Tomoharu Ushida (Japanese: 牛田智大) (born Fukushima, Japan, October 16, 1999) is a Japanese pianist. Early life and education Ushida was born in Fukushima Prefecture. He moved to Shanghai with his fam
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22c0bd733259b2fe83bb4d388f14a68c5bc0c57973e67a670f7ec4ceb07ea95. 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/f38e80a9-7320-4a59-9188-f14f0e6817af.json and https://artists.proofprofile.net/proofs/artist/f38e80a9-7320-4a59-9188-f14f0e6817af.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
パリの散歩道～ピアノ・オン・ジ・アイス
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0deecda444118ca9d97464a8ecd676f6a6eab0ae18aeaa4d49b327ce5e69bb41. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/JPPO01403963.
トロイメライ～ロマンティック・ピアノ名曲集
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a33ac9643072c88a837191db109d1bd93618991588796987313d9603f44551. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/JPPO01406648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bab0c2d3accb78bf1a26da89c5ff0988e62ce87a282bf823509c299d87723f2. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:35:12Z), 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/JPPO01200568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7bc8625bd6bfdba8ca79c9d76a45367c7b7340343edccaa67cba42fd615a9f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/JPPO01337615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52ef4a157fcdbc12ddb3192c656a4d9b787a89d6a1b2cc0007dc6af9e3d9763. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/JPPO01406654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688ce7d1378f81e46a1f8b28e6e83ad91b0eafa62c5dcc679e902bcba18bcc24. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/JPPO02201153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40eb76310b471bda04b989ae728de8af3cedbefdbe07aef152a6493fc46b278f. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/JPPO02201150.
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