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 0xd31faeea3f2d6417c54e0e6d1fb8964690654606274938dfd69b8766da017d1c. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f98a47d-1fe9-4f91-b855-98a5d0fb4307.json and https://artists.proofprofile.net/proofs/artist/9f98a47d-1fe9-4f91-b855-98a5d0fb4307.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Franz Schubert: Winterreise, Op. 89 (Version for Baritone, Choir and Piano)
Die Winterreise, Op. 89: Gute Nacht - Arr. for Baritone, Choir and Piano
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 0x7fa9181cc1428e6858824efb822215168a72cc16119487aa3f1696d857daf7eb. 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/DEX991792301.
Die Winterreise, Op. 89: Auf dem Flusse - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73243eab535113e1d26ba9d6d4d7b8b6e4c605e1a3a20f1487fbe6e3e60e9758. 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/DEX991792307.
Die Winterreise, Op. 89: Irrlicht - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63db0944e9a1b7928ad39d3df0740ce8246ae80d73d98b8d7845f8840d5d4347. 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/DEX991792309.
Die Winterreise, Op. 89: Rast - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cf95e882e214b2fee757711d6c4c1bbeed9a06d9c519a418a103ea226c6754. 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/DEX991792310.
Die Winterreise, Op. 89: Letzte Hoffnung - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d52ee922bf24b104ad455d07c90e95b5ebf402d6e7aa4efd642d693aa49149. 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/DEX991792316.
Die Winterreise, Op. 89: Das Wirtshaus - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2f807c7720fd6832ef749571948d2a28e9b51b7c043d8fa3e9147d47c11ee8. 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/DEX991792321.
Die Winterreise, Op. 89: Die Wetterfahne - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52578f0cb5a05347348f74d44da025dc69b5e8941c9848cf05bd58074a8bdea4. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DEX991792302.
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
Die Winterreise, Op. 89: Gefrorne Tränen - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b71094eb8407ac9fe27ecb727e07894b4b63b93411b45462818df883f45049e. 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/DEX991792303.
Die Winterreise, Op. 89: Erstarrung - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54abf03c56d8ce939b399f4bd5c8e0405f7beba53ca13af14a70ec1eae3972e. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/DEX991792304.
Die Winterreise, Op. 89: Der Lindenbaum - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c84a8fe713a20f0917bbe30a00379565cd2faa1e53e432cae317aa954f1eba. 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/DEX991792305.
Die Winterreise, Op. 89: Wasserflut - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2838306b1fa78dc44dbec6b62931db5632ac131df804dcf4af05e691945011. 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/DEX991792306.
Die Winterreise, Op. 89: Rückblick - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953798e3bf1eadab79b3ccf60c00a2e854bab0ffb64de1459e64987f80518578. 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/DEX991792308.
Die Winterreise, Op. 89: Frühlingstraum - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb219435acdd25ff4950f16bd2b49545c5ab5822668b1ce0e11fc7de8fd3a11a5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEX991792311.
Die Winterreise, Op. 89: Die Post - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ce71a27fef68ee1afb19cd5b94edc2df9b646ca79273b367b1b31123f189f3. 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/DEX991792313.
Die Winterreise, Op. 89: Der greise Kopf - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7656906b58ed07cef019cc479aa80c169283cbf0b993563c23b7e7330f4e11. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/DEX991792314.
Die Winterreise, Op. 89: Die Krähe - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba8bb0291f6e15ac73fb72b288cd38f45a55e2ae421db7de7e14cc305b376e1. 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/DEX991792315.
Die Winterreise, Op. 89: Täuschung - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa2e76711881d0045c1d0d621b6fc4df2aba6cd7c04282ba3dd4a375de47b2b. 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/DEX991792319.
Die Winterreise, Op. 89: Mut - Arr. for Baritone, Choir and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a37fa59e1476a18b75d9f51dab6a62e9aaa485cff276cf28133fc6b2ad8493. 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/DEX991792322.
Jahresbilder: Pictures Through a Year (Choir, Art Songs and Piano Works Arranged for Choir and Chamber Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8027a5d3f793fffb9f0e94ad9ef6634058e43322d9a0307f5d2211606582460e. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DEW741116005.
Hiller: Die Zerstörung Jerusalems, Op. 24
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90befdbfb8364574903e5369a4d3378b2d0903bc2441cbf8b8c6b1e060dacc0b. 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/DEW740821014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f9e4bf540173c61ad350cb6c004503f93220e61b968bc475245df6e9dfd37e. 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/DEW740821016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb6437415499694688dc4b6826372021299832ff6c8ccf4a0b5e5ed9e57e42b. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEW740821019.