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 0x405c268af40a62808c2a9b34bc5f29823bd9331a679b6b7c52117d3ad40cd675. 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/13dd1df1-c364-451a-b2e5-3323f34b6075.json and https://artists.proofprofile.net/proofs/artist/13dd1df1-c364-451a-b2e5-3323f34b6075.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Homura (From ''demon Slayer: Mugen Train") [Piano & Cello]
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 0x2d1b2d126186dbdd773d1f963ea8c512f6b79a24e906d6f3c9edf20370c56930. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/TCAFJ2117987 — a six-check JSON result.
Shock (From "Attack on Titans Final Season)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3496443e00ae4158a3e3fcad5006605fce65ab48f7b8808d39050e15befe9298. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/TCAFJ2128256 — a six-check JSON result.
Kaikai Kitan Piano (From "Jujutsu Kaisen)
Identity (From "the Promised Neverland 2")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6052ed221fda54629774aca1c9c1c3e03e4f09a5656e25c900e174a712bb04a2. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/TCAFJ2191224 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32afd25fba679a8fcfe88f38396164ca0ea2de1bffb6e68704d37d269d914bb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAFK2152104 — a six-check JSON result.
Zui Meng Qian Cheng (From "Mo Dao Zu Shi")
Grand Escape (From "Weathering With You")
Is There Still Anything That Love Can Do? (From "Weathering With You")
One Last Kiss (From "Evangelion:3.0+1.0")
Crossing Field (From "Sword Art Online")
Spring Will Come When the Snow Melts Away (From "Fruits Basket")
Yu Ni You Guan (From "Link Click: Shi Guang Dai Li Ren")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261eae71a166a20ba0897a37bdd8110eeec1552586fb41b08dc405b95a7260c3. 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/TCAFQ2153077 — a six-check JSON result.
Shi Guang Jiao Hui Wo De (From "Link Click: Shi Guang Dai Li Ren")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fa9efbdb64e6cfb384c01448c85e03b41bcdf2a0c6f0966ffb92d7f386b46e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAFQ2153027 — a six-check JSON result.
Lost in Paradise (From "Jujutsu Kaisen")
Sakura Kiss (From "Ouran High School Host Club")
Keep in Mind (From "Link Click: Shi Guang Dai Li Ren")
Over Think (From "Link Click: Shi Guang Dai Li Ren")
Dive Back in Time (From "Link Click: Shi Guang Dai Li Ren")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cc68527128a9499d1d507518d07ce23d74b4f6d7ee06dbc8476bc3e09179b2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAFR2178144 — a six-check JSON result.
Isabella's Lullaby (From "the Promised Neverland")
Sora to Utsuro (From "the Case Study of Vanitas")
Huang Ran Na Shi (From "the Daily Life of the Immortal King")
Xian (From "the Daily Life of the Immortal King")
Merry Go Round (From 'my Hero Academia")
Like Flames (From "That Time I Got Reincarnated as a Slime")
Zui Meng Qian Chen (From "Mo Dao Zu Shi")
Koko De Iki Wo Shite (From "Tokyo Revengers")
Yi Hua Yi Jian Instrumental (From 'heaven Official's Blessing")
Zui Meng Qian Chen - Vocal (From "Mo Dao Zu Shi")
Xian - Vocal (From "the Daily Life of the Immortal King")
Akeboshi (From "Demon Slayer Mugen Train Arc")
Yi Hua Yi Jian - Vocal (From "Heaven Official's Blessing)
Shirogane (From "Demon Slayer Mugen Train Arc")
Lian Cheng Ci - Vocal (From "Heaven Official's Blessing")
Arrival (From "the Daily Life of the Immortal King 2")
Huan Rao Xing Jian (From "the Daily Life of the Immortal King 2")
San San Days (From "Sono Bisque Doll Wa Koi Wo Suru")
Be Crazy for Me (From 'ya Boy Kongming")
Chitty Chitty Bang Bang (From "Ya Boy Kongming!")
New Genesis (From “One Piece Film: Red")
Sun Is Coming up (From "Yuru Camp Movie")
Kanatahaluka (From "Suzume No Tojimari")
Rang Feng Gao Su Ni (From "Genshin Impact")
Ru Guo Tu Ran Xiang Qi Wo (From "Genshin Impact")
Kizuna No Kiseki (From "Demon Slayer S3")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830cafb84f5b993cf2d1adafb87f13823f925d63c50912114b0dcb763d3684bb. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGY2313225 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45fe7ea86df7c97523ee7559293091d3ea55d00304952f9161334293116546ee. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/TCAHG2329207 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6230355dbc5bac79b25b5dc809c6311fbb202d9514e56d712148a679fedb12. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAHQ2348060 — a six-check JSON result.