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 0x31ffb701aa76b1de4eb57981cba1b0b3dce5959f58aa37dfd7172275d7a11e47. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e99310d4-ad82-4582-8805-50f739d1a5d6.json and https://artists.proofprofile.net/proofs/artist/e99310d4-ad82-4582-8805-50f739d1a5d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
St. Louis Blues (arr. for cello quartet)
Cello Quartet Arrangements - Handy, W.C. / Arlen, H. / Mayfield, P. / Ellington, D. / Winner, J.E. / Mackeben, T.
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 0x49689b233654d4643ecd519122794bdecb2c32404aec034394ae7ebc848c1b7b. 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/DEFG20400701.
Hit the Road Jack (arr. for cello quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d872c71ea723f15cf26add4b79816a8f0cd611a6e91c403daaac1130523749. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG20400703.
It Don't Mean a Thing (arr. for cello quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1531246e75ab612dbfd82ce754e92b31634ac0c39cc8ee73c21300f6433657e6. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DEFG20400704.
Little Brown Jug (arr. for cello quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d185f340e77164b6eb3475baca608c4c0b397965b109f7140912513b68e3a1. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG20400705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff147865093649f0af1b1915182be571ddb00a5ce7d1e8d9d1243a34294f9e2. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEFG20400706.