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 0x17962a2cbad8ca12697b64c9c43e5f49b12b57f0bfb99dce1f291a652a804040. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b5a5004-8260-4371-aeb5-1e04323209c1.json and https://artists.proofprofile.net/proofs/artist/8b5a5004-8260-4371-aeb5-1e04323209c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kakai Kitan (piano version) - From "Jujutsu Kaisen"
A Cruel Angel's Thesis (piano version) - From "Evangelion"
Tokyo Revengers Openings (Piano Version)
Ranking of Kings Openings (Piano Version)
Kick Back (From "Chainsaw Man") [Piano Version]
Gradation (From "My Love Story with Yamada-kun at Lv999") [Piano Version]
Monster (From "Beastars") - piano version
Setsuko and Seita (From "Grave of the Fireflies") [Piano Version]
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 0x479e4bf673c01e5da1863b8be3741f6ffba2d282328d63ee457c2c2e76ac3b3c. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZPLR2325246.
Merry-Go-Round of Life (From "Howl's Moving Castle") - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba8813504dd4e67232d5f0db7af17d10d0e39d9d3901aa4ee2897bca5fa4bac. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZPLR2325240.
Princess Mononoke Theme Song (From "Princess Mononoke") - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdb72e6ecb880433ace98c8d11d1392681dda969eb524a35a9275d1dce7a9df. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZPLR2325243.
Ponyo on the Cliff by the Sea (From "Ponyo on the Cliff by the Sea") - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49798d9fe570ae8b38718d10e1ff7f59f60c0a421d265af20a02d8dc283de9d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZPLR2325244.
The Girl Who Fell from the Sky (From "Laputa: Castle in the Sky") - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f21ec6b1d5774689f73117996216e6701f61f5f180f9d692f28e5fe191221b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZPLR2325245.
Fine on the Outside (From "When Marnie Was There") - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133783b674a757f918239239d267bf4daab3fa33611034698f74c14976119be9. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZPLR2325247.
Arrietty's Song (From "The Secret World of Arrietty") - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db8804e77342c6b0f7695dbd08874e52f7e80d991ab8d2afcc57745f725bcb6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:50:50Z), 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/QZPLR2325248.
The Latin Quarter (From "From Up on Poppy Hill") - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e66ce872e79b2e0bd39fb8b1d5cdc5b4dcceec5a9576733edb05fdfed49594. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPLR2325249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117342814fa2b8ff8844cf2c869dcc63cb93f5aceebad738c6278bc1b434436e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:54:57Z), 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/QZTB22331009.
Ao No Sumika (From "Jujutsu Kaisen") - Piano Version
Mixed Nuts (From "Spy Family") [Piano Version]