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 0xebbe1d2419f0aa4b1a97cc3561d2da2ffd971a328552c797743dacca14f60d89. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c46eb14-9659-4dc3-96e1-74db36f9e6b2.json and https://artists.proofprofile.net/proofs/artist/5c46eb14-9659-4dc3-96e1-74db36f9e6b2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
8 Humoresques, Op. 101, B. 187: No. 7. Poco lento e grazioso in G-Flat Major
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 0x614e735b272968d3ae591bcb506088b43959adc1ee1c77fb48e143e2ebf14d67. 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/USB8U1600701.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27, No. 2, "Moonlight": I. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1b0ec29d15ff2f20cf157571e8e1eaf00dc772da9969c6ba0f66e748a660f7. 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/USB8U1600704.
12 Variations on Ah, vous dirai-je, maman, K. 265
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5d19ba9e8cde4269be96faf2983e190d51f1fd84ab39d75e8a08242fe2dd98. 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/USB8U1600706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199d40d29cf23e12a9718e9951e3e393a2be663a3156c64c72d1f3fe518e8067. 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/USB8U1600708.
The Well-Tempered Clavier, Book 1, BWV 846-869: No. 1 in C Major, BWV 846
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fc8e37580406fc407960661433323c9fe8740c441919e45b74d2aee54766f9. 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/USB8U1600709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbfcc216c790c653246ac5e6ac91e3cfc516e85010174705977b2b86c989ffb. 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/USB8U1600710.
Suite bergamasque, L. 75: Suite Bergamasque: III. Clair de lune
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f83bfaa6c5316de171df4e896474377d62dd0152c93fb70570c4c5ceb2fd35. 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/USB8U1600711.
Lieder ohne Worte (Songs without Words), Book 1, Op. 19: No. 1 in E Major, Op. 19, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b59835bfb8f09d90b62b1b684e3fa1b87940380dcacc1468ebee2322469d73. 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/USB8U1600718.
Piano Sonata No. 11 in A Major, K. 331: I. Tema: Andante grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095bdd56a1b025a485be4a8b34aa0448d5503cef9c7245eeebd8e00cc6b44b48. 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/USB8U1600735.
Steven Mayer Piano, Performs Art Tatum Note for Note Solos
Gottschalk: A Night in the Tropics – Solo Piano Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d6c16183f302d204e1c2538f6756890080805eb717d3486c1abd77ebf95d64. 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/HKI191425004.
Liszt Complete Piano Music, Vol. 33: Wagner & Weber Transcriptions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafbb0a28492fc9aedaadad589abcfe4efc97e62050d6d42acd390c26c4aab813. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKI190433501.
Ives: Piano Sonata No. 2 / The Celestial Railroad
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea439b4bcbd402616faeaeaaa1edfd0e59fdb116f31ccfbfe70ba5c6345b8be8. 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/GBUM70903328.