A Filetta (, ) is an all-male singing group that performs traditional music from Corsica. It's made up of Corsican singers who try to popularize the traditional Corsican Polyphony singing style. To as
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22723e4c60b33dbc74fb845ca5b423bb9ac4a383865204b223d2fb61e186b050. 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/b4698ad4-8af1-4d3d-9076-29559ed9a4c4.json and https://artists.proofprofile.net/proofs/artist/b4698ad4-8af1-4d3d-9076-29559ed9a4c4.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae2372e53575275f8a0f7098ca2345810e629875ec0bb71a8603421675de3ea. 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/FR77F9200310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49064ebc834d5ed39e110a35b7dbd1d52442c642b02ecbe2428e981a76c2671. 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/FR6V81002997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b0c6a80814f0c9a63dbf0a5e6403fe4840ee8d698e4201c8f3798edbe2a234. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T07:55:44Z), 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/FR6V81003001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30af7f0cef9da08151d3affee2365a7474d32ddd7d3e0c1b6451ba75d533e287. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/FRZ180300040.
A Filetta - Songs and Polyphonies from Corsica (Concert in Canada)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c23953096de590455ccddf14ffe935c6c2c0e398ccc7bb8581cf4df3ca1430. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FR6V80472343.
Songs and polyphonies from Corsica (In concert)
Les plus beaux chants et polyphonies corses (Les plus belles polyphonies corses)
A Filetta - Songs and Polyphony from Corsica
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3623b891f6689f906c2592aedf7a886b2512b6e321fc92ceee0a863a54446ff1. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QM6P41447765.
A Filetta - Chansons et Polyphonies Corses - Chants Liturgiques et Profanes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592a1b68ccdef00fa2b6c3e3d046f4afbe66d6676ee586128d3a257a16eef99e. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-22T01:18:30Z), 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/FR1IZ0600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6250e58cbcd8d640437f0b93db98fad73990af622625992f6e07b3c484116942. 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/ITZ681700412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe042d3e407427c9e0536ebf08839f6db38fd593c6e97ea09604275d78094a571. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITZ681700415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa4fccb5529625e6bc56d28325921dd2edc6b7249448f298b1c2ae46c0185c2. 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/ITZ681700417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b834edf0f7d6dd11d57b2b58f6625bf9ebee1dbad5919fcffc5027c027d7d13. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:21:56Z), 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/ITZ681700410.
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 0x9e78a7c62155a64d6988a10234e121161a080141956bee994ea612fe3ce5a3e8. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ITZ681700411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79463ebbee52c155333a557e7468ca2d81c3ebd8bb09ab0ac5ea112c6c85c581. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/ITZ681700413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92dcb6686b02460d6f6f0a49341515de654e3d3ec8b89f1d3b7703e1cea7f7b9. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITZ681700414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabf1ace476d2b80822a02c8f61088f69350a0d8b1fd17153120003164e6d2ea. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ITZ681700416.
Requiem - Di Corsica Riposu - Requiem Pour Deux Regards
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dc2ec47a5c2b5fc7399ff893518c51263e688b750be400ffe1364850555a09. 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/FRZ082100355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dc2ec47a5c2b5fc7399ff893518c51263e688b750be400ffe1364850555a09. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRZ082100355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a181f37dd4bac9ecd64305e791325012c9641044c44dc60b379037d6e6d2ce. 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/DEB331020301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9272e41e73329d0d20ca80ca0d6975f82bfe80d1a7034f30502a5f84b5d0c42. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEB331020302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c48fdd40a7209e22d04ac8fdc73e62028c79a19775350dea77c7e5dff3af893. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEB331020303.