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 0x68de2947be88914248d01138aa851b31d7b5386180692ae1878d9f1129fab7d6. 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/9adbc57f-f426-4b2a-a2f1-218117ac985c.json and https://artists.proofprofile.net/proofs/artist/9adbc57f-f426-4b2a-a2f1-218117ac985c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
The Ultimate Price (From "Violet Evergarden")
Isabella's Lullaby (From "The Promised Neverland")
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 0x0d092a89fcdf99d5645d213e384e1e1b9479157892835995d7d5e3626dfc1753. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZGWX2143540 — a six-check JSON result.
Homura (From "Demon Slayer") [Piano and Cello Version]
Literature (From "Wandering Witch: The Journey of Elaina")
Kamado Tanjirou no Uta (From "Demon Slayer")
Ashes on the Fire (From "Attack on Titan")
Inochi no Namae (From "Spirited Away") [Erhu Cover]
Moonlike Smile (From "Genshin Impact") - Orchestral Cover
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18f44212b952bfb1c52aa534dd6d15b0cf9b4fcca63f3c5e0b13aad09bd7a82. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZGWX2246052 — a six-check JSON result.
Her Legacy: Theme of Kamisato Ayaka (From "Genshin Impact") [Kalimba Cover]
Genshin Kalimbandellon - Blue Dream Along the Streets of Elegance
Everything's Alright (From "To The Moon") [Orchestral Cover]
Promise of the World (From "Howl's Moving Castle")
If I Could be a Constellation (Kita Ballade)
Kirameki (From "Your Lie in April") [Orchestral cover]
Kamado Tanjirou no Uta (From "Demon Slayer") - Piano ver.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c16e658c7b01dce570bc36bd58fd2d5bb2f2b214c8d16bfd0e7912b08a654f. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPJ32259759 — a six-check JSON result.
Merry-Go-Round of Life (Two Pianos ver.)
Anytime Anywhere (From "Frieren: Beyond Journey's End") [Orchestral ver.]
Brave (From "Frieren: Beyond Journey's End") [Piano ver.]
Little Steps (From "SPY x FAMILY") [Orchestral Ballade Version]
Everyday World (From "My Teen Romantic Comedy SNAFU") - Piano ver.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65855617411be3aa94f2de7604355782668df9a19122405203f9c70d998b4820. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPJ32321988 — a six-check JSON result.
La vaguelette (From "Genshin Impact") [Two Pianos ver.]
Sunny (From "Frieren: Beyond Journey's End") [Orchestral ver.]
Sunny (From "Frieren: Beyond Journey's End") - Orchestral ver.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa91be276ae390c0f60ea08c8d111ce82e90f27c79d0175233934897429ce6c2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPJ32329811 — a six-check JSON result.
Memories of Teyvat: As We Wait for a Windier Day
Moonlike Smile (From "Genshin Impact") - Piano ver.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054e0ae909bc8e4ec90039a1b882e2bdaa5d3c1e518d201b8f186f6ff7825944. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPJ32333189 — a six-check JSON result.
Memories of Teyvat: An Ode to Yonder City
Memories of Teyvat: Under the Sakura Tree