Alessandro Michele "Sandro" Cavazza (; born 11 September 1992) is a Swedish singer-songwriter of Italian origin. Besides his solo career he was also a member of the pop group Estraden. He names his m
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 0x22c962ebb20e19ff313a5d532fdef731f9e6d84ebce084edf504989234e097d0. 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/2a7ad1d4-f3b9-49b3-b1e1-ac62e14ef929.json and https://artists.proofprofile.net/proofs/artist/2a7ad1d4-f3b9-49b3-b1e1-ac62e14ef929.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 0x719be3cb5a4977d82f6e95c01a02acb4e6bf7f580865358151df60a9da4f34d4. 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/SEUM71901489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3464b1c747c32aaf76280926e4c45141248bd1d286e8acfcdf9f0f6dba7965d. 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/SE5R71700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb342fe19bd9a0c325f9bfb18d218dcbca183dc126db17eb550a432ce9f94be. 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/SE5R71700106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe27896a2e492f2418d3bd628654860f1e45e461f47fc73302e7bd054a2bedad. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/SE5R71700133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3999995425593acbfe92f53b9fb88bf1da35b50233878131707f050d39d7c3f2. 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/SEBGA2000409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283289b3aae573bcd134f500b3e060c81447090100b8c646ee6a3fdf3e749665. 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/SE5R71700132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aeabb0b2e926c101cd70debbfe12549100695cfd20865c291ec9c069e97daf3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE5R71700135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860efd60c226a9f6985279fb50ec99ae062f3f4d144884d76686ac9ca90907ed. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE5R71700140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6122cfbe18c791f187429ad5ffa0d1bdcbf00d78aa57bc99604bd83af4524bd1. 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/SE5R71700134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3464b1c747c32aaf76280926e4c45141248bd1d286e8acfcdf9f0f6dba7965d. 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/SE5R71700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76849c0919a7e7ea8805a922f221e312476c79846021a7ce2c777297084b0d14. 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/DEUM72305198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5a4805056c440e446ee21c1d782c895323a4d40268dd7a3d5b225c53d98e82. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEUM72307443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76849c0919a7e7ea8805a922f221e312476c79846021a7ce2c777297084b0d14. 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/DEUM72305198.