The Hotcha Trio was a harmonica ensemble from the Netherlands that made many records in the 1950s. It was formed in Rotterdam in the mid-1930s and dissolved in 1970.Vonks vondst: het Hotcha trio fro
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 0xe6f27d4edb7ee750febef737de772dbce58eb6649967205e1b26b79eb4b9cf4c. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9cf6fbdf-3271-4116-8321-c15a27bd556a.json and https://artists.proofprofile.net/proofs/artist/9cf6fbdf-3271-4116-8321-c15a27bd556a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vintage Jazz Nº23 - EPs Collectors "Three Harmonics And Rag"
Vintage Jazz Nº 68 - EPs Collectors, "Harmonics, Boogie, Rag And Blues"
Vintage Jazz Nº 39 - EPs Collectors, "Hotcha Trio With Rhythm Accompaniment"
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 0xf94039f4dec0c0c7f7e9b4f01d662ddb769fde51f912b2fabf436676ad58d142. 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/NLG620489894.