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 0x449ecaaf35862ce30c01d3ca6f706091cbbdb8ba79c95052d8bc0a64e76e4654. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6eb9f4a7-7725-4e9d-852e-39a9a890c699.json and https://artists.proofprofile.net/proofs/artist/6eb9f4a7-7725-4e9d-852e-39a9a890c699.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Festgesang, MWV D4, "Gutenberg-Kantate": No. 2. (adap. W.H. Cummings as Hark! The Herald Angels Sing)
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 0x8a7510cc7be73ea6e448135953122cdd0051a634d732c077f41dc708de5fe0c5. 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/USA370687360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608c2d030a273ea91f76fbd6782a679a2844a00454c5200a1d0cc98838e00805. 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/USA370687362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa33c4288372a090c89742afdcbc6bbc98f252b49405f28d581405abbc2babf. 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/USA370687368.
Carol of the Bells (arr. P.J. Wilhousky)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef8bcf3d076f509d7473a3c295250951170a6c81869ac8fedfa43564b1ec416. 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/USA370687371.
Bring A Torch, Jeannette, Isabella: Bring a Torch, Jeannette, Isabella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d79faf97145f6c2e5ca25229e4a31198ed98ff9d28c63e1dc8fa0aba1686740. 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/USA370687374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc72f8c42f33762b000fa262a17ef5e62944d9f9e13ad1eaab95181785a4debb. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/USA370687355.
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 0x9ffe1760312308d5318d8159eedb5f9e2b0a4d764de5ac72147b4740c3aafe4d. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USA370687356.
Veni Emmanuel (O Come, O Come, Emmanuel) (Sung in English): O Come, O Come, Emmanuel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311934192b502507605132f02d1950a0cf6036448ee819565fa1939c18758a8c. 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/USA370687357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97a85e1c5c3812763ccbf19f8c8e5211eb075354aaee360f70a300c0c929276. 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/USA370687358.
A Boy Was Born, Op. 3: Theme: A boy was Born
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e9b10bea51a486898f45808b6911f97406abf4cac6bb8a55a1d5c9659c6d30. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USA370687359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5fc38c5cffc78ce273bce6db1780114b0f909bf0976268412e0a1ab4aa0b4ef. 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/USA370687361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487c4b6095fc5afbcd1f0e9e54cee87dfcce372e1b300dccf14c1a7d45ffd0e8. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/USA370687363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2676558d6a342d584b0f3d6fe9f191ebf213b332b2656044ef8009bcc0804a9f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USA370687364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8907ac62f1137f13caf90c42becf3214c6bbbd835ffca5f29379916045674c01. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/USA370687365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa3af44f676baa07023014d57c708c1c7b37b8b7ff808ebb30ec01f4753e9d6. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USA370687366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804fac6e476653b6235b9e94f42e2aeec8fa349c95dd0aed09af4849e1cc2577. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/USA370687367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb6047663bcf787cffe69ae101184d7303d29b562f4ab842f35073e062569f1. 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/USA370687369.
Es ist ein Ros' enstprungen (Lo' how a Rose e'er Blooming) (arr. M. Praetorius)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8f4cdc0be796f1cad827592f7375bfa3c1e1d5cb3d65f3587e1e4de82381fc. 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/USA370687370.