Tre Voci is a professional classical music trio made up of flutist Marina Piccinini, violist Kim Kashkashian, and harpist Sivan Magen. The ensemble was formed after Piccinini, Kashkashian, and Magen f
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 0x9d1ef3055a9a9adca298b28b9e98c00a0a830cf3487d5e63cbe5ab312de5b1fa. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c26a977b-b4c9-455b-b235-32ec40fc0950.json and https://artists.proofprofile.net/proofs/artist/c26a977b-b4c9-455b-b235-32ec40fc0950.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa4623009c0c144662bbe1463de7ab7419b3e97e3550762e8d7510f8cd5fbb3. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/PLB172000310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86e1f99190d472065c1808d71e95f97ed2cfdb6a11d5a65834774b88d6e86fc. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/PLB172000315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8024d37c5d9dcf00a00ea799b7cb546709206eea2b7b0dd74323c401d5574cb3. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/PLB172000318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe322a9dba4fa2524980fd7d1af8479bd2b608a98d13f3177f6d3e0c5a02cab6d. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/PLB172000319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6cb539d677c49a1e38c2f82d0c267abcc15e960220ff552590afd983e7d672. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/PLB172000320.
Hallelujah (The One-Year Anniversary of the War on Ukraine)