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 0x50a6467b4a53d81863bc034aa4d1da685ca392f00de0122f60c94b6b3b06dfaa. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39560bfe-4445-4703-ba6c-2a4c28c23ac8.json and https://artists.proofprofile.net/proofs/artist/39560bfe-4445-4703-ba6c-2a4c28c23ac8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Terzetto in C Major, Op. 74, B. 148: III. Scherzo. Vivace - Trio. Poco meno mosso
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 0x35dd92ddd1391823237c6a0532d019b859ea9f18cbfffae85f8cecd7c68e83d0. 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/DEE862200654.
Piano Trio No. 4 in E Minor, Op. 90, B.166, "Dumky": I. Lento maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3655e38d8914a975670f12e9e602b7dcac600bdfc6df35199f68acd9e591374. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/DEE862200656.
Piano Trio No. 4 in E Minor, Op. 90, B.166, "Dumky": II. Poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81271fdc3deb399806b0340b36d5e859b6ed7a46d681cf3d6dc163e6aac2a0ca. 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/DEE862200657.
Piano Trio No. 4 in E Minor, Op. 90, B.166, "Dumky": III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9973712184d65f7dac6412b3c69f7bf5bd860118b75ed7beb6320e3720844fab. 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/DEE862200658.
Piano Trio No. 4 in E Minor, Op. 90, B.166, "Dumky": IV. Andante moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d355b566a54f2c1c315d69825f046ab232720c3ba1d7546a94545118621abbd. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/DEE862200659.
Piano Trio No. 4 in E Minor, Op. 90, B.166, "Dumky": V. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e87eb4d6f709f8ff60cfdbe208ab9d90dfc40b2745b972c78dccfc42ac41c85. 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/DEE862200660.
Piano Trio No. 4 in E Minor, Op. 90, B.166, "Dumky": VI. Lento maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdf3252c59b8a48ffb6a2a3f608cb4e373fc9eff7faaabdb1785fb7a5076108. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DEE862200661.