Ducu Bertzi (; born September 21, 1955, Sighetu Marmației) is a Romanian folk musician. His songs are usually his own compositions, but he also has in his repertoire some Romanian folk songs. Life Un
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 0x87cda20cfa47d5cb9f33d6b80ac427df8b51ff91c76dcb920c292c49484664bc. 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/710c2cf9-203a-4070-ab6d-7417e200b1e9.json and https://artists.proofprofile.net/proofs/artist/710c2cf9-203a-4070-ab6d-7417e200b1e9.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 0x5f7b6cf8e6c8121bf62aadd90b09cdf7dad7bb91c3b510a7ac282077fc42eade. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/ROCMA0600027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa71595a58651f02c793c1d997bae7efcecd1e417938ec127d68cebd8238b0ac. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/ROCMA0600038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8306f56aa7ec492d5f01cd1fda95c8c4c63b7e77272de758ae39076316929471. 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/USA560609474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1dc094bb0c30b4600b675d44951f604dbb12147dd00bd659c020fcb0b7ef8b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USA560609478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d439ccfbfb40acfcdb709cb3c1603fcf62ca1830de3affae757d6c5f0e2c36. 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/USA560609480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedcaabba4587a96cf7143e0240f5e73af636a125929cdfde9f7b4aafb524c09. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ROROT0909707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717d24250561524b424910d9f5cf582e1991c78ec0f2bf66660e2d78132dda00. 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/ROIMA9700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d90ca3b1cd6625c3211cdb2baee3af06f95b5d203b07eb3389b59eb830f445a. 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/ROIMA9700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bb30b2b527c4e26bc448e01b23cc4a8ad7ee9c7d250f81f990196706cba5b1. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ROIMA9700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48cb58d81d618bf2132f1d6ab131c7c64c3ed804ace07058b537e54db3ed1aa5. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/ROIMA9700015.