La Reverdie, stylized as "LaReverdie", is an Italian group performing polyphonic medieval and Renaissance music. Group members Elisabetta de Mircovich - vocal, vielle Claudia Caffagni - vocal, lut
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 0xa65e5ccba1cb725d9dbc7522e83ea3f9001c98d1bd6cd2c74d5ecb2a68f85463. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12a4570a-aac4-4739-8a40-167227abcc30.json and https://artists.proofprofile.net/proofs/artist/12a4570a-aac4-4739-8a40-167227abcc30.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Historia Sancti Eadmundi: De la liturgie dramatique au drame liturgique
Meditation Music: Meditative Music Across Ten Centuries
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 0xeb4e42e03cf5542ed274bc9406d15095317ead8fc27189074af1ff0ad39a9645. 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/ES7141500234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1022262d6cdf2248499fe0d23e2f5aa7702fb183b767b9fb5299e7cc2329bc46. 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/ES7141500238.
Compère: Missa Galeazescha, Music for the Duke of Milan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc28ff082a4514b1e24db2229bf547be414d032949128f70ab6694fa405dfb1. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FR46Y0543604.
Knights, Maids and Miracles: The Spring of Middle Ages
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8992e952e7641dc6b7c4f4c6962742769cfa73ad6a8bd9d54b2da6545c14a7. 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/FR46Y9233605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb414ab533e31c569486908764780d63e8fe34c848af5810c5276fa1db035b33f. 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/FR46Y9233606.
Fuwëles in the Frith (Medieval Harp & Lute)
Dictionary of Medieval & Renaissance Instruments
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86179d58330213b98de52f5dd91a12136cb90e680193964866214d84eed62c0a. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/MX2831000703.
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
Chançonnete / A la cheminée / Veritatem (Medieval Harp, Dulcimer & Lute with Voices)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93a9d191d133ac6fc07c5269e9429cb4293a405658fc03b3d3e8b3ade142fb6. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/MX2831000704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6961220360d95795c323ea1585c4b463776c29758677fda24c9bbb69e2b9af94. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR46Y2048910.
Missa Galeazescha: Ad elevationem. Adoramus te, Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0710f5511f0248553a9265fa2c9e7f31f0fab5adf33fa10a83246a781a453860. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR46Y0543613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23dba73e422f788dbf2d496f353c700755464a97400ba4beb1c4d680aff07cb6. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/FR46Y9233601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2563c159b6d9ec00bf9116b21004c9ebd6e8afd86db313e18495ecc291d7095. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/FR46Y9233602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29aef8fdb1db4d57adedc69d8bbd35eeeff222faed42ce87e14ac2660678ecaf. 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/FR46Y9233607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc949952d25dd3aa53f80ed7898247f9a4b7a89d352cf03e498c188e0f4fa6337. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FR46Y9233609.