Vassilis Tsabropoulos (in Greek: Βασίλης Τσαμπρόπουλος) is a Greek pianist, conductor, and composer. Career Tsabropoulos's initial training was in classical piano. As a child prodigy, he won the UN
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 0x7bed0ef3f63cd3ad7e9343f944b7555f29bc52f64ba0ff74c811ed9fb5a88255. 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/f077773d-4b03-4e44-ac33-375752e14bed.json and https://artists.proofprofile.net/proofs/artist/f077773d-4b03-4e44-ac33-375752e14bed.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 0x19873fcea09abe44007b7556f7c94c650d69772cdfeff71bf2c32b37dbc5a40b. 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/DEB330704801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2b110fbff452d189e0c752e6fdbb75d84b1de16e83c2f2c997025be180a432. 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/DEB330704802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3acce54885aa426ad935278df8c3a617bc377b8add9b4e431e41f953e4d381f. 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/DEB330704803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9974d7bf63dd3f7ccf47cae53209ceaf8dcab0654fa0d34ad87ae59b486cd737. 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/DEB330704804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be116f0988ca70d45eee84ac4e77288defe9108d3b4f8df869a987ae5ec0244. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DEB330704805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd3d9d42714d2f33727a62d1ce4d504f94f640273b4c002475184c54d4d924a. 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/DEB330704806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a84b4f83753aac215227f2e378799d771bbc615fa8d379a567e6694a399c35. 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/DEB330704807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2496cc783649807fad06e3ff12a69e898b6d3609fab4678b68d3403324085881. 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/DEB330704808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa7b5f197233560730a182847185cfdbed37843da27924a41765266d9b6fed8. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/DEB330704809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2d5ad9239756756b3d90a7269a91ed4dde7e33fcdbfa1f5a50e18704964ab6. 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/DEB330704810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3fe756eebd5b1594ce83120208b1a7b96f09dc0a8e4a84cc971976122949cc. 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/DEB330704811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec80d34142263a306ba95c8d7ede8122239d218e6dd5b990eb88f627318ad7c7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEB330704812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6773e4d0c6f4400e1343dcbd56bbf47b597fecfa2d9fb068789b5278338b146. 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/DEB330704813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ea78e3f81919a81ba0b1290e37e47a9fea1d4fc68e8a8d4e9c5b2ebe9901d7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEB330704814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b4fcdadbae0017ed5308927fbad8853a350006d03a5e578d7cd00138d971d4. 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/DEB330704815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a3bba8fb615d0c50ebb0105380544efe12a950ec378a22d3a7498faa36e197. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/DEB330808102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79705100a1b49f89bd0a79c8f6d1b0396ca42ab4ddea0d54b9c2b488e5a00de3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEB330808103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609ff42898ef5ade5c411a196b4a1a68e7f033d53418b40b36c2848db25a0972. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/FR6V82126346.
Skyscape (feat. Spyros Panagiotopoulos, Takis Paterelis, Thymios Papadopoulos, Yiannis Ekmektsoglou, Apostolis Anthimos, Stelios Zachariou, Vangelis Katsoulis, Savas Christodoulou)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007d51aaae910d790bd9d09b4da3b8a742fcc2857f36ac427614994d32d12819. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QMFME1543663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a73994bd5164f02e8661f08bf22c660b680d16205fdb5382b3f68e0ac840aa5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMFME1543664.
Gurdjieff, Tsabropoulos: Chants, Hymns And Dances
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f681db69293f83a9296bf1a479bca59c4712f0d1dfead7d0f1b079941fb67e. 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/DEB330388801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aae4d9803ef6ef0db3d112327bb2ae318ee13acb5894c86e0a6cacc4b95811f. 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/DEB330388802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452015288125ac9cb4601264c034b63e8e6e1a2d128b102c80ecf95b1f89046e. 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/DEB330388803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e0fcc81c53675cead42b339edfe76bfe0a001ba2f17f0c1f7162e5868d9c6f. 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/DEB330388804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cd47f23b779deb7d51137550febe4c7d166aa3b4ae75f2fa98dd2a457c8c02. 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/DEB330388805.