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 0x6a6aff7e372217b631a62675f73ee843f8f0e49a8eb069e555e90d0e46d9f564. Chain 2 (Bitcoin): anchored in block 953950 (2026-06-16T13:35:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23a92eaa-1683-42d8-9dfb-205c71688183.json and https://artists.proofprofile.net/proofs/artist/23a92eaa-1683-42d8-9dfb-205c71688183.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Giroust: Messe du sacre de Louis XVI: I. Kyrie
A Classical Coronation. Music for a Royal Celebration
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 0x68cd05a841010c34e9b5fe6eb8e5064b30dd79f21968dfa85ed11e0fd4b9c7c5. 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/FRZ208903001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c8ad47ebc7f58971582642069662250aaedbac739c3bc96467de72aef91837. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/FRZ208304101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55a6002b0d3c15cbf4ee25065328528c744f596ac0923a50097e0a24283bd60. 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/FRZ208607122.
Schütz: Historia der Auferstehung Jesu Christi, Op. 3, SWV 50: Introitus. "Die Auferstehung unsers Herren Jesu Christi"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536b67b9326592457941bc6b4c55b3a00fc426fdcf8296c3f66c16b1f5483b62. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRZ208000001.
Schütz: Historia der Auferstehung Jesu Christi, Op. 3, SWV 50: Beschluss. "Gott sei Dank"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12ffdca825004eb8c8b02b638c622d7a43a13b36fcc6b885ab2747d5c726589. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRZ208000010.
Schütz: Historia der Auferstehung Jesu Christi, Op. 3, SWV 50: "Die Weiber aber gingen hinein in das Grab"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1c79755991f7763ed3e729ef38d659cda09a1d89ccebbdb4088440774c9896. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRZ208000004.