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 0xbab956b6031f7ba7d5769143914a58963dcbc48f0cc26a0330c7a65f39fb0d0f. Chain 2 (Bitcoin): anchored in block 953943 (2026-06-16T11:59:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21448de2-f002-4b7b-846c-6095f184c543.json and https://artists.proofprofile.net/proofs/artist/21448de2-f002-4b7b-846c-6095f184c543.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sirens & Soldiers. Songs without Words from the Italian Seicento
Trattenimenti per camera, Op. 22: No. 9, Ballo delle Ombre
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 0xef05a033ac68bf71b58a6a7e99c294dc21a9f4c30b9bf42490565df599fb7a58. 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/FR46Y2356515.
Il secondo libro delle canzoni da suonare, Op. 9: No. 11, Canzon Undecima detta "La Fontana"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e94b1470b98e8b398ea9cebaad074682fb34041c9fd2e71c9cd526fe752b06. 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/FR46Y2356501.
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
Sonate, correnti et arie, Op. 4: No. 13, Aria Decima Terza sopra "Questa bella sirena"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169f0ecb2ed9ad089075d81d5d66ed40f8c09efa037b584864f30b65ef8014e9. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/FR46Y2356511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d602685a0d3d44d12708e2f5fba66e212fc3be434851754b3e3f4e5b22bd651. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/FR46Y2356516.
Johney Cock thy Beaver: a Scotch Tune to a Ground
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc814e26cf107b6c9f0452db7b4c2787bce1b1c97bc272e62bc34fdcda987cf9. 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/FR46Y2152304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132d454d76cfe7ccb0b2265c786cad52bf02e536d576ee399d1fdde2e7bff940. 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/FR46Y2152303.
Sonate da sonarsi con varij stromenti, Op. 2: Sonata decimaquarta à dodeci