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 0xf95b47650c7aea9bb95a8155718ac4bd301fb39f27d48aa24b00d231c6c2e207. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29f6b22a-6a12-48a0-844e-c1dfe5f21031.json and https://artists.proofprofile.net/proofs/artist/29f6b22a-6a12-48a0-844e-c1dfe5f21031.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Johann Sebastian Bach - Prelude in C Major, BWV 846
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 0x5f16270f16e02187e457c9d05ecaa830ed19a692339bc6868faf4f90bc95235c. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70837259 — a six-check JSON result.
Domenico Scarlatti - Sonata in G Major, K. 431 (L. 83)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1603d384d62b626ecd2a30902ce1c10b1beb81a28e6d0a9f2c48c3bda243db4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70837288 — a six-check JSON result.
Joseph Haydn - Sonata No. 10 in C Major, Hob. XVI: 1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3924cd4b8ef6dacc067c84a8c9683f7ecc6e3b39d7fffcd66cc13dcb31642a. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70837305 — a six-check JSON result.
Wolfgang Amadeus Mozart - Sonata No. 15 in C Major, K. 545: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dc58dd07c7be7f6cdcb62f51cd28fc47131a52566d67280846392ff414c03c. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70837535 — a six-check JSON result.
Ludwig Van Beethoven - Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3810c40a2e460744351b2aca8f1d36ac85b3386c3901b72820d325def7ef85af. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70837582 — a six-check JSON result.
Frédéric Chopin - Nocturne No. 20 in C Sharp Minor, Op. Posthumus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5fe0265df1b36d736f25e76d6bee5767e1adffdc0aa45d7c546c2bfd458506. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838003 — a six-check JSON result.
Felix Mendelssohn - Songs Without Words, Op. 30, No. 6 "Venetian Gondola Song"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde58ce5c594f4b8ac15f54e670a3dee65384b18e859eb711e6441dd8098ddb00. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838225 — a six-check JSON result.
Robert Schumann - Scenes from Childhood, Op. 15, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069ca04929bde4ed317865ee4a568acbf4a3625a533663ff53ceb1aba520a5cb. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838250 — a six-check JSON result.
Robert Schumann - Album For The Young, Op. 68, No. 5 "A Little Piece"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ac595ca21dafb68b11c7af74f4339ec8556168bb2392d5ab07d9c2c05360b9. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838272 — a six-check JSON result.
Edvard Grieg - Lyric Pieces, Op. 12, No. 1 "Arietta"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410822e125701fde821a0b8669189d09a2d5ce606c605989246fb30a08ec39a7. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838280 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b620df364926510118eacd0ddbc29f3dc7ee28604880c12e24dda430922a799. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838322 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5fc92d2cd5c4a6ebde59dac8ed5b69d4f9827bf3a7f8e7d1cb8de9df2f37ab. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838379 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a1bc98b8aaf5d28d79208fd007f7cbdfb71bb32b0bdd5535d1cb029997da42. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838385 — a six-check JSON result.
Aram Khachaturian - Pictures of Childhood: Andantino "Ivan's Song"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48c620179de0fb6b19773417eeb6c99c3f1dce68911233c532bcb2557ac67df. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTC70838390 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf490135a90e8a27b702b880dfe644dba8d48208142c3c2a8206542adaa56fa7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFDA1400007 — a six-check JSON result.