Jacopo Lazzarini (born 22 August 1994), known professionally as Lazza, is an Italian rapper and record producer. Biography Lazzarini was born in Milan, more precisely in the Calvairate district whi
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 0x50f6d26c334c5bdc0632771458e4be3b519a02dd1435b6f1929c0147fc88b7c8. 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/283ab5fe-58ad-44e5-b750-bcb957b7316d.json and https://artists.proofprofile.net/proofs/artist/283ab5fe-58ad-44e5-b750-bcb957b7316d.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 0x7e20ac31fc7d761539dd91eb2ac99fe19a9ef59fc7564b996c3e33c1f7c8838f. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/BXFKW2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bcdf927f7a20765db01e8a6604ba8d5d93060726aa7583500e0c47a39dbefa. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BXFKW2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8b920e807704de72e9500cff0f31380431efa946adc1afcc380125d9273454. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BXFKW2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74ee62a3435e92238d9fc4ba212511a140e4186eef63f7b7d462f010c8820db. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/BXFKW2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb2bfa3cf77d3c390141ca8a652d62db6a6771604960cdcd61953deb9ffa38f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BXFKW2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5516968cca5c192e55cdec1a472c0a7a1f59bb65601650be7f081b46705861f3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/BXFKW2400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364d1a51d70386393965f76b5c17defc71798cad5066c4b0daba0e806b6e4fb7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BXFKW2400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c008f2866b96d6c35af25d133236d8e75046a18e216c552ba6dd610363fe445. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/BXFKW2400059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6110e07d35ea3f588bb007b9ac655402047b27f96a9013c6dafc284f9fa570. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZZ8B2379732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de43354e1fa02a84db4fee9a05e7a2f665882db9e0d93257cbc420c969abd92. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXFKW2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e1c9a22e4dfdbc16d2d24468f0435fa3405630fc85a1377021413575db075a. 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/BKM2L2400450.