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 0x29e30f64dc24fcb40724070a180f7ea6763a8557505ea287a799d4f690b1c06f. Chain 2 (Bitcoin): anchored in block 954038 (2026-06-17T02:57:22Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e69cacd-ffe5-4579-8558-f4e30e487f6a.json and https://artists.proofprofile.net/proofs/artist/3e69cacd-ffe5-4579-8558-f4e30e487f6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Al Sahm al Taéh (After Mozart's "Soave sia il vento" from Così fan tutte, K. 588)
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 0xe0c397a2b531dabaaacef9bc2804e44914546b753fc137c2fb1e6c2322e6ec4f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR34F0500040.
Ya Shady Symphony (After Mozart's Symphony No. 40, K. 550)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be7f89065e96882a78138f89a723be97c865e356272e06f70c27c197f64f615. 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/FR34F0500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be7f89065e96882a78138f89a723be97c865e356272e06f70c27c197f64f615. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR34F0500100.
Le quintette d'Alexandrie (After Mozart's Clarinet Quintet, K. 581)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d34bbc9bef11aace42bcee46a2e9ab500e976ce1e22c2233b8203135933e0c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FR34F0500110.
Layla Misriya (After Mozart's Serenade No. 13, K. 525 "A Little Night Music")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223626dcf146c279d006add218f967b4f9b26917962f736511388187dc05b1a4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FR34F0500150.
La querelle au sérail (After Mozart's "Marten aller Arten" from The Abduction from the Seraglio, K. 384)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686425a1db5f38edca101e6de2db5d872574b60b3e6d020f433790a10ed5b67f. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FR34F0500020.
Classics Reframed - Bach, Vivaldi & Mozart
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c397a2b531dabaaacef9bc2804e44914546b753fc137c2fb1e6c2322e6ec4f. 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/FR34F0500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be7f89065e96882a78138f89a723be97c865e356272e06f70c27c197f64f615. 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/FR34F0500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223626dcf146c279d006add218f967b4f9b26917962f736511388187dc05b1a4. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR34F0500150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686425a1db5f38edca101e6de2db5d872574b60b3e6d020f433790a10ed5b67f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR34F0500020.