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 0xdb81c9146c865e4068e542fbf6e306658fc5c505c8195afcb3a6c94eb2ac8532. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23da720c-f660-404e-91d3-2bad9dcb0d85.json and https://artists.proofprofile.net/proofs/artist/23da720c-f660-404e-91d3-2bad9dcb0d85.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
ひろみち&たにぞうの みんなの運動会!
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 0xb08447a7949c2902d2ef2d300dff6354a9b39ed5a6a2c6e49ec615654f2c5b5a. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI00701056 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34954a609e825110bb19b08ec9a69a660ee5459f0772f3b8e3c87ad3f5d43e23. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/JPKI00701705 — a six-check JSON result.
ひろみち&たにぞうの 踊る大運動会!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36188bc9d59ecaa2fe1ef1fd857662c06a9abcf8ad74b924bd2eedc075b2ff8. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI00810614 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d30de3d29698729a789beb1fe00384f47413bac535213ac206addddb0afe55f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/JPKI00810618 — a six-check JSON result.
ひろみち&たにぞうの 運動会だよ全員集合!
ひろみち&たにぞうの 運動会だよ、ドーンといってみよう!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b2be31ca04886bfcfaba947e8a4e95f8a9a213abc514c155790adfd4345e88. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI01110827 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c904f02be9d817b9c0285843bd9aaa41aa6d24733463a6b89b7be3dde260994. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPKI01110834 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb950efb2a1c754f6c095af9cbec6cf5b6f429e7e085339deddcb9bb2e7e9097. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI01110837 — a six-check JSON result.
ひろみち&たにぞうの やっぱおやこでSHOW!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9205f3663601c16fc276bd9a63124e3cc2b4f02e7a65adbf75ce45764559309a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/JPKI01112737 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ddddb1baef228a886ee2981e71c5aa31e5f84980be354e27423176e2f54c8b. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/JPKI01010952 — a six-check JSON result.
おたまじゃくしのたいそう 1･2!～ひろみち&たにぞう 0･1･2さい うんどう会&はっぴょう会～
ひろみち&たにぞうの 運動会カーニバル!
ひろみち&たにぞうの 僕らの運動会!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f39dc4a513ed08bfbe90efc486a10a1927103a76136c97c474d4c971e3f6a1. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/JPKI01812094 — a six-check JSON result.
ひろみち&たにぞうの天晴(あっぱ)れ運動会!
ひろみち&たにぞうの みんなの みんなによる みんなのための運動会!～リクエスト・ベストセレクション～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1422aceb26ef677502aec90cc5fa57c0a14fc1127ad68cd513d0313f8a8d68. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI01010956 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efd75f0785f047541d5c3c240b91eb86ca9f2c2980c81d747900127eef8a4d7. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI01610949 — a six-check JSON result.
ひろみち&たにぞうの 元気うた!心うた!
ひろみち&たにぞうの運動会やるってよ!
ひろみち&たにぞうの 帰ってきた運動会!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3584a6b237b91366942340e78d9bdad52dd99012c0fb56eace7473ac143d11. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/JPKI02215828 — a six-check JSON result.
ぎゅっぎゅっぎゅ～! ひろみち&たにぞう 0・1・2さい うんどう会&はっぴょう会
ひろみち&たにぞうの運動会に乾杯!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db3a32ef0112a2d180d978cf82cd2667398b00042d6542bea53d522be413bb7. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/JPKI02410049 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64704f6c9406c7e4d58a5717f934767539c33895d6cb92979acab3571e99a155. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/JPKI02410048 — a six-check JSON result.
ひろみち&たにぞうの ミラクル運動会!