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 0xc228a20833cf23657ee774009c7bc3438eb1aad10a37f84f42892192a137e80c. 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/c091496c-a5b0-424a-8184-c719abb4cb1f.json and https://artists.proofprofile.net/proofs/artist/c091496c-a5b0-424a-8184-c719abb4cb1f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Greatest Italian Pianists Between the 18th and 20th Century
Sergei Rachmaninoff: Piano Sonata No. 2, Op. 36
Exam Study: Classical Piano Music for Concentration and Studying
Classical Music for Relaxation: Piano Music
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 0x0f1d11a1a638cc9cadf38e7d3080a8861f52d8d8123079ff50c0d60e7a9537b1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITD541701298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ebd9cba16c82cd34b6463b0555902178d7f147fcde5e337616f2f2dd127e9a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD541600726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1f88fe5d3127c22301d6b0454326bd3151048bc1b2bc8649d8d56eab987df5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ITD541501472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343d902bdb0204a32c9cbb2134c9611be682a7fac87e6298443137a06b682131. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD541501471.
Trois Gymnopédies: No. 1, Lent et douloureux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddea145409d9198d0a4ed2205985de8222d174c36b1715a536f13f8f923740a5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD541701334.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": I. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512fd836db4939885973ecf4e9d23984aa9821976ced65d0f5e4c575d32a1a1c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ITD541601229.
Suite bergamasque, L. 75: No. 3, Clair de lune
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d0b8a09cf263cb693be939758d5f374d58115b1b22947b8a7d675cd145feb9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ITD541601235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d0b8a09cf263cb693be939758d5f374d58115b1b22947b8a7d675cd145feb9. 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/ITD541601235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512fd836db4939885973ecf4e9d23984aa9821976ced65d0f5e4c575d32a1a1c. 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/ITD541601229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4699778986cae84154e49dbe7df7365eaeb2c7728b4b26978d7d7776e315eda2. 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/ITD541501152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7cdd3371db6715d3f28f446c5980652725f2ca8d6e7b6de2327c6783e4e6d8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITD541501329.
Préludes, Premier livre, L. 117: No. 10, La cathédrale engloutie. Profondamente calmo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5522a583aa0f87786e0ab182f4d856f037bcf1f9d1bd8f4c96ebfd59675d891b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ITD541601239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36b2ce8caf06dc72febfcac1938a2945f0cd47628cdc099b89c41dd8f2f8946. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITD541501330.
Mazurkas, Op. 68: No. 4 in F Minor, Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c53955abe6e98703fb5a486e06b6673ae234cf9a650b246d3119c70f960885. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ITD541501469.
Bagatelle No. 25 in A Minor, WoO 59 "Für Elise"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26559330a9b44be400b32aff448b1e9af1adbec67b49f6328e0c54a59fd82a32. 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/ITD541601233.
Lieder ohne Worte, Op. 62: No. 1 in G Major, Andante espressivo, MWV U185 - Live Recording
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1623a8a06c4564cfd8e561044fb03f6365f3d275a0a6e7f56d61496c5187f3a. 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/ITD541600130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53fcfefcf874acc730f059607627ca2b1e6839932cd529173937bad179818295. 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/ITD541600733.
Lieder ohne Worte, Op. 30: No. 6, Venetianisches Gondellied, MWV U110
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa7c51b2fe0f3446f77764731a771675c9c01816129ed4936cd12c7be79e9b2. 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/ITD541400290.
Lieder ohne Worte, Op. 38: No. 6, Duetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ec1d982781965a17c3218d814b6c451eb1b9cefb8706b6920c9964bb54bfb6. 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/ITD541400292.
Mozart, Beethoven, Chopin - The Masters of Classical Music
Lyric Pieces, Op. 38: No. 1, Cradle Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c462f09170b7819fcffe4fe4e714287620a8d5900e6b0d77ba1c3c36531f04c. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD541600730.