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 0x72422dfc38d92b0360508cbf32455f0d16fbaf70a02d6263fa78dcf52178ee48. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c13036d4-cd48-45b4-8bf3-fe6ad273a28d.json and https://artists.proofprofile.net/proofs/artist/c13036d4-cd48-45b4-8bf3-fe6ad273a28d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Eccles / Misek / Hindemith / Jentzsch / Montag: Double Bass Sonatas
Gardonyi: Suite No. 1 in Old Style / Maros: Albumblatter / Kazacsay: Divertimento / Farkas: 4 Pezzi
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 0x69ed345471aa42a53a62b5ad49edf96a67f1169dd8fc47d18a2131f86eed7304. 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/HUA253175801.
Double Bass Sonata: II. Courante: Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb1daaed697471f26a8f14c97a3cf51efb03edb586a4246b2acafad4f503592. 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/HUA253175802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6f6278f1b9eece51670f76bf80c3343bb65b18e43217e0f2c012f4649326d3. 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/HUA253175803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c97c201196760bb4b504e4d77b85d95696ad241a082e4b20ab7b43418b6446. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/HUA253175804.
Double Bass Sonata in A Major, Op. 5: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa838fed8ee3b000fc0796116b30f0612e96a8bafcb792e531a3728cf0d726f. 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/HUA253175805.
Double Bass Sonata in A Major, Op. 5: II. Andante religioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5649efb383368efee125274006ae15b07814517a07441f31156e28e99a20dab. 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/HUA253175806.
Double Bass Sonata in A Major, Op. 5: III. Finale: Rondo: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e6cd3e98384b1e2d8a774fec2ab3195f2df594090a82d25375211ff7f6b5d4. 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/HUA253175807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a61c23bc75c733d38c699891bfd6a6584a8e4789d6b408c3ddc3dc525fa568. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/HUA253175808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3bb72047829dc9da3fc32676dc363eb2efed7eb3f863e393d170568b323517. 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/HUA253175809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5652f0f4da694e9da82b467d70e7df4c70543f4dbcf8e6685c3b522a3ab654. 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/HUA253175810.
Double Bass Sonata in E Minor: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd81c28ed5761dd6556311bdd473c367f1afe4ba77cf536e6d5c1b6b887ca674. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/HUA253175814.