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 0x2d9c457c6ccb0042b821819ae985d4f941ab46662e48dd320a43654d305d10e9. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d92c77f-e7d6-425c-98df-76894c5619d5.json and https://artists.proofprofile.net/proofs/artist/9d92c77f-e7d6-425c-98df-76894c5619d5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piazzolla / Orch. Gupta: Concierto del Ángel: III. La muerte del Ángel
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 0xb325b494575447ac6b1321a971a6f085693a9521fb11f381cf21a1f75f72b08e. 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/DEA809813603.
Piazzolla / Transcr. Gupta: Concierto del Ángel: I. Introducción al Ángel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f570ed60264d77f73daaefdb3d8a594ac41fbcf24a3a36eb80bc4a198debcff. 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/DEA809813601.
Piazzolla / Orch. Gupta: Concierto del Ángel: II. Milonga del Ángel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f871b62ff923b6710d41af84d751a0093f4870f18dccc22888b1768cf50090. 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/DEA809813602.
Piazzolla / Transcr. Gupta: Concierto del Ángel: IV. Resurrección del Angel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522b566b6a825e4280788e05a2ffa7869c92336175176b0283332ed981169330. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEA809813604.
Spohr: Nonetto In F Major, Op. 31 / Martinu: Nonetto (1959)
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.