The Kungsbacka Piano Trio is a Swedish classical chamber music ensemble. Biography and career The Kungsbacka Piano Trio was founded in 1997, and is named after the Swedish town where it first perfo
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 0x4aab77d972f3f51dfb0556b1b9b2598f61d67850ed771e992ead54bc43face6a. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ea76e5b-6cbc-489d-af0e-49a833ac68d4.json and https://artists.proofprofile.net/proofs/artist/1ea76e5b-6cbc-489d-af0e-49a833ac68d4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pavane, Op. 50 (Arr. H. Busser for Piano Trio)
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 0xb5653dc0bdd20d7b42cf3afd283dd985ef24844e517a8a06398599ba03e9ca6d. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/HKI191224908.
Piano Trio No. 2 in E-Flat Major, D. 929: II. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdbae7955fd722cfc7fed284302c813313fcc0c0cccbe087ef40231bc547758. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI190154102.
Keyboard Trio No. 25 in G Major, Hob.XV:25, "Gypsy Rondo": I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5365c85e99185d647decb77fe2ce822ff45114f094a544fbc7454793ae92eb1. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKI191036307.
Keyboard Trio No. 25 in G Major, Hob.XV:25, "Gypsy Rondo": II. Poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3402be4ae3b301a07e67a5a65248415ae51c9f6561cc9a66a55f2daf28817f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/HKI191036308.
Keyboard Trio No. 25 in G Major, Hob.XV:25, "Gypsy Rondo": III. Rondo all'Ongarese: Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c42abda15cfd1ba1f87a83500a57d4a827c76ac1df9ce9529dfb3b044b180f6. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/HKI191036309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5653dc0bdd20d7b42cf3afd283dd985ef24844e517a8a06398599ba03e9ca6d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKI191224908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fab494e83c920d085db946068e06f020479a61e36e63695268b7a1047638bb. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/HKI191029207.
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