thumb| Petru Guelfucci (Born 6 March 1955 in Sermano and died in 8 October 2021 at Marseille) was a Corsican singer. He is widely recognized as one of the most important and famous corsican polyphon
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 0xb2951f8671f1d05a57134a6da75b8047dd0734a33c1b7522159b05370e4112fe. 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/6c61f681-f65b-4248-ba4c-41488000e22b.json and https://artists.proofprofile.net/proofs/artist/6c61f681-f65b-4248-ba4c-41488000e22b.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 0x0d6b92690b4cf8b60d9193f003f28ff6f7911b579a64c58ae344dc994f75878d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FRZ368700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca1e62b79dfb24afffca64e57bd541c94798ef1ba574988504df5cd94770dea. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/FR6V80025395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8517b6e759e7c55d34684030bfacbe642df68bc69a4c80b2e3988f1cd9361e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FR6V80025397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6130dfe28c87dd2ab7e199da5d48d044d13ec8f71a2cbae2fc7abf65d5a4a4. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/FR6V80025400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbadcb0b323302150a0cae652ba5fc4f7030bc8039b39d9a310daf2d02a5f661e. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/FR6V80025401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b6b148acfccc26b12d1915e9313f28f5f828405127bc8e7dcde0677cb37f75. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/FR6V80025402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e2da025079a146a27dcffc5c89fc36e8372212afebb8e2e767c22d42d8d9d0. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FR6V80013025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba2b064f2073ae64ea1cc0db0fceec01841f4a15efbff526528d88949327c59. 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/FR6V80013026.
Petru Guelfucci (Les plus grandes chansons corses)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25cac6dbb8fa2d08ded0a45b29d16645ce7f753d018855c89197ff44f8ed2b85. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/DEBL60945912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5e0c52ba1138ea657c5da63fac7b5434b54cc13fcc8a7832112d73536afb19. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRZ360900208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854355b7206880acdec63185267953e2c602516b4a85e0d44058d6019db58e5f. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/FR6V81019678.
Chansons Corses (U lamentu di Cursichella)
Corsican Songs (The Greatest Songs of Corsica)
S'o chjodu l'occhji (Les plus belles chansons corses)
Memoria (Les plus belles chansons corses)
Les plus grands succès de Petru Guelfucci (Les plus belles chansons corses)
Corsica (Les plus belles chansons corses)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001dc296a582f0eb06b1ce9d0d40959dc16476ac630c63b84558b643e3e65ff8. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FR6V82509464.
Corsica - Les plus belles chansons de Petru Guelfucci
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa825f1f6934f5eebb6a4c8de07fdf9b99a522e1153a2810d9bdb738fca119089. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM6N21425728.
A Tribbiera - Les plus belles Chansons Corses de Petru Guelfucci
U Mio Mondu - Les plus belles Chansons Corses de Petru Guelfucci
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005d25e0e3bf446764e348d09a59f94449e43be7c284e72536fd225093e842af. 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/FRZ051500428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ec6214a7fa97f325ecf4a859154507b3e91094ee4afe89a3c3f4dbd0443892. 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/FRZ051500441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8442e9a3f7e15d73e6821838e95dec14017d1f13acb1b6098a3e7d1169c9b6e5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/SR8W12000288.