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 0x4d361f2a85df127a5bb39e2a45743cd43b731fa535c65099c10e1d311b572d0f. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b9fe13d-ed6c-4200-b410-b81ed23646aa.json and https://artists.proofprofile.net/proofs/artist/6b9fe13d-ed6c-4200-b410-b81ed23646aa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rigoletto / Act 1: Ch'io gli parli (Monterone, Duca, Borsa, Rigoletto, Marullo, Ceprano, Coro)
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 0x7dba5df811053bbb8b3b13018e4c96d50a53c20209bc4ba78d571914ff28dfe6. 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/DEF056431024.
Rigoletto / Act 2: Scena con coro: "Duca,duca!"/"Ebben?" (Tutti, Duca)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa90c318d1f6ee72ee0904e093e76381192b4c092a848ecf0df1d5e1b12ce68. 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/DEF056431042.
Rigoletto / Act 2: Scena e Duetto: "Mio padre!" / "Dio! Mia Gilda!" (Gilda, Rigoletto, Borsa, Marullo, Ceprano, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa8e39fea02d1bfc3a96b2d640beaad91525105743499f36914d5ada96e3e3e. 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/DEF056431006.
Rigoletto / Act 1: "Questa o quella" - "Partite? ... Crudele" - "In testa che avete, Signor di Ceprano?" - "Gran nuova! Gran nuova!" - "Ah, più di Ceprano"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209f05e1da1a180231e943848361b4cb3110c068d8e91e5a1dd54cc04f06115c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEF056431023.
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
Rigoletto / Act 1: Zitti, zitti, muoviamo a vendetta (Borsa, Marullo, Ceprano, Gilda, Rigoletto, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb7cd5b9d95ffd5eb895320a60d97c06875fc6e236a8c913e6d361c9da941b6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEF056431040.
Rigoletto / Act 2: Possente amor mi chiama (Duca, Borsa, Marullo, Ceprano, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4f3f55136005be7b0e5c7248816b11339bd5b10bd8baf4c0dd2fdef9bd3418. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEF056431043.
Rigoletto / Act 2: Scena ed Coro: "Povero Rigoletto!" (Marullo, Rigoletto, Borsa, Ceprano, Paggio, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65d9275a18ef8845528f9831516e03d083b5e9423535e929415a152d4b69b49. 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/DEF056431020.
Il trovatore, Act I: All'erta! all'erta! - Live at Großes Festspielhaus, Salzburg, 1962
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9b1607ae91c3ce4f36e640c7c6a23711fda58960cecb89a09f720cd810c47a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEF056231501.