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 0x56ccb3eae03df7c44d5b3aa4a8be8012c2144018f46055b843a3d4d986403045. Chain 2 (Bitcoin): anchored in block 953860 (2026-06-15T23:55:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/035ab54c-8ef5-4279-af67-1701b885bec9.json and https://artists.proofprofile.net/proofs/artist/035ab54c-8ef5-4279-af67-1701b885bec9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rome Opera House Orchestra & Chorus... Highlights from Verdi's La Traviata
Puccini: Manon Lescaut (Albanese, Bjorling, Perlea) (1954)
Verdi: Don Carlo (Christoff, Filippeschi, Gobbi) (1954)
A Choral Spectacular: The Ultimate Favourite Choirs Collection. Popular, Magical Choral Favourites from 300 Years
Puccini: Madama Butterfly (Los Angeles, Di Stefano, Gobbi) (1954)
Puccini, G.: Suor Angelica (Los Angeles, Barbieri, Rome Opera, Serafin) (1957)
Giacomo Puccini: Madama Butterfly (1957)
Symphony No. 9 in E Minor, Op. 95, B. 178 "From the New World": IV. Allegro con fuoco - From "Asura's Wrath" on "CyberConnect2"
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 0x2c8019266fb1ca151bd08194eeb7baafd864671150ae4d8a8fd71725b194a6e7. 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/FRS181244634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bce9ff1867f2345324260318cb7266a14813a720b36d8fd4e106a7183dd509. 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/USV351403189.
Bulgarian National Radio Symphony Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4e6adada941177291550167bfbbac0019c246ea61adfc59eb1508b6f36962c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USV351403190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a9799c7830dd4e2e723c98bc6477882ff190a61dadf0ca2bb600415f4e6488. 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/USV351403193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a5f53ca4e29fcefc1c3d9dd0c07ba88a5d694bbff757adcd821152d666bb75. 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/USV351403196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3134630fe800ae360281fa004f2c7b6eec9b3c717ebc4e7b36698e63e9e5801b. 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/USV351403217.
La traviata, Act I: Libiamo ne' lieti calici
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d38215b4261141aed477a3863f668dfcd21d48bcc9e82614d0587b4cbbe694. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USV351403188.
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 0x7c585d231e0606cc28ddea705884a6d1baa0e993aae085fa7186916089ed3aa4. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USV291499636.
Cello Suite No. 1 in G Major, BWV 1007: I. Prelude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58710d51cbe02e4be2d7064272c3e31a2bee941d1dd0563cee2450415beddd48. 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/USV291499644.
Puccini: Madama Butterfly (Gigli, Dal Monte) (1939)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ece8719149acfb4e754c238b58d8f0db331d14d73f4de72156d4ef5259fa2c6. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QMFMG1420276.
Verdi: Rigoletto (Bjorling, R. Peters, Merrill) (1956)
Verdi, G.: Simon Boccanegra (Gobbi, Christoff, Los Angeles, Santini) (1957)
The Best Classical Music Collection...Ever!
Verdi: Aida (Milanov, Bjorling, Perlea) (1955)
Verdi: Ballo in Maschera (Un) (Gigli, Caniglia) (1943)
Puccini, G.: Tabarro (Il) (Gobbi, Mas, Prandelli) (1955)