Fatima-Zahra Hafdi (Arabic: فاطمة الزهراء حافظي; born 25 August 1987), known professionally as La Zarra (), is a Canadian singer based in France. She represented France in the Eurovision Song Contest
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 0x4529b9811467b0bb32af03cfb76077c51660637007c369d75a8accbeb253839e. 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/48cc3cf5-8218-4be2-ae33-d9d2a2c989a4.json and https://artists.proofprofile.net/proofs/artist/48cc3cf5-8218-4be2-ae33-d9d2a2c989a4.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 0x921146a40cd21d6386f138bc942eb31768ed5d4858a4207e672a0285cbf80c8a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CAUM72100454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02aae1d5da2331c2764a9056a8f93f0497a57d217d9e44d84e78626924e4dcec. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CAUM72100490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd05f3f0c15064f0cd8851a8e95520c0f006db15e1cd1dad5595ff88b627843. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CAUM72100491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb57c6b42181b1f448b274340f346f6f07c7fbcdaee73612ce3b49a5c82bf52f. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CAUM72100455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986bfd163a6f4aebc400da366d2179dc9ea87974c3407e3e69f1471c7bc76a50. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CAUM72100492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3322d96427e40eb4efa7b3b6f4a9760f7b20dbe1251a8d43656198b489517029. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CAUM72100451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ade4f018316cbfc15073b541b1d616e404c99fb3828933767350e4badff3d5e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CAUM72100452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fff4ae0db08c486b8a1d06ec60b4523d10e8be006fab5d86e48724524e78fc3. 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/CAUM72100372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921146a40cd21d6386f138bc942eb31768ed5d4858a4207e672a0285cbf80c8a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/CAUM72100454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb753ea3aec6154308e2b1d0b7f5325f0ef39fc89aac1f101f5f54abdd87265f4. 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/CAUM72100453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02aae1d5da2331c2764a9056a8f93f0497a57d217d9e44d84e78626924e4dcec. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/CAUM72100490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd05f3f0c15064f0cd8851a8e95520c0f006db15e1cd1dad5595ff88b627843. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/CAUM72100491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d18dd733f0eb91ce7fb5ebf66b81ce0c28979fbaca72dfeab1cce9dfb0133c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CAUM72100457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb57c6b42181b1f448b274340f346f6f07c7fbcdaee73612ce3b49a5c82bf52f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CAUM72100455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986bfd163a6f4aebc400da366d2179dc9ea87974c3407e3e69f1471c7bc76a50. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T04:59:39Z), 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/CAUM72100492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91accfd965ff878da55dc026695a16c0b80547808d4975f377074dc7b80bcca8. 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/FRUV72300177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db344127b833e18ebf98e927d6d3da29e2298ede9202b0dff07588ab9758c66. 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/FRDZ22200150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db344127b833e18ebf98e927d6d3da29e2298ede9202b0dff07588ab9758c66. 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/FRDZ22200150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c89c5e3a253cfd30a65bc00a351ec6d8acb682148b7f94f517d0af49ddb0d45. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DGA082356282.
Évidemment - Eurovision 2023 - France / Karaoke
Eurovision Song Contest Liverpool 2023 (Karaoke Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b32fd00332c5086eee57c7535b3cdf57dbec15a1db7e2a62eb88db3dc768cde. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DK2DY2300075.