The Ring Around Quartet is an Italian vocal quartet active in early music. The Ring Around Quartet was founded in Genoa in 1993 by Vera Marenco and Umberto Bartolini. the members are Vera Marenco (
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 0x26b8f90462e36a734db40fa21b7255a4cfa2fc6e4696dafafa2520811669443a. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1433bbf3-04ee-4119-94b3-5de8815dc695.json and https://artists.proofprofile.net/proofs/artist/1433bbf3-04ee-4119-94b3-5de8815dc695.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Musiche per Van Dyck - Chanson e Madrigali dei secoli XVI e XX
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 0x1dc910ccc4dfef884dd5c5922698dd8a21183808d35a3ad134d689922e359577. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/SEYOK1500872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b81d5ad7d27bc422bf94a0c0620ae43458ec0864ecac3ae0743c1472d12409b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK1500873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79281bd13412fc204c3bde4451e4e60c98f7c161186777b5c33771b09ecf941f. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/SEYOK1500876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751880940b7844d52a6261acc52cfa018ff09736b610ce67ae0aecde919d593a. 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/SEYOK1500880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c49afa078903a876e3cd3808116cc0c4be00c8debb638e42a1c4ebad0511bb8. 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/SEYOK1500881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995427b083d7ffc81f99c5b3539a139472dd9cee38014af5fc0d468bab4c1e1d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK1500886.
À Janequin - La Bataille de Marignan et autres chansons