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 0x1a9c1b609f0bc1dc2bc8ed38af5a726d0cdeff3f8ef7c97a5a244e41fafe7979. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0826197-e161-4155-8790-50ac12b1eae6.json and https://artists.proofprofile.net/proofs/artist/c0826197-e161-4155-8790-50ac12b1eae6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Music from the Peterhouse Partbooks, Vol. 1
The Lost Music of Canterbury: Music from the Peterhouse Partbooks
Johannes Ockeghem: Complete Songs, Vol. 1
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 0x9ff7c21a5a5ee7e7c36c921d00ace21c94c9964639e363db4b43dc7447917d56. 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/US9Z81901002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b9746faff6099930c616b6083957ae4a34130212c422445a199b89f1d76793. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/US9Z81901001.
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 0x8c564db9fc2608dd677fc4187a7887b181d413dcc30c7f18249fb36ca8713045. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US9Z81901003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34404550508b345b7783545072fe1087cefda11d7c24985d2472b0fcbf387008. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/US9Z81901004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48877c8b7ce54ce06b8f110a0aec32b4f18ecb80cbdad3ff76ff6c0fa0f27e9. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US9Z81901005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7cbbb06cb4bfae7d292324dc95da8c08bb6bf06c720d53942cf1d3343d88b5. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/US9Z81901006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83728a3e67a5d0fc5a1aa479f1a679752fb3ea3b085788c003e3f02c9a4e0272. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US9Z81901007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd005207ccc4961e61cc3c3ec04efce298f0c720632429dd80bc41f2b0fd37557. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US9Z81901008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f72be6abb94a68110fbe5a4a6f483c0971206bb3ca391f88437aa64378bbd3. 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/US9Z81901009.
Music from the Peterhouse Partbooks, Vol. 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54f60add93eae7fc45899b2482f5a68c9d03d892dbcf680a828d712ad33f048. 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/US9Z81700701.
Gaude virgo salutata / Gaude virgo singularis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fd320913aac48a133214ea379ff70fca0ecc8472f8bca27c3a93ba3c8ab9a1. 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/US9Z81500603.
There is no rose of swych vertu [Trinity roll, England, 15th Century]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8d57dd39efb0113d47dd4f72fd98d86e2072c169be37bc0a4cc380d44cd67d. 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/US9Z81500606.
Music from the Peterhouse Partbooks, Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa05d47ac42737e465f854168788fecbe57cd6716d40ad7278b4479295329ae0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US9Z81500501.
Music from the Peterhouse Partbooks, Vol. 3
Music from the Peterhouse Partbooks, Vol. 2
John Taverner: Dum transisset sabbatum (II) - Single
Guillaume de Machaut: Remede de Fortune (Live)
Christmas & New Year’s in 15th-Century France & Burgundy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b9f8caef125f5ab16faa580d7010488c3d928e5f08d66f7ece4d087b85f011. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USYBL1901779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5a380c4df9487443d812e9be38a68432a59dcfe3d8dfb84f4f1e59a7de8336. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USYBL1901775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca7cc4d8d30cbfd852425013cbeb808b604b817e048be71a1e03897dfa1f433. 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/USYBL1901777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9c8198650f50774fe160709add9a50ea2603a28599b661230fda9327675a48. 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/USYBL1901778.
Lessons from Nightingales: Songs of Sufi Mysteries