee63dceff49932093cf7aa2865d69d1f085bdb4e8e943. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FR1A92104728.
8.4, concerto for cello and orchestra: 1. Massis
Armenian National Philharmonic Orchestra
Armenian Cello Concertos - Past Meets Present
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6bb599924c4358b4f84648de804d0bc298b249915e0a2e9b87188ee80dff57. 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/SEAEC2248070.