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 0x46708623bf1a383b84fb239d6211e323d078424238fd0650e0aec5d8da9dd034. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e85542c-735e-4561-98cf-35f33d9d0e37.json and https://artists.proofprofile.net/proofs/artist/1e85542c-735e-4561-98cf-35f33d9d0e37.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Spohr: Nonetto In F Major, Op. 31 / Martinu: Nonetto (1959)
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 0xd822e7d0c3a0427f26616334748f03236d8580cbfa3b5a04004b5e7cc0695b34. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEF058802821.
Nonet in F, Op. 31: 2. Scherzo (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc14424493aa5fa9429c95767237fa11666fa5e778d76cb11bcae6876836ee7. 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/DEF058802822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aaa9c764ee996c12bc1caadf18c304e5e13d41d0005a546ad4ace4bdebe03e5. 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/DEF058802823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894b227390c103aa00ab7a73a2db084ad4feee474c5ee052d1d503ac05cccb30. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DEF058802824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9a40761e27becc1f19aeca4b6ec0a2d45491811464cd5527ae42712ff7dc1c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEF058802831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf322f08692234e57871992f8afa6e7e74ccdfe935f19035161c06c190f7e43. 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/DEF058802832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3479651a7f4c55348ba5ed9130bc3666eec9537487b4807323c0e7200799d320. 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/DEF058802833.
Haydn: Die sieben letzten Worte unseres Erlösers am Kreuze - Mozart: Quartett KV 370
Morceau de concerto in G Major, Op. 154: II. Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a52ffdc6aa20f99e831f14b4f797edb7b94b1d703da1f602099efbe3a1798f. 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/DEDS52221210.
Morceau de concerto in G Major, Op. 154: III. Molto allegro quasi presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b388bd88145bebef59855f5d3302af57318d47074349d4a3b6f5a9b14a3352. 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/DEDS52221211.
Wolfgang Amadeus Mozart: Quartet in F Major, Adagio in C Major & Quintet in C Minor
Oboe Sonata, Op. 166: III. Molto Allegro
Concerto for Oboe and Small Orchestra in D major: 2. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0687c42459af1c4c5bda0f03ce2b4bf3cf1db7a180222fe1a5d2d407f6e53a1. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DEF058903272.
Divertimento No. 11 in D Major, K. 251, "Nannerl Septet": III. Andantino
Ich mag keine Klassik, aber das gefällt mir! Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4886cfe049454289664d25bf5327b60038eaf022e12399bcd84804de880e7e2a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USSM10311578.