thumb| William Dongois is a French brass player with a focus on the cornett. Life and career Dongois was born in Langres (Champagne-Ardenne). After studying the trumpet at the conservatory in Reims
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 0xc0c72d731ecf5f49182e49958f85eb1cf069d556e3b00444e81b4bc3d0c3d36c. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c70c511e-0086-476a-9315-b25a89a714ed.json and https://artists.proofprofile.net/proofs/artist/c70c511e-0086-476a-9315-b25a89a714ed.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 0x624830f1bcc92293ff2d385cad0f75a36f3c0ded9ad05366bcc7ff3742293070. 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/BER181839502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa017b7c4884067e850c9ecf930f3e065a1c2de9cb85f5375cd83748c6d72058a. 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/BER181839507.
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
Stadtpfeifer, Waits, Ministriles, Piffari. Instrumental Music of the XVI & XVII Centuries
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1469100b4a39663cb4ea7ee574e1c3e764ca69d2998edf6512ff4cf8c306af. 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/DEX990820404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944096ed588609f8b0e4c2f42a3a591dd61fb03a3ec7d489646db1964c166534. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEX990820419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978bc144a3f67d9be612ace864d9727c1c021ca3c668b7618006423034451a71. 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/DEX990820420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab94eabca2e09cb708a5f4d2eda251e7d4f9ebedaef3435ac0ec1a10f326121. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEX990820421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185898fceb31d10fb4525d366f9e51485ff1982aadee50f5f2d240b8e5c6b723. 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/DEX990820401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8068b7b0cbe2d86984091e7d51a2fa5e5b9c86977d95a19f4b787dfd7686f74d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEX990820403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f6e0bee38eab64348b6d023f7498529f8c24f47b3a1c6fa1758bfc2a967f84. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEX990820405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3ae2ff49bee823c272b0bfca603da41f2f1f4f57b3ba0ae8dd2120a038f464. 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/DEX990820406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c450519a430c556514095f652e37412d60c36bd42b63fb898177ebe9e6c473. 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/DEX990820410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2f4eaae87be1975e0cceba912005a93ae9b5190902f8e1393c0d8e9f27ffd7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEX990820415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3e7137922c7d2a50a28c235558076834c9111a29abe3f81cfb03aea00e6a8f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/DEX990820418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c51f438d99206e494fa74091e77ec0f021d3a812639b503e3192b1c51909e52. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/DEX990820422.
Sonatae unarum fidium: Sonata No. 2 (Arr. for Straight Cornett & Organ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817e948fcda0c992381391e3cfe4633edc6c2c2008ad4d9a07fb82639a66d645. 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/DECP61606001.
L'arte dei piffari: Cornetts & Sackbuts in Early Baroque Italy