LP Duo is a piano and electronic duo whose members are pianists, composers, and innovators Sonja Lončar and Andrija Pavlović based between Amsterdam and Belgrade. Formed as a traditional chamber ensem
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 0xc4f67c42587a391771169c99ea2a9f2604a321b86fdc8758b1f3869a0b299918. 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/60d2a502-b22f-4303-83e8-6a30e8a67314.json and https://artists.proofprofile.net/proofs/artist/60d2a502-b22f-4303-83e8-6a30e8a67314.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Music by the Composers from Serbia for Two Pianos
Nimani Rising (From The “A.I. Rising“ Soundtrack / End Title / Version For Two Pianos)
Lemon, Honey, Ginger - Unplugged (Pt. 2)
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 0xff48c6dce2347f505dc37072423de58f2f8f0bf8dcaba5b740a75da7ea0500fc. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/ATUM72000044.
Lemon, Honey, Ginger - Unplugged (Pt. 3)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa873f228b9ed5dd07393a269fd0c163eb8210dc7ff050d28d7e7b8250083e7d4. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/ATUM72000045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9827b53925e879a4d2c4281195b64fca320d33a22305b6907343e6c2381d2d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ATUM72000047.
Collapse - Ostinato for Leonid Šejka (Unplugged)
Collapse - Ostinato for Leonid Šejka - Unplugged / Live (Pt. 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479ddb61724c62402a641fc762faacc7aebe50b1a279810324770935b3ebcb11. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ATUM72100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c7ab55096ec5b092fbaba0ee696263a2fc42a539200239be26b1e80fd7ba85. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/ATUM72200187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4555c26b91f75410e486fa045ba0dff3a920ae7bb0f4012f5f228d8cd79178e6. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/ATUM72200188.
Deca zla (Music from the Original TV Series)
Good Morning, Mr. Correa - Unplugged / Live (Pt. 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4ced6a6667823039d3ab7f4f189abf4ed377bf44932fd7e178828e27f54073. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ATUM72100007.
Lemon, Honey, Ginger - Unplugged (Pt. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26b9b2903c14978a68d85cfa92dafb314b7e25b0a09758848df39a6f9561f26. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/ATUM72000043.
Good Morning, Mr. Correa - Unplugged / Live (Pt. 3)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c790f52dc6bfccd1f5d906a39b63af154f3d0094ad499639c803fcb0b8e42ab. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/ATUM72100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff48c6dce2347f505dc37072423de58f2f8f0bf8dcaba5b740a75da7ea0500fc. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ATUM72000044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9827b53925e879a4d2c4281195b64fca320d33a22305b6907343e6c2381d2d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ATUM72000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4d6a0daddb2e5920c361e10b9077ae1eaf029e58fd126fa0d34fcbae4f3c6e. 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/ATUM72000046.
Good Morning, Mr. Correa - Unplugged / Live (Pt. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff71f5451cb2abaf19a6d1a9d77d76dda3ec6cd458d4e84b9ddf2ca1583ac328. 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/ATUM72100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309bceaff47ff0c596be13e0a619965d8cca0d548c8628798340855ccdd09660. 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/ATUM71900143.