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 0x5f6a7204b7dec6619a368691dcfe9bcd04a772266d366d1d70f9f37431b0510e. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f8efd92-9a73-4f0d-8b96-dcb6e996dc96.json and https://artists.proofprofile.net/proofs/artist/4f8efd92-9a73-4f0d-8b96-dcb6e996dc96.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Symphony No. 6 in D Major, Hob. I:6 "Le matin": I. Adagio – Allegro
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 0x77669766ac30fb3aa733828a66cebaac15057001e05b436e31369d92279893d1. 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/GBF077210701.
Symphony No. 6 in D Major, Hob. I:6 "Le matin": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acb179ec977b70a91aee6778e082c5bfeb899a26bb75efb4614370861bb009d. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBF077210702.
Symphony No. 6 in D Major, Hob. I:6 "Le matin": III. Menuetto – Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa770b4ab465e5434b4e756617702d90530faba15ccb71555746c69d5936e49c0. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBF077210703.
Symphony No. 6 in D Major, Hob. I:6 "Le matin": IV. Finale. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147c49564935595b9130d01aca33c81ea32eb03dd3a52240108c6b65602ccf83. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077210704.
Symphony No. 7 in C Major, Hob. I:7 "Le midi": I. Adagio – Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41eb1b8e9d810718046cdfb888982ead5781406f17ccc352333313d01af53c65. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBF077210711.
Symphony No. 7 in C Major, Hob. I:7 "Le midi": II. Recit. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078a844674eb9e049ed103a53d7986107a4ebbf14851c6972d006605bba4a33d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBF077210712.
Symphony No. 7 in C Major, Hob. I:7 "Le midi": III. Menuetto – Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317a1ea922cf81e36c40882aa3da9f00c9deee6ee4c73bdd8deb19a8b490306b. 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/GBF077210713.
Symphony No. 7 in C Major, Hob. I:7 "Le midi": IV. Finale. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec184d625958e3e1bb591a77deb727eeb327cd612aa14b6f18f129c2701d6cc2. 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/GBF077210714.
Symphony No. 8 in G Major, Hob. I:8 "Le soir": I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5325ea3c852bf309c24013db29330256478ca0e8b4df995494dabad8785d49fc. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBF077210721.
Symphony No. 8 in G Major, Hob. I:8 "Le soir": II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7240e7d5b9ecfc39a300e9e165a0d9afb8afadf01c5fcb8d43dc08743be5fe. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBF077210722.
Symphony No. 8 in G Major, Hob. I:8 "Le soir": III. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab580d70ab4404b94800dbc3c9977fb3eeeef547cb59efdab82f462b6a04f36. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBF077210723.
Symphony No. 8 in G Major, Hob. I:8 "Le soir": IV. La Tempesta. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610756e2fe52d9c7bbd44b0f1bf0e19ff956f977ade99ef25ad3ba23f383739d. 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/GBF077210724.