Jan Antonín Losy, Count of Losinthal (German: Johann Anton Losy von Losinthal); also known as Comte d'Logy (Losi or Lozi), (c. 1650His year of birth is approximate based on the parish record of his de
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 0xebddcb800e80798a7f128d9b4a18f3b1c13e2c623ab4dcd57f886b1699132c98. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5423033-1334-40f7-afaa-9a59d0102460.json and https://artists.proofprofile.net/proofs/artist/a5423033-1334-40f7-afaa-9a59d0102460.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 0xaec128a2895456951a551ac9896212c7b4b8fd4c1b41226d2553f09eeaf9e789. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA1962010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf05ddfcd00225cecbf1b1aafe8f6beb95c7b050665ba35ba3585cdc948e65d. 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/SEAEA1962020.
Lute Suite in A Minor: III. Courante - Double
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdc1e0366030417343a08b925856deb4c766831c4ab271b01b0291ad7d13873. 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/SEAEA1962030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f932f5e877e6fb97af63bf17f07684a84079734830db6addf4a41d88b129ea. 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/SEAEA1962080.
Lute Suite in B-Flat Major: II. Courante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664c64c3c536a0f38cafbd65d81e2a0dfe6c88c912bf502fa69f98e26e8248bb. 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/SEAEA1962330.
Losy: Concertus in A Major / VI. Menuet – VII. Passepied – VIII. Menuet
Losy, Weiss: Lute Music in Prague & Vienna Circa 1700. Music from Eighteenth-Century Prague